Program Schedule

Poster Presentations

Session Introduction

Anna Boczkowska
1Warsaw University of Technology, Faculty of Materials Science and Engineering, Poland
Title: Characterization of Carbon Nanotubes Doped Veils Used for the Improvement of CFRP Electrical Conductivity

Biography: Anna Boczkowska is professor at the Faculty of Materials Science and Engineering, Warsaw University of Technology in Poland. She graduated from the same faculty in 1989 and received her PhD degree in 2000 and D.Sc degree in 2011. Her scientific experience is related to the processing and structure of polymer matrix composites, nanocomposites and smart materials. She has an industrial background of over 20 years in the development and application of polymers and composites. She is member of many international organizations ( e.g. ACS, AAAS, SPIE) and author of numerous scientific publications, books and patents.

Abstract: Lightweight non-metallic components made of Carbon Fibre Reinforced Polymers (CFRP) are nowadays commonly used in many applications due to their high strength and high-performance accompanied with low weight. However, they suffer from not enough electrical conductivity for lightning strike protection, electro-static discharge or electromagnetic interference shielding. Since the improvement of electrical and mechanical properties owing to incorporation of CNTs within the polymer matrix was noticed, a lot of efforts are focus on creation the materials where these features could be commonly used. The implementation of CNTs into CFRP can be realized by: i) direct grafting of nanofillers on carbon fabrics, ii) mixing with neat epoxy resin iii) application of intermediate products e.g. buckypapers, iv) deposition of nanofillers on commercial prepregs [1-3]. In our studies thermoplastic non-woven veils doped with CNTs were fabricated, characterised and used for the enhancement of CFRP electrical conductivity. Two routes of obtaining doped veils were investigated: i) by extrusion of fibres and pressing, ii) by melt-blown process. They are innovative lightweight intermediate materials which act as a carrier allowing for the introduction of CNTs into CFRP in an easy and non-hazardous way. They are easy in handling and can be applied in standard composite manufacturing processes. In order to investigate the effect of CNT-doped veils on the electrical, mechanical and thermal properties of CFRP, laminates interleaved with veils were made using commercial epoxy-carbon prepreg using an out of autoclave method. The microstructure of veils as well as CFRP was also studied.


Hsun-Feng Hsu
National Chung Hsing University, Taiwan
Title: Fabrication of Rectification Nanosensors by Direct Current Electric Field Induced Assembly of ZnO Nanowires

Biography: Hsun-Feng Hsu has completed his PhD at the age of 16 years from National Tsing Hua University, Taiwan and postdoctoral studies from National Tsing Hua University of Materials Science and Engneering. She is Associate Professor, Department of Materals Science and Engineering, National Chung Hsing University, Taiwan. She has published more than 23 papers in reputed journals.

Abstract: Fabrication of Rectification Nanosensors by Direct Current Electric Field Induced Assembly of ZnO Nanowires: We demonstrate the fabrication and characterization of ZnO nanowire-based devices in metal-nanowire-metal configuration using direct current dielectrophoresis alignment across Au electrodes. The current-voltage characteristics of the devices were found rectifying, and their direction of rectification could be determined by DC voltage applied direction due to the asymmetric Joule heating occurring in the dielectrophoresis alignment process. Because Au atoms of the electrode diffuse into ZnO nanowire when Joule heating occurs, the ZnO nanowire on the high-temperature anode side with higher Au concentration has larger Schottky barrier height. For detecting ultra violet light, when the rectifying device operated in the reverse-biased mode, the high speed and sensitivity of photoresponse was achieved due to the efficient electron-hole separation by built-in electric field in the depletion region at the junction interface. For gas sensing, as expose the device to CO Schottky barrier high at the ZnO/Au interface decreased due to O desorbing from the interface. The current increased obviously and thus high sensitivity was achieved.


Wan-Chun Chuang
National Sun Yat-sen University , Taiwan,
Title: Flexible sensor module applied in sit up training exercises

Biography: Dr. W. C. Chuang received her engineering degree of master and doctor in 2007 and 2011, respectively, from Institute of Applied Mechanics at National Taiwan University, Taipei, Taiwan. She was a researcher in the field of the electromechanical coupling behaviors of micro electromechanical devices. Her research interests are including design, modeling, and fabrication of microelectromechanical systems (MEMS). Currently, her research group also focuses on developing the flexible sensor technologies, and simulation model for IC package technologies.

Abstract: In this study, a flexible sensor module was developed that can be applied in sit up training exercises. Silver films were sputtered onto flexible substrates to produce a flexible sensor. Assuming that back muscle elongation is positively correlated with the variations in skin surface length, real-time resistance changes exhibited by the sensor during simulated trainings were measured. The results were used to identify the relationship between resistance change and skin surface length. Back extensor muscle is classified to three levels according to their skin stretch and corresponding change in electrical resistance measured by flexible sensors. The area with the largest skin stretch corresponds to the sensor location that measures the largest change in resistance. Results show that the major training site is lower erector spinae. Furthermore, the developed module can facilitate real-time monitoring of sit up training exercises. Inaccurate movements cause drastic resistance changes in the films of the flexible substrates, and the results are instantly displayed on a screen. Thus, people using the developed sensor in sit up training can immediately adjust their posture to the appropriate position.


Younghoon Cheon
Yonsei University, Republic of Korea
Title: Symmetry Breaking Initiated Absolute Enantiomeric Excess Determination of Carbon Nanotube Ensemble by Chiral Flavin Helix

Biography: Younghoon Cheon received his B.S. degree in the Department of Biomedical Chemistry from Konkuk University, Glocal campus in 2018. He is currently pursuing a M.S. in the Chemistry department working with Prof. Sang-Yong Ju at Yonsei University. His research is focused on synthesis and separation of low dimensional carbon nanomaterials.

Abstract: Single-walled carbon nanotubes (SWNTs) whose helicity is defined by positive (P-) and minus (M-) handedness according to wrapping orientation of graphene exhibits the identical optical property for their isomer. The symmetry breaking of SWNT has profound effects on their optoelectronic properties that are essential for fundamental study and applications, and, however needs to be understood thoroughly. In this presentation, we report the photoluminescence (PL) and binding affinity differentiation of SWNT isomers undergo symmetry breaking by flavin mononucleotide (FMN) as chiral surfactant. Increasing the FMN concentration leads position-shifting and second PL revealed near initial PL. The shifted direction from the initial PL depends on the modality of SWNT. Using optical titration method which used achiral surfactant as a titrant, PL intensity trajectories of P- and M-SWNTs display universal two-step inflection upon replacement with FMN whose intensity corresponds to the abundance of SWNTs isomers which is confirmed by the circular dichroism measurement. The enantiomeric excess (ee) of SWNT ensemble was calculated based on the PL intensity difference, and the ee value decrease to less than 20% with increasing FMN concentration. This phenomenon is suggested to derive from the unidirectional torsion caused by the P-type FMN helical assembly on the isomeric SWNT surface, and the resulting optical transition shift exhibits opposite shift trends depending on handedness and modality of SWNT. Finally, we determined ee of SWNT dispersed by sodium cholate, universally used surfactant, using FMN as a titrant, and confirmed the extensibility of this general scheme for ee determination.[1]


Minsuk Park
Yonsei University,, Republic of Korea
Title: Scaling of Relative Binding Affinities and Cooperativities according to Ionic Charge of Various Surfactants on Single-walled Carbon Nanotubes

Biography: Minsuk Park received his B.S. degree in the Department of Chemistry and Medical Chemistry from Yonsei University, Wonju campus in 2015. He is currently pursuing a Ph.D. in the Chemistry department working with Prof. Sang-Yong Ju at Yonsei University. His research is focused on understanding optical properties of low dimensional nanomaterials and their applications

Abstract: High-end applications of single-walled carbon nanotube (SWNT) require understanding of their binding affinity (Kd) with various surfactants. Moreover, well-defined Kd value can be applicated for designing the separation method according to diameter, chirality, handedness, etc. In this presentation, we quantitatively determined the comprehensive Kd and the aggregation number (γ) of nine nonionic/anionic surfactants according to SWNT chirality and some cases of handedness. Photoluminescence (PL)-based optical titration using flavin mononucleotide (FMN)-SWNT composites showing the largest redshifted optical transition displayed obvious two-step PL deflection corresponding to partial and full replacements of FMN, respectively. Specifically, Especially, the second transition exhibited sigmoidal PL change whose middle point denoted by the reciprocal of Kd slightly differs from critical micelle concentration of surfactant alone, which suggests the enhanced micellization on the SWNT surface. Moreover, nonionic polymeric surfactants displayed larger Kd and lower γ values than those of anionic surfactants due to the differences such as the occupied volume of on the SWNTs, surfactant organization structure, and specificity of the hydrophobic part. Especially, Kd and γ during the titration process were affected by the degree of orderliness of FMN supramolecules on SWNT surface induced by the aging, leading to a more stable complex. This study suggests that scaling the interactions between surfactant and SWNT by using surfactant replacement provides novel guidelines to design fine-tuned SWNT sorting method that combined by more than two surfactants.[1]


Xiao-Mei Zhang
Department of Mechanical Engineering, Tokyo Institute of Technology, Japan
Title: MoS2 Homojunction Structure Enabled by ‘In-Depth’ Plasma Doping for UV Photodetectors Application

Biography: Dr. Xiao-Mei Zhang, Ph.D in Engineering, now is an Assistant professor in Tokyo Institute of Technology, Japan. She got her Ph.D in Materials Physics and Chemistry in 2010. Her primary research involves the utilization of nanomaterials independently, or as part of a hybrid structure for the investigation of new exploitable properties. Specifically, she is driven to the study of synthesis of functional nanomaterials, material physical properties modulation, morphology and structure of material phases, construction of nanostructured junctions and junction interface characterization, and optoelectrical performance evaluation.

Abstract: Two-dimensional (2D) transition metal dichalcogenides (TMDCs), such as MoS2, have attracted considerable attention owing to the unique optical and electronic properties related to its 2D ultrathin atomic layer structure. MoS2 is becoming prevalent in post-silicon digital electronics and in highly efficient optoelectronics due to its extremely low thickness and its tunable band gap (Eg = 1–2 eV). For low-power, high-performance complementary logic applications, both p- and n-type MoS2 FETs (NFETs and PFETs) must be developed. NFETs with an electron accumulation channel can be obtained using unintentionally doped n-type MoS2. However, the fabrication of MoS2 FETs with complementary p-type characteristics is challenging due to the significant difficulty of injecting holes into its inversion channel. Plasma treatments with different species (including CF4, SF6, O2, and CHF3) have also been found to achieve the desired property modifications of MoS2. In this work, we demonstrated a p-type multilayer MoS2 enabled by selective-area doping using CHF3 plasma treatment. Compared with single layer MoS2, multilayer MoS2 can carry a higher drive current due to its lower bandgap and multiple conduction channels. Moreover, it has three times the density of states at its minimum conduction band. Large-area growth of MoS2 films on 300 nm thick SiO2/Si substrate are carried out by thermal decomposition of ammonium tetrathiomolybdate, (NH4)2MoS4, in a tube furnace. a two-step annealing process is conducted to synthesize MoS2 films. For the first step, the temperature is set to 280 °C for 30 min in an N2 rich environment at 1.8 Torr. This is done to transform (NH4)2MoS4 into MoS3. To further reduce MoS3 into MoS2, the second step of annealing is performed. For the second step, the temperature is set to 750 °C for 30 min in a reducing atmosphere consisting of 90% Ar and 10% H2 at 1.8 Torr. The grown MoS2 films are subjected to out-of-plane doping by CHF3 plasma treatment using a Dry-etching system (ULVAC original NLD-570). The radiofrequency power of this dry-etching system is set to 100 W and the pressure is set to 7.5 mTorr. The final thickness of the treated samples is obtained by etching for 30 s. Back-gated MoS2 PFETs were presented with an on/off current ratio in the order of 103 and a field-effect mobility of 65.2 cm2V-1s-1. The MoS2 PFETs photodetector exhibited UV photodetection capability with a rapid response time of 37 ms and exhibited modulation of the generated photocurrent by back-gate voltage. This work suggests the potential application of the mild plasma-doped p-type multilayer MoS2 in UV photodetectors for environmental monitoring, human health monitoring, and biological analysis.


Yuan Lin
Chinese Academy of Sciences, Changchun, P. R. China
Title: One-step assembly of multi-layered structures with orthogonally oriented stripe-like patterns on the surface of a capillary tube

Biography: Yuan Lin obtained her PhD in Materials Science from Jilin University (2008). After two years of post-doctoral research at Department of Chemistry and Biochemistry in the University of South Carolina, she became an Associate Professor in the State Key Lab of Polymer Physics and Chemistry of Changchun Institute of Applied of Chemistry, Chinese Academy of Sciences. Her research interests are the functioned biomaterials, self-assembly, as well as interaction between cells and materials.

Abstract: The construction of nano- or micro-structured surfaces is important for both theoretical research and practical applications. Confined evaporative self-assembly (CESA) is a kind of fast, cheap, facile and large-scale patterning technique based on solvent evaporation. When a solution is injected into a geometrical constraint, a thin meniscus is formed at the three-phase contact line (CL), under which droplet evaporation is restricted to occur only at the edge, thus, the evaporation process can be precisely controlled. With the evaporation of the solvents, the solutes would be brought to the CL by convective flow, thereby obtaining highly regular patterns. In this work, we presented a facile, rapid and controllable method for the construction of orthogonal stripe patterns in one-step on the inner and outer surfaces of a capillary tube using the confined evaporative self-assembly (CESA) method. The sizes of the stripe patterns could be tuned by varying the concentration of polymer solutes, i.e. P3HT and PLA, in the blending solutions and the diameters of the concentrically aligned glass capillary tubes. More importantly, these ordered stripe patterns with orthogonal orientations have the ability to induce cell alignment by “contact cue guidance”. These structures mimic the structures and functions of colon tissues. This strategy can potentially be utilized in the self-assembly of other polymers and has the ability to better mimic the tubular scaffolds for in vivo and tissue engineering applications.


Minsuk Park
Yonsei University,Republic of Korea
Title: Multimodal Near-IR Hg(II)-Selective Probing of Flavin Mononucleotide Helical Assembly on Single-walled Carbon Nanotubes

Biography: Minsuk Park received his B.S. degree in the Department of Chemistry and Medical Chemistry from Yonsei University, Wonju campus in 2015. He is currently pursuing a Ph.D. in the Chemistry department working with Prof. Sang-Yong Ju at Yonsei University. His research is focused on understanding optical properties of low dimensional nanomaterials and their applications.

Abstract: Mercury, one of the most prevalent heavy metals in the environment, has become a growing environmental and human health problem. Owing to health and environment issues, novel methods for detecting mercury are in great demand. In this presentation, we developed a sensor system, containing flavin mononucleotide (FMN) pairs bonded in a helical motif to single-walled carbon nanotube (SWNT), that selectively binds Hg2+ rather than 8 metal ions. Absorption-based stoichiometric studies show that FMN preferentially forms a 2:1 rather than a 1:1 complex with Hg2+ at high FMN concentrations. Based on the similarity to the thymine-Hg-thymine complex, it is suggested that 2:1 complex between opposing pair of FMN groups and Hg2+ comprises a Hg-bridged pair of FMN groups. Upon addition of as little as a few hundred nanomoles of Hg2+, FMN-SWNT selectively detects Hg2+ by undergoing changes in the intensity and wavelength of near-IR (NIR) photoluminescence (PL). Moreover, FMN-SWNT presents simultaneous multiple sigmoidal changes in NIR PL of SWNT having different chiral vectors with Hg2+ addition. Computational calculations indicate that those sigmoidal changes in NIR PL originate from Hg-mediated structural changes occurring on the helical array of FMN on SWNT. This proposal that Hg-bridged FMN pairs are formed on FMN−SWNT was assessed using Fourier transform infrared spectroscopy and high-resolution transmission electron microscopy. In addition, circular dichroism study revealed that FMN-SWNT decreases its dichroic bands upon the addition of Hg2+ due to the formation of a centrosymmetric FMN-Hg-FMN triad on SWNT. This selective detection of FMN-SWNT is applied to organomercurials detection to confirm the extensibility. The binding mode specificity and multimodal changes observed in response to Hg2+ ions suggest that systems based on FMN−SWNT can serve as in vivo NIR beacons for the detection of various mercury derivatives.[1]


Younghoon Cheon
Yonsei University, Republic of Korea
Title: One-step Selective Dispersion of Highly Pure Large-Diameter Semiconducting Single-walled Carbon Nanotubes by Flavin for Thin-Film Transistors

Biography: Younghoon Cheon received his B.S. degree in the Department of Biomedical Chemistry from Konkuk University, Glocal campus in 2018. He is currently pursuing a M.S. in the Chemistry department working with Prof. Sang-Yong Ju at Yonsei University. His research is focused on synthesis and separation of low dimensional carbon nanomaterials.

Abstract: Semiconducting (s-) single-walled carbon nanotubes (SWNTs) have excellent electrical, optical, and mechanical properties, which can apply them for various optoelectronic applications such as Thin-Film Transistor (TFT), photovoltaic, etc. Despite their valuable application possibilities, most synthesized SWNTs were a mixture with s- and metallic (m-) SWNTs whose heterogeneity causes critical limitation to facile electronic application. The growth method of single SWNT chirality has a low throughput, many researchers developed various method to separate and enrich s- and m-SWNTs from synthesized SWNTs. In this presentation, we demonstrate a new, and simple method for separating large-diameter s- and m-SWNTs by using N-dodecyl isoalloxazine (FC12) as a surfactant. Facile enrichment was conducted by separating supernatant and precipitate after sonication and benchtop centrifugation. Especially, a FC12-SWNT dispersion in p-xylene condition can be enriched selectively to give s-SWNT with over 98% purity in the supernatant and m-SWNT with 78% purity in the precipitate, respectively. Furthermore, increasing the centrifugal force can increase s-SWNT purity over 99.6% with less carbonaceous impurities, providing purity controllability by improving the selectivity of FC12. The photoreduction properties of FC12 advantageously was utilized to induce conformational change and precipitated enriched SWNT upon UV irradiation. A TFT devices prepared from a dispersion of enriched s-SWNTs was observed to display p-type conductance with average on/off ratio over 106 and average mobility over 10 cm2/V∙s.[1]


Zhongli Lei & Hong Yang
1 Key Laboratory of Applied Surface and Colloid Chemistry, School of Chemistry & Chemical Engineering, Shaanxi Normal University, China
2 Basic Experimental Teaching Center, Shaanxi Normal University, China

Title: Synthesis of light and dual-redox triple-stimuli-responsive degradable micelles as nanocarriers for controllable release

Biography: Zhongli Lei, Ph. D. As a professor and doctoral supervisor in Shaanxi Normal University from 2008 to present. As a post-doctoral at Johns Hopkins University, USA, from 2009.3 to 2010.4. In recent years, host 1 items for the National Natural Science Foundation of China. About 40 SCI papers have been published. About 20 Chinese invention patents have been authorized. My present research focuses on the following main topics: (1) Design and Development of Multifunctional polymer materials; (2) Nanocomposite materials

Abstract: Polymer-based drug delivery system has attracted much attention for their advantages like improving insoluble drug solubility, prolonging circulation time, minimizing drug loss. However, the lack of degradation and biocompatibility is still the challenge for their applicant in medicine.[1-3] In this study, a biodegradable polymer with light and dual-redox triple-stimuli-responsiveness was synthesized, and it was further employed in the delivery and controllable release of PTX. Firstly, mPEG-b-PACL was synthesized by ROP, alkyne-PO-SS-PNBM-Br was synthesized by ATRP, then it was modified to mPEG-b-PACL by click chemistry to got mPEG-b-P(PO-SS-NBM)CL. The structure of copolymer and the stimuli-responsiveness of the micelles were confirmed by 1H NMR, FT-IR, TEM, UV-Vis and DLS, respectively. The drug loading rate and encapsulation rate of mPEG-b-P(PO-SS-NBM)CL35 were up to 11.2%, 72.3%. By MTT method, this delivery system had good biocompatibility, biodegradablity and inhibitory effect on A549 proliferation process, which proved this nanocarrier had great potential in cancer treatment.


Haiying Huang
Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun,, P. R. China
Title: Surface Functionalized Nanoparticles from Gradient Copolymer

Biography: Polymeric nanoparticles have drawn great attention in biological and industrial fields due to their controllable nanosize and morphology and functional properties. However, improve the solid content and control of the nanoparticle size as well as its distribution is still a challenging task. In this work, we describe a modified nanoprecipitation process called micellization assisted nanoprecipitation (MAN), which was employed to disperse the styrene (St) /methyl methacrylate (MMA) gradient copolymer with only one carboxyl end group in water. Through MAN process the end functionalized gradient copolymer was transformed to the surface functionalized nanoparticles with much higher solid content and narrower size distribution. Moreover the size of the nanoparticles can be successfully tuned by mixing St/MMA gradient copolymer with different amount of polystyrene homopolymer. It was found that these nanoparticles could be further modified and become light-responsive since the carboxyl groups was linked to surfaces of nanoparticles by a UV cleavable bond. This work offers an alternative way to prepare stable, responsive and functionalized nanoparticles with controllable size.

Abstract: Polymeric nanoparticles have drawn great attention in biological and industrial fields due to their controllable nanosize and morphology and functional properties. However, improve the solid content and control of the nanoparticle size as well as its distribution is still a challenging task. In this work, we describe a modified nanoprecipitation process called micellization assisted nanoprecipitation (MAN), which was employed to disperse the styrene (St) /methyl methacrylate (MMA) gradient copolymer with only one carboxyl end group in water. Through MAN process the end functionalized gradient copolymer was transformed to the surface functionalized nanoparticles with much higher solid content and narrower size distribution. Moreover the size of the nanoparticles can be successfully tuned by mixing St/MMA gradient copolymer with different amount of polystyrene homopolymer. It was found that these nanoparticles could be further modified and become light-responsive since the carboxyl groups was linked to surfaces of nanoparticles by a UV cleavable bond. This work offers an alternative way to prepare stable, responsive and functionalized nanoparticles with controllable size.


Zhi-Hong Liu
Key Laboratory for Macromolecular Science of Shaanxi Province, School of Chemistry and Chemical Engineering, Shaanxi Normal University, PR China
Title: Preparation of fan-like 2MgO•B2O3•2H2O nanostructure with excellent adsorption performance for triphenylmethane dyes removal

Biography: Zhi-Hong Liu, Ph. D. As a professor and doctoral supervisor in Shaanxi Normal University from 2005 to present. As a visiting scholar at University of Notre Dame, USA, from 2009.3 to 2010.4. In recent years, host 3 items for the National Natural Science Foundation of China. About 150 SCI papers have been published. About 20 Chinese invention patents have been authorized. My present research focuses on the following main topics: (1) Preparation and adsorption application of hierarchical porous materials with nanostructures; (2) Preparation and property of RE doped borate luminescent materials.

Abstract: Triphenylmethane dyes are widely used in our life, but these dyes are generally toxic, potentially carcinogenic and not easily biodegradable, which makes their presence in water bodies a serious threat to environment, health and safety [1]. Among the various treatment techniques, the adsorption process has attracted more attention because of its advantages such as low cost, simple operation, environment-friendly nature, ambient temperature and pressure, and simultaneously removal of several coloring materials[2,3]. In this work, the hierarchical porous fan-shaped 2MgO•B2O3•2H2O nanostructure constructed by nanobelts was prepared by solvothermal approach, which was characterized by the XRD, FT-IR, TG-DTA, SEM and TEM. It exhibited efficient removal of triphenylmethane dyes such as AF, MG and BF from aqueous solution. The adsorption process was in accord with the pseudo-second-order model, and well-fitted by Langmuir model. The effect of various operating parameters such as pH, dye concentration, and temperature on the adsorption process were also investigated. The corresponding adsorption thermodynamic parameters including ΔH°, ΔS°, and ΔG° were obtained. The as-prepared sample could be as a highly efficient absorbent for triphenylmethane dyes in the field of wastewater treatment.


Shi-Ping Zhang
University of Science and Technology Beijing, China
Title: Effect of Er interlayer on microstructure of erbium oxide coating on steel

Biography: Shi-ping Zhang is currently working at University of Science and Technology Beijing. The main direction of his research is functional materials.

Abstract: The properties of a coating depend on its integrity and the interface properties between the coating and the substrate. This study pre-sputtered an Er interlayer before the reactive sputtering of an erbium oxide coating to improve the thermal stability between erbium oxide and a stainless substrate. The coatings were annealed at 700 °C and 900 °C to investigate the microstructure evolution in a high-temperature environment. The composition, topography, and microstructureof the coating with and without the Er interlayer were evaluated and the effect of the Er interlayer was assessed. This study demonstrated that the presence of an Er interlayer effectively reduces the compressive stress of the coating on the steel. Moreover, such interlayer promotes the growth of thermal stable cubic Er2O3 and accelerates the phase transformation from monoclinic to cubic during annealing, thus improves hardness to a certain extent. During heat treatment, isotropic grain growth and phase transformation are energy competition processes. The energy required for grain growth is lower than that of the phase transformation barrier when the crystalline grains of the same phase are clustered together, and grain growth is accompanied by the stress reduction in the coating. The crystalline grains of different phases cannot coalesce and grow up when they are scattered, the grains tend to change into grains with the same crystal structure. The phase transformation from monoclinic to cubic gradually occurs from the surface to the inside of the coating during annealing. Impurity appeared in samples experienced high-temperature annealing. The surface of the CLAM steel substrate directly exposed to highly active oxygen plasma was non-uniformly oxidized to form α-Fe2O3, which made the interface between the substrate and the coating irregular, and pre-sputtering Er without oxygen supply fundamentally prevented this process. High-temperature annealing leads to the reaction of FeOx (x = 0 or 1.5) and adjacent Er2O3 and generates ErFeO3 at the interface. Moreover, high-temperature annealing causes the diffusion of Fe and Cr atoms from the substrate into the coating to form scattering and localized low-resistance spinel Fe–containing oxide nanocrystals. Pre-sputtered Er interlayer could obstruct the above-mentioned process. However, annealing at excessively high temperature (such as 900 °C) can result in a significant segregation of Cr in the substrate surface to form an irregularly distributed CrOx-type oxide.


Jinguang Yang
University of Science and Technology Beijing, China
Title: Synthesis of silicon nitride whiskers by rapid nitridation of liquid silicon

Biography: Jinguang Yang is currently pursuing her Ph.D.degree at University of Science and Technology Beijing under the supervision of Prof. Ping Wu. His research interests focus on in situ growth of ceramic materials by Raman spectroscopy

Abstract: Silicon nitride has many excellent properties such as lightweight, chemical stability, good resistance to thermal shock and oxidation. Siliconnitride whiskers possess single-crystal structures without defects like voids, dislocation and grain boundary so that their density and strength are close to the theoretical values. Thus the silicon nitride whisker can be efficiently applied to reinforced composite materials. Several efforts had been devoted to increasing the nitriding rate through add catalysts to form eutectic droplets of silicon and catalysts, as a medium for growth of Si3N4. In this work, a method of synthesis silicon nitride whiskers has been adopted which can improve synthetic efficiency without catalysts addition. Weproduced the silicon nitride whiskers using micron-sized silicon powders at 1500°C. in order to see grow process of whiskers, we acquire some products of different reaction stages through quench. The high revolution electric microscope paragraph shows that the silicon nitride whiskers are well quality beta-Si3N4. The state transformation of micron-sized silicon particles and the growth process of silicon nitride whisker were researched using Scan Electric Microscope and Laser Confocal Micro-Raman. Silicon particles would form separated liquid silicon droplets when the temperature elevated to 1500°C. Nitrogen diffuse to liquid silicon and reacted with liquid silicon to generate silicon nitride whiskers. The whiskers grows via vapor-liquid-solid mechanism. Compared to adding catalysts, it could improve the synthesis efficiency for liquid silicon replaces eutectic liquid droplets formed by catalysts as reaction media.


Yu-Ling Lin
Agricultural Biotechnology Research Center, Academia sinica, Taipei, Taiwan
Title: Antitumor effect of RCH-1 encapsulated with a polycationic liposome containing polyethylenimine and polyethylene glycol complex for colorectal cancer therapy

Biography: Yu-Ling Lin works as an Assistant Research Fellow in Agricultural Biotechnology Research Center, Academia sinica, Taipei, Taiwan. In 2011, she received the Ph.D degree in Institute of Molecular Medicine and Bioengineering from National Chiao Tung University (NCTU), Hsinchu, Taiwan. From 2011 to 2013, she was a postdoctoral research fellow in Center for Bioinformatics Research, NCTU. From 2013 to 2018, she was promoted as an Assistant Research Fellow. In 2017, she was a Visiting Scientist in Department of Biology, Johns Hopkins University, Baltimore, USA. Her current research interests includes plant derived immunomoldulator development, anti-cancer drug development, and nanomedicine.

Abstract: RCH-1 is an anti-tumor drug that derived from the plant lignan of nordihydroguaiaretic acid. It had been proposed that RCH-1 inhibit the interaction between the transcription factor Sp1 and its DNA-binding site via DNA groove-binding. RCH-1 is a potential anticancer agent for colorectal cancer therapy. However, RCH-1 has high toxicity to normal tissues that is the limitation of RCH-1 for cancer chemotherapy. In this study, we used a Lipid-PEG-PEI complex (LPPC) to encapsulate RCH-1 to keep its cytotoxicity and reduce the side effects to normal tissue. RCH-1 was encapsulated to form LPPC/RCH-1, the particle size and zeta potential of LPPC/RCH-1 were analyzed by dynamic light scattering and Zetasizer. Later, human and mouse colorectal carcinoma cell lines HT-29 and CT-26 were treated with seral dilution concentration of LPPC/RCH-1, respectively. Cytotoxicity was measured by MTT assay. LPPC/RCH-1 induced cell death were analyzed by annexin V staining. In animal study, CT-26 tumor bearing Balb/c mice were treated with LPPC/RCH-1. The tumor volumes of mice were measured weekly. LPPC/RCH-1 had an average size of 200 nm and a zeta potential of approximately 35 mV. LPPC/RCH-1 provided higher cytotoxicity in both colorectal cancer cells. In addition, LPPC/RCH-1 significantly increased tumor cell apoptosis. LPPC/RCH-1 also efficiently inhibited the cell growth in vivo. These results indicate that the LPPC/RCH-1 still kept the antitumor effects of the drug and may supply a feasible strategy for the colorectal cancer therapy in the future


Ping Wu
University of Science and Technology Beijing, China
Title: Annealing effects on the photoluminescence properties of erbium oxide

Biography: Professor Ping Wu is currently working at Beijing University of Science and Technology. The main direction of her research is functional materials and soft materials.

Abstract: As a heavy rare earth oxide, erbium oxide (Er2O3) has many attractive properties. Monoclinic Er2O3 has useful properties not found in stable cubic Er2O3, such as unique optical properties and high radiation damage tolerance. The deposited mixed phase of cubic and monoclinic Er2O3 (M-Er2O3) coatings were prepared by mid-frequency pulsed magnetron sputtering at the substrate temperature of 350 °C, whereas 700 °C annealed coating was pure phase cubic Er2O3 (C-Er2O3) with almost unchanged grain size. Photoluminescence properties of these coatings were characterized by a confocal micro-Raman spectrometer equipped with 325, 473, 514, 532, 633 nm lasers, and the influence of microstructure on the fluorescence properties was analyzed in detail. By comparing and analyzing the spectra of the M-Er2O3 and C-Er2O3, four distinct differences of fluorescence spectra between C-Er2O3 and monoclinic Er2O3 (B-Er2O3) were discovered. First, there were numerous fine structures in the fluorescence spectra of the C-Er2O3, whereas those of B-Er2O3 were relatively broad. Second, the highest peaks in the green emission region of B-Er2O3 were located at 523 nm and 548 nm, respectively, whereas distinctly strong characteristic peaks in C-Er2O3 were located at around 539 nm and 564 nm. Third, luminous efficiency of C-Er2O3 was higher than that of B-Er2O3. Four, the fluorescence intensity ratio of the green emissions (RG) of B-Er2O3 was lower than that of C-Er2O3, and more sensitive to laser power. Based on the above features, a novel method for rapid phase identification of Er3+ doped cubic and monoclinic rare earth sesquioxides at room temperature was proposed. In addition, the room temperature fluorescence peaks in C-Er2O3 at the range of 400-900 nm were assigned, and the detailed steps were given.


Yashao Chen
Shaanxi Normal University, China
Title: Construction of HANRs-ZnONRs composite nanoarrays onto magnesium alloy surface by hydrothermal synthesis for enhanced corrosion resistance and antibacterial activities

Biography:

Abstract: Magnesium alloy (MgA) has been widely used as orthopedic and cardiovascular scaffolds owing to its good biocompatibility, unique biodegradability and excellent mechanical properties. However, poor corrosion resistance and susceptible to infection after implantation, seriously limit the potential applications of MgA in the biomedical field. Herein, we fabricated composite nanoarrays of hydroxyapatite nanorods (HANRs) and ZnO nanorods (ZnONRs) onto the surface of MgA (MgA-MgO-HANRs-ZnONRs) by a stepwise introduction of MgO film using micro-arc oxidation (MAO) treatment, HANRs using microwave-assisted hydrothermal synthesis and ZnONRs using hydrothermal synthesis. The morphology and chemical composition of MgA-MgO-HANRs-ZnONRs was characterized by field-emission scanning electron microscopy (FE-SEM), X-ray diffraction (XRD), and energy dispersive X-ray spectroscopy (EDS), indicating that HANRs-ZnONRs were successfully fabricated on the surface of MgA-MgO. The surface of MgA-MgO-HANRs-ZnONRs exhibited excellent hydrophilicity as evidenced by the low water contact angle of 3o. Compared with the original MgA, the corrosive current density (icorr) of MgA-MgO-HANRs-ZnONRs decreased 2 orders of magnitude, indicating that its corrosion resistance was effectively improved. The MgA-MgO-HANRs-ZnONRs performed excellent antibacterial properties with the bactericidal rates of 96.5% against S. aureus and 94.3% against E. coli.


Ya-nan Li
University of Science and Technology Beijing, China
Title: Effect of Ba and K Doping on Thermoelectric Properties of [Ca2CoO3]0.62 [CoO2]

Biography: Ya-nan Li is currently pursuing her Ph.D.degreeat University of Science and Technology Beijing under the supervision of Prof. Ping Wu.Her research interests focus on synthesizing thermoelectric materialsandtuning the properties of the thermoelectric materials.

Abstract: Thermoelectric materials can realize the direct conversion of electric energy and heat energy, which is a green and environmentally friendly method of energy conversion. [Ca2CoO3]0.62 [CoO2], as a high temperature oxide thermoelectric material, has attracted wide attention. Thermoelectric conversion efficiency is characterized by thermoelectric merit value ZT, ZT = S2σT/k, where S is Seebeck coefficient, σis conductivity, T is absolute temperature and k is thermal conductivity.The tuning of electron and phonon by ion doping is an effective method of improvingthe performance of thermoelectric materials. In this paper, the effect of Ba and K doping on the thermoelectric properties of [Ca2CoO3]0.62[CoO2] was studied. Theoriginal samples, 0.05mol K-doped and 0.05mol Ba-doped samples were prepared by sol-gel method. The single phase composition of the samples were analyzed by X-ray diffraction. The overlapping morphology of the samples was observed by Scanning Electron Microscopy. The relationship between the Seebeck coefficient and the electrical conductivity of the samples from 300K to 1026K were tested by using a comprehensive system ofConductivity-Seebeck Coefficient Measurement. The Seebeck coefficients of Ba and K doped samples are slightly higher than those of the original samples in the measuring temperature range. The Seebeck coefficient of K-doped samples reaches about 168μV/K at 1026 K. Through analysis and discussion, it can be concluded that the electrical conductivity of Ba-doped samples reaches 101.17 S/cm at 1026 K, which is nearly 19% higher than that of the original sample of 84.97 S/cm. Theelectrical conductivity of K-doped samples also reached 96.99 S/cm, compared with the original sample, it increased by 14%.The power factor PF calculated by electrical conductivity and Seebeck coefficient, at higher temperature can be significantly improved for Ba and K doped samples. The above results indicate that Ba and K doping are beneficial to improve the thermoelectric properties of [Ca2CoO3]0.62[CoO2].


B. Przybyszewski
Warsaw University of Technology, Faculty of Materials Science and Engineering,Poland
Title: Effect of polymer coatings surface topography and composition modifications on their hydrophobic and icephobic properties

Biography: Bartlomiej Przybyszewski has almost 10 years’ academic and research experience. He graduated from the Warsaw University of Technology, Faculty of Materials Science and Engineering and received his Master’s degree in 2012. Since 2016 Ph.D. candidate at the same Faculty. For four years he was a science and research employee in Institute of Lightweight Engineering and Polymer Technology at the Technische Universitat. He has a scientific experience in manufacturing and characterization of composite materials. For over three years his scientific work focused on developing of manufacturing processes of composite materials. In his PhD he focuses on chemical and physical modifications of icephobic and hydrophobic coatings.

Abstract: Ice creation and accretion may cause malfunction or serious performance degradation in outdoor facilities and structures, such as aircraft, ship, locks and dams, offshore platforms, solar panels, wind turbines, power transmission towers and lines, and sports facilities, leading to huge economic loss or even loss of human lives. Icephobic materials, typically applied in the form of coatings, have received growing attention in the last decade. To prevent or to suppress the ice build-up, researchers and engineers have made a great deal of effort to understand the physicochemical mechanisms of freezing, and developed many anti/de-icing strategies over the last decades. One of them, called passive (no extra external energy sources are needed), is to make the surface phobic to ice formation and/or adhesion. This work focuses on determining the synergic effect of surface development and surface chemical composition on icing phenomena (ice adhesion, water freezing time) of polymeric materials. In recent years, it has been demonstrated that appropriate design of surface topography and chemical composition leads to significant reduction of ice adhesion strength and to delay of water freezing. Therefore, it is extremely important to explore phenomena occurring during water droplet freezing on investigated materials. The study of adhesion forces and detachment mechanism of already formed ice on selected substrates is also essential. In this work the effect of microstructure, roughness and chemical composition of investigated material surfaces on its icephobic properties was studied. Research necessary to achieve such defined objective included the simultaneous use of manufacturing and characterization methods. Different polymers were studied as substrate materials. They were modified by additives, nanoparticles as well as by Laser Patterning to achieve different topography, roughness and chemical composition of polymer surface. It was planned to manufacture micro-nanostructured hierarchical surface by combination of nanoparticles with micropatterns made by laser. Characterization of such manufactured materials was carried out by the use of scanning electron microscopy (SEM), profilometry and x-ray photoelectron spectroscopy (XPS). Icephobic properties were validated in wettability tests, ice adhesion strength tests and in water freezing delay tests on manufactured polymeric substrates.


Zhihao Yuan
Tianjin University of Technology, Tianjin, China.
Title: The visible-light-driven photocatalytic properties of monodisperse ZnS-coated RGO composites

Biography: Professor Zhihao Yuan is a professor at Tianjin University of Technology (Tianjin, China). He has published a large number of SCI/EI articles and patents. His expertise covers the following aspects: Regular alumina nanopillar arrays; Synthesis and Characterization, and Photocatalytic Activity of ZnFe2O4/TiO2 Nanocomposite; Field Emission Property of Highly-ordered Monodispersed Carbon Nanotube Array.

Abstract: ZnS with a wide direct band gap (3.6 eV) possesses highly negative potentials of excited electrons and strong oxidation, thus it is considered as an excellent active photocatalyst as one of typical II–VI group semiconductors [1]. However, narrow photoabsorption range (ultraviolet light zone) inhibits its visible-light photocatalytic efficiency [2]. For this, ZnS-coated reduced graphene oxide (ZnS-RGO) heterogeneous photocatalysts were constructed to create improved visible-light activity [3]. Here, a facile one-step hydrothermal route was adopted to synthesize ZnS-RGO composites, in which ZnS nanoparticles were spread uniformly on the surface of reduced graphene oxide composites (RGO). The detail structure, morphology and optical properties of as-prepared samples were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), field-emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM) and UV-vis diffuse reflectance spectra (DRS). It is found that ZnS-RGO composites exhibited the higher degradation rate for the methylene blue (MB) under visible-light irradiation, compared with pure ZnS. Therefore, an introduction of RGO enhance visible-light activity of ZnS.


Sen Chen
University of Science and Technology Beijing, China
Title: Novel MOFs with high gap and steam adsorption capacity

Biography: Sen Chen works in the Physics Experiment Center of Beijing University of Science and Technology. He is a senior engineer, mainly engaged in the preparation of functional film materials, grain boundary/phase boundary segregation, physics experiment teaching, and experimental techniques.

Abstract: Chemical heat storage system is an energy power system which is recyclable and environmentally-friendly. Microporous and mesoporous adsorption materials gradually become important for the development of chemical storage systems. MOFs, one type of porous materials, are widely used for heat-transformation applications. The novel bimetallic MOFs was successfully synthesized by doping metal ions (such as Ag, Zn, Mg, etc.) in solvothermal synthesis of MIL-101, and then characterized. The water vapor adsorption performance was tested. XRD results show that the structure of MIL-101 is not changed when metal ions are doped. By SEM observations, the particle size is changed by the doping of metal ions. The doped metal ions is found to distribute uniformly in the sample. The experimental results show that metal ions are incorporated into MIL-101 frame.It has been found that metal ions doping affects the specific surface area and porosity of MIL-101. With a certain concentration doping, the adsorption capacity of gases (such as hydrogen, carbon dioxide, methane, etc.) and steam is significantly improved. The adsorption performance of MOFs can be effectively improved by doping metal ions.


Fangdi Hu
Lanzhou University, Lanzhou, China
Title: Novel nanomaterial of porous graphene functionalized black phosphorus as electrochemical sensor platform for bisphenolA detection

Biography: Hu Fangdi, professor, served as a member of the World Federation of Pieces Committee, a member of the Gansu Provincial Chromatography Committee, and a member of the Gansu Provincial Drug Analysis Committee. At present, he is mainly engaged in the separation and analysis of traditional Chinese medicine ingredients, research on new Chinese medicines and health products, research on quality standards of traditional Chinese medicines and pharmacokinetic studies in Chinese medicine. He has hosted or participated in more than ten scientific research tasks in scientific research and scientific and technological development.

Abstract: The porous graphene functionalized black phosphorus composite (PG-BP) was successfully synthesized via strong coherent coupling between porous graphene surface plasmons and anisotropic black phosphorus localized surface plasmons by the method of penetration of infrared ray using infrared drying. And it was used to fabricate a novel high-sensitive electrochemical sensor for determination of bisphenol A (BPA) in daily use and biological samples. The PG-BP had been characterized by infrared spectroscopy, Raman, X-ray photoelectron spectroscopic, scanning electron microscopy and energy dispersive spectrometer, indicating that PG-BP with the large specific surface area and good electrical conductivity was successfully prepared. In addition,electrochemical properties of the modified materials are comparably explored by means of impedance spectroscopy and cyclic voltammograms. Under the optimal conditions, BPA was determined quantitatively using differential pulse voltammetry. The results showed that the BPA detection current has a good linear relationship in the range of 4.3×10-8 ~5.5×10-5mol/Lwith a detection limit of 7.8×10-9mol/L (S/N = 3).Results from the present work illustrate the prominent performance of PG-BP as a sensing channel for BPA sensor application and the huge potential of PG-BP as an electrode material.


Herrera Domínguez Sara Jacqueline
Materials Research Institute, UNAM. Av. Universidad, Mexico City.
Title: Fabrication and characterization of polymer scaffolds for organ-on-a-chip technology

Biography: Electrospinning is a a fast, easy, cost-effective and affordable way to fabricate nanofibers if is used for rapid-prototyping of biological scaffolds. However the common experimental setup produces scaffolds of random fibers, and sometimes a specific extracellular matrix arrangement is needed in order to mimic the structure, functions and properties of certain tissue. In this work, we demonstrate fabrication of biological scaffolds of aligned fibers using patterned parallel electrodes as collector in electrospinning. This permits to control its geometry, topography and mechanics, and we also show the fabrication of biodegradable and biocompatible polymer scaffolds, alternating layers of aligned and random electrospun fibers in order to reproduce the natural assembly of extracellular matrix to seed fibroblasts and epithelial cells, respectively. The experimental procedure was carried out using poly(lactic-co-glycolic)acid (PLGA) and poly(epsilon-caprolactone) (PCL) blended with fish gelatin. This polymer scaffolds have been successfully fabricated and showed a good control of its morphology, alternating layers of aligned and random electrospun fibers. Microstructure, hydrophilicity, chemical and mechanical characterization of the scaffolds have been validated by means of scanning electron microscopy (SEM), contact angle measurement, Fourier-transform infrared spectroscopy (FTIR) and uniaxial tensile testing for mechanical properties. Cell culture showed that due to that good properties, PLGA and PCL scaffolds permit cell adhesion and it was also possible to observe that the elastic modulus of aligned fibers was higher than random fibers. The bioinspired strategy solution we present may be an excellent easy way to fabricate cellular scaffolds with control of geometry, topography and mechanics for cell culture, indeed it represents an interesting experimental protocol to reproduce biological scaffolds. Keywords: Electrospinning; synthetic polymers; tissue engineering scaffolds. 9th World Congress & Expo on Nanotechnology & Material science

Abstract: Electrospinning is a a fast, easy, cost-effective and affordable way to fabricate nanofibers if is used for rapid-prototyping of biological scaffolds. However the common experimental setup produces scaffolds of random fibers, and sometimes a specific extracellular matrix arrangement is needed in order to mimic the structure, functions and properties of certain tissue. In this work, we demonstrate fabrication of biological scaffolds of aligned fibers using patterned parallel electrodes as collector in electrospinning. This permits to control its geometry, topography and mechanics, and we also show the fabrication of biodegradable and biocompatible polymer scaffolds, alternating layers of aligned and random electrospun fibers in order to reproduce the natural assembly of extracellular matrix to seed fibroblasts and epithelial cells, respectively. The experimental procedure was carried out using poly(lactic-co-glycolic)acid (PLGA) and poly(epsilon-caprolactone) (PCL) blended with fish gelatin. This polymer scaffolds have been successfully fabricated and showed a good control of its morphology, alternating layers of aligned and random electrospun fibers. Microstructure, hydrophilicity, chemical and mechanical characterization of the scaffolds have been validated by means of scanning electron microscopy (SEM), contact angle measurement, Fourier-transform infrared spectroscopy (FTIR) and uniaxial tensile testing for mechanical properties. Cell culture showed that due to that good properties, PLGA and PCL scaffolds permit cell adhesion and it was also possible to observe that the elastic modulus of aligned fibers was higher than random fibers. The bioinspired strategy solution we present may be an excellent easy way to fabricate cellular scaffolds with control of geometry, topography and mechanics for cell culture, indeed it represents an interesting experimental protocol to reproduce biological scaffolds.


Jakub Vaněk
National Institute for NBC Protection, Kamenná, Czech Republic
Title: Composite textile material for catalytic degradation of Chemical Warfare Agents

Biography: He obtained his degree in Analytical chemistry at Masaryk University in Brno, Czech Republic where he was dealing with the chemistry and application of novel organometallic complexes. He is currently working as a research scientist in the Laboratory of chemical monitoring and protection at the National Institute for NBC Protection in the Czech Republic. He has more than 10 years’ experience in many fields of analytical chemistry. In recent years he has been participating in national safety research projects and he is focused mainly on the detection and identification of CWA, design and testing of novel chemical decontamination techniques involving the application of newly synthetized metal-based nanostructures and the development and testing of new materials and garments for personal chemical protective equipment.

Abstract: This contribution describes the application catalysts based on modified nanostructured metal oxides (doped TiO2, MnO2, CeO2 [1-3]) and novel metal-organic frameworks [4] into the chemical protective nanocomposite textile material. This new textile is suitable for the fabrication of the air-permeable chemical protective clothing (CWA, TICs, agricultural and medical applications) with sorption and self-decontamination properties with a minimal risk of secondary contamination which is caused by the release of adsorbed chemicals. The catalytic activity and efficiency of individual catalysts as well as the whole composite system has been investigated by means of degradation of live chemical warfare agents (sulfur mustard, soman, VX) and their simulants.


Shilan Feng
Lanzhou University, Lanzhou, P. R. China
Title: Immunoregulation activity of novel polysaccharide isolated from Radix Hedysari in vivo and vitro

Biography: Shilan Feng, School of pharmacy, Lanzhou University, China. Professor, PhD Supervisor.The main research direction is Chemical composition separation and analysis in Chinese herbal medicine and traditional Chinese medicine (TCM) preparation, Extraction and separation of macromolecular polysaccharide compounds, the structure research, from plant medicine. Metabolism research of traditional Chinese medicine chemical composition in animal

Abstract: A new, more effective and environment-friendly method of complex enzyme combined with ultrasonic extraction extracted and isolated three novel polysaccharides, (HPS-MCs: HPS-MC, HPS-MC (50%) and HPS-MC (80%)) of Radix Hedysari. Compared with traditional extraction method of polysaccharides (hot water extraction, HPS-R), the yield and the total carbohydrate content of HPS-MC significantly improved. HPS-MC (80%) exhibited relatively strong immunomodulatory activity and a dose-response relationship with concentration dependence under cyclophosphamide (CP) induced immunosuppressive conditions in mice models. In order to investigate the multiple relationships between the structural characteristics and immunomodulatory activity by a more comprehensive way, HPS-MC (80%) was fractionated into three major homogeneous polysaccharide fractions (HPS-MC (80%)s: HPS-MC (80%)-1, HPS-MC (80%)-2 and HPS-MC (80%)-3). Because the three homogeneous polysaccharides had different in mass percentages of monosaccharides species (rhamnose, arabinose, mannose, glucose and galactose) by GC and in molecular weight and chain conformation by HPGPC-MALLS, they promoted macrophages and splenocyte proliferation in different degree. The finding indicated that HPS-MC (80%) have prominent potential immune response, especially HPS-MC (80%)-2 and HPS-MC (80%)-3, which might be suitable as functional foods or a potential novel immunomodulator.


Hsiang-Chih Chiu
Department of Physics, National Taiwan Normal University,Taiwan
Title: Variations of the Out-of-Plane Elastic Moduli in Rubrene Bilayer Thin Films: an Atomic Force Microscopy Study

Biography: 6. Dr. Hsiang-Chih Chiu is an associate professor at the Department of Physics, National Taiwan Normal University. He specializes in atomic force microscopy-based techniques. His research focuses on the nanomechanical and nanotribological properties of materials including polymers, 2D materials, and metal oxide thin films.

Abstract: Understanding the nanomechanical properties of materials at the nanoscale is important for their future applications in the micro- or nano-electro-mechanical systems (MEMS or NEMS), especially for those employed in flexible electronics, actuators, and sensors. However, our knowledge about the nanomechanical properties of organic semiconductors with nanoscale thickness still remains limited. Here, we investigated the out-of-plane elasticity of rubrene thin films deposited on a silicon (100) substrate by performing nano-indentation on the films using atomic force microscopy (AFM)-based techniques, while the X-ray diffraction was used to determine the crystallinity of the films. We found that the out-of-plane elastic moduli of the rubrene thin films gradually increased from 7.8 GPa to 11.2 GPa, while the film thickness changed from 5 nm to 30 nm. When the film thickness was larger than 15 nm, the obtained elasticity became nearly constant. For solid-state materials, the atoms or molecules in the surface can be very different from those in the bulk phase due to the different boundary conditions. Therefore, our rubrene thin films can be considered to have a soft surface layer on top of a harder underlayer, and thus the observed elastic behaviors vs. film thickness were originated from the interplay between two rubrene layers of different mechanical properties. Our results may assist the development of NEMS devices that employ rubrene with nanoscale thickness.


Ahruem Beck
Dept. Metallurgical and Material Engineering , Gyeongsang national Univ., Jinju, South Korea
Title: She graduated from Gyeongsang National University in 2018 and is currently pursuing her master's degree in lightweight materials. She wrote an undergraduate thesis on the subject of "Semi-Solid AC7A Aluminum Alloy Fabrication and Microstructure Characteristics" and added a reheat test to poster presentations at ICAMR 2018, oral presentations at the Korean Foundry Engineering Institute. And she is registered as a co-author in two papers of IFFM 2017, ISNNM 2018. Recently, She is studying about eutetic Si behavior of A356 Aluminum alloy by adding Ca element. Her main majors are aluminum and magnesium, among other lightweight materials. She uses these alloys for casting and heat treatment, and characterization of metal materials.

Biography: She graduated from Gyeongsang National University in 2018 and is currently pursuing her master's degree in lightweight materials. She wrote an undergraduate thesis on the subject of "Semi-Solid AC7A Aluminum Alloy Fabrication and Microstructure Characteristics" and added a reheat test to poster presentations at ICAMR 2018, oral presentations at the Korean Foundry Engineering Institute. And she is registered as a co-author in two papers of IFFM 2017, ISNNM 2018. Recently, She is studying about eutetic Si behavior of A356 Aluminum alloy by adding Ca element. Her main majors are aluminum and magnesium, among other lightweight materials. She uses these alloys for casting and heat treatment, and characterization of metal materials.

Abstract: A356 aluminum alloy is the cast alloy, which is mainly used in automobile cylinder heads or piston blocks because of its low dimensional change at high temperatures and good wearability. However, in the A356 alloy, eutectic Si exists in acicular shape on microstructur. So it acts as a crack initiation site, causing breakage. Therefore, many researchers have been studying to modify the shape of eutetic Si and are still in progress. There are many elements exists to modify the eutetic Si. Especially in this paper we studied using Ca. Studies to modify the Si using Ca have also been researched a lot, but experiments on mechanical properties are still limited to tensile properties. Therefore, in this paper, we studied not only the microstructural behavior of eutetic Si according to the amount of added Ca but also the high temperature properties of A356 alloy due to the addition of Ca through the Thermo-mechanical analyzer (TMA) and the wear test. The addition of Ca was 100, 300, 500 and 700ppm and the fluidity test was performed using the spiral mold. We also studied the behavior of eutetic Si and microstructure depending on the presence of T6 heat treatment. And analyzed by using OM, SEM and EDS how Ca affected to the microstructure and eutetic Si. To examine dimensional variability at high temperature, TMA analysis was conducted and wear charateristics were analyzed by conducting the wear test after the T6 heat treatment. As a result, when the amount of Ca 100ppm and 300ppm, the microstructure was fine and globular shape and the eutetic Si also refined, which tended to refine the whole microstructure. However, the size of pore and the number of pore was increased when the amount of Ca was 500ppm and 700ppm. The shape of eutetic Si was also changed re-acicular. The fluidity increased gradually as the additive of Ca increased, and the Coefficient of thermal expansion changed greatly from when the additive of Ca was more than 500ppm. The wear test results also showed a significant increased in wear amount when Ca was added more than 500ppm.


En-De Chu
Department of Physics, National Taiwan Normal University, Taipei, Taiwan
Title: Nano-confined water enhanced nanoscale friction on single-layer graphene coated rough silica surface

Biography: En-De Chu is a master student in the Department of Physics, National Taiwan Normal University, Taiwan. His researches are primarily focused on the investigation of the physical properties of novel low dimensional nano-materials by means of Atomic Force Microscopy (AFM) based techniques.

Abstract: Due to its atomic thickness, exceptional mechanical strength, and chemical inertness, graphene has been proposed to be used as protective coatings for miniature moving components in nano-electro-mechanical systems (NEMS). Thus, it is important to understand the frictional properties of graphene-coated surface at the nanoscale. Here, by using atomic force microscopy (AFM) based techniques, namely the Lateral force microscopy (LFM) and Kelvin Probe Force Microscopy (KPFM), we respectively investigated the frictional and surface properties of single-layer graphene (SLG) coated rough silica surface in ambient conditions. Furthermore, during the sample preparation, we purposely leave water molecules confined between the SLG and the underlying substrate in order to understand how the residual water may affect the frictional properties of the SLG surface. Interestingly, we occasionally observed polygonal features on the SLG surface that simultaneously show larger friction and higher surface potential as compared to their neighboring areas. The observed phenomena were attributed to the existence of water molecules confined between the SLG and silica interface. Nano-confined water layers may induce the hole-doping effect in SLG, resulting in a more positively-charged and hydrophilic surface that favors adsorption of ambient water molecules. Therefore, during the friction measurement, nanoscale water meniscus may form within the interstices of AFM tip-SLG contact as a result of the nanoscale capillary effect, leading to larger adhesion and thus stronger friction. In addition, the friction forces were found to have negative and positive trends with the logarithm of sliding velocity inside and outside polygonal regions owing to different surface wettability. As a result, our findings indicate that it is possible to manipulate the frictional properties of SLG coated surfaces by tuning the amount of water sandwiched between the SLG and underlying substrate.


Li Dejun
Tianjin Normal University,Tianjin,China
Title: Modulation ratio induce mechanical properties and high temperature oxidation resistance of ZrB2/ZrO2 multilayers

Biography: Dejun Li is currently a full professor at Tianjin Normal University. He obtained his Bachelor degree in Physics at Tianjin Normal University in 1984, Ms.D degree in Solid State Physics at Tianjin Unversity in 1987, and Ph.D. degree in Materials Physics and Chemistry at Tsinghua University in 1999. He then worked three years as a postdoctoral follow at Northwestern University of USA. Since 1999 he has been focusing on various thin films, coatings, and nano materials for protection, biomaterials, and energy storage. He has authored and co-authored over 150 refereed journal articles and 11 patents.

Abstract: The modulation ratios of ZrB2 and ZrO2 layers (t ZrB2:t ZrO2) from 1:1 to 5:1 under the same modulation period were fabricated by magnetron sputtering system.The effects of different modulation ratios on the structure and mechanical properties of ZrB2/ ZrO2 multilayers were analyzed by means of XRD, SEM,and nanomechanical testing system.The oxidatio weight gain of ZrB2 monolayer film and ZrB2/ ZrO2 nano-multilayer film with different modulation ratio before and after the experiment were determined by weighing method , and the oxidation mechanism was investigated. The results indicated that all multilayers showed high hardness and elastic modulus, and highest hardness and elastic modulus were realized at t ZrB2:t ZrO2 of 5:1. High temperature experiments showed with the decrease of the proportion of ZrO2 layer in the multilayer film, the oxidation weight gain showed an increasing trend, but overall the oxidation resistance of multilayers has been more greatly improved than ZrB2 monolayer. It is concluded that the interface in the modulation structure enhances the mechanical properties of the multilayer film. In addition, the oxidation of ZrB2 films is inhibited by the existence of ZrO2 layer,resulting in an increase in the high temperature stability of the multilayers.


Sergey Sergeenko
Platov South-Russian State Polytechnic University, Russia
Title: Powder materials based on mechanically activated charges

Biography: 1976 mechanical engineer, NPI; 1983 Degree, Candidate of Technical Sciences in the specialty Materials Science in Mechanical Engineering; 1991 academic title, senior researcher in powder metallurgy and composite materials; 2008 honorary title "The Best Inventor of the Don"; 2014 honorary title "Honorary Worker of Higher Professional Education of the Russian Federation"; 2018 Diploma of the Ural Prize "Metalloved of the Year 2018", the winner in the nomination "Metal Physics"; since 1988 Leading Researcher, Associate Professor, Professor, Deputy Dean of the Faculty of Mechanics of the Platov South-Russian State Polytechnic University (NPI) for Research; scientific supervisor of six candidates of sciences in the specialty Powder Metallurgy and Composite Materials; supervisor of four masters of foreign citizens in the direction of metallurgy; The research results are published in 30 articles of Scopus, protected by 32 patents.

Abstract: Mechanical treatment of powder blends in high-energy mills is characterized by the formation of a new surface and an increase in the concentration of defects. The accumulation of energy in the form of dislocations, vacancies and interstitial atoms in a solid makes it possible to reduce the activation energy of the subsequent chemical transformation and to accelerate diffusion processes. Scientific and technological bases for the production of mechanically activated powder materials based on Al [1–7], Ni [8, 9], Cu [10–15], and Fe [16] have been developed at the SRSPU (NPI). The hereditary influence of the processes of agglomeration-dispersion during the mechanical activation of the charge on the laws of consolidation during the thermomechanical processing of the powder material and the formation of physical and mechanical properties is established. Based on the conducted research, an improved technology has been developed for producing hot-compacted powder composite material Al-SiC (10% wt.) With an increased hardness of 370 HV, including mechanical activation of the mixture in a saturated aqueous H3BO3 solution, cold pressing, short-term heating in air and subsequent hot compaction. In the process of mechanical activation, the formation of large (253 mm) agglomerates consisting of small (64 mm) composite particles is observed. Laser analysis (Microtrac Bluewave S3500) of the particle size distribution of the powder particles that make up the agglomerates, established a bimodal distribution. At the same time, in the activated charge, nano- and ultrafine (10–100 nm) composite particles that make up the agglomerates were found. Phase analysis (X-ray diffractometer ARL X’TRA Thermo Fisher Scientific) of the charge did not reveal the formation of A2O3 due to cladding with boron oxide during the mechanical activation of the powder particles, and during hot compaction, the release of the hardening phase (Al2O3)1,333 was established. X-ray microanalysis (EDAX Genesis 2000 XMS 30 microanalysis system, coupled with SEM FEI Quanta 200) found that the composite particles that make up the agglomerates of the activated mixture contain Al, C, O, and Si. Composite particles consist of Al particles whose surface is animated by uniformly distributed SiC particles. An analysis of the SEM images of the particles showed that the fine SiC particles are uniformly distributed over the volume of the Al matrix containing even large inclusions of SiC. Mechanical activation and hot compaction leads to an increase in the half-width of the diffraction profile of the lines for Al and SiC, ensuring the hardening of the hot compacted composite material.


Adalberto Alejo-Molina
Instituto de Investigación en Ciencias Básicas y Aplicadas, Mexico
Title: Testing the Validity of Simplified Bond Hyperpolarizability Model

Biography: Adalberto Alejo-Molina is a CONACYT research fellow by the Center for Engineering and Applied Sciences in the Autonomous University of the State of Morelos (CIICAp, UAEM), Mexico. His lines of research are Harmonic Generation in Crystals, Photonic Crystals, Solitons and Plasmons. He is referee for Journal of the Optical Society of America B, Optics Communications, Optics Express, among others. He is member of the Mexican Physics Society, Mexican Academy of Optics (AMO) and the Optical Society of America (OSA).

Abstract: In this work, we discuss a way to compare the results between simplified bond-hyperpolarizability model (SBHM) and the standard result obtained via the group theory crystallographic susceptibility tables for calculating second harmonic generation. Since SBHM was originally proposed by Aspnes and his group in 2002 [1, 2], different corrections [3-5] and details that justify its validly has been pointed [6, 7]. Our proposal is based in the fact that for crystals with C6v symmetry, in particular GaN and ZnO, group theory predicts several independent elements in the susceptibility tensor. However, SBHM model only uses one, the hyperpolarizability of the bulk, for the susceptibility tensor calculated through this phenomenological model. We calculated the nonlinear polarization response for second and third harmonic generation and with it the effective electric field in the far-field approximation, for the p- and s- polarizations for the SBHM and using only the susceptibility tensors given by group theory in the crystallographic tables, we compare both results and suggest an experimental way to test the validity of SBHM.


Dong-Hyun Kim
Chungbuk National University, Cheongju, Korea
Title: Ferromagnetic resonance in the Sr2FeMoO6 compound nanopowders

Biography: 2004-2006 Postdoc Researcher, Dept. of Physics, KAIST, South Korea
2004-2006 Postdoc Researcher, Material Science Division, LBNL, USA
2006-Present Assistant, Associate, Full Professor, Dept. of Physics, Chungbuk National University, South Korea
2018-2019 Visiting Scientist, Material Science Division, LBNL, USA

Abstract: The Sr2FeMoO6-δ (SFMO) compound, which has been under intensive investigations for the last years, has a number of physical characteristics being attractive for the spintronic applications. The SFMO is a ferrimagnetic with the almost 100 % degree of the spin polarization at temperatures lower than the Curie one (Тс – 410 - 430 К) in the main magnetic state. It has a metallic type of conductivity and tunneling magnetoresistive, reaching up to 45% [1]. In this work, single-phase SFMO powders with the average grain size 80-90 nm and a different degree of the Fe/Mo cations superstructural ordering (Р) were synthesized by the modified sol-gel technique [2]. The Fe and Mo cations superstrctural ordering degree has been regulated by an additional thermal treatment of the powders. As a result, three sample series with Р = 67%, 81% and 89% have been obtained [3]. Investigations of the SFMO have been carried out for the first time by the ferromagnetic resonance (FMR) method, which is an effective instrument of the studies of magnetic inhomogeneities. The measurements were carried out using the Brüker Ele Xsys E-500 spectrometer on the microwave frequency 9.45 GHz in the temperature range 120 - 440 К and the constant magnetic field with induction up to 1.4 Т, perpendicular to the electromagnetic wave. The FMR spectra have been obtained in the form of the field dependences of the first derivative of the electromagnetic wave absorption on the magnetic field, dP/dB(B), for a number of temperature values. According to the positions of maxima and minima of the dP/dB, the resonant peaks of the electromagnetic wave absorption are practically symmetrical, indicating that all the SFMO samples series are the integrated granules system with the unidirectional magnetization on the field. It is obvious from the FMR data, presented as the dP/dB maximum temperature dependences for the SFMO powders with various Fe/Mo cations superstructural ordering values, that the signal amplitude strongly depends on Р value with proportionality. This is clearly explainable: the resonant signal amplitude increases with the rise of the ordering in the cation sublattice. Here, the presence of maxima in the temperature range 350-370 К is mostly interesting; this fact evidences the existence of two magnetic states (the ferrimagnetic one and the antiferromagnetic one), which are competiting in the area close to the Curie temperature


Young Hwan Ryu
Seoul Medical Center, South Korea
Title: Medical Institutions of the Seoul Metropolitan Area’s Internal Air Radon Atmostphere Emission: Suggestions for Density Measurement and Improvement

Biography:

Abstract: We have started this study in an attempt to measure facility spaces’ Radon density andminimize Radon damages to human health accounting formeasurement values. The subject of this study is a general hospital situated within the Seoul metropolitan area, the Seoul Medical Center. The Radon density measurement points were dispersed as following for comparison among spatial categorization: 17 spots within office areas (places where only hospital employees occupy), 25 spots within patients’ waiting area (occupied by employees, patients, patient caretakers, general passerby), 22 spots within treatment areas (occupied by employees or patients). For comparison among building levels, 10 places were picked within the basement area (5 on the first basement level, 1 on the second basement level, 2 on the third basement level, 2 on the fourth basement level), 54 places above ground (25 on the first floor, 27 on the second, 2 on the third). For comparison based on the factor of window existence,21 spots without windows and 43 spots with windows were compared. Measurement was carried out for the duration of four months by Alpha track detectors with the removal of LR-115 tapes.These detectors are fixed to the wall with a one meter length string hanging from a half-circle shaped link fixed upright at a right angle on the ceiling at the center of the measurement area.As a manual detector, for Alpha track detector measurement to be properly conducted, it should be used under minimized circumstantial changes from the usual status quo for the duration of measurement. Study collaborators have kept the environmental factors constant while measuring Radon density, with indoors detectors being comprised of two types, passive and active detectors. These two types could be differentiated apart by their electric power source. Passive detectors are easier to maneuver and are more economical in their costs than their active counterparts. Few demerits persist, however, in that passive detectors have more difficulty achieving prompt long term measurements and are more prone to lowered reliability in their measurements due to external environmental factors. Despite these shortcomings, for its relative low costs and efficiency, collaborators have decided on using Alpha track detector LR-115 device for the purpose of this study.The mean Radon concentration level of the 21 places with windows was 58.00 Bq/m3, with the 43 places without windows’ mean level being 62.93 Bq/m3. The mean difference of approximately 5 Bq/m3 with windowed places being lower in Radon concentration levels were nonsignificant (p > 0.05).The reason why lower Radon density was measured in windowed areas could be postulated to be due to airing and emission of Radon from measured indoors to outdoors. In the comparisons between workspace categorizations, the mean Radon density level of the17 places within office areas (occupied only by hospital employees) was 58.18 Bq/m3,a mean of 64.50 Bq/m3in 22 patient waiting areas (occupied by employees, patients, caretakers, and passersby), and a mean of 61.31 Bq/m3 was achieved in 22 treatment areas.Radon density level was ranked from highest to lowest from office areas, treatment areas, and patient waiting areas. There were, however, no statistical significance achieved among the three spatial categorizations (p > 0.05). We could postulate lower Radon level was achievable through frequent airing from multiple windows. Comparisons between floor levels led to the result of mean of 55.90 Bq/m3 in the 10 areas in the basement levels, and mean of 62.31 Bq/m3in the 54 areas in the above ground level floors. While not achieving statistical significance (p > 0.05), Radon levels were measured to be 7 Bq/m3 lower in the basement areas compared to the above ground levels.Based on these results, we believe reducing lung cancer inducing Radon density by appropriately measuring and controlling radon concentration levels would be conducive to lowering radiation exposure to on facility employees, patients, and caretakers.


Wenjiang Li
Tianjin University of Technology, Tianjin, China.
Title: Synthesis of hollow β-In2S3 nanoparticles and its adsorption property

Biography: Professor Wenjiang Li is a professor at the Department of New Energy Materials and Device, Tianjin University of Technology (Tianjin, China). His research interests: Synthesis of serious kinds nano materials and study their applications; Using complex nano semiconductors with controllable band gap in photovoltaic cells, electrochemical sensor and photocatalyst

Abstract: Water pollution, especially of dye-contaminated water linked to the large-scale development of the textile global industry, has become a substantial matter of concern trigging the research on strategies to remove dyes from contaminated water worldwide. Till now, various chalcogenides with different morphologies (such as nanotubes, nanorods, nanowires, nanosheets and hollow nanospheres) have been synthesized and used as highly efficient adsorbent/photocatalysts for the removal of organic dyes. As a typical III-VI chalcogenide, the stable and non-toxic β-In2S3 (up to 420 °C) with a defect spinel lattice, a relatively narrow band gap of 2.0-2.4 eV and a negative potential (approximate -0.9 eV vs. NHE) has been widely studied in the high-efficient adsorbent/photocatalyst.Owing to the unique physicochemical properties, high density of surface active sites and abundant inner spaces, it is of increasing interest for the synthesis of hollow nanostructures to be used as delivery vehicles, heterogeneous catalysis and photocatalysis. However, there are few reports on the control of the morphology of In2S3 nanostructures by ion exchanging method. Here, hollow β-In2S3 nanoparticles (NPs) with higher surface area were synthesized via an anion exchange process under a hydrothermal condition. The adsorption capacity of the hollow β-In2S3 NPs were evaluated using Methylene blue (MB) as a model probe. The fast absorption and large adsorption capacity (ca. 157.99 mg/g within 60 min) for MB in the solution was associated to the high specific surface area (324.6 m2/g) of the β-In2S3 NPs and the electrostatic interaction between the β-In2S3 and MB molecule, indicating that adsorption approach plays a crucial role for removing MB from solution. The highest removal efficiency of 100 mg/L of MB solution reached 73.4% under dark for 60 min, and further increased to 92.2% after visible light irradiation for 180 min. The Langmuir isotherm model and pseudo-second-order kinetics were used for the model of the adsorption behavior of MB onto the In2S3 sample. The as-prepared hollow In2S3 NPs might be anticipated to be used in dye wastewater treatment.


Wenjiang Li
Tianjin University of Technology, Tianjin, China.
Title: Preparation of hollow β-In2S3 nanoparticles for efficient removal of organic pollutants

Biography: Dr. Wenjiang Li is a professor at Tianjin University of Technology (Tianjin, China), one of the primary members of New Energy Materials and Device. He has published more than 80 SCI/EI articles and more than 15 patents. His expertise covers the following aspects: Synthesis of serious kinds high-performance functional nanomaterials; Nanometre modification, and green chemistry; Using complex nano semiconductors with controllable band gap in photovoltaic cells, electrochemical sensor and photocatalyst. He got his Ph.D degree from Jilin University in 2001, and worked as post-doctor at HongKong University of Science & Technology (HKUST) and Technology University of Delft (TU Delft).

Abstract: Recently,various chalcogenides with different morphologies (such as nanotubes, nanorods, nanowires, nanosheets and hollow nanospheres) have been synthesized [1-3]. Owing to the unique physicochemical properties, high density of surface active sites and abundant inner spaces, the synthesis of hollow nanostructures has attracted much attention in delivery vehicles, heterogeneous catalysis and photocatalysis [4]. Here, a facile strategy was designed to synthesize hollow β-In2S3 nanoparticles (NPs) via a hydrothermal route without either surfactant or sacrificial agent. The formation mechanism of hollow β-In2S3 NPs was illustrated in detail: Due to the different solubility product constant (Ksp), the OH- anions of colloidal In(OH)3 NPs, generated from the hydrolysis of In3+ in aqueous solution with an assistance of ultrasonic treatment, can be replaced by S2- anions, resulting in the formation of hollow structured In2S3 NPs. The structure, morphology, chemical composition, and optical properties of as-obtained In2S3 NPs were studied by a series of characterizations, such as X-ray diffraction (XRD), field-emission scanning electron microscope (FESEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS) and UV-vis diffuse reflectance spectra (DRS). The adsorption property of the hollow β-In2S3 NPs was evaluated by the removal of Methylene blue (MB). The superior adsorption capacity (ca. 158.0 mg g-1 in 60 min) of In2S3 NPs for MB dye was considered to be due to the high specific surface area ( 324.6 m2 g-1) of In2S3 and the electrostatic interaction between In2S3 and MB. Based on a good fitting with the Langmuir isotherm model and pseudo second-order kinetics, the adsorption behavior of MB on In2S3 can be considered mainly to be a monolayer adsorption process and is related to the electrostatic interaction.The as-prepared hollow In2S3 NPs might be anticipated to be used in dye wastewater treatment.