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Program Schedule


Session Introduction

Kun Tang
School of Electronic Science and Engineering, Nanjing University, China
Title: The photo-sensitization of zinc oxide by the localized-surface-plasmon-generated hot electron tunneling from the nanostructured titanium nitride nanodisk array


Abstract: Wide band gap oxide semiconductors, like TiO2 and ZnO, are regarded as excellent photocatalysts, which could be applied to solving the problems regarding atmospheric and water pollution. However, due to their wide band gaps, only photons with energy >3 eV can be utilized. More practically, only a very small amount of solar energy could be used. (e.g. ZnO ~4%) Therefore, in order to realize solar photocatalysis, people usually employ doping and coating of photo-sensitizer to improve the ability of capturing the photons with sub-band-gap energy. However, these kinds of processes would lead to severe aging problem, which sharply reduces the stability and lifetime of the photocatalyst. Another strategy to improve the solar energy absorption efficiency is to utilize the hot electron absorption generated by the stimulation of the localized surface plasmon (LSP) from the nanostructured metal and further couple the nanostructured metal to the wide band gap oxides. In order to increase the utilization efficiency of solar energy, a wide band gap energy absorber is required. Considering only the material part, the absorption band from the LSP of gold and silver lies within the blue-green visible region, which could significantly improve the absorption of visible light. Gold-oxides and silver-oxides nanocomposites have been thus extensively investigated. Recently, an alternative material, titanium nitride (TiN), has attracted interest as a plasmonic material in visible and near infrared (NIR) bands. Theories have suggested a wider absorption band as compared to silver and gold. However, no work has studied the performance of TiN-oxides nanocomposite for the application of photocatalysis, for example. In this paper, we have found the plasmonic absorption of nano-patterned TiN nano-disk array. Then, we have integrated the nano-structured TiN with the ZnO to demonstrate the improved solar absorption efficiency. The mechanism of the device has been investigated as the hot electron, generated from the TiN by the efficienty LSP decay, tunneling into the ZnO. Experimentally, TiN and ZnO materials are deposited by a radio-frequency magnetron sputtering equipment. The properties of the TiN and ZnO have been studied by X-ray Diffraction, Hall effect measurement, and spectroscopic ellipsometry. The resistance of our TiN material can reach below 10-5 Ohm*cm, which guarantees the LSP wavelength into visible region. The SE data also suggest metallic property (ε’<0) of the TiN in the visible and NIR bands. The TiN nano-disk array has been fabricated by depositing TiN on an anodized aluminum oxide (AAO)- masked ZnO template, followed by a lift-off process to remove the AAO mask. (Figure 1) The LSP resonance at visible band has been confirmed by measuring the nano-patterned TiN samples with a micro-transmittance and reflectance measurement system. The resonance wavelength could be tuned by varying the diameters of the TiN nanodisk array. These results have been confirmed by the FDTD simulation of the same nano-structure. Using the nano-TiN array on sapphire, we further deposit ZnO and have fabricated two ohmic contacts on the zinc oxide film. The photo-electro response by varying the wavelength of the external light source have been carried out. (Figure 2) The solar energy conversion efficiency has also been tested on this device. Comparing with gold for the same pattern, the TiN-ZnO hybrid device may have better performance. This study has demonstrated the potential of TiN, with unique advantages like extremely high melting point, outstanding mechanical and chemical stability and cheap, as an alternative to noble metal in the application of solar harvesting devices.

Chanderbhan Chotia
University Campus, Khandwa Road, India
Title: Thermoelectric Properties of Polyol Method Synthesized Cu2Te Nanoparticles

Biography: I completed my M.Sc. from Govt. College of Ajmer. Now, I am doing PhD from UGC-DAE CSR, Indore in thermoelectric field. My nature always forces me to become much more than a ‘the academic text book content driven wonk’. I found that the curiosities rendezvous every moment; since, my observations go over the everlasting series of natural phenomena caused by my inherent nature of continues questioning and simulating them. my thoughts seem to be manipulative over the existing structure. But, I felt differently.

Abstract: Crystalline, morphological and dynamic light scattering studies of copper telluride nanoparticles (NPs) synthesized successfully using diethylene glycol have been carried out. X-ray diffraction (XRD) measurements confirm phase purity and hexagonal crystal structure of the NPs. The crystallite size evaluated using Scherer formula is 34 nm. Field emission scanning electron microscopic study confirms the disc-like shape of average size 45 nm NPs, slightly bigger than that of Scherer size. This is 850 nm from dynamic light scattering measurements deionized water (DIW) associated with a zeta potential of -17.74 mV indicating instability in DIW. These NPs exhibit room-temperature Seebeck coefficient (S) and electric conductivity (σ) of 10.5 μV/K and 1166 S/m, respectively, which result in a power factor (S2σ) of 0.13 μW/(mK2). Positive sign of S is indicative of holes as the dominant carrier in the material. Further, this material exhibit metallic behavior in the temperature range 5 K – 325 K.

Soo Xiang Yun Debbie
Institute of Materials Research and Engineering (IMRE) Agency for Science, Technology and Research (A*STAR) 2 Fusionopolis Way, Innovis, #08-03, Singapore
Title: PEDOT:PSS doped with carboxylic acid-modified carbon nanotube for improvement in electrical conductivity, surface morphology and thermoelectric performance

Biography: Debbie graduated with a Bachelor of Science (Hons) (Chemistry) from the National University of Singapore in 2015. She joined the Institute of Materials Research and Engineering in that same year, and has been researching on Thermoelectric Materials with PEDOT based materials as her main focus for 3 years. Her current research interests are thermoelectric materials, conjugated polymers and small molecule dopants.

Abstract: Thermoelectric (TE) field has gained greater attention over the years as it is able to convert a thermal gradient to electrical energy and vice versa, pushing TE devices into the list of green energy sources. The TE performance can be evaluated via the dimensionless figure of merit, ZT, where ZT = σS2T/k, where T is the absolute temperature, S is the Seebeck coefficient, σ is the electrical conductivity, and k is the thermal conductivity of the material, where a higher ZT is more favourable. Inorganic materials such as Bi2Te3, SiGe and PbSeTe [1] have been widely studied, and achieved a high ZT of about 2 [2]. However with their disadvantages of scarcity, toxicity and non-flexibility, conducting polymers have become the new alternative as they are in large abundance, have low thermal conductivity, and the electrical conductivity can be tuned depending on its structure [3]. PEDOT:PSS is one of the conducting polymers that are extensively studied with various dopants and post-treatments [4], where DMSO treated PEDOT:PSS currently yields the highest ZT of 0.42 for a p-type polymer at room temperature [5]. To further improve the TE performance via conductivity performance, carbon nanotubes (CNT) can be added to the conducting polymer matrix to increase the number of electrical pathways [6]. In our study, we have doped commercial PEDOT:PSS (PH1000 from Heraeus Clevios) with CNT that is modified with carboxylic acid on the surface (CNT-COOH). It was noted that unmodified CNT has poor dispersion in aqueous medium which PEDOT:PSS was dispersed in. Thus to improve the morphology and uniformity of the film, CNT surface modification was carried out and added to PEDOT:PSS to enhance the dispersion and consequently conductivity. PEDOT:PSS was doped with different concentrations of CNT-COOH, and drop casted on a glass substrate. The films were subjected to electrical conductivity tests via the 4-point probe method, Seebeck coefficient measurement via our in-house Seebeck machine, thickness measurement via the profilometer and SEM for morphology studies. The films showed improvement in conductivity compared to pristine PEDOT:PSS, and better morphology compared to doping with unmodified CNT.

Stanislav Rusz
VSB – Technical University of Ostrava, Ostrava – Poruba, Czech Republic
Title: Influence of SPD process on structure and mechanical properties Cu0,5Cr alloy

Biography: Occupation or position held: Professor Main activities and responsibilities: Technology of forming, unconventional technologies of forming, development of technologies for production of materials with ultrafine-grained structure, formability of medium and high carbon steels at conditions of super plastic state, formability of powder steels, orbital forming, die forging, wire drawing, bulk forming. Name and address of employer: VSB – Technical University of Ostrava, Faculty of Mechanical Engineering, Dept. of Mechanical Technology, 17. listopadu 15, 708 33 Ostrava-Poruba, Czech Republic

Abstract: Several SPD techniques have been successfully applied to produce bulk UFG materials. UFG materials are quite attractive due to their ultrahigh strength, more than twice of the coarse grained equivalents. The term “ultrafine grained structure” is referring to nanostructure with grain sizes less than 100 nm, and sub-microcrystalline structure with grains between 100 and 1000 nm. Plastic deformation generates high dislocation density. The dislocations are usually arranged in specific configurations, which depend on the crystalline structure of the material. This concerns the dislocation walls, accumulation at the barriers of slip planes (shear bands), dislocation loops and dislocation cells, and more. The interaction of dislocations leads to the formation of sub grains with low-angle boundaries [1, 2]. Cu alloys of non-ferrous metals on the basis of Cu are currently used in the transport and automotive industries. The SPD process can fundamentally affect its mechanical and physical properties, especially the magnitude of electrical conductivity. At the VSB - Technical University of Ostrava, Faculty of Mechanical Engineering, a prototype forming device has been developed to achieve the refinement of the structure in metallic materials and thus to influence the mechanical and physical properties (DRECE - Dual Rolls Equal Chanel Extrusion (SPD)). The Cu0,5Cr alloy in the inlet rolled and in the second case the annealing state was formed by the SPD process. The influence of the number of passages through the forming device on the microstructure and the mechanical properties of the alloy were evaluated. EMSD metallographic analysis showed a significant percentage of low-grain boundaries of Cu05, Cr in the rolled state (41%) relative to the annealed state (13%). An important knowledge is the demonstrated influence of grain size and electric conductivity through the SPD process.

Mohammad Hadi Dehghani
Tehran University of Medical Sciences, School of Public Health, Department of Environmental Health Engineering, Tehran, Iran
Title: Removal of methylene blue dye from aqueous solutions by a new chitosan/zeolite composite from shrimp waste: Kinetic and equilibrium study

Biography: Professor Dr. Mohammad Hadi Dehghani is a Full Professor at the Tehran University of Medical Sciences, School of Public Health, Department of Environmental Health Engineering, Tehran, IRAN. His scientific research interests include the Environmental Health Science and Nanotechnology. He is the author of various research studies published at national and international journals, conference proceedings and Head of several research project at the TUMS. He has authored 8 books and more than 150 full papers published in peer reviewed journals. He is an editorial board member and reviewer in many internal and international journals and is member of several international science committees around the world.

Abstract: The adsorption of methylene blue dye (MBD) from aqueous solutions was investigated using a new composite made up of shrimp waste chitosan and zeolite as adsorbent. Response surface methodology (RSM) was used to optimize the effects of process variables, such as contact time, pH, adsorbent dose and initial MBD concentration on dye removal. The results showed that optimum conditions for removal of MBD were adsorbent dose of 2.5g/L and pH of 9.0, and initial MBD concentration of 43.75mg/L and contact time of 138.65min. The initial concentration of dye had the greatest influence on MBD adsorption among other variables. The experimental data were well fitted by the pseudo-second order kinetic model, while the Freundlich isotherm model indicated a good ability for describing equilibrium data. According to this isotherm model, maximum adsorption capacity of the composite was 24.5mg/g. Desorption studies showed that the desorption process is favored at low pH under acidic conditions.

Qiang Zhu
Institute of Materials Research and Engineering, A*STAR (Agency for Science, Technology and Research), 2 Fusionopolis Way, Innovis, #08-03, Singapore
Title: Polymer Composites of PEDOT:PSS and Silver Nanostructures for Thermoelectric (TE) Applications


Abstract: As a representing conducting polymer, PEDOT:PSS has been widely studied for various electronic applications, such as thermoelectric applications. Currently, DMSO has been used as an additive to PEDOT:PSS to improve the electrical conductivity up to 1000 S/cm. However, the Seebeck coefficient is usually <30 µV/K, which is not high enough for thermoelectric power output. The reason is attributed to the trade-off relationship between Seebeck coefficient and electrical conductivity. In order to solve this issue, some metallic nanostructures can be added to PEDOT:PSS to improve its Seebeck coefficient. The hetero-junctions between metallic nanostructures and PEDOT:PSS can be used for energy filtering, which could potentially enhance Seebeck coefficient. In this presentation, silver nanoparticles (Ag NPs) and silver nanowires (Ag NWs) were synthesized and added to PEDOT:PSS to investigate the effects on thermoelectric performance. However, when Ag nanostructures were employed, the aggregation of nanostructures was observed. In order to improve the dispersing property of Ag nanostructure in PEDOT:PSS, N-methyl pyrrolidone was added to improve the uniformity of polymer composites. As a result, it was found that Ag NPs and Ag NWs can significantly improve the electrical conductivity of PEDOT:PSS up to 3000 S/cm. Even though the Seebeck coefficient was decreased to 13 µV/K for Ag NPs, the overall power factor was improved to 50 µW*m-1*K-2. Meanwhile, the corresponding mechanism was also studied in this presentation.

Home Economics Department, Faculty of Specific Education, Alexandria University, Alexandria, Egypt
Title: In vitro and in vivo Antibacterial Activity of Chitosan-Monoterpenes Nanoparticles for Minced Meat Preservation

Biography: My name is Samar Mohamed Shawir from Alexandria, Egypt I was achieved the BSc in food and nutrition, In addition, I have a MSc degree with title “Effect of Adding Biopolymer Chitosan Nano-Formulations on Quality and Preservation of Minced Meat” in Nutrition and Food Science, Home Economics Department, Faculty of Specific Education, Alexandria University, Egypt. Now I am a assistant teacher in Alexandria University. I am interested in the field of Nanotechnology and food science and I have some publication in this area. I participated in Biovision Alexandria 2018, Poster Session “Preparation and characterizations of chitosan-essential oil nanoemulsions”

Abstract: A biopolymer chitosan and natural terpenes have attractive applications in food technology because of their biodegradability, biocompatibility, and nontoxicity to mammals. This study focuses on the use of nanotechnology for preparing of chitosan-monoterpenes nanoparticles (Ch M NPs). Four monoterpenes; limonen (M1), linalool (M2), minthol (M3) and thymol (M4) were used to prepare Ch M NPs. The characterization and antimicrobial activity of prepared Ch M NPs were evaluated. Scanning electron microscopy showed that the shape of Ch M NPs was spherical and the mean of particle size ranged between 33.67 to 54.19 nm. Zeta potential values ranged between -0.03 to -0.169 mV. The estimated MIC values of chitosan (Ch), monoterpens (M), and Ch M NPs against Escherichia coli ATCC 8739, showed that M1 was the most active MIC = 350 mg/L followed by M4 MIC = 450 mg/L and M3 was the lowest active MIC =1600 mg/L. Ch M1 NP was the most active MIC=180 mg/L followed by Ch M2 NP and Ch M4 NP MIC =200 mg/L While, Ch M3 NP was the lowest active nanoparticles MIC =450 mg/L. In vivo study of monoterpenes and Ch M NPs against E.coil in minced beef meat showed that limonene (M1) was active (79.33 and 40.00 ×104cfu/g) and Ch M1 NP showed great antibacterial effect (18.17 and 8.33×104cfu/g) at 1000 and 2500 µg/g, respectively compared with the controls (˃300 and 243.67×104cfu/g). Moreover, the antibacterial effect of Ch M NPs was greater compared with crude monoterpenes. Furthermore, significant differences in the antibacterial activities were observed between the two tested concentrations. Meanwhile, the antibacterial activity of most treatments reduced with storage time (ten days at 4oC). The results suggest that Ch M NPs could be used in minced meat preservation as antimicrobial agents and for shelf-life extension.

University of Lome, Lomé, Togo,
Title: Studies on the Photocatlytic activity of Metal Oxide and their composite for dye degradation application


Abstract: In this work, ZnO nanorods and Graphene-ZnO-PdO nanocomposite was synthesized through hydrothermal method. Crystallinity of the materials has been studied using X-ray diffraction (XRD) and morphology was analysed throughField Emission Scanning Electron Microscopy (FE-SEM) and Transmission electron microscopy (TEM) techniques. The synthesiszed nanomaterials are used for the photocatalytic degradation of Methylene Blue (MB) under UV-light illumination (365 nm) and the results are compared with commercial ZnO material. Graphene-ZnO-PdO nanocomposite exhibits higher degradation of MB under UVlight illumination than ZnO nanorods and commercial ZnO material. These nanocomposite materials can be used for degradation MB in industrial waste water treatment.

Carlos Alberto Huerta Aguilar
Universidad Politecnica del Valle de Mexico, 54910, Tultitlan, Mexico
Title: Fluorescent biomarker: Detection of cysteine and cytosine in aqueous medium using thiophene based organic nanoparticles decorated with Au NPs

Biography: Carlos Alberto Huerta-Aguilar is professor at Polytechnic University of Valley of Mexico. He has acquired vast experiences (Indian Institute of Technology (IIT), India, and Texas A&M University) in the application of nano-chemistry in different fields of research. He has published more than 25 papers in specialized journals and has presented the research findings in the American Chemical Society Meetings. Pandiyan Thangarasu is currently professor at the School of Chemistry, National Autonomous University of Mexico (UNAM), Mexico. His fields of interests range from visible light photocatalysis to environmental and toxic effect of nanomaterials. He has published more than 100 research papers after obtaining his PhD (1993) from Bharathidasan University, India.

Abstract: Development of luminescence materials as chemo-sensor for the detection of anionic, cationic or neutral molecules in environmental/biological samples attracts a great attention and is a growing research field. Among novel materials, supra-molecules are being considered for specific binding of analytes, since these compounds can exhibit distinct spectral behavior after binding to guest molecules to perform as chemo-sensors. Since most of organic molecules have low solubility in water, its conversion to Organic Nanoparticles represents a simple way to disperse them in water: although organic nano-particles (ONPs) are easily biodegradable in most cases, they are generally unstable, involve quick aggregation, and loose unique spectral features [6-7]. To overcome these drawbacks, some capping/complexing agents are considered in order to avoid the aggregation as well as to increase the stability. In the present work, thiophene containing Schiff’s base N,N´-bis(thiophene-2-ylmethylene)thiophenemethane was synthesized and later applied as fluorescent probe for recognition of specific biomolecules in aqueous media (cysteine and cytosine), showing no interference from close related molecules such as guanine, uracyl, NADH, NAD, ATP and adenine. Size and morphology of prepared particles was determined by Transmission Electron Microscope (TEM) and Dynamic Light Scattering. Results show AuNPs embedded within a low-density matrix of organic matter (ONPs) that increases stability of ONPs and its fluorescent emission in a wide pH range. Limit of Detection (LOD) for cysteine and cytosine was determined to be 2.12 nM and 258.36 nM respectively. In the interaction of cells with Au-ONPs, cysteine does not exhibit fluorescence upon excitation at 405 nm in con-focal microscope in contrast to cytosine which yields to strong fluorescence images. Moreover, Saccharomyces cerevisiae culture in presence of Au-ONPs showed internalization of nanoparticles and obtained cells were used as biomarker recognize cysteine and cytosine.

Yesenia Scarlette Garcia Gutierrez
Universidad Nacional Autónoma de México
Title: Visible light accelerated photo-catalytic oxidation of ciprofloxacin by TiO2-Ag under visible light

Biography: Yessenia Scarlette García Gutiérrez is a master student at the School of Engineering, National Autonomous University of Mexico (UNAM), Mexico. She obtained her professional degree in Chemical Engineering (2017) from UNAM, and has published 1 research paper. She is currently working on the application of nanomaterials for environmental remediation.

Abstract: Developing of photo-catalytic materials is an interesting topic from the environmental points of view. In the present work, TiO2 and its hybrid TiO2-Ag NPs were prepared and characterized by XRD, TEM, HR-TEM, and XPS. Moreover, its photoactivity and bandgap have been determined by solid state UV-Vis spectrophotometry. Photo-catalytic degradation of ciprofloxacin by TiO2-Ag NPs was studied under visible light by measuring the changes in fluorescence emission (420-440 nm, Ex.@365nm). From these studies it was observed that TiO2-Ag NPs allows a considerable oxidation of ciprofloxacin that follows a first order kinetics. In addition, the effect of pH, and solvents over reaction rate were also analyzed. Furthermore, a DFT-PBE approach was used to optimize and determine physicochemical properties of TiO2 anatase crystal cell along with modified TiO2 modified with an Ag cluster. From these studies, the performance of band-gap and its photoactivity was determined, where results show that there exists an alteration in Density of States (DOS) upon addition of Ag NPs, reducing the band gap. This is consistent with solid state reflectance study where a broad band is being observed. Finally, a mechanism of Ciprofloxacin oxidation is proposed after analyzing intermediates formed during the photo-catalytic degradation.

Eduardo Daniel Tecuapa Flores
Universidad Nacional Autónoma de México
Title: Alpha-(2-hydroxy-5-methylphenylimino)-o-cresol as nano-chemosensor for simultaneous recognition of Al3+ and Zn2+: Electrochemical and cell-imaging studies.

Biography: Eduardo Daniel Tecuapa Flores graduated (Master) from Environmental Engineering from the UNAM, and expertized in the detection of endocrine disrupting chemicals in water and its evaluation of estrogenic activity. He is currently doing his PhD at UNAM, developing novel chemo-sensors for the detection of chemical species in the environment as well as the electrochemical application of nanoparticles for the degradation of drugs in water.

Abstract: Chemo-sensing of metal ions, anions, and neutral molecules in biological system becomes an essential tool to monitor the physiological functions. Due to the high levels of sensitivity, fluorescent chemo-sensors have been widely applied in different research fields such as biology, physiology, pharmacology, and environmental science; in particular, they can be applied in sample analysis and also in vivo imaging. In this work, alpha-(2-hydroxy-5-methylphenylimino)-o-cresol is used as a chemo-sensor for the simultaneous detection of Al3+ and Zn2+, and the results were compared with those of Organic Nanoparticles (ONPs). After analyzing metal binding test, it was seen that alpha-(2-hydroxy-5-methylphenylimino)-o-cresol detects efficiently both Al3+ and Zn2+, observing that there is no interference from coexisting metal ions such as Cd2+, Ni2+, Cu2+, Sr2+, Mg2+, Co2+, Fe3+, K+, Al3+, Sm3+, Ag+, Na+, Ba2+, Cr3+, Zn2+ and Mn2+. Importantly, the fluorescence intensity for alpha-(2-hydroxy-5-methylphenylimino)-o-cresol is enhanced if Al3+ is added to ligand, performing as fluorescence-ON chemo-sensor. The electrochemical behavior of the donor (ligand) was analyzed in order to see its performance in solution as well as in the surface of electrode. Significantly, the sensing of Al3+and Zn2+ in the real samples like living cells was performed, observing that alpha-(2-hydroxy-5-methylphenylimino)-o-cresol acts as fluorescent probe for Al3+ ion in living systems.

Citlalli Adriana Rios Gonzalez
Universidad Nacional Autónoma de México
Title: Band gap Energy determination for SiO2/TiO2-Graphene Oxide nano composites as visible light harvesting material

Biography: Citlalli Rios has received her BSc (2018), UNAM, and she is a Master´s student of the Environmental Engineering program at The National Autonomous University of Mexico (UNAM). She has previously worked on Carbon nano structures and their applications, for which she has been awarded with a Scholarship from The National Council on Science and Technology (CONACYT) as Research Assistant (2013).

Abstract: Study of TiO2 is of great interest as photocatalytic material although there are some difficulties for considering it as a visible light driven catalyst (large band gap of 3.2 eV, and fast recombination of the electron-hole pair). It has been reported that crystallinity, crystal size, and band gap energy has significant impact on the photocatalytic performance. Thus, the integration of two different metal oxides, for example TiO2–SiO2 composites will lead to an improvement in the photocatalytic activity over the individual components. In addition, the impact of TiO2–SiO2 composites could be enhanced if the metal oxides are adequately mixed with graphene or graphene oxide (GO). Thus, a novel nano material SiO2/TiO2-GO has been synthesised and characterized completely by analytical methods. The band gap energy of SiO2/TiO2-GO was determined by solid state reflectance spectra. Additionally, a theoretical study by DFT showed that TiO2 and SiO2 are able to interact with each other, followed by graphene oxide. The Density of States (DOS), band gap energy and molecular orbitals were determined for the composite. The relationship between the band gap energy and the resulted DOS for the studied system is being evaluated in order to consider it as a visible light harvesting material.

Liliana Margarita García-Rojas
Universidad Nacional Autonoma de Mexico
Title: Benzimidazole based ionic liquids coupled with ZnO nanoparticles for capture of CO2

Biography: Liliana Margarita García Rojas graduated in Materials Engineering from Universidad Juarez del Estado de Durango (UJED), Mexico. She did her M. Sc. in Materials Science and Engineering at Universidad Autónoma Nacional de México (UNAM). She is currently pursuing her Ph. D. in Environmental Engineering under the guidance of Dr. Pandiyan Thangarasu at Faculty of Chemistry, UNAM. She has vast experience in chemical synthesis of nanomaterials by different methods and its application in environmental sciences.

Abstract: Adsorption/desorption technique is widely considered for the capture of carbon dioxide (CO2), and it is a cutting-edge topic in energy and environmental remediation sectors. Some organic molecules such as ionic liquids have shown remarkable efficiency in adsorption of CO2 due to its high selectivity and stability; moreover, the preparation and use of ionic liquids are environmentally friendly since its long life and reusability given by its stability in harsh environments. In the present work, benzimidazolium diacid derivates (BDA) modified to form ionic liquid have been conjugated with ZnO nanoparticles as a potential sorbent for CO2 with high stability and surface area. For this purpose, a sol–gel method was employed for the synthesis of ZnO nanoparticles and benzimidazolium diacid was coated through in situ addition during the formation of ZnO which yield to production of catalyst Benz-Di-acid@ZnO. Prepared materials have been fully characterized by NMR, XRD, FT-IR and SEM analyses. In the preliminary study, it was observed that BDA-ZnO NPs exhibit remarkable antibacterial behavior and good efficiency in the capture of CO2. For evaluation of carbon dioxide capture, GC-MS and BET techniques are being used to evaluate the efficiency and results have been compared with CO2 capture in traditional metal oxide films (ZnO, ZrO2 and TiO2).

María del Carmen Travieso Novelles
National Center for Animal and Plant Health (CENSA), Apartado 10, San José de la Lajas; Mayabeque, Cuba
Title: Valorization of residual extract of hydro- distillation process for obtaining silver nanoparticles: Potentialities as antimicrobial agent against Xanthomonas axonopodis pv. phaseoli.

Biography: María del Carmen Travieso Novelles. Havana, Cuba. Graduated of Pharmaceutical Sciences Degree. 1994. University of Havana. Cuba. Master in Science and Technology of Biotechnological Processes. 2000. University of Havana. Cuba. PhD in Pharmaceutical Sciences. 2004. University of Havana. Cuba Professional experience She has an experience of more than 20 years in Scientific Research. September 1994- at present: Researcher at National Center for Animal and Plant Health (CENSA in Spanish). She has published more than 30 articles in Scientific Journals.

Abstract: The synthesis of metallic nanoparticles (MNP) using noble metals such as silver, has become a practice used to obtain promising nanostructures for different purposes (industrial, biomedical, agriculture, etc.), because they have optical, electrical, magnetic and thermal properties, that confer them behaviors and biological activities, in some cases, different to the individual systems that compose them. Numerous studies have shown their antimicrobial properties. The synthesis of silver nanoparticles (SNP) from plants constitutes a simple, fast and environmentally safe route. Numerous plant species have been reported with positive results for this purpose. In the present work, the residual aqueous extract of the hydrodistillation process of the essential oil from Thymus vulgaris L. was evaluated as a possible source of reducing and stabilizing agents to obtain SNP, as well as the start of the evaluation of the antimicrobial activity against Xanthomonas axonopodis pv. phaseoli. Preliminary results showed that the evaluated extract is promise for the green synthesis of SNP, also it showed antimicrobial activity similar to other silver ionic form and superior to the copper forms evaluated as positive control, which suggests the need for the continuation of the physical-chemical characterization studies and biological evaluations that will make possible the use of this abundant residual.

Héctor Valdés
Universidad Católica de la Santísima Concepción, Chile
Title: Photocatalytic oxidation of ethylene using natural zeolite doped with transition metal oxide nanoparticles

Biography: Héctor Valdés is full professor at Universidad Católica de la Santísima Concepción. He received his PhD in Chemical Engineering at Universidad de Concepción, Chile, in 2003. His main areas of research are related to the development of new technologies for the control of atmospheric pollution, non-conventional technologies for water and wastewater treatment and the development of new materials for biosensing applications, using activated carbons, zeolites and graphene nanosheets modified with metal and oxide metal nanoparticles and bismuth oxyhalides. He has authored 43 Publications, 2 patents; 1 book chapter; 60 conference presentations. He has more than 800 citations; with h-index 14.

Abstract: Ethylene is a plant growth regulator that induces accelerated softening and ripening of fruits during transport and storage [1]. Among the reported methods for ethylene control and removal, the combined effect of photocatalysis and adsorption has been suggested as a promising technique [2]. The work presented here is focused on the photocatalytic oxidation of ethylene using natural zeolite modified by the incorporation of transition metal oxides into the porous structure. Natural zeolite mainly composed of clinoptilolite and mordenite was modified in consecutive stages. Compensating cations were removed by ion-exchange using ammonium sulfate. Then, ammonium modified natural zeolite was doped with copper and zinc using copper and zinc nitrate solutions. Different metal modified zeolite samples were generated via ion-exchange and wet deposition methods. Samples were analyzed by scanning and transmission electronic microscopy (SEM, TEM), X-ray fluorescence (XRF), diffuse reflectance UV-visible spectroscopy (UV/VIS-DRS), diffuse reflactance infrared Fourier transformed spectroscopy (DRIFTS) and other analytical techniques. TEM assays depicted the incorporation of metal oxide particles around 9 nm and 10-40 nm over the surface of the zeolite samples modified by ion-exchange and wet impregnation methods, respectively. XRF analysis confirmed the presence of both metals at the desired levels. UV/VIS DRS assays showed that the applied modification procedures increase the optical absorption in the UV and visible regions, suggesting that an increase in the photocatalytic activity could take place. DRIFTS operando studies revealed that ethylene adsorption occurs mostly at bridged hydroxyl (Si-OH-Al) and external silanol (Si-OH) active sites. In modified zeolite samples, ZnO sites seem to absorb UV photons, forming electron-hole (e-h) pairs; whereas CuO nanoparticles could reduce the recombination of e-h pairs, increasing the absorption of photons with lower energy and enhancing the photocatalytic activity toward ethylene oxidation.

Hue-Min Wu
Chinese Culture University, No. 55, Hwa-Kung Rd, Taipei 111, Taiwan
Title: Luminescence Property of III-Nitride Composit Nanowires

Biography: Prof. Hue-Min Wu received her PhD in Material Science and Engineering from the University of Illinois at Urbana-Champaign, USA. She is currently a Professor in the Department of Optoelectric Physics of Chinese Culture University, Taipei, Taiwan. Her research interests are mainly focused on the synthesis of III-Nitride nanowires and their applications. She has authored and co-authored more than 50 publications in peer-reviewed journals and conference papers. She was a member of MRS, APS, and IEEE.

Abstract: The synthesis of one-dimensional semiconductor nanostructures has attracted much attention for novel potential applications in electronic, photonic, and biological areas. Innovative progress has been reported in the bottom-up assembly of these 1-D nanoscale devices as interconnects or functional components. The development of photoelectric devices has been focused on Ⅲ-nitride semiconductors which have very wide band gaps, that can emit blue light and lead to academic and industry development of light emitting diodes (LED), which result in nano process technology and applications of GaN have been developed over the past years In this research, we investigated the luminescence properties of one-dimensional III-nitride heterostructure. The catalytic assisted chemical vapor deposition (CVD) method was applied in the synthesis of high quality single crystalline GaN/AlN core-shell heterostructure nanowires, that the GaN-cored nanowires were sheathed with AlN shell of various thicknesses. The length of these coaxial nanowires is in the range of few microns, and the diameter 150-200 nm. These coaxial GaN/AlN nanowires exihibited band gap energies as determined by photoluminescence, corresponding to the spectra between blue light and ultraviolet radiation. Preliminary result of the optical characterization also suggested that the tunability of the GaN/AlN core/shell heterojunction radiation has a strong dependence on the ratio of shell-to-core thickness.

Chuen-Chang Lin
National Yunlin University of Science and Technology, 123 University Road Sec. 3, Douliu, Yunlin 64002, Taiwan.
Title: Carbon nanotubes/graphene composites treated by nitrogen-plasma and covered by porous cobalt oxide through galvanostatic electrodeposition as well as annealing for anode materials of lithium-ion batteries


Abstract: Carbon nanotubes/graphene composites are directly grown on nickel foil without additional catalysts by chemical vapor deposition (CVD). Next, to improve the anchoring and uniform dispersing of Co3O4 onto carbon nanotubes/graphene composites, the carbon nanotube/graphene composites are modified by radio frequency (RF) nitrogen-plasma. Then the porous Co(OH)2 thin films are galvanostatically electrodeposited onto N-doped carbon nanotubes/graphene composites at different cathode currents and time periods. Finally, porous Co(OH)2 is transform into porous Co3O4 by annealing. The specific capacity (1290 mAh g-1) reaches a maximum at the galvanostatic electrodeposition condition (current = 1.5 mA and time = 300 s). Furthermore, cobalt oxide/N-doped carbon nanotubes/graphene composites possess higher specific capacity and better electrochemical stability in comparison to cobalt oxide/carbon nanotubes/graphene composites.

Sychev Dmitrii
St. Petersburg University, Institute of Chemistry, Department of Colloid Chemistry
Title: Colloid-chemical approach for the obtaining of composite oxide nanostructured materials using the method of low-temperature sol-gel synthesis employing aluminum and silicon aeroxides with the additives of ZrO2 and CeO2.


Abstract: In the practice of producing high-strength constructional and optical materials, high-performance catalysts, and various functional coatings, composite oxide materials are of considerable interest. Using the low-temperature sol-gel synthesis method based on commercial alumina powders -Al2O3 (AEROXIDE Alu C “Degussa”, initial particle size, d0, 26 nm) and aerosil OX – 50 (Degussa, d0 = 40-50 nm), with the addition of nanosized ZrO2 hydrosols (d0 <25 nm), CeO2 (d0 <25 nm), a series of composite gels, xerogels and monoliths were synthesized. To select the optimal composition of bicomponent oxide systems and synthesis conditions (pH, temperature, concentration of the dispersed particles), as well as to study structure formation of the material at the gel formation stage, a colloid-chemical approach was used. It is based on a preliminary detailed study of the electrosurface characteristics and aggregative stability of one-component hydrosols in order to determine the contribution of one or another component of surface forces (ion-electrostatic, molecular, structural) to the overall balance of forces with changing pH and salt composition of the medium. For the formation of homogeneous bicomponent gels it is significant to consider the pair interaction energy of all mixture components between themselves and the concentrations ratio of differing particles in system to establish the dominant process and assumption of likely structure of the primary aggregate and the structure formed during gelling. During the study of the aggregative stability of ZrO2, CeO2, -Al2O nanohydrosols, it was found that for these systems the structural repulsion forces play a significant role in their stability. They determine the peculiarities of the particles coagulation (without direct contact between the particles), barrierless mechanism at a secondary potential minimum. It is shown that the character of pair particle interactions in composite system determined gel uniformity, the thickness of the interparticle liquid interlayers, the rheological properties of concentrated hydrosols, the pore size of the xerogel, and its strength. The second factor influencing the structure of the xerogels obtained in the sol-gel process was the ratio of mass (numerical) particle concentrations. For a series of composite xerogels, the drying and heat treatment modes of the gels were found to prevent their cracking, furthemore the optimal heating and sintering temperatures were determined.

Andrew Abramovich
St.Petersburg State University, Centre for Diagnostics of Functional Materials for Medicine, Pharmacology and Nanoelectronics, 198504 St. Petersburg, Russian Federation.
Title: The possibility of using macroscopic methods for observation the effect of grain boundaries on properties of metal-ceramics composites

Biography: Andrew Abramovich carry out the synthesis and researches of the new metal-ceramics composites possessed high strength and thermostability. Now his interest is in area of study of the grain boundaries in these composites. Exactly these boundaries determines the most important properties of composite as a whole. To study this properties he measures the composite elastic moduli and his thermo-physical parameters because the usual electronic microscopy methods (TEM, SEM) don’t allow to observe and study these boundaries.

Abstract: Сermets (metal-ceramic composites) are modern construction materials used in different branches of industry. Their toughness and heat resistance are determined by their elastic and thermo-physical properties. In addition, these properties are significantly dependent on the grain boundaries in the material. These boundaries are formed in the sintering process. In this work, cermets based on corundum and stainless steel (sintered in a high vacuum at temperatures of 1500–1600 °C) are investigated. The volume of steel in the samples varies between 2 and 20 vol.%. The elastic moduli were measured by the ultrasonic method at room temperature, measurement of the thermal conductivity coefficient was carried out at temperatures of 100 and 200 °C, by a method of continued heating in an adiabatic calorimeter. We found two extremes for the dependence of the elastic moduli (E and G) on the stainless steel concentrations, the nature of which is unknown. The moduli values changed in the ranges of E = 110–310 and G = 60–130 GPa (for different temperatures of sintering). Similar dependence is observed for the thermal conductivity coefficient with values varying by 10 to 40 relative units. A discussion of the results based on the structure cermet model as multiphase micro heterogeneous media with isotropic physical properties is also presented. The purpose of this work was searching of the formation of grain boundaries in metal-ceramics composites at various metal concentrations and sintering temperatures; influence these boundaries on elastic moduli and thermo conductivity to find the coupling of these properties, to estimate the optimal value of the metal concentration for achieve high quality of ready composites “corundum-stainless steel”.

Zhu Qiang
Institute of Materials Research and Engineering, A*STAR, Singapore
Title: Polymer Composites of PEDOT:PSS and Silver Nanostructures for Thermoelectric (TE) Applications

Biography: Zhu Qiang graduated with a PhD in Chemistry from the National University of Singapore in 2016, and has worked in Albany Molecular Research Inc. (USA MNC), Singapore as a Senior Research Scientist for 4 years. He is highly experienced in Small Molecule Synthesis and Chemical Processing. Currently he is working in the Institute of Materials Research and Engineering as a Scientist III with core research in nanoparticle & polymer synthesis, polymer composite fabrication, and conducting inorganic nanostructures for hybrid thermoelectric applications research. He also engages in projects that involves using nanoparticles to enhance the performance of industry based products such as functional coatings, thermal insulation and phase change materials. Zhu Qiang is a highly versatile individual with excellent skill sets in academia research and industry based works. His current research interests includes thermoelectric materials, conducting polymers and phase change materials.

Abstract: As a representing conducting polymer, PEDOT:PSS has been widely studied for various electronic applications, such as thermoelectric applications. Currently, DMSO has been used as an additive to PEDOT:PSS to improve the electrical conductivity up to 1000 S/cm. However, the Seebeck coefficient is usually <30 µV/K, which is not high enough for thermoelectric power output. The reason is attributed to the trade-off relationship between Seebeck coefficient and electrical conductivity. In order to solve this issue, some metallic nanostructures can be added to PEDOT:PSS to improve its Seebeck coefficient. The hetero-junctions between metallic nanostructures and PEDOT:PSS can be used for energy filtering, which could potentially enhance Seebeck coefficient. In this presentation, silver nanoparticles (Ag NPs) and silver nanowires (Ag NWs) were synthesized and added to PEDOT:PSS to investigate the effects on thermoelectric performance. However, when Ag nanostructures were employed, the aggregation of nanostructures was observed. In order to improve the dispersing property of Ag nanostructure in PEDOT:PSS, N-methyl pyrrolidone was added to improve the uniformity of polymer composites. As a result, it was found that Ag NPs and Ag NWs can significantly improve the electrical conductivity of PEDOT:PSS up to 3000 S/cm. Even though the Seebeck coefficient was decreased to 13 µV/K for Ag NPs, the overall power factor was improved to 50 µW*m-1*K-2. Meanwhile, the corresponding mechanism was also studied in this presentation.

Dedong Han
Institute of Microelectronics, Peking University, Beijing 100871, China
Title: Fully transparent oxide materials hafnium-doped zinc oxide and TFTs

Biography: HAN, Dedong is an associate professor in the Department of Microelectronics, School of EECS, Peking University. He obtained his Ph.D. from Peking University. His research interests include novel semiconductor materials and devices, novel thin film transistor, transparent and flexible displays. His research are summarized as follows: 1) Study on high K gate dielectric materials. 2) Study on Ge-based MOS devices. 3) Study on novel thin film transistor. 4) Study on transparent and flexible displays technology.

Abstract: With the development of active-matrix display system, the demand for high-performance thin film transistors is increasing in the industry. As conditional channel materials, Si-based TFTs have reached their limits. For recent years, oxide semiconductor thin film transistors have attracted much attention for the better performance than Si-based TFTs and potential use in the application of high resolution AMLCDs and AMOLEDs. Oxide TFTs have higher mobility and most oxide semiconductors are transparent in the visible light region and thereby they can be used to realize transparent displays. A large amount of researches have been carried out on oxide TFTs, especially ZnO-based TFTs. Among these materials, IGZO TFTs has been regarded as the most promising candidate to replace Si-based TFTs, and even had already been put into actual use by the industry. But in fact, Indium and Gallium are toxicants, rare elements on earth and going to be exhausted, hence people are searching for a non-In and non-Ga active channel layer which offers competitive advantages, such as lower cost, higher throughout, and safety. Apart from high mobility, ZnO-based TFTs have many advantages, for example, it is possible to growth at room temperature and ZnO is a wide band gap material (3.4eV) and it is transparent in the visible region. In our experiment, we choose Hafnium-doped ZnO as the channel material since Hafnium (Hf) is harmless to human and environment. We fabricated Hafnium-doped Zinc Oxide (HZO) TFTs using RF magnetron sputtering. Influence of sputtering pressure during the deposition of HZO thin films by RF magnetron sputtering on the performance of HZO TFTs is researched. And we found that the performance reaches the best when the sputtering pressure is 0.8 Pa, which exhibit the subthreshold swing of 0.25 V/decade, the saturation mobility of 268 cm2/V•s, the threshold voltage of 4.7 V and the on/off current ratio of 109. At higher sputtering pressure, the more collisions of sputtered molecules with Ar molecules resulted in low deposition rate, high resistivity and low mobility. Meanwhile, we also researched the device stability over time. And HZO TFTs fabricated on glass exhibited high stability.

Guihua Yang
Qilu University of Technology, Jinan, Shandong, PR China,
Title: Preparation of Cellulose Nanofibrils from Different Chemical and Mechanical Pulps

Biography: Dr. Guihua Yang is a full -time professor at the State Key Laboratory of Biobased Material and Green Papermaking, Qilu University of Technology. She is experts of State Council special allowance and Taishan Scholar. She has been working on the separation and purifcation of celluloses, hemicelluloses and lignin from wood, wheat straw and pulping spent liquors. She has also been working on the environmental friendly technology of high yield pulping and preparation of forest biomass functional materials.

Abstract: In recent years there has been a real breakthrough in the industrial production of cellulose nanofibril (CNF). Mechanical treatment has been the primary disintegration technique used to produce CMF and CNF. Refining, homogenization (using homogenizers and microfluidizers) and grinding are the most common techniques used for mechanical production of CNF. Wood-based fibers have been widely used to produce CNF. In this study, Bleached softwood kraft pulp (Radiata pine, Pacifico Pulp, Chile), Bleached hardwood kraft pulp (Acacia, April, Indonesia), CTMP (Poplar, International Paper, Russia), and unbleached kraft pulp (Pinus sylvestris, Ust-Ilimsk Pulp, Russia) were used as raw materials. The aim of this research is to utilize wood pulps of various chemical compositions (low and high-yield pulps) to produce CNFs and evaluate the production efficiency by the fibrillation degree and energy consumption. To accomplish these goals, CNFs were produced from pulps of various chemical compositions, the degree of CNF fibrillation was quantified by the data of the apparent viscosity, water retention value (WRV) and particle size distribution of CNF suspensions. Furthermore, changes in morphology during fibrillation process were observed by ultra high resolution SEM analysis. The results showed that the low lignin-containing unbleached kraft pulp (UKP) exhibited good performance for fibrillation, resulting in CNF with high viscosity, high water retention value, and small particle size. However, the fibrillation of high lignin-containing chemi-thermomechanical pulp was the most inefficient which resulted in heterogeneous materials with relatively low viscosity, low water retention value, and large particle size compared to chemical pulps. Furthermore, bleached softwood pulp from radiata pine was found to be much faster and for easier fibrillation compared to the bleached hardwood pulp from acacia due to the more rigid structure of hardwood fibers.

Ming He
Qilu University of Technology, Jinan, Shandong, PR China,
Title: Effects of cellulose nanofibrils with different addition methods on pulp drainability and paper properties

Biography: Dr. Ming He is a full -time lecturer at the State Key Laboratory of Biobased Material and Green Papermaking, Qilu University of Technology. He recieved his Ph.D. in 2017 in paper science & engineering from Kangwon National University (Chuncheon, South Korea) with a focus on nanocellulose-mineral composite preparation and application in fibrous materials. He joined the faculty at Qilu University of Technology in 2017 where he began to explore fundamental and applied aspects of renewable Bio-nanomaterials. His research interests include nanocellulose preparation and dispersion, bio-based superhydrophobic film preparation, biomass pretreatments, and wood pulping chemistry.

Abstract: In the past decade, there has been an intense research activity in the field of cellulose nanofibril (CNF) and cellulose microfibril (CMF). Generally, CNF or CMF can be produced by mechanical disintegration (refining, homogenization, microfluidisation, grinding and high intensity ulstrasonication). The decreased size of fibers from micro-scale to nano-scale in width by mechanical shearing offers a new potential with characteristic properties such as high mechanical strength, large specific surface area, high aspect ratios, barrier properties, biodegradability and biocompatibility. In the papermaking industry synthetic polyelectrolytes have been used for several purposes such as to increase retention of fines and fillers (kaolin, PCC etc.), and hence to improve paper quality and reduce material and energy costs. CNFs have a large specific surface area and high aspect ratio and they can form a network already in very dilute aqueous suspensions. Therefore, it is likely that CNFs can effectively bind and hence flocculate small particles such as fines and fillers. In this work, hardwood bleached kraft pulp were used as raw materials for the preparation of CNFs. The fibrillation was performed by using Disk mill (MKCA6-2, Masuko Sangyo, Japan) with a gap clearance of -150 um until 35 passes. The quantitative characterization of the degree of CNF fibrillation based on the data of the degree of polymerization (DP), water retention value (WRV) and viscosity of CNF suspensions were measured. Cellulose nanofibrils were used in two different ways in handsheet forming processes: a PCC–CNF composite filler and a papermaking additive in handsheet forming. Filler retention, strength properties, formation and optical properties of the handsheets were evaluated in accordance with the ISO standard methods.

University “Dunarea de Jos,” Galati, Romania
Title: Antioxidant nanoparticles for cancer treatment: obtaining and biological evaluation

Biography: The didactic activity, I have initially practiced at the "Grigore T. Popa" University of Medicine and Pharmacy, Faculty of Pharmacy, Iasi, Romania, during the period 2009-2015 and in the present I am Associate Professor at the Faculty of Medicine and Pharmacy, "Dunărea de Jos" University of Galati. In order to increase the scientific reputation, the research activity is focused on projects that fall within the field of Pharmacy and Material sciences, based on the synthesis of new biologically active compounds and the use of polymers with the purpose of obtaining innovative therapeutic formulations.

Abstract: With an increasing incidence among young people, cancer is a disease that affects millions of people worldwide. While stimulation of angiogenesis in cancer, favors metastasis, the anti-angiogenic therapy proved to be an important approach against tumor growth. In this respect, it is a well-known fact that the consumption of antioxidants can be recommended to achieve the inhibition of angiogenesis [1]. The use of antioxidants in the form of nanoparticles could improve the efficiency of the above-mentioned therapy due to specific surface area of nanostructures. The degree of novelty of this work is highlighting the therapeutic antioxidant potential of new chitosan derivatives nanoparticles, to be used in cancer therapy. By an original and interdisciplinary approach, the present work aims through the following directions: (i) synthesis and physicochemical characterization of new chitosan-derivatives (CS1-6) [2]; (ii) development and characterization of some nanoparticles based on new chitosan-derivatives, by ionic reticulation, using as cross-linking agent sodium tri-polyphosphate (STPP) [3]; (iii) antioxidant potential evaluation of therapeutic polymer matrices using various spectrophotometric methods: total antioxidant capacity, ferric reducing power and radical scavenging ability [4]. The new chitosan derivatives have been characterized in terms of spectral analysis aiming highlighting both the rest of glucosamine, characteristic to chitosan, and sulfonamide moieties. The size of the obtained nanoparticles, using chitosan low molecular weight derivatives, is between 256.6 and 622.2 nm. The antioxidant properties of low molecular weight chitosan derivatives are more intense than chitosan, which supports the positive influence of structural modulations and nano-encapsulation process. Thus, in the future, we have proposed to test the involvement of antioxidant nanoparticles in the pathological angiogenesis.


Session Introduction

Akbar Alibeigloo
Tarbiat Modares University, Iran
Title: Coupled thermoelasticity solution of carbon nano tube reinforced composite cylindrical panel under thermal shock

Biography: I am Akbar Alibeigloo full Prof. in Mechanical Engineerig and my BS, MSc, and PhD degree is from Tehran Polytechnic.

Abstract: Based on Lord-Shulman theory, thermoelastic analysis of a simply supported carbon nanotube reinforced composite (CNTRC) cylindrical panel with different pattern of CNT distribution and subjected to thermal shock is carried out using generalized coupled thermoelasticity. State space technique along the radial direction and Fourier series expansion along the in-plane coordinate is employed to solve the problem analytically in Laplace domain. Then using inverse Laplace transform results in the solution in time domain . Finally numerical illustration is conducted to evaluate effects of different patterns of CNT distribution, CNT volume fraction, pick of thermal shock and mid radius to thickness ratio on transient thermoelastic behavior of FG-CNTRC cylindrical panel.

Materials Processing and Product Manufacturing

Session Introduction

Yi Huang
Bournemouth University, Poole, Dorset BH12 5BB, UK.
Title: The manufacturing of graphene-reinforced nanocomposites using severe plastic deformation technique

Biography: Dr Yi Huang is a lecturer in Department of Design and Engineering, Faculty of Science and Technology, University of Bournemouth, UK. She received her PhD in Metallurgy and Materials from the University of Birmingham. She worked as a research fellow and senior research fellow at the University of Southern California, University of Cambridge, University of Strathclyde and University of Southampton. She is interested in advanced manufacturing, advanced materials, nanomaterials, nanocomposites and the relationship between the microstructure and mechanical properties of materials.

Abstract: The conventional metal matrix composites are either manufactured by liquid method (e.g. casting) or powder metallurgy method (e.g. sintering). The liquid processing methods usually produces agglomerated particles in the ductile metal matrix due to the large density difference between graphene and the metal matrix which leads to an unwanted brittle nature. The powder metallurgy method would cause oxidation of the metal matrix and produce unclean interfaces between the particulates and the matrix leading to a weak bonding and consequent low mechanical strength. In addition, both liquid and powder methods will not generate a matrix with ultrafine-grained structure due to casting structure from liquid method and unexpected grain growth in the matrix during high temperature sintering. High-pressure torsion (HPT), as a new severe plastic deformation technique, can introduce severe shear strain to refine the grain structure in metallic materials and make the reinforcements redistribute within the metal matrix through the flow of turbulent eddy currents. The most important thing is HPT can easily process materials at room temperature without introducing cracks, and can avoid all disadvantages from high temperature processing. Through HPT processing we can attain the real meaning of graphene-reinforced nanocomposites with graphene acting as nano-additives and the metal matrix having nanocrystalline grain structure. We have successfully developed a room temperature route combined with HPT to manufacture graphene-reinforced aluminium-based nanocomposites with improved dispersion of graphene in aluminium matrix and ultrafine-grained structure in aluminium matrix. The synthesized graphene-Al nanocomposites have improved mechanical strength compared to commercial purity Al.

Materials-Environment Interactions

Session Introduction

Ridha Horchani
Sultan Qaboos University, Muscat, Sultanate of Oman
Title: Ultrafast laser excitation of CO/Pd (111) Probed by Sum Frequency Generation (SFG): Pump laser energy effect on the induced CO photo-desorption


Abstract: The desorption of CO from Pd (111) induced by femtosecond laser pulses is probed by IR + vis sum frequency generation (SFG). A large redshift of the main band, a broadening, and a strong decrease in intensity are observed; these originate from coupling of C-O stretch to low frequency modes (the frustrated rotation). Simulation based on two temperature model of electron and phonon heat baths within the substrate, show that CO desorption from the Pd(111) is an electron-mediated process, this corresponds well with the results obtained by two pulse correlation [1]. SFG spectra show a development of a second band at high frequency at negative delay, which disappears at positive delay, due to an interference phenomenon between disturbed and undisturbed states of the SFG pulse. The CO desorption is becoming important with increasing the pump energy. We compared CO photo-desorption from Pd(111) to others metals, indeed the most probable hypothesis that makes the difference between metals is the position of CO 2p* adsorbate resonance [2], into which substrate electrons may be excited. Other factors may play a role as the distance and the strength of CO-Metal.

Helen Hein
University of Stuttgart.
Title: LCA of currently being developed products – classification and evaluation of an innovative aerogel-based insulating plaster from the ecological point of view

Biography: Helen Hein holds a master degree in civil engineering. Since 2016, she works as a research assistant in the field of life cycle assessments at the Institute for Construction Materials, University of Stuttgart, Germany. She is involved in R&D projects focusing on innovative construction materials. They are responsible for the LCA activities in the Horizon 2020 projects HomeSkin as well as Wall ACE, where the research mainly focuses on aerogel-based materials for insulation purposes.

Abstract: As a pillar of sustainable development, ecology has become an important milestone in research community, especially due to global challenges like climate change. The ecological performance of products can be scientifically conducted with life cycle assessments (LCAs). In the construction sector, significant amounts of CO2 emissions are assigned to the energy used for building heating purposes. Therefore, sustainable construction materials for insulating purposes are substantial, whereby aerogels have been explored intensively in the last years due to their low thermal conductivity. Therefore, the WALL-ACE project aims to develop an aerogel-based thermal insulating plaster that would achieve minor thermal conductivities [1]. But as in the early stage of development phases a lot of information is still missing or not yet accessible, the ecological performance of innovative products bases increasingly on uncertain data that can lead to significant deviations in the results, which is also described in [2]. To be able to predict realistically how meaningful the results are and how viable the developed products may be with regard to their corresponding respective market, these deviations however have to be considered. Therefore, a classification method is presented in this study which may allow comparing the ecological performance of modern products with already established and competitive materials. In order to achieve this, an alternative calculation method was used that allows computing with lower and upper bounds to consider all possible values without precise data. The life cycle analysis of the considered products was conducted with an interval arithmetic based calculation method. The results lead to the conclusion, that the interval solutions describing the possible environmental impacts are so wide that the result validity is limited. Nevertheless, a further optimization in reducing environmental impacts of aerogels seems that it needs to become more competitive in the future.

Carbon nanomaterials, devices and technologies

Session Introduction

Naiyer Razmara
Azarbaijan Shahid Madani University, Tabriz, Iran
Title: Promising Applications of Carbon-based Nanostructures for Natural Gas Separation


Abstract: Capability in separating distinctive components of natural gas is one of the main topics on the natural gas usage and application. In this regard, the improvement activities to optimize the physical separation of components from natural gas are highly preferred. One of the approaches is to employ carbon-based nanomaterials a for gas separation. Carbon-based nanomaterials have been attracting plenty of attention for separation technologies during the last decades for the sake of their promising applications. Conducting a comprehensive review on the literature, we will focus on the current developments of carbon-based nanomaterials, nanofibers and membranes regarding their separation performance to better understand the phenomena as natural gas separation. A general overview will be shown on the research advances alongside with some challenges and obstacles to the development of carbon-based nanomaterials for natural gas separation.

Materials Science and Engineering

Session Introduction

Guiling Ning
Dalian University of Technology, China
Title: Construction of boron-containing nanostructures and their attractive performances for practical applications

Biography: Guiling Ning, Professor, Ph.D. B. S. (1982), M. S. (1985), Ph.D. (1996) Dalian University of Technology; Guest researcher (1993): Institute of Thermophysics, New Siberia of Russia; Postdoctoral fellow (1997-1999), Kinki University, Japan; Visiting scholar (2003-2004): Texas A & M University, USA. Former vice president of the Dalian University of Technology, Director of boron Chemicals and New Materials Research Center of Liaoning Province, Vice president of inorganic salt committee of Chinese Chemical Society. Her research interests include inorganic nanostructure new materials, crystalline functional materials, and photoelectric functional materials. She published more than 150 papers and licensed more than 30 patents.

Abstract: Boron-containing compounds, such as H3BO3, B4C, BN, ZrB2, Co/Ni-B as well as boron-based MOFs, have been attracted more and more attention because of their capabilities in preventing harmful radiation, catalysis of fuel reaction for battery, and obvious antibacterial properties. Some special nanostructures of these compounds can greatly increase their performances or change functions. Up to now, however, the directed nanostructure construction or nanostructure control is still a great challenge. For instance, boric acid H3BO3 aqueous solution is widely used in nuclear power plant for preventing harmful radiation. However, traditional crystallized H3BO3 exhibits a very slow dissolution rate in water, which remarkably influences the running efficiency of nuclear plant. The preparation of high-purity instant boric acid for practical use is challenging. The silimar case also happed in boron-based MOFs for antibacterial materials and in Co/Ni-B nanostructures for selective catalysis reactions for fuel battery. In this presentation, we aimed at aplication-performance perposed nanostructure construction or mophology-control of boron-containing compounds. We exhibit some novel construction or assembly approachs to obtain some desired nanostructurs. In special, a sphere-like heterogeneous nanostructure shows much higher dissolution rate than that of industril product. The relationship between these nanostructures and their high aplication performances was also revealed.

Sandor Kokenyesi
2Institute of Physics, University of Debrecen, Bem sq.18/a, Debrecen, 4026, Hungary
Title: Acrylate polymer-inorganic nanocomposites for photonic applications

Biography: The presentation will be made by Dr. Sandor Kokenyesi on behalf of co-authors, as a result of research made in International cooperation between Universities. Presenter is working at the University of Debrecen as Emeritus prof, teaching courses on materials science, nanotechnology, photonics and leading scientific team. The main fields of his scientific interests are light sensitive materials, first of all amorphous chalcogenide semiconductors and optical recording processes in these materials. He is a co-author of more as 150 scientific papers, a number of patents are published, presentations at many International conferences were made.

Abstract: Polymer nanocomposites with oxide and gold nanoparticles are known as suitable for efficient direct one-step optical relief recording [1]. We have further developed this type of light-sensitive materials by introducing inorganic nanoparticles like high-refractive index chalcogenide glass (ChGNP) as well as gold nanoparticles (GNP) and rear-earth oxides to the monomer/polymer matrix for upgrading the functionality of photopolymer. This way the average refractive index, efficient redistribution of nanoparticles during optical processing as well as luminescence of the processed nanocomposites, diffraction efficiency of gratings and modulation of surface/volume structures were increased. At the same time the smooth adjusting of optical parameters after recording was realized due to the plasmon-resonance effects in GNP or due to reversible light-stimulated changes of optical parameters in ChGNPs. This way the amplitude-phase modulation characteristics of in-situ optically recorded photonic elements made from such nanocomposite layers on a given hard of flexible substrates were improved.


Session Introduction