3rd World Congress and Expo on

Nanotechnology

November 07-09, 2016, Singapore

Scientific Programme(Day 1 : Nov-07-2016)

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Keynote Speaker

Manoj Gupta
National University of Singapore (NUS),
Singapore

Title: Magnesium (Composite) Technology for Sustainable Planet Earth

Biography: Prof Manoj Gupta is currently associated with Materials Division of the Mechanical Engineering Department of National University of Singapore. He did his Ph.D. (Materials Science) from University of California, Irvine, USA (1992), and postdoctoral research at University of Alberta, Canada in the same year. His current research interests include processing, microstructure and properties evaluation of advanced light weight structural materials. To his credit are: (i) ‘Disintegrated Melt Deposition’ technique, a unique liquid‐state processing method, and (ii) ‘Hybrid Microwave Sintering’ technique, an energy efficient solid‐state processing method, to synthesize Al and Mg light‐metal alloys/micro/nano/metastable‐composites. He has published over 410 peer reviewed research papers in various international journals and owns two US patents related to development of processing techniques and advanced materials. His current h‐index is 56, RG index is 45.8 and citations are more than 12000. He has also coauthored four books. He is Editor‐in‐chief of three journals and hold important editorial positions in 12 other journals. Prof Gupta also received in Dec. 2015 Distinguished Scientist in Engineering Materials award from Venus International Foundation based in Chennai, India. Currently he is also a Visiting Professor of King Saud University and Part‐time Lecturer of Kobe University, Japan.

Abstract: In last 100 years advancement in technology had an adverse effect on planet earth and the living organisms on it. This can largely be attributed to scientific and technical ignorance of humans. These days irregular weather patterns and its consequent effect on livelihood can be seen and efforts are finally being placed to mitigate the undesired effects of advancing technology. One way to mitigate the adverse environment effects is to reduce greenhouse gas emissions that can control the global warming. Among many other sectors, transportation sector contributes significantly to carbon di oxide emissions. One of the ways to control this emissions is to replace existing materials with lightweight materials and the prime candidate among the metallic materials is magnesium. Magnesium is a health supplement to both plants and animals and is available in abundance. Currently, only limited magnesium based materials are available for engineering applications and it is crucial that new materials and those with high performance are developed. One of the ways to improve the properties of magnesium based materials is to use reinforcement at nano-length scale. The use of nano-reinforcement has the potential to minimize weight penalty, improve tensile and compressive response, enhance dynamic properties, enhance ignition response and minimize dry and wet corrosion susceptibility. An overview of the capability of nano-reinforcements on holistic development of magnesium and its alloys will be presented.


Nanomaterials

Session Introduction

Rasoul Salehi
Isfahan University of Medical Sciences,
Iran

Title: Oral delivery of Eudragit Coated Nanoparticles of Chitosan- pGIP/Ins gene construct is successfully regulate hyperglycemic state in induce type 2 diabetic rat

Biography: Professor Rasoul Salehi has completed his PhD from Banaras Hindu University, Varanasi India in 1991. Later he joined Center for Medical Genetics at Virige Univrsity AZ-VUB, Bruxelles, Belgium, for postdoctoral studies. He is Head of the Department of Genetics and Molecular Biology, School of Medicine, Isfahan University of Medical Sciences, Isfahan, Iran. He has published many scientific papers in reputed journals and delivered speech in many international scientific gatherings.

Abstract: Type 2 diabetes (T2D) currently is one of the leading causes of worldwide morbidity and mortality. Life style changes with addition of metformin, sulphonylureas, glinides, α-glucosidase inhibitors, thiazolidinediones and/or exogenous insulin are recommended as the present treatment options. These treatments offer improvement in glycemic control, but in many instances produce significant adverse side effects. Gene therapies to produce insulin in diabetic patients have been considered for several years. Genetic engineering of ectopic insulin production and secretion in autologous non-beta-cells has been tested in different tissues. Recently, gut K-cells have been shown to express glucokinase, the glucose sensor of pancreatic beta-cells. K-cells are responsible for the secretion of the glucose-dependent insulinotropic peptide (GIP). In present study preparation of gene nanoparticles (NPs) of chitosan within a layer of Eudragit L100 for oral delivery of a gene construct harboring insulin gene under control of GIP promoter to the gut K-cells of induced diabetic rats was evaluated. Chitosan particles were prepared by coacervation technique followed by encapsulation of nanoparticle within a coat of Eudragit L100 using solvent evaporation technique. Various assays like stability of particle construction and release profile of DNA, size and zeta potential and in vivo therapeutic effects have been done. In induced T2D rats, blood glucose, human insulin content of rat serum, viability and expression of human insulin by upper part of gut in T2D rats were evaluated. Our data are indicative of successful conversion of hyperglycemia to a normal glucose state 48 hours after oral delivering of insulin gene construct in diabetic rats


SURIATI BINTI PAIMAN
Universiti Putra Malaysia,
Malaysia

Title: Growth and characterisation of indium phosphide nanowires for optoelectronic applications

Biography: Dr. Paiman S. received her Bachelor of Industrial Physics and Master of Science (Physics) from the Universiti Teknologi Malaysia (UTM), Malaysia, in 1999 and 2002, respectively. She did her Ph.D. degrees in Physics at the Australian National University (ANU) Canberra, Australia, in 2012 in the area of III-V Semiconductor Compounds Nanowires. In 2003, she joined the Department of Physics, Universiti Putra Malaysia, as a Lecturer, and in 2012 became a Senior Lecturer. Her current research interests include growth and characterization of semiconductor nanowires and III-V semiconductor nanowires towards nanodevices.

Abstract: We review InP nanowires growth on (111)B substrates by metal organic chemical vapor deposition via vapor-liquid-solid (VLS) mechanism. The characterisation techniques, namely field-emission scanning electron microscopy, high-resolution transmission electron microscopy, atomic force microscopy, time-resolved photoluminescence and micro-photoluminescence spectroscopy have been used to understand the influence of various parameters such as growth temperature, V/III ratio, Au catalyst size, growth rate and pre-growth annealing temperature on the NW crystal structure and optical properties. This study shows that these parameters can influence the morphology-crystal structure-optical relationships in InP nanowires. Therefore by controlling growth parameters, InP nanowire morphology can be optimised, thus producing nanowires with minimal tapering and uniform diameters, while their crystal structures can be tuned to obtain desired properties. This will allow InP nanowires of known crystal structures to be designed and grown for future nanowire-device applications.


Apostolos Atsalakis
University of Cambridge,
UK

Title: First-principles study of siloxene and germoxene: stable conformations, electronic properties, and defects.

Biography: Apostolos Atsalakis is the co-founder and CEO of ENDO Medical, a company in the area of bio / med – tech. He is a PhD candidate at the University of Cambridge and has published several peer-reviewed articles and five patents with commercial applications. He holds an MPhil degree in Nanotechnology from the University of Cambridge and a Bachelor / MSc in Applied Physics from the National Technical University of Athens.

Abstract: Recent interest in two-dimensional (2D) forms of Si and Ge has surged recently, with a focus on silicene and germanene, the Si- and Ge-based analogues of graphene, as well as their derivatives. Siloxene and germoxene are 2D materials made of honeycomb Si and Ge backbone sheets that are decorated with H atoms and OH groups. This work uses first-principles calculations to probe the properties of their various conformations. It is shown that the most stable siloxene (and germoxene) polymorph is the so-called washboard structure, and not the chair geometry assumed in previous studies. The stability of the washboard configuration relates to the formation of a network of hydrogen bonds between its hydroxyl groups. It is also found with hybrid functional calculations that siloxene and germoxene are wide band-gap semiconductors with gap values of 3.20 eV and 2.64 eV, respectively. Finally, we show that H and OH vacancies introduce spin polarization in these 2D materials and have a tendency to pair up in stable di-vacancies.


David Riassetto
Grenoble-INP,
France

Title: Surface Functionalization by Sol-Gel Chemistry

Biography: Dr. David Riassetto is an Associate professor of Material Science. He got a Master of Science degree in physics and energy with honors in 2005 at University Joseph Fourier of Grenoble and a Ph.D. at Grenoble Institute of Technology in 2009. Between 2009 and 2011 he was a postdoctoral researcher at the University of Utah. Since 2011, he is an associate professor at Grenoble Institute of Technology and doing his researches in the LMGP laboratory (Laboratory of Materials and Physical Engineering) has a member of the Thin Films, Nanomaterials and Nanostructures team, and more precisely of the Wet Chemistry & Surface Functionalization group. Currently Dr. David Riassetto’s researches focus on the surface functionalization at the nanometer scale, using wet-chemistry methods (e.g. sol-gel, photochemistry, …).

Abstract: Photolithography is a well-known and often used technique. However, this technique is mainly used for bulk material or native oxide etching and usually requires an etching step with a strong acid or base. Due to these reasons, photolithography is not well compatible with sensitive substrates like glass or plastic ones. Based on sol–gel route, we formulated and optimized different all-inorganic oxides photo-resists. These photo-resists lead to a single-step lithography (i.e. with only one deposition step) of nanometer-scale thin oxides films, etched with solvent or diluted acid. Such method is compatible with the formation of gratings in the range of the millimeter to the sub-micrometric size on rather large surfaces o top of glass or plastic substrates. Our photo-resist are made by integrating a photosensitive chelating compound to a “classical” sol-gel oxide sol. These photoresists may be deposited by spincoating on various substrate, then insolated through a mask and partly wached/etched. On one hand, TiO2 photo-resist was investigated for the synthesis of surface with a spatial wettability contrast. On the other hand, ZnO photo-resist was studied for the localized growth of ZnO nanowires. The synthesis principle will be introduced. The physicochemical and morphological properties of the obtained surfaces, linked to the process parameters, will be presented. Moreover, potential applications will be shown.


Manoj Aravind Sankar
Vel Tech Dr.RR & Dr.SR Technical University,
India

Title: Nanotechnology - Nanomaterials

Biography: I am Manoj Aravind Sankar from India. I am currently pursuing the third year of the four-year Bachelor of Technology programme specialized in Electronics and Communication Engineering. I have presented a conference paper on Solar Cells. I am a co-inventor of two pending Indian patents related to Antennas and Solar Cells. I am currently working with my teammates on innovative antenna designs, biomimicry based electronics systems, alternate coatings for solar cells. My prime research interests are Nanoelectronics, BioMEMS, Semiconductors and Solar Cells. My aim is to become a research scientist and work on collaborative projects towards Science and Technology, as well as for the benefit of the world.

Abstract: Nanotechnology refers to the technology involving manipulation, fabrication, synthesis, etc, at the atomic and molecular levels, that is about dimensions in the range of 1-100 nanometres. Since its inception in 1959, the field has progressed exponentially all over the years and finds application in almost all domains, be it Industry, Military,Medicine, etc. The nanotechnology counterparts of various materials have been synthesized, many of whose properties have bewildered the scientists. Examples of nanomaterials inlude Graphene, Boron Nitride, Silicon Carbide, Fullerenes,etc. Nanomaterials have been synthesized all over the years by various approaches - top-down, bottom-up, biological, etc. The materials in which I am interested to pursue research are Graphene, Chlorophyll and Iron Pyrite. Graphene is the first two dimensional material to have been synthesized and is a potential semiconductor. Chlorophyll can be harnessed as a biocoating for devices utilizing the visible spectrum of Light. Iron Pyrite is an ancient significant molecule with excellent semiconductor properties and is still being studied as a potential material in optoelectronics.


Carbon nanomaterials, devices and technologies

Session Introduction

Long-Li Lai
National Chi Nan University,
Taiwan

Title: Design and Synthesis of Triazine-based Dendrimers for Mesogenic and Gas Adsorbing Studies

Biography: Long-Li Lai received his Ph. D. degree in Se chemistry in 1992 from the Department of Chemistry, the University of Witwatersrand under professor D. H. Reid. After several research stints as postdoctoral scholars, he currently is a professor in Department of Applied Chemistry, National Chi Nan University Taiwan. His research interests include the synthesis and physical study of LC dichroic azo-dyes and triazine-based dendrimers. In dendritic areas, he is particularly interested in preparing dendrimers containing various pore sizes in the dendritic framework for their potential in catalytic reaction. He has published over 70 scientific papers including patents and articles.

Abstract: Dendrimers, consisting of central cores, linking groups and peripheral units often possess the natural tree-like and branched 3D frameworks and have attracted a great of attention.[1] Particularly, combination of these functional moieties lead dendrimers to exhibit versatile dendritic frameworks. Therefore, dendrimers are designed and prepared for various purposes.[1,2] Dendrimers have been observed to exhibit columnar liquid crystalline (LC) phases and found useful in photovoltaics and field transistors [2] due to their non-grained boundary and uniform alignment.[2a,3] However, various combinations of cores, linkage units, and peripheral functionalities of dendrimers lead their molecular conformations to be versatile, and therefore, it is not easy to control their molecular shapes as those of traditional rod-like or disc-shaped LC molecules. On the other hand, global warming has become a key concern and CO2 gas is regarded as one of the important causes. So, reducing CO2 emission, such as the capturing of CO2 from the industrial factory, is currently a challenge and the development of effective technologies for adsorbing CO2 will be necessary in the future.[4] We thus aim to prepare triazine-based dendrimers with special peripheral functionalites, such as flexible alkyl chains or bulky moieties, to study their mesogenic behaviors on thermal treatment or their gas adsorbing ability at the solid state, respectively.


Materials Science-Fundamentals & Characterization

Session Introduction

Yoav D. LIVNEY
Israel Institute of Technology
Israel

Title: Harnessing proteins to control crystal size and morphology, for improved delivery performance of hydrophobic bioactives, using genistein as a model

Biography: Prof. Yoav D. Livney [B.Sc. (Suma cum Laude, 1990) Food Engineering & Biotechnology, Technion Israel Institute of Technology; M.S. (1995) Food Engineering, UW Madison, Wisconsin, USA; PhD (2002) Food Engineering & Biotechnology Technion IIT; Post-Doc Food Science, University of Guelph, Canada] of the Biotechnology and Food Engineering department, Technion [2004- Lecturer; 2007- Asst. Professor, 2012- Assoc. Prof.] is an expert in physical chemistry of biopolymers, and nano-delivery systems for nutraceuticals and drugs. Authored >50 publications, 8 patents, gave >35 invited talks at international conferences, and mentored 13 M.Sc. and 7 Ph.D. students. Editorial-Board Member in several reputed journals.

Abstract: Protein-surface and protein-crystal interactions are important in many areas of technology including drug and nutraceutical delivery, as many bioactives are highly hydrophobic and tend to crystallize, resulting in poor bioavailability. The improved ability to control lipophilic bioactive nanocrystal formation and dispersibility can increase colloidal stability, and open new ways to control the release of incorporated bioactives and their bioavailability. Herein we compared three model proteins: β-Casein, hydrophobin, and β-lactoglobulin, representing different structural groups of proteins, and assessed their functionality in preventing crystal growth, using genistein (Gen) as a model hydrophobic crystallizing bioactive. Dynamic light scattering, polarized light microscopy and cryo-TEM showed that β-lactoglobulin, hydrophobin and β-casein, respectively inhibit genistein crystal growth in aqueous solution in increasing order of efficacy. Protein structure determines the mechanism and the efficacy by which it affects crystal growth and morphology: β-lactoglobulin, a rigid globular protein with an inward facing hydrophobic domain, indirectly suppresses crystallization by binding and reducing concentration of free hydrophobic compound molecules. Hydrophobin (Hyd), a rigid globular protein with a flat external hydrophobic domain, adheres to the surface of certain crystal faces limiting growth in the perpendicular directions. β-Casein, (β -CN) a rheomorphic protein with an external hydrophobic domain, adheres to different crystal faces non-specifically, thereby blocking growth in all directions. Consequently, an inverse correlation was observed between nanocrystal size and in vitro bioavailability. Based on this study, amphiphilic proteins can be more effectively selected and applied to control crystal growth and morphology of hydrophobic bioactives to improve their delivery and bioavailability in food and drug systems.


Yung-Kang
University of Oxford
U.K

Title: Trimethylphosphine-assisted Surface Fingerprinting of Metal Oxide Nanoparticle by 31P Solid-state NMR: A Zinc Oxide Case Study

Biography: I am a third year Ph.D. student in oxford chemistry department. Before I joined Professor Tsang’s group, I recieved my BSc and MSc degrees in chemistry from National Chung Cheng University and National Taiwan University. Currently, my research focuses on using NMR techniques to probe active sites on catalyst surface and at the same time exploring reaction mechanism. During my spare time I enjoy playing piano and swimming.

Abstract: Nano metal oxides are becoming widely used in industrial, commercial and personal products (semiconductors, optics, solar cells, catalysts, paints, cosmetics, sun-cream lotions, etc).[1-3] However, the relationship of surface features (exposed planes, defects and chemical functionalities) with physiochemical properties is not well studied primarily due to lack of a simple technique for their characterization. In my study, solid state 31P MAS NMR is used to map surfaces on ZnO plate, rod and powder samples with the assistance of trimethylphosphine (TMP) as a chemical probe.[4] As similar to XRD giving structural information of a crystal, it is demonstrated that this new surface-fingerprint technique not only provides qualitative (chemical shift) but also quantitative (peak intensity) information on the concentration and distribution of cations and anions, oxygen vacancies and hydroxyl groups on both nonpolar and polar surfaces (Figure 1) from a single deconvoluted 31P NMR spectrum. On the basis of this technique a new mechanism for photocatalytic •OH radical generation from direct surface-OH oxidation is revealed, which has important implications regarding the safety of using nano oxides in personal care products. This technique is also applicable to other nano-metal oxides and should enable systematic investigation of facet-dependent physiochemical properties in the future.


Evgeny Krasikov
National Research Centre "Kurchatov Institute”,
Russia

Title: Nanostructure Evolution as Cause and Effect of Self-Recovering Section of the RPV Steel Radiation Embrittlement Kinetics

Biography: Date of birth: September 11, 1946 Education: Moscow Power Engineering Institute Date: September 1964 - February 1970. Degree(s) or Diploma(s) obtained: Master’s Degree in Material Science – 1970, Ph.D. – 1974, D.Sc. -2005. Membership of professional bodies: member of Scientific Council of RAS on Radiation Damage Physics of Solids. Years within the firm: since 1974. Key qualification: responsible executor in Radiation Damage Physics of Solids. Professional experience record: Date: since 1974 till now. Moscow, National Research Centre "Kurchatov Institute”, Department: Reactor Materials and Technologies Institute.

Abstract: Influence of neutron irradiation on reactor pressure vessel (RPV) steel structure degradation are examined with reference to the possible reasons of the substantial experimental data scatter and furthermore – nonstandard (non-monotonous) and oscillatory embrittlement behavior. In our glance this phenomenon may be explained by presence of the wavelike recovering component in the embrittlement kinetics. We suppose that the main factor affecting steel anomalous embrittlement is fast neutron intensity (dose rate or flux), flux effect manifestation depends on state-of-the-art fluence level. At low fluencies radiation degradation has to exceed normative value, then approaches to normative meaning and finally became sub normative. Data on radiation damage change including through the ex-service RPVs taking into account chemical factor, fast neutron fluence and neutron flux were obtained and analyzed. In our opinion controversy in the estimation on neutron flux on radiation degradation impact may be explained by presence of the wavelike component in the embrittlement kinetics. Therefore flux effect manifestation depends on fluence level. At low fluencies radiation degradation has to exceed normative value, then approaches to normative meaning and finally became sub normative. As a result of dose rate effect manifestation peripheral RPV’s zones in some range of fluencies have to be damaged to a large extent than situated closely to core. Moreover as a hypothesis we suppose that at some stages of irradiation damaged nanostructure of the metal have to be partially restored by irradiation i.e. neutron bombardment. Nascent during irradiation nanostructure undergo occurring once or periodically evolution in a direction both degradation and recovery of the initial properties. According to our hypothesis at some stage(s) of metal nanostructure degradation neutron bombardment became recovering factor. As a result oscillation arise that in tern lead to enhanced data scatter. In this case we have to consider irradiation as a recovery factor. For the sake of correctness it is necessary to remember that there is an example when contrary to the famous radiation embrittlement in metals neutron irradiation at some range of fast neutron doses is in position to improve both the strength and ductility of steel. Foregoing hypothetical assumptions on “low-dose effects” in terms “radiation embrittlement contains oscillatory component” and “radiation annealing of the radiation embrittlement” is questionable and needs additional experimental verification and profound scientific study.


Nanodevices

Session Introduction

Jiangwei Liu
National Institute for Materials Science,
Japan

Title: Hydrogenated diamond MOSFETs and Logic circuits

Biography: Dr. Jiangwei Liu is currently an ICYS researcher at International Center for Young Scientists (ICYS) of National Institute for Materials Science (NIMS), Japan. He received his Ph. D degree from the University of Tokyo in 2012. He worked as a postdoctoral researcher at Wide Bandgap Materials group of NIMS from 2012 to 2013. From 2014, he joined the ICYS at NIMS as an independent ICYS researcher. He is presently interested in diamond power electronic devices. He has authored and co-authored over 30 publications, including one invited book chapter.

Abstract: Diamond is a wide band gap semiconductor. It has some excellent basic physical properties, such as high breakdown field (~10 MV•cm-1), large hole mobility (3800 cm2·V-1·s-1), low dielectric constant (5.7), and high thermal conductively (22 W•cm-1•K-1). These properties make diamond suitable for the fabrication of high-power, high-frequency, and high-temperature electronic devices. Recently, diamond-based metal-oxide-semiconductor (MOS) capacitors and MOS field-effect transistors (MOSFETs) have developed greatly. They were fabricated on p-type boron-doped oxygenated diamond (O-diamond) and hydrogenated diamond (H-diamond) channel layers.1,2 Although thermal stability of the O-diamond is believed better than that of the H-diamond, trap charge density at insulator/O-diamond interfaces and leakage current density of the O-diamond based MOS capacitors are very high. It is still difficult to fabricate high-performance O-diamond based MOSFETs. On the other hand, many successful diamond MOSFETs were fabricated on the H-diamond channel layers. The H-diamond epitaxial layer has a high surface conductivity. The holes are accumulated on the surface with the sheet hole density of 1012~1013 cm-2. Notably, it was reported that the exposure of the H-diamond in NO2 gas could increase the sheet hole density of H-diamond significantly to be as high as 1 × 1014 cm-2.3 Therefore, it is promising to fabricate high performance H-diamond based MOSFETs. In this talk, the fabrication of H-diamond based electronic devices such as MOSFETs and logic circuits will be demonstrated and discussed.4-9


Organic Synthesis of Functional Molecules

Session Introduction

Masaaki Suzuki
Shimane University,
Japan

Title: Syntheses of Aromatic Porphyrinoids Bearing Nonplanar π-Conjugation Networks via Unprecedented Reactivities

Biography: Dr. Suzuki received his Ph.D. in Chemistry from Kyoto University (2007). After performing a postdoctoral research at Department of Chemistry, University of Pennsylvania, he became an assistant professor in Graduate School of Pharmaceutical Sciences, Chiba University (2008). He is currently working as a lecturer in Interdisciplinary Graduate School of Science and Engineering, Shimane University (2015‒).

Abstract: Aromatic compounds, because of their delocalized rich π–electrons, can be promising scaffolds for a variety of applications such as artificial photosyntheses, organic solar cells, photodynamic therapy, and so on. Nonplanarity is an emerging paradigm for this field, because it can resolve their solubility problems and affects their electronic properties. This time, we provides two topics related to synthetic chemistry of nonplanar aromatic molecules. A trifluoromethyl (CF3) group gives a drastic perturbation to an aromatic compound owing to not only the three-dimensional steric bulkiness but also the strong electron-withdrawing characters. When introduced at sterically crowded meso-positions of β–alkyl substituted porphyrins, it is expected to cause major update of both the structural and electronic properties of the molecule. We performed the serendipitous but reproducible formation of meso-CF3 substituted β-octaalkylporphyrins. The structural characterizations by X-ray diffraction analyses revealed their distorted conformations reflecting the steric repulsions around the CF3 groups. In the UV-visible absorption spectra, the lowest energy bands were red-shifted. Bromination reaction is one of the most effective gambits to functionalize aromatic compounds represented by porphyrinoids. Among these, expanded porphyrins that have larger macrocyclic rings than porphyrins are a fascinating class of porphyrin higher analogs on the grounds that the mechanically flexible and chemically sensitive skeletons. We established the bromination reaction of meso-pentakis(pentafluorophenyl)-substituted N-fused [22]pentaphyrin(1.1.1.1.1) under the mild but common conditions and the resulting unprecedented skeletally recombined products including subsequent nucleophilic substitution reactions, which achieved a new kind of three-dimensional zigzag-like delocalization of π-electrons via unusual C-C bond creation.


Applications of Nanotechnology

Session Introduction

Arpita Tiwari
D. Y. Patil University,
India

Title: Magneto-enrichment of genomic calf thymus DNA onto surface functionalized magnetic nanoparticles

Biography:

Abstract: Maximizing DNA adsorption on magnetic nanoparticles (MNPs) is important for their successful utilization in gene transfer, DNA isolation, and bio-analytical applications. This enhancement is typically achieved by BSA @ Fe3O4 and chitosan @silica@ Fe3O4 .We demonstrate a novel route for DNA enrichment on BSA @ Fe3O4 and chitosan @silica@ Fe3O4 nanoparticles by applying magnetic field over specific period of time. The results suggested that by applying magnetic field in range of 3-4 minutes, the enrichment of almost 100% genomic DNA could be achieved, and hence giving almost 500th fold enhancement of DNA concentration in real samples. The major force involved and responsible is also discussed and an attempt to calculate the possible force acting on DNA-Magnetic nanoparticle complex is also done. The proposed method and the in-depth insight of possible forces involved in magnetic enrichment by magnetic nanoparticles can be beneficial in the designing systems for various biomedical applications.


Graphene Technologies

Session Introduction

Elaheh K. Goharshadi
Ferdowsi University of Mashhad,
Iran

Title: Transport Properties of Nanofluids Containing Graphene-Based Nanomaterials

Biography: Professor Elaheh K. Goharshadi received her Ph. D (Shiraz University– 1995). She joined the Ferdowsi University of Mashhad for Physical Chemistry in 1996 as a faculty member. She is the author of more than 100 scientific articles and 5 books. Her work focuses on the experimental and theoretical work on nanotechnology.

Abstract: Nanofluids, suspensions of nanomaterials in a base fluid, have various superior properties compared with those of their base fluids. The distinguished features of nanofluids make them potentially useful in several applications such as in cooling of electronic equipment, vehicle engines, nuclear reactors, biomedical engineering, and energy efficiency enhancement. Among all the physical properties of nanofluids, the transport properties are the most important for many applications [1]. Highly stable graphene and graphene oxide (GO)-based nanofluids were prepared without using any surfactant. Electrical conductivity (EC), thermal conductivity (TC), and rheological properties of the nanofluids were measured at different mass fractions and various temperatures. The viscosities of ethylene glycol (EG), glycerol, and GO/EG and graphene/glycerol nanofluids as functions of shear rate and temperature were measured. The results showed that the viscosity of nanofluids decreased nonlinearly with increasing shear rate at low shear rates indicating the strong “shear-thinning” behavior. This shear thinning behavior becomes more pronounced at the higher GO or graphene concentrations due to the stronger sheet–sheet and multi-sheet interactions with the increase in concentrations. 401.49% enhancement in viscosity of glycerol was achieved by loading of 2% graphene nanosheets at shear rate 6.32 s-1 and 20 oC. GO/EG nanofluids exhibited a non-Newtonian shear thinning behavior followed by a shear-independent region. The EC of GO/distilled water increased linearly with increasing mass fraction of GO and it reached to about 232 μS/cm for a mass fraction of 0.0006 at 25 °C. 25,678 % enhancement, in EC of distilled water was observed by loading 0.0006 mass fraction of GO at 25 oC. Maximum of ca. 30 % enhancement in TC was achieved for GO/EG nanofluid with mass fraction of 0.07.


Junji Haruyama
Aoyama Gakuin University,
Japan

Title: Electronic and magnetic behaviors of 2D atom-thin layers: Graphene, black phosphorus, hexagonal boron-nitride, and MoS2

Biography: Junji Haruyama graduated from Waseda University, Tokyo, Japan, in 1985. Right after then, he joined Quantum device laboratory, NEC Corporation, Japan and worked until 1994. He received PhD in physics from Waseda University in 1996 by so many famous obtaining at NEC. During 1995–1997, he worked with the University of Toronto, Canada(Prof. J. Xu Lab), and also Ontario Laser and Lightwave Research Center (Canada) as a visiting scientist. Since 1997, he has worked at the present Aoyama Gakuin University as a professor until now. He was also a visiting professor at NTT Basic Research Laboratories (Dr. Takayanagi’s Nano-science Lab), Institute for Solid State Physics (Prof. Iye’s Nano-science Lab), The University of Tokyo, and Zero-emission Energy Center, Kyoto University, Japan. He has been also a principal researcher at Air-Force Office of Scientific Research (AFOSR), USA, since 2010. He has peer review publications over 100 and 4 patents, and also invited talks over 150. He has been also a (co)author of books over 30, a referee of Journals over 50, and a member of international committees (organizer, adviser, chairman) over 30 conferences

Abstract: Two-dimensional (2D) atom-thin layers have attracted significant attention after the discovery of primitive fabrication method of graphene, mechanical exfoliation of graphite using scotch tapes. As a van-deer Waals engineering, various atom-thin layers and those hybridization have been recently realized. In the talk, first, I present magnetism and spintronics arising from edges of 2D atom-thin layers, graphene [1], few-layer black phosphorus (BP) [2] and hexagonal boron-nitride (hBN) [3]. I create nanomesh (NM) structures, consisting of honeycomb like array of hexagonal pores, with specified pore-edge atomic structure (i.e., zigzag type) on individual layers. Interestingly, hydrogen-terminated graphene NM (H-GNM) shows flat-band ferromagnetism, while it disappears in oxygen-terminated GNM. On the other hand, O-BPNM exhibits large ferromagnetism due to ferromagnetic spin coupling of edge O-P bonds, whereas it is eliminated in H-BPNM. O-hBNNM also shows large ferromagnetism due to edge O-B and O-N bonds, while it disappears in H-hBNNM. These are also highly sensitive to annealing temperatures to form zigzag pore edge. These open a considerable avenue for realizing 2D atom-thin flexible magnetic and spintronic devices, fabricated without using rare-earth magnetic atoms. Second, I show creation of the world-thinnest Schottky junction on few-layer molybdenum disulfide (MoS2), one of the transition metal dichalcogenides [4]. The 2H-phase of MoS2 has direct ban gaps of 1.5−1.8 eV. It is demonstrted that electron-beam (EB) irradiation to the 2H-phase causes semiconductor-metal transition to 1T-phase and atomically-thin Schottky junction with barrier height of 0.13−0.18 eV is created at the interface of 2H/1T regions. This findings also indicate a possibility that the effective barrier height is highly sensitive to electrostatic charge doping and almost free from Fermi-level pinning when assuming predominance of the thermionic current contribution. This EB top-down patterning opens the possibility to fabricate in-plane lateral heterostructure FETs, which have shown promising scaling prospects in the nanometer range, and/or local interconnects directly with metallic phase (1T) between (2H)MoS2 transistors, resulting in ultimate flexible and wearable in-plane integration circuits without using 3D metal wirings. Finally, I will also briefly talk about introduction of Rashba-type spin-orbit interaction (SOI) into graphene realized only by the out-of-symmetry breaking through much light hydrogenation (< 0.1%) [5]. Symmetric internal magnetic field introduced by the SOI tends to induce spin phase coherence in weak localization in the graphene.


Biomaterials and Polymer Chemistry

Session Introduction

Tetsu Mitsumata
Niigata University,
Japan

Title: Magnetic Responsive Soft Composites with Variable Elasticity

Biography: He received his PhD degree in polymer science from Hokkaido University in 1999 under the direction of Profs. Y. Osada and J. P. Gong. After the PhD, he studied stimuli-responsive polymer gels at the Graduate School of Science and Engineering, Yamagata University as assistant professor. In 2002, he joined the laboratory of Dr. P. De Kepper of CRPP Bordeaux in France. Now, He is working at the Graduate School of Science and Technology, Niigata University. He has published more than 75 scientific papers, 29 review papers and books, and 11 patents dedicated to soft materials, especially magnetic responsive gels or elastomers.

Abstract: Magnetic responsive soft composite that alters the viscoelastic properties in response to the magnetic field has been investigated [1-4]. The magnetic soft composite consists of magnetic particles and polymer matrix such as polymer gels or elastomers, which is called magnetic elastomer in this study. Typical for MR soft composites, the diameter of magnetic particles is in several microns. When a magnetic soft composite is put in a magnetic field, the elastic modulus increased. The storage modulus for the magnetic elastomer without magnetic fields (0 mT) was ~104 Pa and it rapidly increased to ~1.5 MPa when a magnetic field of 500 mT was applied [5]. The magnetic elastomer exhibited a reversible increase by factors of 277 of the storage modulus and 96 of the loss modulus upon the magnetic field, which were nearly the same level with magnetic hydrogels demonstrating the giant magnetorheology [6]. This MR effect maintained the magnetic field response for half year after the synthesis. In addition, the magnetic elastomer underwent high mechanical toughness with a breaking strain exceeding 0.8, and did not show a permanent deformation after removing the strain. We have also tried to improve the MR property of magnetic elastomers. A typical example is bimodal magnetic elastomers mimetic to sea cucumber, which consist of magnetic particles (iron) and nonmagnetic particles (ZnO) [7]. The relative change in the Young’s modulus at 320mT for the monomodal magnetic elastomer was 1.8 and it was raised to 5.8 only by mixing with the nonmagnetic particles of 9.6 vol%, originating from the stress transfer by the additional chains of magnetic particles via nonmagnetic particles. The MR property of various magnetic soft composites [8] and their recent applications as actuators will be presented.


Energymaterials

Session Introduction

Goutam Kumar Dalapati
Institute of Materials Research and Engineering (IMRE),
Singapore

Title: Earth abundant materials and nanoscale interface engineering for energy harvesting and saving applications

Biography: Dr. G. K. Dalapati he has been with the Institute of Materials Research and Engineering (IMRE), A*STAR, (Agency for Science, Technology and Research) Singapore, as a scientist, since 2007. He is currently engaged in the research of thin film solar cells using earth abundant and non-toxic materials (such as beta phase FeSi2, CuO, CZTS), solar hydrogen production for renewable energy application, copper based heat rejection coating, low-emission glass coating, atomic layer deposited dielectrics for electronic and optical applications, and integration of III-V/Ge for logic and memory application. He is the author or coauthor of more than 100 scientific journal papers in the pretentious journal including Scientific Reports, Prog. In Photovoltaic, ACS applied materials and etc. His research work on low cost solar cells highlighted in A*Star research. G. K. Dalapati received the B.Sc. degree (with honors) in physics and the M.Sc. degree in electronics science from the University of Calcutta, Calcutta, India, in 1998 and 2000, respectively, and the Ph.D. degree from the Jadavpur University, Calcutta, in 2005. From 2004 to 2005, he was a Research Associate at the Microelectronics Technology Group, School of Electrical, Electronics, and Computer Engineering, University of Newcastle-upon-Tyne, U.K. His area of research work was in process optimization of strained-Si MOSFETs device for future CMOS technology. From 2005 to 2006, he was with the Silicon Nano Device Laboratory, Department of Electrical and Computer Engineering, National University of Singapore, Singapore, on advanced gate stack using high-κ gate dielectrics and high mobility channel materials.

Abstract: Metal oxides and silicides are environmentally friendly, nontoxic and abundant in resources. In spite of having low power conversion efficiencies when compared to theoretical values, there is much scope to further improve the efficiency. In the present work, we have demonstrated a simple approach to fabricate silicon based solar cells by employing iron silicide thin films. We have also investigated optical and electrical properties of sputter deposited CuO films for thin film solar energy harvesting application. Impact of rapid thermal annealing on crystal quality and phase transform have been discussed in details. Nanocrystal Engineering of sputter-grown CuO photocathode for visible-light-driven electrochemical water splitting will be discussed. In this talk, importance of in-situ interface engineering to enhance CuO based solar energy conversion will be discussed in details. In addition, heat rejection coating by using TiO2 and Cu thin film metal will be discussed for energy saving applications. TiO2/metal/TiO2 structure reflects infrared radiation in the solar spectrum where as it allows visible transmission, thus, it is a potential candidate for residential smart windows application.