Day 1 :
Keynote Forum
Ashok Vaseashta
Claflin University, USA
Keynote: Aquatic ecotoxicity assessment of nanoparticles
Time : 9:00-9:30
Biography:
Prof. Vaseashta received a PhD from the Virginia Polytechnic Institute and State University, Blacksburg, VA in 1990. He currently serves as Vice Provost for Research at Claflin University and Strategic Advisor/Fellow at the Institute for Advanced Sciences Convergence and International Clean Water Institute at Norwich University Applied Research Institutes. Previously, he served as a Professor of Physics and Physical Sciences and Director of Research at the Nanomaterials Processing and Characterization Laboratories, Graduate Program in Physical Sciences at Marshall University. Concurrently, he holds a visiting/distinguished Professorship at the 3 Nano-SAE Research Centre, University of Bucharest, Romania; Academy of Sciences of Moldova, Chisinau, Moldova; and at the Helen and Martin Kimmel Center of Nanoscale Science at the Weizmann Institute of Science, Israel. In 2007-08, he was detailed as a William C. Foster fellow to the Bureau of International Security and Nonproliferation at the US Department of State working with the Office of Weapons of Mass Destruction and Terrorism and Foreign Consequence Management program. He also served (2009-13) as Franklin Fellow and strategic S&T advisor in the office of Verification and Transparency Technologies/Arms Verification and Control in the Bureau of Arms Control Verification and Compliance, Office of Verification and Transparency Technologies at the US Department of State. He is a fellow of the American Physical Society, Institute of Nanotechnology, and New York Academy of Sciences. He was awarded Gold medal by the Armenian National Polytechnic University (formerly State Engineering University of Armenia) for his contribution to Nanotechnology. In addition, he has earned several other fellowships and awards for his meritorious service including 2004/2005 Distinguished Artist and Scholar award. His research interests include; counterterrorism, unconventional warfare, critical-Infrastarture protection, biosecurity, advanced and nano materials for development of chemical-bio sensors/detectors, environmental pollution monitoring/detecting and remediation, and green nanotechnology. He authored over 200 research publications, edited/authored six books on nanotechnology, presented many keynote and invited lectures worldwide, served as the Director of four NATO Advanced Study Institutes/Advanced Research workshops supported by Emerging Security Challenges Division of the Science for Peace and Security, and co-chair of an International Symposium on Nanotechnology and Environmental Pollution Prevention (ISNEPP). He led the U.S. position on Nanotechnology in High Technology Coordination Group to joint US and India delegation. In addition, he served as a member of the U.S. Department of Commerce, NIST, and ANSI delegation to the U.K. representing the U.S. position on Standards in Nanotechnologies at the inaugural meeting of the ISO/TAG to TC-229. He is a member of NATO-SET-040, an exploratory team panel investigating security and surveillance applications of nanotechnology. He serves as an expert counsel to the UNESCO, ObservatoryNANO, and COSENT – south-east consortium on Nanotechnologies on NANO-Science and Technologies. He is an active member of several national and international professional organizations.
Abstract:
Clean water is at the very core of human survival.Aquatic contamination occurs for multiple reasons ranging from taking the water sources for granted, negligence in waste disposal, deliberate contamination, and technological innovations outpacing development of effective guidelines for life-cycle management and regulations to properly recycle/reuse/dispose commercial products, especially prepared using nanoparticles. Elsewhere, we presented potential toxicity of nanosizedparticles of stannum dioxide, cerium dioxide, silver and iron oxide using model of the sea urchin Paracentrotuslividus, Zebra Fish and theiroff springs. Passage through membranous barriers via the digestive tract to the coelomic fluid is the subject of ongoing study using biomarkers, such as coelomic fluid inside coelomocytes (uptake), cholinesterase activity, and using expression of stress-related proteins (HSP70) and Gonads morphological features.A strategic S&T focus of the ICWI is to identify, assess, and recommend revolutionary conceptual Chem.-Bio Defense solutions and provide strategic solution pathways using field-ready technologies. Ongoing research aims to detect, counter, and mitigate potential security threats and is at the core of our current and ongoing investigations. Aquatic (nano)ecotoxicity is arguably the least understood and requires systematic investigation. An outline of dispersion and characterization methodologies of harmful NPs (weaponized NPs)in different aqueous media will be presented along with acute toxicity and risk assessment methodologies. We present our research activities on genotyping and sequencing genetically modified biological systems which are crucial to identify such risks, and trophic transfer and biosecurity implications of NPs and GMOs dispersed intentionally.
Keynote Forum
Hari Shanker Sharma
Uppsala University, Sweden
Keynote: Nanodelivery of a multimodal drug Cerebrolysin reduces brain pathology following amyloid beta peptide infusion induced Alzheimer’s disease
Time : 9:30-10:00
Biography:
Hari Shanker Sharma, (Swedish Citizen), Director of Int. Expt. CNS Injury & Repair (IECNSIR); Professor of Neurobiology (MRC); Docent in Neuroanatomy (UU) is currently working in Uppsala University Hospital, Department of Surgical Sciences, Division of Anesthesiology & Intensive Care Medicine, Uppsala University, Sweden. Dr Sharma obtained his Ph D in Neuroscience in 1982 from Banaras Hindu University, Varanasi, India and Dr med Sci from Uppsala University in 1999. He has published over 300 peer reviewed research articles (ISI database h-index 36) related to Neuroprotection and Neuroregeneration in relation to the Blood-brain barrier in stress, trauma, and drugs of abuse in health and disease. His research on brain pathology and neuroprotection in different model is supported by Laerdal Foundation of Acute Medicine, Stavanger, Norway; role of nanoparticles in neurodegeneration and Neuroprotection for treatment strategies from European Aerospace Research & Development (EOARD), London, UK and US Air Force Research Laboratory, Wright Patterson Air Force Base, Dayton, Oh, USA; drug abuse research and neuroprotection from National Institute on Drug Abuse (NIDA); National Institute of Health (NIH).\\r\\n
Abstract:
Alzheimer’s Disease (AD) induced brain pathology is instrumental in causing functional and behavioral disturbances in patients. Research reports in AD suggest deposition of amyloid-ï¢-peptide (ABP) within the brain could be instrumental in precipitating the pathophysiology of AD. Chronic intracerebroventricular infusion of ABP in rats thus results in AD like symptoms in rat model. To reduce the toxic effects of ABP and to enhance neurorepair we used a multimodal drug Cerebrolsyin (Ever NeuroPharma) that is a balanced composition of various neurotrophic factors and active peptide fragments in our AD model. Infusion of ABP (1-40) intraventricularly (i.c.v.) in the left lateral ventricle 250 ng/10 µl once daily for 4 weeks resulted in ABP deposits in cortex and in hippocampus and associated with an increased glial fibrillary acidic protein (GFAP) immunoreactivity, loss of myelin basic protein (MBP) and leakage of albumin in these brain areas. Nissl stain showed marked neuronal loss or distortion in areas showing ABP deposition. The behavioral disturbances on Rota Rod performances and inclined plane angle tests showed significant deterioration along with the ability to retrieve platform in water maze tests in ABP infused rats.\\r\\n\\r\\nInfusion of Cerebrolysin (25 µl, i.c.v.) starting from 1 week after the onset (but not 2 weeks) of ABP infusion daily and terminated 1 week before ABP last infusion, significantly reduced brain pathology improved the behavioral functions. Interestingly, TiO2-naonowired Cerebrolsyin administration 2 weeks after ABP infusion daily for 1 week only resulted in marked neuroprotection and significantly improved behavioral functions. Our observations clearly suggest that (i) Cerebrolsyin administration if given during a critical therapeutic time window is able to attenuate AD pathology, and (ii) nanodelivery of cerebrolysin has superior effects and extended therapeutic window in AD. The possible mechanisms and functional significance of our findings will be discussed.\\r\\n\\r\\n*Supported by grants from the Air Force Office of Scientific Research (EOARD, London, UK), and Air Force Material Command, USAF, under grant number FA8655-05-1-3065; Swedish Medical Research Council (Nr 2710-HSS).\\r\\n
Keynote Forum
Mahi R Singh
Western University, Canada
Keynote: Study of quantum optics in metamaterial nanostructures
Time : 10:00-10:30
Biography:
Abstract:
We study the photoluminescence (PL) and spontaneous emission of semiconductor nanoparticles doped in a metamaterial heterostructure. Metamaterials are a new class of artificial materials with optical properties determined by their classical atomic composition and nanoscale organization of their structural components. Metamaterials have unique electromagnetic properties which cannot be obtained from naturally occurring materials. Recently, metamaterials based on periodic arrangements of metallic nanocomposites have received special attention. They possess simultaneously negative effective dielectric permittivity and magnetic permeability for a range of frequencies in the electromagnetic spectrum. It is well known that the negative electric permittivity in noble metals leads to the formation of surface plasmon which may generate exceptionally strong localized electromagnetic fields. Heterostructures studies here are formed by fabricating a split-ring resonator and metallic rod metamaterial on a dielectric substrate. An ensemble of quantum dots (QDs) is doped near the interface in the heterostructure. The QDs interact with surface plasmon polaritons of the heterostructure. PL spectrum and spontaneous decay of excitons in the QD are studied. Our results indicate that the PL and spontaneous emission of the QDs are enhanced in the presence of the metamaterial when the exciton and surface plasmon frequencies are resonant. These findings are consistent with recent experimental studies. The present study can be used to make new types of nanoscale optical devices for sensing, switching and imaging applications based on metamaterials.\\\\r\\\\n
Networking & Refreshment Break 10:30-10:45 @ Foyer
- Track 1: Advanced Nanomaterials
Chair
Sabyasachi sarkar
Indian Institute of Engineering Science and Technology, India
Session Introduction
Kimihisa Yamamoto
Tokyo Institute of Technology, Japan
Title: Synthesis of sub nano-size metal particles using a nano-reactor
Time : 10:45-11:05
Biography:
Kimihisa Yamamoto received PhD degrees from Waseda University in Polymer Chemistry in 1990. He joined the Department of Chemistry at Keio University from 1997 as professor. Currently, he is a professor in the Chemical Resources Laboratory, Tokyo Institute of Technology since 2010. His present research interests are in developing supra-metallomolecules for nanosynthesizers involving nanoparticles, subnanoparticles and superatoms.
Abstract:
We show that tinchlorides, SnCl2 and FeCl3 complexes to the imines groups of a spherical polyphenyl- azomethine dendrimer in a stepwise fashion according to an electron gradient, with complexation in a more peripheral generation proceeding only after complexation in generations closer to the core has been completed. The metal-assembly in a discrete molecule can be converted to a size-regulated metal cluster with a size smaller than 1 nm as a molecular reactor. Due to the well-defined number of metal clusters in the subnanometer size region, its property is much different from that of bulk or general metal nanoparticles. Dendrimers are highly branched organic macromolecules with successive layers or “generations†of branch units surrounding a central core. Organic inorganic hybrid versions have also been produced, by trapping metal ions or metal clusters within the voids of the dendrimers. Their unusual, tree-like topology endows these nanometre-sized macromolecules with a gradient in branch density from the interior to the exterior, which can be exploited to direct the transfer of charge and energy from the dendrimer periphery to its core. Here we show that tin ions, Sn2+, complex to the imines groups of a spherical polyphenylazomethine dendrimer in a stepwise fashion according to an electron gradient, with complexation in a more peripheral generation proceeding only after complexation in generations closer to the core has been completed. By attaching an electron-withdrawing group to the dendrimer core, we are able to change the complexation pattern, so that the core imines are complexed last. By further extending this strategy, it should be possible to control the number and location of metal ions incorporated into dendrimer structures, which might and uses as tailored catalysts, building blocks, or fine-controlled clusters for advanced materials(Figure 1).
Theoni K. Georgiou
Imperial College London, London
Title: Well-defined thermo responsive polymers as injectable gels
Time : 11:05-11:25
Biography:
Theoni obtained a BSc in Chemistry from the University of Cyprus in 2001, followed by a PhD in 2006 in Polymer Chemistry entitled “Star polymers for gene delivery and star-based polymeric networks†under the supervision of Professor Costas Patrickios. She then worked as a Postdoctoral Fellow with Professor Antonios G. Mikos at the Department of Bioengineering at Rice University in the USA. She worked on “Polymeric materials for tissue engineering†and on “Degradable polymers for gene deliveryâ€. In October 2007, after she was awarded an RCUK Academic Fellowship, she moved to UK to join the Department of Chemistry at the University of Hull. In January 2014 she joined the Department of Materials at Imperial College. Her research interests involve synthesis and characterisation of polymers and their evaluation in a variety of applications like drug delivery, gene delivery, photothermal therapy etc. She is also interested in the self-assembly of multiblock copolymers, gels and stabilising dispersions or particles by using polymeric macrosurfactants.
Abstract:
Thermoresponsive polymers have a broad range of biomedical applications including tissue engineering as injectable gels. In our group we have synthesised and characterised a variety of thermoresponsive multiblock copolymers where the structural parameters (molecular weight, composition, architecture, chemistry) where systematically varied. These structural parameters of the polymers affected the physical-chemical properties of the polymers and their self-assembly behaviour as well as their ability to form injectable gels. For example the optimum molecular weight was found to be around 7000 g/mol and the optimum hydrophobic content around 35 wt%. Interestingly the architecture, specifically the position of the hydrophobic block within the polymer also influenced the thermoresponsive, sol-gel transition of the polymer and it was demonstrated that the best transition was achieved when the hydrophobic block was in the middle of the polymer. In summary the results were able to demonstrate that the gelation temperature can easily be tailored that is essential for the application.
Balint Nafradi
Ecole Polytechnique Fédérale de Lausanne, Switzerland
Title: Long, 140 ns electron spin lifetime in chemically synthesized graphene and related nanostructures and its strong interplay between the surface bound oxygen
Time : 11:25-11:45
Biography:
Bálint obtained aa Ph.D. in 2004 in Physics from the EcolePolytechniqueFédérale de Lausanneunder the supervision of Prof. LászlóForró. He then worked as a Postdoctoral Fellow with Professor Bernhard Keimer at the Max Planck Institute for Solid State Research in Stuttgart, Germany. He obtained the Fellowships for prospective researchers of the SNSF. Since 2011 he is a scientist at the Institute of Condensed Matter Physics of Ecolepolytechniquefédérale de Lausanne. His research interest involves spintronics and quantum magnetism. He is also interested in carbon nanomaterials and organic-inorganic halide perovskites.
Abstract:
The electron spin lifetime in an assembly of chemically synthesized graphene sheets was found to be extremely long at room temperature but also extremely sensitive to oxygen. Introducing small concentrations of physisorbed O2 onto the graphene surface reduced the exceptionally long 140 ns electron spin lifetime by an order of magnitude. This effect was completely reversible: removing the O2 by dynamic vacuum restored the spin lifetime. The presence of covalently bound oxygen also decreased the electron spin lifetime in graphene, although to a far lesser extent compared to physisorbed O2. The conduction electrons in graphene were found to play a significant role by counter-balancing the spin depolarization caused by oxygen molecules. Our results highlight the importance of chemical environment control and device packing in practical graphene based spintronic applications.
Hiroyuki Wada
Tokyo Institute of Technology, Japan
Title: Photodynamic therapy of upconversion nanoparticlesprepared by laser ablation in liquid
Time : 11:45-12:05
Biography:
Hiroyuki Wada is an associate professor of Department of Innovative and Engineered Materials, Tokyo Institute of Technology (2005 to preset). His research is related to optical nanoparticles. He received the Bachelor of Engineering in 1990, Master of Engineering in 1992 from Tokyo Institute of Technology. He was a researcher of Sony Corporation and investigated laser and laser process (1992–2005). He was a visiting researcher of Stanford University in 2001. He received Doctor of Engineering in 2003 from Tokyo Institute of Technology. He was a visiting professor of Carnegie Mellon University (2006–2007).
Abstract:
In recent years, extensive research on nanoparticles has been conducted due to their unique physical properties and potential applications. Many nanoparticles preparation techniques such as precipitation method exist. One of unique methods is ‘laser ablation in liquid,’ which creates nanoparticles by the irradiation of focused pulse laser to a target in liquid. The prepared nanoparticles are highly crystalline. Multielement nanoparticles are easily prepared by this method. One of attractive nanoparticles is upconversion one. Upconversion nanoparticles emit visible light by an excitation of near-infrared (IR) light. Study on solar cell showed increase in the conversion efficiency by wavelength conversion of light from IR to visible region. Study on cancer treatment using photodynamic therapy (PDT) indicated that irradiation of near-IR light to cancer cells solved the problems. In this talk, preparation of upconversion nanoparticles and application in biomedical fields related to our studies were reviewed. Upconversion nanoparticles were prepared by laser ablation in liquid. Target Y2O3:Er,Yb was prepared by co-precipitation method. Laser was Nd:YAG/SHG. Prepared nanoparticles were investigated by XRD, SEM, STEM and DLS. Optical properties were measured by fluorospectrometer. In-vitro experiments using cancer cells were performed to examine the effect of PDT. XRD patterns showed highly crystalline Y2O3:Er,Yb nanoparticles without byproducts were prepared by this method. SEM images indicated that coarse and fine nanoparticles were prepared at the same time. Upconversion spectra showed that typical red and green emission of Er3+ was observed at an excitation of near-IR light. Cancer cells were killed irradiation of near-IR to upconversion nanoparticles and photosensitizer
Mehdi Saeidmanesh
UniversitiTeknologi Malaysia, Malaysia
Title: Channel length modulation effect on monolayer graphene nanoribbon field effect transistor
Time : 12:05-12:15
Biography:
Recently, Graphene Nanoribbon Field Effect Transistors (GNR FETs) is attracting a great deal of attention due to their better performance in comparison with conventional devices. In this paper, channel length Modulation (CLM) effect on the electrical characteristics of GNR FETs is analytically studied and modeled. To this end, the spatial distribution of the electric potential along the channel and current-voltage characteristic of the device are modeled. The obtained results of analytical model are compared against the experimental data of published works. As a result, it is observable that considering the effect of CLM, the current-voltage response of GNR FET is more realistic.
Abstract:
Mehdi Saeidmanesh is a PhD student at UniversitiTeknologi Malaysia (UTM),Faculty of Electrical Engineering, Computational Nanoelectronics Research Group (CoNE). His research interest includes analytical modeling of graphene based devices such as graphene FETs, and graphene gas/bio sensors. He has managed to publish more than 20 papers in reputed journals as the first and co-author.
- Track 2: Nanomaterials Fabrication, Characterization and Tools
Chair
Michael Hietschold
Chemnitz University of Technology, Germany
Session Introduction
Beata Kalska-Szostko
University of Bialytsok, Poland
Title: Hierarchical nano- or bio-composites based on magnetic nanostructures
Time : 12:15-12:35
Biography:
Beata Kalska-Szostko Professional Experience Include: 2003 - now: University of Bialystok, Institute of Chemistry, adiunkt. Set- up of the nanotechnology laboratory. The experimental work on synthesis and electrodeposition of nanomaterials. Structural and magnetic characterization of the nanomaterials. Experience in: - synthesis of the nanoparticles, - electrodeposition of the nanowires, - scanning electron microscopy, - atomic force microscopy, - Mssbauer spectroscopy. 2001 - 2003: Free University Berlin, Institute of Experimentalphysics, post-doc. Participation in the RTN European network "Correlation of Structure and Magnetism in Novel Nanoscale Magnetic Particles". The experimental work on magneto-optical characterization of the nanoparticles. In addition experience in the molecular beam epitaxial deposition, ultra high vacuum techniques, ie. characterization by Auger electrons, in situ atomic force microscopy, RHEED. 1998 - 2000: Uppsala University, Department of Physics, Ph.D studies. Experimental work on characterization by Mössbauer spectroscopy and x-ray difractometry various materials like: bulk, multilayers, thin films, nanoparticles, batteries, gas sensors etc. Transmission electron microscopy, SQUID, XRD courses. Research Grants/Fellowships: 2001-2003 Freie Universitst Berlin, 30 months fellowship from the network "Correlation of Structure and Magnetism in Novel Nanoscale Magnetic Particles" 1996 Uppsala University - 4 months TEMPUS fellowship Publications 42 - publications in the international journals 55 - presentations and abstracts on the international conferences
Abstract:
It can be seen that from the last decade of previous centaury a vase number of investigations is dedicated to nanomaterials and their unusual properties. Recently, however researches went further and start to combine few nanostructures in one hierarchical formation. Among others biorelated nanocomposites become driving force for huge number and very promising investigations. For example combination of the magnetic nanostructure nanowires or nanoparticles with bioactive molecules leads to a novel hybrid system which combine properties of nanostructures and bioparticle in one spices. In such manner specific recognition or catalytic properties of biomaterials are convoluted with the attractive electronic, optical, magnetic and structural characteristics of magnetic spices. To obtain functional biocomposite, nanostructures should be properly characterized from the structural and magnetic point of view. In addition it should be modified in special manner at the surfaces what can be realized by bonding or adsorption of various linkage chemistries. The drawback is that practically each application needs its own surface characteristic and activity. Therefore functional compounds can be directly bonded with organic molecules or via interconnectors. The other option is non-covalent interactions with for example fatty acids or proteins. Different ligands -SH, -COOH, -OP, -CN with different affinity either to the modified surfaces or bioparticles can be obtained. The reason why magnetic nanostructures with especial emphasis on nanowires and nanoparticles are considered as a promising candidate of biocomposite constituents is their easily modulated magnetic properties, which gives access to the fast and easy manipulation tool via use of the external magnetic field. Structural and magnetic properties of the presented magnetic nanowires and composites will be discussed on base of result obtained by: XRD, TEM, IR and Mössbauer spectroscopy.
Werner Lottermoser
Salzburg University, Austria
Title: Application of a difference electron nanoscope (den): correlation between 3d magnetical structures of synthetic fayalite with synchrotron and neutron diffraction and mössbauer spectroscopy part ii
Time : 12:35-12:55
Biography:
Werner Lottermoser has completed his thesis work about neutron diffraction and magnetism of special silicates from Francfort University (Germany) and university lecturing qualification on Single Crystal Mössbauer Spectroscopy (SCMBS) in 1996 from Salzburg University (Austria). He is now working on sub-nanometric imaging, nanomaterials and materials for industrial applications. He has published more than 65 papers in reputed journals and 150 abstracts and has been serving e.g. for one year as a referee board member at the Journal of Physical Chemistry A. Recently, he was awarded the Austrian Staatspreis for Innovation together with AB-Microelectronics, Salzburg
Abstract:
The evaluation of a 3-dimensional orientation of magnetic moments in solids is still a challenging problem in modern solid state physics and crystallography. Common methods to arrive at this goal are neutron diffraction, magnetometry and Single Crystal Mössbauer Spectroscopy (SCMBS). However, each of these methods have their limitations, viz. antiphase domains, magnetical impurities a.s.o. X-ray and synchrotron diffraction may provide valuable insights in crystallographic structures, but the separation of the magnetically effective 3d electrons is hardly possible with the latter methods. The synthetic fayalite Fe2SiO4 is a model system for a rather complicated 3D magnetic structure (collinear antiferromagnetic AF on the two relevant crystallographic sites at 65K but canted only on the M1 site with a temperature-dependent canting angle below 65K). These neutron diffraction results could be verified by SCMBS and DFT calculations via the determination of the electric field gradient efg with high accuracy. By the recently presented Difference Electron Nanoscope (DEN) we are now able to combine spectroscopic and diffractometric data in order to see this efg together with surrounding 3d-electron clouds floating in the fayalite unit cell and the relevant internal magnetic fields correlated with the moments. The previously presented 3D images for the M1 position (Omics conf. at San Antonio 2014) are herewith completed for the M2 site.
Yuko S. Yamamoto
Kagawa University, Japan
Title: Usefulness of Galvanic Displacement Reactions to Efficiently Fabricate Metal Nanostructures for Surface-enhanced Spectroscopy
Time : 13:40-14:00
Biography:
Yuko S. Yamamoto is currently a Restart Postdoctoral fellow (RPD) of Japan Society for the Promotion of Science (JSPS), at Kagawa university (2014-). She has completed her Ph.D in chemistry (2011) from Kwansei Gakuin University. She trained Raman spectroscopy and surface-enhanced Raman spectroscopy under the supervision of Prof. Yukihiro Ozaki and Prof. Tamitake Itoh, respectively. Her present research interests are plasmon-enhanced spectroscopy and chemical reactions on plasmonic nanomaterials (plasmonic chemistry).
Abstract:
The importance of nanostructures made by plasmonic metals e.g. silver or gold, has been recognized by many researchers because plasmon resonance of such nanostructures, which is a resonant oscillation of conduction electrons stimulated by incident light, causes unique plasmonic properties including surface enhanced spectroscopy, acceleration of photo-catalysis and photo-thermotherapy. Controlling the synthesis and assembly of those metallic nanostructures has been of particular interest and several methods e.g. random/self-assembly, bond formation and nanolithography, are well established. However, these methods have limitations for fabrication cost and time, thus, more efficient techniques are required to satisfy the basic industrial needs. In recent years, galvanic displacement reaction (GDR) is rediscovered as a rapid and cost-effective technique for preparing various plasmonic nanostructures. Various kinds of nanostructures have been synthesized by GDR, however, most previous works have some limitations in creating efficient plasmonic nanostructures because during GDR processes, nanostructures tend to elongate and overlap with each other, preventing efficient production of plasmonic hot spots. To solve this problem, we introduced a novel GDR for the synthesis of silver nanohexagonal thin columns (NHCs). NHCs synthesized generate strong surface-enhanced Raman scattering signals of adsorbates, thus, they have a potential to be used widely across industry. Multi-elements depth profile analysis of NHCs by X-ray photoelectron spectroscopy shows that NHCs have a less conductive layer on their outermost surface, resulting that NHCs are kept from fusion and high-density plasmonic hot spots remain. Refs. (1)YS Yamamoto et al., Phys.Chem. Chem. Phys., 2013, 15, 14611. (2)YS Yamamoto et al., to be submitted.
Michael Hietschold
Chemnitz University of Technology, Germany
Title: Pattern Control in Molecular Self-Assembly
Time : 14:00-14:20
Biography:
Michael Hietschold studied physics and completed Ph.D. 1976 at Technical University Dresden, Germany. He was a postdoc at Moscow State Lomonosov University, Soviet Union. Since 1993, he is a professor at Technische Universität Chemnitz, Germany. His research interests are surface physics, nanophysics and ultramicroscopy. He was guest professor at the National University Ho Chi Minh City, Vietnam, and also lecturing at Portland State University, Oregon, USA. Since 2008 he is advisor for the National Metals and Materials Technology Center (MTEC), Pathumthani, Thailand. He is a referee for many international scientific journals and funding organizations and has published more than 200 scientific papers.
Abstract:
The investigation of self-assembled adsorbate structures on crystalline substrate surfaces is a classical topic of surface physics which has been dominated for a long time by diffraction techniques. The appearance of scanning probe microscopes – especially scanning tunneling microscopy (STM) – has opened the fascinating opportunity of direct real-space imaging with atomic or submolecular resolution. At the interface between a solution and a crystalline solid solute (and sometimes also solvent) molecules may deposit in an ordered manner at the solid substrate surface. In-situ studies of the adsorption pattern created this way are possible by ambient STM with the tip immersed in a deposited solution droplet. As an example, trimesic acid (TMA) molecules solved in alkanoic acids may arrange in open adsorption patterns (chicken wire and flower structures) due to H bonding via carboxylic functional groups. At the liquid-solid interface, such type polymorphism may be controlled by the nature of the solvent as well as the concentration of the solutions which opens access to further novel structures. By a controlled increase of molecular packing density of solutions of TMA in alcohols, a surface-reaction of TMA with coadsorbed solvent molecules (monoester formation with undecanol) has been observed. Recent investigations concerning substrate temperature during deposition and replacement of trimesic acid by the non-planar benzene-triphosphonic acid will be discussed also. Such kind of investigations may open a way to better understanding the conditions of structure formation and control which is permanently encountered in the biotic world and which might become extremely fruitful for future engineering.
Abdulhamid Chaikh
Grenoble University Hospital, France
Title: Characterization of nanodosimeter for real time measurements in radiotherapy and medical physics
Time : 14:20-14:40
Biography:
Abdulhamid Chaikh, has completed his PhD at Grenoble-Alpes University, France. He was qualified for Assistant Professor position in French University. He is working as scientist for Medical Physics & Radiation Oncology and teaching in master degree at the medical school of Grenoble-Alpes University. He has published more than 15 papers in international journals and participated to over 15 national and international conferences. He is carrying out peer reviewed articles and serving as an Editorial Board Member of the Journal of Case Reports in Oncology and Therapy. He is a member of American Association of Physicists in Medicine.
Abstract:
Purpose: The available implantable dosimeters in radiotherapy,i.e. semiconductor, MOSFET, radio luminescence of gallium nitride, etc, are imperfect and need a correction factors. In this study,we probos by simulation the size limit for a new generation of dosimeters at micro/nano scale for real time measurements in routine radiotherapy.
Materials & Methods: Monte-Carlo simulations were carried out to study the influence of nanodosimeter size on the accuracy in dose measurements using a water volume irradiated with 60Co photons. The mean specific energy (
Alexander Eberle
Ludwig Maximilian University of Munich, Germany
Title: Low cost fabrication of organic semiconductor monolayer via Organic Solid-Solid Wetting Deposition (OSWD): physico-chemical basics, controllability, process capability
Time : 14:40-14:50
Biography:
Alexander Eberle focused on the production and classification of nanoparticles during his academic studies of process engineering. His diploma thesis was about the advancement of a calcination technology to produce diesel particulate filters.After his studies he worked for 3 years in the process development of a automotive supplier that manufactures ceramic catalysts for emission control. His main fields of activity were twin-screw-extrusion and freeze-drying.Alexander Eberle started his Ph.Din 2013 in the open-research-laboratory in the Deutsches Museum in Munich.The topic of his work is thecontroled fabrication of monolayers made of organic semiconductor under ambient conditions.
Abstract:
The Organic Solid-Solid Wetting Deposition (OSWD) enables the formation of monolayers made of insoluble organic semiconductors such as Pentacene, PTCDA or Quinacridone (Chem.Eur.J. 13 (2007), 7785). It’s a surface supported process that occurs on carbon substrates (graphite, graphene, nanotubes) and inorganic substrates like MoS2 and features numerous advantages compared to other monolayer growth techniques: running under ambient conditions, no requirement of expensive equipment, suitable for commercially available organic semiconductors. The OSWD is based on the physical interaction of a dispersed semiconductor-nanocrystal and a substrate. After both got in contact, under certain conditions the nanocrystal starts to wet the substrate like a liquid would do, with a gradient of the surface-free-energy as the driving force. However, a more fundamental understanding of the OSWD is necessary in order to optimize its efficiency and to further enhance the control over the nanostructure self-assembly. We used Gamma Quinacridone as a model system, an organic semiconductor extensively used in industry as a pigment. Investigations were done via Scanning Tunneling Microscopy, particle size distribution and zeta potential (ZP) analysis. Our results reveal the influence of various dispersing agents (DA) on the ability of nanocrystals to start an OSWD and on the structure of the created monolayers. The DA gives a ZP to the nanocrystals. It’s type and intensity determines the properties and the coverage rate of the monolayer.Due to our results it’s now also possible to use water as DA. These results enable a low-cost large-scale production of semiconductor-monolayers with well-defined properties.
- 14:50-15:35: Workshop on Nanotechnology for contamination detection, remediation and water purification by Ashok Vaseashta, Claflin University, USA
- Coffee break: 15:35-15:50@Foyer