Scientific Program

Conference Series Ltd invites all the participants across the globe to attend 10th International Conference on Emerging Materials and Nanotechnology Vancouver, British Columbia, Canada.

Day 2 :

Keynote Forum

Jan J Dubowski

Université de Sherbrooke, Canada

Keynote: Digital etching of III-V semiconductors in aqueous solutions
Emerging Materials 2017 International Conference Keynote Speaker Jan J Dubowski photo
Biography:

Professor Jan J. Dubowski received his PhD degree in Semiconductor Physics from the Wroclaw University of Technology, Poland. He is a Canada Research Chair and a full professor at the Department of Electrical and Computer Engineering of the Université de Sherbrooke, Canada. He is a Fellow of SPIE – the International Society for Optics and Photonics (citation: “For Innovative methods of investigation of laser- matter interaction”). He has published over 200 research papers, reviews, book chapters and conference proceedings. He is an associate editor of the Journals of Laser Micro/Nanoengineering, Biosensors and Light: Science & Applications.

Abstract:

Etching of semiconducting materials at rates approaching atomic level resolution is of high interest to the advancement of technologies addressing fabrication of low-dimensional devices, tunability of their optoelectronic properties and precise control of device surface structure. The so- called digital etching that takes advantage of a self-limiting reaction has the potential to address some of these challenges. However, conventional applications of this approach proposed almost 30 years ago, require specialized and expensive equipment, which contributed to a relatively slow progress in penetration of digital etching to micro/nanofabrication processing schemes. We have observed that for photoluminescence (PL) emitting materials with negligible dark corrosion, it is possible to carry out PL-monitored photocorrosion in cycles analogous to those employed in digital etching. The advantage of this approach is that photocorrosion of materials, such as GaAs/AlGaAs heterostructures, could be carried in a water environment. This digital photocorrosion (DIP) process could be carried out in cycles, each approaching sub-monolayer precision. I will discuss fundamentals of DIP and, in particular, mechanisms responsible for achieving high-resolution etch rates of            semiconducting materials. For instance, we have demonstrated a successful dissolution of a 1-nm thick layer of GaAs embedded between Al0.35Ga0.65As barriers in a 28% NH4OH:H2O, and we claimed that under optimized conditions a further enhanced resolution is feasible. The nm-scale depth resolution achieved with DIP and low-cost of the instrumentation required by this process is of a potential interest to specialized diagnostics, structural analysis of multilayer nanostructures and, e.g., revealing in situ selected interfaces required for the fabrication of advanced nano-architectures.

We have explored the sensitivity of DIP to perturbations induced by electrically charged molecules, such as bacteria, immobilized on semiconductor surfaces. Here, I will highlight our recent studies on detection of Escherichia coli and Legionella pneumophila bacteria immobilized on antibody functionalized GaAs/AlGaAs biochips. I will also discuss the application of this approach for studying antibiotic reactions of bacteria growing on biofunctionalized surfaces of GaAs/AlGaAs biochips.

Keynote Forum

Hao Gong

National University of Singapore, Singapore

Keynote: Ni-based nanomaterials for high efficiency supercapacitors in energy storage
Emerging Materials 2017 International Conference Keynote Speaker Hao Gong photo
Biography:

Dr. Hao GONG is a Full Professor of Materials Science and Engineering at National University of Singapore. He is also the coordinator of the transmission electron microscopy laboratory at Department of Materials Science and Engineering. His research interests include transparent oxide conductors and semiconductors (n-type and p-type), energy storage materials and devices (mainly supercapacitors), energy harvest materials and devices (mainly solar cells), gas sensors, functional thin film and nano-materials, materials characterization (mainly on transmission electron microscopy and electron diffraction). Dr. Gong received his B.S. degree in Physics at Yunnan University in 1982. He passed his M.S. courses in Yunnan University, carried out his M.S. thesis research work at Glasgow University, UK, and received M.S. degree of Electron and Ion Physics at Yunnan University in 1987. He then did his PhD at Materials Laboratory at Delft University of Technology, the Netherlands, and obtained PhD degree there in 1992. He joined National University of Singapore in 1992, and is currently full professor at Department of Materials Science and Engineering. He has published about 200 refereed papers in major international journals.

Abstract:

Nanomaterials have special properties, and have important applications in energy storage and many other devices. For energy storage, supercapacitors have attracted great interest and development. Supercapacitor have found a lot of applications in electric cars and other equipment. Different materials have been proposed and used for supercapacitors. In this presentation, high performance supercapacitors based on nanoscale Ni-based materials, which show very high specific capacitance and energy density, are focused. The energy storage performance of such materials and devices are examined and the very high energy storage ability is discussed.  Energy storage performance, microstructure, morphology and surface area are found strongly related to Ni and Co oxide structures and morphologies, and the incorporation of some other active materials also enhance performance. 3D core-shell structures contributing to energy storage is presented and discussed.  Charged small full supercapacitors prototype will be shown to light up bulb and turn fans for a long time in this presentation.

  • Workshop
Speaker
Biography:

Dr Youssef Belmabkhout has a PhD in applied Science from the University of Mons in Belgium. He hold also a chemical engineering degree (oil and gas technologies) from the “Gubkine” Russian State University of oil and gas in Moscow (Russia). Prior to his appointment as a research scientist at the King Abdullah university of Science and technology (KAUST, KSA) in Prof Eddaoudi group, Dr Youssef Belmabkhout spent few months in ICPET-NRC (Ottawa, Canada) in 2010 working on Solid Oxide Fuel Cell. He occupied a research associate position in the department of chemistry at the university of Ottawa (Canada) with Prof Sayari from 2007 to 2010 and one and half year in the prestigious French Institute of Petroleum (IFP) in Lyon, France from 2006 to 2007. During his short research career, Dr Youssef Belmabkhout explored the use of several classes of materials for applications related to energy efficiency and environmental sustainability.
 

Abstract:

The Molecular Building Block (MBB) approach is a powerful strategy that permits the fabrication of tailored MOF materials for specific applications. The key factors for development of advanced new materials is the deep understanding of their structural-chemical properties in relationship with their properties in real applications.

 In my talk I will illustrate the power of MBB in the development of tunable platforms with a variety of interesting properties. The perfect structural control at the molecular level of these particular platforms led to the discovery of advanced materials with potential for many gas/vapor separations such as gas storage, H2S removal, paraffin-branched paraffin separation and air conditioning. In particular, I will discuss the structural properties of separation agents, from the family of MOFs with relation to the CO2 capture capabilities from ppm level to high concentrations. These properties have direct and/or indirect relation with other attributes such as type of pore (channels, cavities or combination of both), pore size, and energetics…etc. One of the crucial parameter, is the uniformity of suitable adsorption sites over a wide range of CO2 adsorption loading. Uniform and enough strong CO2 interaction (adsorption energy level) distribution is one of the strict requirements to ensure maintaining high selectivity over a broad range of CO2 adsorption loading. This uniform high charge density in addition to narrow pore size (close to CO2 molecular size) led to unveil, for the first time, a model of MOF adsorbent with a combined mechanism involving optimal thermodynamics (energetics) and kinetics for CO2 capture at intermediate, low5 and traces6 CO2 concentration. This unique combination of high and uniform charge density and optimal pore size allowed to push the boundaries of CO2 energetics to the upper limit of physical reversible adsorption (45-60 kJ/mol) combined with highly favorable CO2 adsorption kinetics.

 

  • Session I
    Track 2: Materials and Devices
    Track 4: Nanotechnology & Emerging Technologies

Session Introduction

Anton Liopo

The University of Texas MD Anderson Cancer Center, USA

Title: Gold-based emerging nanomaterials for imaging and experimental cancer therapy
Speaker
Biography:

Anton Liopo earned his PhD degree from the Institute of Physiology the National Academy of Science (NAS) of Belarus. He later went on to join the Institute of Biochemistry of NAS of Belarus as Senior Scientist, Associate Professor, and eventually the Director of Government Program. After moving to the United States, Dr. Liopo obtained trainings in molecular biology in Department Internal Medicine and nanotechnology in Center for Biomedical Engineering at the University of Texas, Medical Branch at Galveston.  He was invited and many years worked in TomoWave Laboratories Inc., where he was Lead Scientist for nanobiotechnology program.  Now Dr. Liopo continues his investigations in Center for Radiation Oncology Research, UT MD Anderson Cancer Center, where he is aiming on novel nanocomposites for enhancement of cancer radio-therapy and he is also a visiting scientist in Department of Chemistry of Rice University. Dr. Liopo is a regular reviewer and member of several editorial boards of scientific journals. Dr. Liopo has more than 75 peer-reviewed publications, including monograph, book chapters and patents. 

Abstract:

Gold nanoparticles of different shape and size have been designed and applied as contrast-enhancing agents for various imaging techniques: optical coherence tomography, fluorescence imaging, optical microscopy, photoacoustic imaging and sensing; and recently, for experimental cancer therapy as enhancers of thermal and radiation modes. In the current presentation, we are focusing on different sides of gold nanorods (GNRs) applications, as well as their synthesis, functionalization, and specific targeting. The role of GNRs in comprehensive cancer diagnostics and treatment was analyzed. We have created the novel GNRs’ modifications of wide-ranging aspects ratio and size with high yield and quality. The GNRs were assessed by their toxicity for altered categories, such as amount of gold, surface area, optical density of their solutions and number of particles.  GNRs have been reviewed as contrast agents with near-infrared absorption as highly efficient transformers of light energy into heat. Here we present the use of GNRs as plasmonic nanoparticles for selective photothermal therapy of human acute and chronicle leukemia cells using a near-infrared laser. We have investigated GNRs as potential enhancers of radiotherapy. We have demonstrated high impact of external surface chemistry, role of molecules size and thickness of surfactant layer for damage of cancer cells by electromagnetic radiation. GNRs were evaluated as theranostic agents for imaging, photothermal and radiation modalities. The results may impact pre-clinical GNRs’ applications, molecular imaging, and quantitative sensing of biological analytes.  

Ken Bosnick

National Research Council Canada, Canada

Title: Nanocarbon composites for mechanical and barrier applications
Speaker
Biography:

Dr. Ken Bosnick is a Research Officer with the National Research Council (NRC) at the National Institute for Nanotechnology (NINT) in Edmonton, Canada. He is currently leading or contributing to a number of projects involving nanocomposites. He is leading a large cross-NRC collaborative project through NINT aimed at producing high-performing barrier films, such as for food packaging and anti-corrosion coating applications, by processing graphenic and cellulosic nanomaterials with polymers. He is also leading a smaller project at NINT concerned with producing smart materials capable of sensing meat spoilage. For the Security Materials Technology Program, he is developing new carbon nanotube / ceramic hybrids for processing into ceramic composites for armour applications, including conformal metallic catalyst deposition by atomic layer and chemical vapor techniques.

Abstract:

Nanoscale allotropes of carbon, including carbon nanotubes (CNTs) and graphene nanoplatelets (GNPs), show a great deal of promise as functional fillers in nanocomposite materials. The extreme linear aspect ratios, strong sp2 carbon bonds, and high chemical stability all contribute to making CNTs ideal reinforcement fillers for mechanical applications. Conversely, the high aspect ratio planar nature of graphene and GNPs, along with their high impermeabilities, suggest applications as barrier materials. In this talk, we discuss our work on CNT – aluminum oxide (AO) composites for mechanical applications, including as ballistic armour, and GNP – polymer composites for high barrier applications, including oxygen barriers for food packaging and anti-corrosion coatings. CNT – AO hybrid structures are produced by depositing CNTs as conformal coatings on various AO materials, including powders and fabrics (see Figure 1(a)). The deposition is carried out in a large-volume chemical vapor deposition reactor, following a conformal catalyst deposition from solution or via an atomic layer deposition process. The CNT – AO hybrids are sintered into composite materials under high pressure and characterized for mechanical enhancements. Increases in fracture toughness of as high as 71% have been found from these CNT – AO composites. GNP materials are melt-processed with polyethylene (PE) and extruded into packaging films (see Figure 1(b)), which are characterized for their oxygen transmission rates. It is found that the GNP – PE films show comparable oxygen transmission rates to the neat PE films, indicating that further processing will be necessary to realize the desired enhancements. The GNP materials are also solution processed with epoxy (EP), cast onto steel substrates, and cured to form coatings. The efficacy of these coatings as anti-corrosion barriers is established by electrochemical and salt-fog corrosion tests. Early results suggest that the GNPs are enhancing the anti-corrosion performance of the EP films.

Speaker
Biography:

Dr. Jingyang Wang is the distinguished professor and division head in the High-performance Ceramics Division at the Shenyang National Laboratory for Materials Science, China. He has been internaitonally recognized for his sustained contributions to innovative technology in processing bulk, low-dimensional and porous ceramics, and to fundimental understanding of multi-scale structure-property relationship of advanced structural ceramics. His works have extensively covered fundemental and technological developments of carbides, nitrides, oxynitrides, silicates, and hafnates for extreme environment applications. He has published 185 peer-reviewed SCI papers (WoS H-index factor 38), hold 18 registered patents, and has delivered more than 50 keynote/invited lectures. Dr. Wang was the recipient of Acta Materialia Silver Medal (2016) and National Leading Talent of Young and Middle-aged Scientists (China, 2015), and served as the Chair-elect (2016) of Engineering Ceramic Division of The American Ceramic Society (ACerS) and the program chair of 41st ICACC hosted by ACerS in Florida. 

Abstract:

The critical challenge of current nanoscale oxide super thermal insulation materials, such as SiO2 and Al2O3 nano-particle aggregates and their composites, is the critical trade-off between extremely low thermal conductivity and unsatisfied thermal stability (nanostability typically below 1100oC). It is crucial important to modify current materials and further discover novel candidates which could balance the two key properties. This presentation shows progresses on optimal thermal stability of modified Al2O3 nano-paticle aggregate; and in addition, new candidates of super thermal insulation materials, such as nano-Si3N4 and nano-SiC, which are commonly believed as excellent heat conductors. Especially, the new nano-systems exhibited good nanostability up to 1500°C. The striking results incorporated superior sintering stability of structural ceramics as SiC and Si3N4 with multiple phonon scattering mechanisms in nano-materials. It is possible to put forward this novel concept to design and search new types of high temperature thermal insulation materials through nano-scale morphology engineering of structural ceramics with excellent thermal stability, regardless their high intrinsic lattice thermal conductivities. 

Speaker
Biography:

Lin Jiang received her B.Sc. and Ph.D. degree in chemistry from Jilin University, Jilin, China, in 2000 and 2005, respectively. She was awarded the Alexander von Humboldt Research Fellowship in 2006 and worked at Physical Institute of Muenster University in Germany from 2006 to 2009. Then she became a senior research fellow in 2009 at the school of materials science and engineering in Nanyang Technological University, Singapore. Currently, she is a professor at Institute of Functional Nano & Soft Materials (FUNSOM), Soochow University, China since 2012. Mainly focused on the self-assembly of novel nano-structured materials, and optoelectronic complex devices. She has Published over 50 SCI papers in high quality journals, such as Acc. Chem. Res., Adv. Mater., Energy enviyon. Sci., ACSNano, Adv. Funct. Mater., etc. 

Abstract:

Plasmonics confine the light into nanoscale dimensions much beyond the diffraction limit by coupling the light with the surface collective oscillation of free electrons at the interface of the metal structure and the dielectric. The resonant collective oscillations give rise to an enhanced electron-magnetic field correlate with high density optical states.It modifies the light-matter interaction which results in enhanced absorption, emission or energy transfer. Hence, this photo-response mechanism makes the plasmonic structures to be an attractive study candidate to enhance the function of the optoelectronic devices, such as photodetector, solar cell, and light emitting diodes (LEDs). So far, it is still desirable to develop more unique plasmonic structures and explore their plasmon effects on devices performance to develop new-generated optoelectronic devices. Herein we introduced the research results of plasmon enhanced optoelectronic devices (photo detector, organic light emitting diode, sensors, etc.) by incorporation with different plasmonic nanostructures (zero-dimension,  one-dimension or two-dimensional multiplexed plasmopnic nanostructures) and revealed the involved effective photon-management enhancement mechanism. The remarkable performance enhancement of the devices will guide the potential applications of plasmonic structures in next high-speed and high-density integrated optoelectronics and other plasmon assisted advanced devices. 

Speaker
Biography:

Shao-Chin Tseng has completed his PhD from department of materials science and engineering, National Taiwan University. He is the assistant scientist of National Synchrotron Radiation Research Center. He studies on Nanotechnology, X-ray nanoprobe, Optoelectronic Materials, Semiconductor Process, Biomedical Sensing.  He has published more than 25 papers in reputed journals.  

Abstract:

The X-ray nanoprobe (XNP) will open to all professors and researches since 2017. The XNP provides versatile X-ray-based inspection technologies, including diffraction, absorption spectroscopy, imageology, and so on. Also it will improve the analysis scale of imhomogeneous materials, tiny and diluted samples to the nanoscale. Moreover, the high- transmitted XNP can be used to inspect the “Nano World” like atomic arrangements, chemical and electronic configurations, which are widely adopted in the physics, chemistry, materials science, semiconductor devices, nanotechnologies, energy and environmental science, and earth science. Beside to the opening to the researchers, it is also important to improve the inspection and research strength of the XNP in the nanomaterials field, in order to increase the academic influence of the XNP and the Taiwan Photon Source. The primary experimental technique of XNP includes X-ray fluorescence spectroscopy (for the analysis in the depth-of-field distribution of elements), extended X-ray absorption spectroscopy (for the analysis in the electronic configuration and the atomic or molecular bonding length), excitation X-ray fluorescence spectroscopy (for the analysis in the recombination and transport of carriers), in-phase scanning X-ray imageology (the Fourier phase transform calculation can improve the space resolution down to 3nm to 5nm, and detect the stress distribution inside the nanostructures). The design XNP and the experimental applications will be reported.

Speaker
Biography:

Ganesh Kumar Mani is a researcher at Micro/Nano Technology Center, Tokai University, Japan. He completed his Ph.D. in Nano Sensors Lab @ Centre for Nanotechnology & Advanced Biomaterials (CeNTAB), SASTRA University, Thanjavur, India. He published over 40 research papers in reputed international journals with the cumulative impact factor over 70 with a few papers under review. He is also one of the inventors in two patents titled “Low Concentration Ammonia Vapour Sensor” & “Acetaldehyde Sensor Using ZnO Nanoplatelets”. He has also delivered several keynote lectures, organized national and international conferences in various countries. His current research interests are fabrication and development of nanostructured (Nanospheres, Nanorods, Nanowires, Nanoplatelets, Nanosheets) thin film based gas/chemical sensors for predicting food quality, developing microfluidics based solid state pH/temperature/bio-sensors for biomedical applications and developing painless microneedles for healthcare applications, etc.

Abstract:

Acid–base homeostasis and pH regulation inside the body is precisely controlled by kidney, lungs and buffer systems, because even a minor change from the normal value could severely affect many organs. Blood and Urine pH tests are common in day-to-day clinical trials without out much effort. Still, there is great demand for in vivo pH testing to understand more about body metabolism and to provide effective treatments during diagnosis. The detection of pH at the single-cell level is hoping for the great level of clinical importance for the early detection of many diseases like cancer, diabetes, etc. In this research work, we have fabricated a micro region pH sensors by series of processes like electrolytic polishing to create needle structure, deposition of electrode materials using RF magnetron sputtering for pH measurements and finally testing in various biological mediums. Working and reference electrodes were Ag/AgIO3 and Sb/Sb2O3 deposited on microneedles under optimized deposition parameters. The structural, elemental and morphological properties were analyzed using XRD, XPS, EDS and FE-SEM. The fabricated tip of the microneedle probe is around 5µm analyzed by FE-SEM which size is comparable with the biological cells. pH testing was initially begin with using fish egg and various biological cells. The obtained pH sensing results were adequate with theoretical values. Since the sensor works at micro region, the potential difference is easily disturbed by atmospheric anomalies. Hence, many steps have been taken to improve the stability of the sensor. Besides that, fabricated microneedle sensor ability is proved through in vivo testing in mice cerebrospinal fluid (CSF) and bladder. The pH sensor reported here is totally reversible and results were reproducible after several routine testing.

Speaker
Biography:

Walid Tawfik, is Egyptian associate Professor, in laser spectroscopy and ultrafast lasers at the National Institute of Laser (NILES), Cairo University, Cairo, Egypt. In 1994 he joined NILES as staff member and promoted as assistant lecturer, assistant professor and associate Professor in 1996, 2000, and 2008, respectively.  He received the B.SC, Master and Ph.D degrees in physics, laser physics, and laser spectroscopy in 1992, 1996, 2000, respectively, from Cairo University, Egypt. His interested in the field  of ultrafast lasers and ultrafast phenomenon. He has built Fewcycle ultrafast system of 5-fs pulse duration and 0.6 mJ at 1 kHz and published 46 papers. He is a senior member of different international professional societies like IEEE, OSA, APS, and SPIE. He have collaborated with different international groups in USA, Japan, South Korea and Germany.

Abstract:

Quantum dots (QDs) represent semiconductor 3D nano crystals with electronic and optical characteristics controlled by their morphology, size and coating. Typically created semiconductor group II–VI materials such as Titanium oxide TiO3, Cadmium selenide (CdSe), Cadmium telluride (CdTe), Cadmium Sulphide CdS … etc. QDs have numerous applications such as Solar Cells , medicine and, and fabrication of LEDs. The fluorescence of the QD optical can be altered by the strong quantum confinement ranges from few to 10 nm nano crystals which allow for tuning of the fluorescence emission bands. Nevertheless, the QD efficiency affected by many parameters such as; type and quantity of impurities in QDs which will fluctuate the electronic traps, especially the dangling bonds, in the interface between the core and the coating of the QDs.
 
In this work, the fundamental wavelength of Nd:YAG laser at repetition rate 10 Hz to analysis the impurities in the QDs using laser induced plasma spectroscopy LIPS. The plasma parameters were controlled to adapt the local thermodynamic equilibrium conditions (LTE) for optically thin plasma. The observed results gave a qualitative LIPS analysis investigation for the available impurities in the semiconductor QDs. The obtained results gave a precise detail of the semiconductor sample compositions including the types of these impurities. Consequently, these results can be applied in prospective work in which to control the impurities contents in such QDs samples which could be used to control the electrical, optical and physical properties of the semiconductor QDs in future

Speaker
Biography:

Abstract:

A class of bacterium, S. pasteurii can mediate the precipitation of calcium carbonate crystals under the right chemical environment. These crystals can actually enter a network of pores in a porous medium and cause clogging. As a result, the structure may gain significantly in strength and exhibit superior mechanical properties. This is characterized by reduction in porosity, physical pore blockage and increase in elastic moduli. This concept may be extended to a wide array of applications like underground carbon storage and repairing fractures in fragile structures. In the present study, open foam sponges of two different grades were used as porous media mimics. We performed comprehensive material testing on samples before and after bacteria treatment and drew quantitative conclusions. We tested the samples under compressive and impact loads and characterized the modification in mechanical behavior due to pore clogging. Visual observation of the actual blockage process at the pore scale was performed using Scanning Electron Microscopy (SEM) and micro-CT scans. We noticed a significant change in mechanical properties. To conclude, this particular bacterium may be used as an agent to cause pore-clogging at the microscale and the idea applied to a range of applications.

  • Session II
    Track 6: Biomaterials and Bioinspired Materials
    Track 8: Emerging Materials for Energy Storage
    Track 9: Metals and Mining

Session Introduction

Samuel Frimpong

Missouri University of Science and Technology, USA

Title: Tire rubber material characterization for effective structural and fatigue modeling and analysis
Speaker
Biography:

Frimpong is Professor and Robert H. Quenon Endowed Chair at Missouri S&T. He holds PhD (1992) from Univ. of Alberta, MS (1988) from Univ. of Zambia, and Post-Graduate Diploma (1986) and BS (1985) from KN Univ. of Science and Tech. of Ghana. His research areas include machine dynamics, machine and whole-body vibrations, fatigue modeling, augmented visualization, formation excavation, intelligent mining systems, and mine safety, health and hazards engineering. He has and continues to lead research initiatives in these areas with over $34 million funding. His research results include over 30 PhD and MS graduates, 1 book, 3 book chapters, over 200 refereed journal and conference papers and over 200 presentations. Frimpong has been recognized with Missouri S&T Chancellor’s Leadership Award, Robert Quenon Endowed Chair, Canadian Petroleum Institute’s Distinguished Lecturer Award, Award of Distinction by World Mining Congress, University of Alberta/CIDA PhD Scholar, Life Patron of UMaT Alumni Association, Grand Award by NW Mining Association and a UNESCO Research Fellowship. He is a member of the APLU Board on Natural Resources, Vice Chair of the Minerals and Energy Resources Division of NASULGC, and a member of the College of Reviewers for Canada Foundation for Innovation and Canada Research Chairs Program and ASCE-UNESCO Scientific Committee on Emerging Energy Technologies (ASCE-UNESCO SCEET). He served 5 years as a member of CDC-NIOSH Research Advisory Board, 4 years as co-chair of ASCE-UNESCO SCEET and 2 years on Japan’s Global Warming Research Consortium. He is currently the Editor-In-Chief of the Journal of Powder Metallurgy and Mining and Editorial Board Member for the International Journal of Mining, Reclamation and Environment. He is a Registered Professional Engineer and a member of the Canadian Institute of Mining, Metallurgy and Petroleum, American Society for Mining, Metallurgy and Exploration, American Society of Civil Engineers, and the Society for Modeling and Simulation International.

Abstract:

Rubber, in its natural state, has the consistency of a heavy viscous fluid with little to no use in structural applications. However, when vulcanized with sulfur, particulate fillers, silica and other strength inducing ingredients, cross-links are formed and the highly amorphous state of the rubber is transformed into an elastic solid. Thus, vulcanized rubber, in the absence of cords, is a nanocomposite. While added fillers give rubber enhanced performance characteristics (stiffness and toughness properties), their presence influence the dynamic and damping behavior of rubber in a very complex and disproportionate fashion. Numerical modeling of rubber behavior for predictive analysis remains a formidable challenge amidst successes achieved thus far. The object of this paper is to implement existing rubber material constitutive models in characterizing tensile strength and fatigue test data of rubber specimens extracted from an off-road mining truck tire. Specifically, the paper highlights modeling strategies for rubber strain softening, nonlinear viscoelasticity, strain-induced crystallization, and fatigue crack growth rate using spreadsheets, and commercially available material calibration codes. The novelty of the study lies in the calibration approach adopted for the fatigue characterization of the experimental data. An example problem to show how the characterized materials are used in a finite element analysis of a model tire is provided. The results obtained indicate enhanced durability in strain-crystallizing elastomers

Speaker
Biography:

Dr. Aman Ullah received his PhD (with distinction) in Chemical Sciences and Technologies in 2010 at the University of Genova, Italy by working together at Southern Methodist University, USA. He is currently working as an Assistant Professor at the Department of Agricultural, Food and Nutritional Science, University of Alberta. He has published more than 25 papers in reputed journals and 3 patents/patent applications. Aman was named a Canadian Rising Star in Global Health by Grand Challenges Canada.  

Abstract:

Solvent free conversion of canola oil and fatty acid methyl esters (FAME's) derived from canola oil and waste cooking oil under microwave irradiation demonstrated dramatically enhanced rates. The microwave-assisted reactions lead to the most valuable terminal olefins with enhanced yields, purities and dramatic shortening of reaction times. Various monomers/chemicals were prepared in high yield in very short time. The complete conversions were observed at temperatures as low as 50 ºC within less than five minutes. The products were characterized by GC-MS, GC-FID and NMR. The prepared monomers were further converted into biopolymer and characterized in detail. In another approach, amphiphilic ABA type PEG-Lipid conjugated macromolecules have been synthesized using the copper-catalyzed azide-alkyne cycloaddition commonly termed as “click chemistry. Characterization of the conjugates has been carried out with the help of 1H-NMR, FTIR and GPC. The conjugates were evaluated for the encapsulation and release of an anticonvulsant drug (carbamazepine) as a hydrophobic drug model in the study. The micellization, drug encapsulation and release behavior of macromolecules was investigated by dynamic light scattering (DLS), transmission electron microscope (TEM) and fluorescence spectroscopy. From the results, it has been concluded that the nanoparticles had different average sizes due to different ratio of hydrophilic contents in the conjugate backbone. The Amphiphilic particle size and structure could be altered by changing the ratio of hydrophilic and hydrophobic contents. The in vitro drug encapsulations highlighted that all the drug-loaded micelles had spherical or near-spherical morphology. In vitro drug release study showed the controlled release of hydrophobic drug over a period of 50 hours. The results indicate that there is great potential of renewable lipid-based micelle nanoparticles to be used as hydrophobic drug carriers.

Samuel Frimpong

Missouri University of Science and Technology, USA

Title: DEM modeling of oil sands materials structures
Speaker
Biography:

Frimpong is Professor and Robert H. Quenon Endowed Chair at Missouri S&T. He holds PhD (1992) from Univ. of Alberta, MS (1988) from Univ. of Zambia, and Post-Graduate Diploma (1986) and BS (1985) from KN Univ. of Science and Tech. of Ghana. His research areas include machine dynamics, machine and whole-body vibrations, fatigue modeling, augmented visualization, formation excavation, intelligent mining systems, and mine safety, health and hazards engineering. He has and continues to lead research initiatives in these areas with over $34 million funding. His research results include over 30 PhD and MS graduates, 1 book, 3 book chapters, over 200 refereed journal and conference papers and over 200 presentations. Frimpong has been recognized with Missouri S&T Chancellor’s Leadership Award, Robert Quenon Endowed Chair, Canadian Petroleum Institute’s Distinguished Lecturer Award, Award of Distinction by World Mining Congress, University of Alberta/CIDA PhD Scholar, Life Patron of UMaT Alumni Association, Grand Award by NW Mining Association and a UNESCO Research Fellowship. He is a member of the APLU Board on Natural Resources, Vice Chair of the Minerals and Energy Resources Division of NASULGC, and a member of the College of Reviewers for Canada Foundation for Innovation and Canada Research Chairs Program and ASCE-UNESCO Scientific Committee on Emerging Energy Technologies (ASCE-UNESCO SCEET). He served 5 years as a member of CDC-NIOSH Research Advisory Board, 4 years as co-chair of ASCE-UNESCO SCEET and 2 years on Japan’s Global Warming Research Consortium. He is currently the Editor-In-Chief of the Journal of Powder Metallurgy and Mining and Editorial Board Member for the International Journal of Mining, Reclamation and Environment. He is a Registered Professional Engineer and a member of the Canadian Institute of Mining, Metallurgy and Petroleum, American Society for Mining, Metallurgy and Exploration, American Society of Civil Engineers, and the Society for Modeling and Simulation International.

Abstract:

Oil sands are composite materials whose two dominant physical characteristics are the quartzose mineralogy and the large quantities of interstitial bitumen. The void spaces are also filled with a thin continuous net of water around the quartz grains with the remaining space occupied by dissolved gasses. An examination of thin sections and electron scanning micrographs reveals a typical particulate system whose mechanical behavior can be modeled based on particle interactions (contacts) at the microscale. The oil sands formation exhibits mainly a dense, interpenetrative, uncemented structure with a large number of contacts per grain. Additionally, oil sand undergoes high dilation under low normal stresses. In this paper, the microstructural and micromechanical behavior of oil sands materials is studied and an appropriate and comprehensive contact model is identified to describe its  nonlinear, anisotropic and time-dependent behavior. A 2-D discrete element method (DEM) is developed to model the oil sands structures using DEM software package, Particle Flow Code (PFC2D). The time-dependent behavior of the bitumen (consisting of bonded fine particles) is represented by a Burger’s model. The quartz grains are modeled with irregular (subrounded and subangular) shape clumps (a rigid collection of disc bonded together). The thin-film of water surrounding the quartz grains is represented as a liquid bridge to determine the capillary force at the interface. The micromechanical model of the oil sand was developed with three different constitutive laws (force-displacement contact models) to represent the contact interactions of the constituents at the microscale. The paper provides theoretical foundations for understanding machine-ground interactions during excavation and for material behavior predictions. Understanding the microscopic behavior of oil sands materials would enhance long-term equipment design improvements and provide production engineers with higher equipment longevity and reliability for mine production and maintenance planning purpose.

Speaker
Biography:

Zhihao Yue has his expertise in using nano-silicon structures to improve the efficiency of silicon solar cell and the electrochemical properties of silicon anode materials in Lithium ion batteries. He used cheaper metal nickel (compared with silver) as assisted metal to fabricate nanostructures on silicon surface and investigated its etching mechanism deeply, which is the first study about nickel-assisted chemical etching method for black silicon solar cells. Besides, he systematacially studied the effect of intrinsic electrical resistivity of silicon materials on its performance in lithium ion batteries for the first time and found that silicon materials with lower electrical resistivity present better charge-discharge properties.

Abstract:

We have done much work about silicon (Si) in solar cells and lithium ion batteries (LIBs). In the aspect of solar cell, we used silver (Ag) -assisted chemical etching method to fabricate black silicon solar cells with efficiency over 18% in 2013 and large-scale production was carried out. Besides, nickel, which is cheaper than Ag, was used as assisted metal to fabricate black silicon structure for the first time and surface reflectance of 1.59% was obtained. In the aspect of LIBs, we used Si powders made from broken Si wafers with different electrical resistivity in semiconductor industry as anode material in LIBs. We found that Si powders made from Si wafers with lower electrical resistivity show better electrochemical performance (higher capacity, and better rate performance) in LIBs. Therefore, broken Si wafers in semiconductor industry should be classified according to their electrical resistivity, which can be convenient for being used as anode raw materials for LIBs.