DATE: Sunday, April 22, 2018
TIME: 12:00 PM - 01:00 PM
LOCATION:Auditorium Between Builidng 4 & 5
Abstract: Iron and Co complex with covalently attached proton transfer motifs are tuned to reduce CO2 to CO as well as formic acid selectively under different experimental conditions. The selectivity is governed by relative binding affinity of the reduced Fe center towards CO2 and H+ which in turn can be tuned by utilizing the distal functional groups. Resonance Raman spectroscopy, FTIR and electrochemical techniques are used to elucidate the reaction mechanism. The role of different intermediates in governing the selectivity will be illustrated. The tailor made complexes are demonstrated to be among the most selective and efficient electrocatalysts to be developed till date.
Biography: Abhishek Dey has a background in electronic structure and synthetic inorganic chemistry. His research aims at emulating the reactivity of enzyme active sites in synthetic analogues using the geometric and electronic structure function relationships present in natural systems. His current area of interest includes multi-proton and multi-electron transformations that are key for clean energy and environment and development of new analytical techniques to spectroscopically investigate heterogeneous electrocatalysts.
DATE: Monday, April 23, 2018
LOCATION:The auditorium between build 4 and 5
DATE: Tuesday, April 24, 2018
TIME: 09:30 AM - 11:00 AM
LOCATION:Building 9, Level 2, Lecture Room 2322
Abstract: Semi-crystalline polymers having amorphous and crystalline regions usually have intimately mixed chains. The mixing of chains in the two regions becomes pronounced with molar mass, retrospectively enhancing topological constraints (entanglements) in the amorphous region. On melting of the crystalline regions, entanglements get homogeneously distributed. Because of the increase in number of entanglements per chain, conventional processing of polymers having molar mass greater than a million g/mol becomes nearly impossible. Therefore processing of a polymer such as Ultra High Molecular Weight Polyethylene (UHMW-PE) requires more than 90wt% of toxic solvent to make strongest man-made fibers used for demanding applications such as body armors or light weight cables and ropes. Making use of advances in polymer chemistry it has been possible for us to control entanglements to an extent that UHMW-PE can be processed in solid-state avoiding usage of toxic solvent. The route opens the possibility of making the strongest man-made tapes and films having unprecedented mechanical properties and thermal conductivity in an insulator. Thus opening new possibilities for light weight composites required for body and armor protection, battery separators for Lithium ion batteries, membranes for water filtration and advanced solutions for hip- and knee- prostheses. The controlled synthesis also provides fundamental insight in our understanding on the equilibration process of non-equilibrium polymer melt, while invoking kinetics in melting.
Biography: Dr Sanjay Rastogi holds Chair in Polymer Physics at Maastricht University, The Netherlands. He provides leadership to a group of assistant professors and a team of PhD students and post-doctoral research fellows. His research focuses on a basic understanding to design molecular structure for desired physical properties, and to develop optimal processing techniques in order to develop products with the required macroscopic properties. To accomplish this goal, he with his group adopts chain-of-knowledge approach combining chemistry, physics and rheological aspects of polymer science. He frequently collaborates with researchers within and outside the Netherlands. Beside his research obligations he is involved in teaching and management activities.From 2006 till 2016 he held chair of polymer science and technology at the University of Loughborough, UK. At present he is honorary visiting professor at Loughborough University.
From 2007 till 2016, he was principal scientist at Teijin Aramid, Arnhem (NL) also and was seconded from the University of Loughborough. In the company, he was instrumental in the startup of the new business commercialized under the brand name Endumax®. Within the company he also chaired innovation programs and steered teams for bringing fundamental concepts to commercial realization. From 1993 till 2006 he was assistant and associate professor in the Chemical Engineering department of Eindhoven University of Technology, The Netherlands. Prior to joining Eindhoven University he did his studies at Bristol University, UK.He has been recipient of Max-Planck Society fellowship that allowed him to spend his two years of sabbatical at Max-Planck Institute for Polymer Science, Mainz. He has been recipient of outstanding scientist position for five years from Council of Science and Industrial Research (CSIR), India.
He has published more than 140 research papers in peer reviewed journals and supervised 25 PhD students. He is co-inventor of nearly 30 patent and patent applications. To bridge innovation to business he has studied Executive MBA at the Rotterdam School of Management (NL). In the two year program, 2014-2016, he has followed international business courses at Cape Town University (South Africa), Georgetown University (USA), and Warwick University (UK). The study was sponsored by Teijin Aramid, The Netherlands.
TIME: 11:00 AM - 12:30 PM
LOCATION:Building 9, Room 2322
It is now fifty years since the first commercial reverse osmosis plants were installed. Prior to that membranes had only been used in a few laboratory applications. The total membrane market was then about 20 million dollars per year in today’s dollars. The current membrane industry is in the range of 10 billion dollars per year, and still growing. Membranes are now used to separate drinking water from the sea, nitrogen from air, contaminants from natural gas, and bacteria from municipal water and to separate the protein components of blood. A series of new Unit Operations have been created. In this talk I will describe the development of this industry from early research conducted in the 1950’s to the million square meter membrane plants being installed to day. I will end with a hint of what the future may bring.
Richard Baker received his doctorate in physical chemistry in 1966 at Imperial College, London, where he studied under Professor R. M. Barrer, one of the pioneers of membrane science. Subsequently, he joined Amicon Corporation, Lexington, MA, and developed a series of ultrafiltration membranes now sold under the name Diaflow®. Later at the Alza Corporation, Palo Alto, CA from 1971 to 1974, he collaborated in the development of the Ocusert® ocular delivery system. In 1974, he co-founded Bend Research, Inc., Bend, OR, where he was the Director of Research until 1981.
In 1982, Dr. Baker left Bend Research and founded his second company, Membrane Technology and Research, Inc. (MTR), where he served as president for twenty-five years. MTR has become a leading membrane research, development, engineering, and production company, concentrating on the development of membranes and membrane systems for industrially significant gas separation applications. The company's principal membrane products are VaporSep® membrane systems to remove organic vapors from air and nitrogen. More than 100 commercial units have been installed worldwide in chemical and petrochemical plants. MTR has also developed other gas separation technologies for applications in the natural gas processing and petroleum refining industries. In 2007, Dr. Baker stepped aside as MTR's president, but remains a member of the Board of Directors, and is leading a new development program for MTR's membrane-based biomass/biofuel ethanol separations technology.
He is a founder and past president (1981-82) of the International Controlled Release Society and also helped found the North American Membrane Society (NAMS), serving on the NAMS governing board from 1986 to 1989. His work in membrane science has been recognized by several awards. He received the Controlled Release Society's Founders' Award in 1985. In 1997, he received the Chemical Engineering Magazine Kirkpatrick award for monomer recovery in polyolefin plants. In 2002, Dr. Baker received the first Alan S. Michaels Award for Innovation in Membrane Science and Technology, presented by the North American Membrane Society.
Dr. Baker is the author of more than 100 papers and over 130 patents, all in the membrane area. His book, Controlled Release of Biologically Active Agents was published in 1987, and three editions of his book Membrane Technology and Applications were published in 2000, 2004 and 2012.
TIME: 02:00 PM - 03:00 PM
LOCATION:BW BUILDING 2 AND 3- AUDITORIUM Rm- 0215
Having accurate images of Earth's interior is crucial to improve our understanding of the inner dynamics of our planet. Recent advances in numerical methods combined with developments in high-performance computing have enabled unprecedented simulations of seismic wave propagation in realistic 3D Earth models. Global adjoint tomography is one of the extreme projects in seismology due to the intense computational requirements and vast amount of data that can potentially be assimilated in inversions. The first-generation global adjoint tomography model, GLAD-M15, was constructed using data from 253 earthquakes with transverse isotropy confined to the upper mantle. The 15th iteration model features enhancements of well-known slabs such as the Hellenic and Japan Arcs, as well as subduction along the East of Scotia Plate, which does not exist in the starting model; a tantalizingly enhanced image of the Samoa/Tahiti plume, as well as various other plumes and hotspots, such as Caroline, Galapagos, Yellowstone, and Erebus. The results suggest that we are approaching the resolution of continental-scale studies in densely covered regions despite using a limited data set. While gradually increasing the database in a complementary inversion, we are currently demonstrating different measurement techniques and parameterisations using the smaller dataset that was used in the construction of GLAD-M15 and addressing, for instance, azimuthal anisotropy and 3D anelasticity of the mantle in the next-generation models.We perform our simulations using the GPU version of SPECFEM3D_GLOBE on the Oak Ridge Leadership Computing Facility's Cray XK7 Titan system, a computer with 18 688 GPU accelerators. We will perform 9 s simulations (currently 17 s) on Oak Ridge's next generation supercomputer "Summit". The ultimate aim is to go down to 1 Hz in global simulations, which will lead to whole-Earth inversions by also updating the core, and assimilate all available seismic data from all global CMT earthquakes within the magnitude range of 5.5 to 7.0 in the construction of global models.
Ebru Bozdag is an assistant professor at Colorado School of Mines since April 2017. Previously, she was an assistant professor and held a chaire d'excellence position at University of Nice Sophia Antipolis. Prior to joining Nice as a faculty member, she was a postdoctoral research associate, then an associate research scholar, at Princeton University. She received her PhD in seismology from Utrecht University and MSc/BSc degrees in geophysics from Istanbul Technical University. Her research interests are centered around computational and global seismology. Specifically, she uses 3D wave simulations to improve our understanding of Earth's interior by linking observed data to advances in theory and numerical methods in wave propagation and optimization techniques. Her main research has been dedicated to performing global-scale full-waveform inversions based on 3D wave simulations and adjoint methods.
DATE: Wednesday, April 25, 2018
TIME: 09:00 AM - 11:00 AM
LOCATION:Al Jazri Building, Bldg 4, Level 5, Room 5209
Abstract: Cellulose has emerged as an indispensable membrane material due to its abundant availability, low cost, fascinating physiochemical properties and environment benignancy. However, it is believed that the potential of this polymer is not fully explored yet due to its insolubility in the common organic solvents, encouraging the use of derivatization-regeneration method as a viable alternative to the direct dissolution in exotic or reactive solvents.
In this work, we use trimethylsilyl cellulose (TMSC), a highly soluble cellulose derivative, as a precursor for the fabrication of cellulose thin film composite membranes. TMSC is an attractive precursor to assemble thin cellulose films with good deposition behavior and film morphology; cumbersome solvents used in the one step cellulose processing are avoided. This derivative is prepared from cellulose by the known silylation reaction. The complete transformation of TMSC back into cellulose after the membrane formation is carried out by vapor-phase acid treatment, which is simple, scalable and reproducible. This process along with the initial TMSC concentration determines the membrane sieving characteristics.
Unlike the typical regenerated cellulose membranes with meso- or macropores, membranes regenerated from TMSC display micropores suitable for the selective separation of nanomolecules in aqueous and organic solvent nanofiltration. The membranes introduced in this thesis represent the first polymeric membranes ever reported for highly selective separation of similarly sized small organic molecules based on charge and size differences with outstanding fluxes. Owing to its strong hydrophilic and amorphous character, the membranes also demonstrate excellent air-dehumidification performance as compared to previously reported thin film composite membranes. Moreover, the use of TMSC enables the creation of the previously unfeasible cellulose–polydimethylsiloxane (PDMS) and cellulose–polyethyleneimine (PEI) blend membranes with a good compatibility. The cellulose–PDMS membranes demonstrate attractive performance in ethanol-water pervaporation as compared to the commercial PDMS membrane, and allow nanofiltration of a wide range of solvents with different polarity. The cellulose-PEI membranes exhibit anomalous performance improvement in nanofiltration as compared to the corresponding pure membranes. This study has opened up many great opportunities for cellulose to continuously contribute to sustainable and economical membrane processes.
TIME: 04:15 PM - 05:15 PM
LOCATION:Lecture Hall 1 (2322), Engineering and Science Hall (Building 9)
DATE: Thursday, April 26, 2018
LOCATION:Auditorium (Room 0215) between building 4 & 5
ABSTRACT: The impact of a drop on a solid surface is important in many manufacturing processes. It is often undesirable to have bubbles entrapped under the impacting drop, for example during inkjet fabrication of electronic displays. It is therefore of interest to understand the dynamics and size of the resulting bubble sitting at the solid-liquid interface. We use ultra-high-speed interferometry at up to 5 million fps to measure the air-layer profile under an impacting drop. The lubrication pressure in the air-layer deforms the bottom of the drop making the first contact occur, not at a point, but along a ring, thus entrapping an air disc. Using 200 nano-second time resolution and 1 micron space resolution, we can apply interferometry to extract the time-resolved shape evolution of this air disc. For impacts of water drops under atmospheric conditions we see excellent agreement with theoretical predictions for the disc thickness and radial extent. Here we focus on the effect of increasing the drop viscosity on the air layer. For very high viscosities we see no immediate contact with the solid and the drop glides on the air-layer, forming an extended thin film. We will also show the most recent impact studies under reduced atmospheric pressure and for impacts on liquid surface, where new instabilities are observed.BIOGRAPHY: Prof. Sigurdur Thoroddsen faculty page.
LOCATION:Building 9, Lecture Hall 2325
DATE: Wednesday, May 02, 2018
Abstract: A numerical method is designed for a phase field model for the moving contact line problem, which consists of a coupled system of the Cahn-Hilliard and Navier-Stokes equations with the generalized Navier boundary condition. In this method, the system is solved in a decoupled way. For the Cahn-Hilliard equations, a convex splitting scheme is used along with a P1-P1 finite element discretization. A linearized semi-implicit P2-P0 mixed finite element method is employed to solve the Navier-Stokes equations. With the help of this method, we study two-phase fluid flow in coupled free flow and porous media regions. The model consists of coupled Cahn-Hilliard and Navier-Stokes equations in the free fluid region and the two-phase Darcy law in the porous medium region. We propose a Robin-Robin domain decomposition method for the coupled Navier-Stokes and Darcy system with the generalized Beavers-Joseph-Saffman condition on the interface between the free flow and the porous media regions. Numerical examples are presented to illustrate the effectiveness of this method.
Bio: Dr. Chen received his Ph.D. from Nanyang Technological University in 2011. Then he worked in the department of Mathematics of Hong Kong University of Science and Technology as a postdoc. He joined Xi’an Jiaotong University in 2013 and now he is an Associate Professor in School of Mathematics and Statistics in XJTU. His research interests include numerical simulation of multi-phase multi-component fluid flow, superconvergence of finite elements, adaptive algorithm and mesh generation. His recent work focuses on simulation of multi-phase multi-component fluid flow in coupled free flow and porous media regions and related topics in the field of petroleum reservoir simulation.
DATE: Thursday, May 03, 2018
ABSTRACT: Capacitive energy storage is distinguished from other types of electrochemical energy storage by short charging times, the ability to deliver significantly more power than batteries and long cycle life. A key limitation to this technology, which is based on electrical double-layer capacitance, is its low energy density. For this reason, there is considerable interest in exploring materials which exhibit pseudocapacitive charge storage where the faradaic reactions that occur with transition metal oxides lead to energy densities which are many times larger than traditional double layer capacitance. With these materials there is the prospect of creating materials that exhibit both high energy density and high power density. However, the ability to identify the material characteristics which lead to pseudocapacitive responses is still at its inception.We have used Li+ insertion in Nb2O5 as a model system in which to understand the electrochemical and structural features associated with pseudocapacitive mechanisms. Charge storage in this system arises from redox reactions as in battery materials and yet the kinetics of charge storage are determined by surface-like kinetics rather than semi-infinite diffusion. An important feature with the Nb2O5 system is that the structure does not undergo a first-order phase transition upon Li+ insertion. Another route for creating pseudocapacitive solids is through the synthesis of nanoscale redox materials. At nanoscale dimensions, electrochemical characteristics become more capacitor-like because of a larger number of surface sites for charge storage and/or suppression of phase transitions. This approach is very promising as the short diffusion distance leads to fast surface-like kinetics in addition to having charge storage through redox reactions. The guide lines presented in this paper provide a basis for developing a variety of materials systems and a new generation of energy storage devices which exhibit pseudocapacitive responses. BIOGRAPHY: Bruce Dunn is the Nippon Sheet Glass Professor of Materials Science and Engineering at UCLA. Prior to joining UCLA, he was a staff scientist at the General Electric Research and Development Center. His research interests concern the synthesis of inorganic and organic/inorganic materials, and the characterization of their electrical, optical, biological and electrochemical properties. A continuing theme in his research is the use of sol-gel methods to synthesize materials with designed microstructures and properties. His recent work on electrochemical energy storage includes three-dimensional micro batteries and pseudocapacitor materials for high rate energy storage. He has received a number of honors including a Fulbright research fellowship, invited professorships at the University of Paris, the University of Bordeaux, the University of Toulouse, Shinshu University and two awards from the Department of Energy for outstanding research in Materials Science. He is a Fellow of the American Ceramic Society, the Materials Research Society and a member of the World Academy of Ceramics. In addition to serving on the Board of Reviewing Editors at Science, he is a member of the editorial boards of Advanced Energy Materials, Solid State Ionics, Advanced Electronic Materials and Journal of the American Ceramic Society.