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Yu Seung Kim (yskim@lanl.gov)

Los Alamos National Laboratory

Abstract: A proper design of polymer electrolytes may result in significant performance and durability improvement in electrochemical devices. In this talk, I show some examples of how polymer electrolytes can bring remarkable performance improvement in low-temperature fuel cells, high-temperature fuel cells, alkaline anion-exchange membrane fuel cells, and alkaline water electrolyzers. Critical factors such as ionomer adsorption on the catalyst surface, the concentration of ionic functional groups, and polymer relaxation will be discussed to give insights to design high-performing electrochemical devices. 

Bio: Yu Seung Kim is a technical staff scientist at Los Alamos National Laboratory, USA. He received his B.S. degree from Korea University (1994) and his Ph.D. degree from Korea Advanced Institute of Science and Technology (1999) in the field of Chemical Engineering. He spent three years as a post-doctoral fellow at the ����vlog�ٷ���� Department of Virginia Tech before joining the fuel cell group at Los Alamos (2003). He received the Outstanding Technical Contribution and Achievements Award from US DOE Hydrogen and Fuel Cell Program (2016). His current research interest is materials for fuel cells and electrolyzers. 

Contact Dr. Susan Odom for Zoom link.

Reporting on flow battery environment using the intrinsic fluorescence of an organic redoxmer

Lily A. Robertson

Chemical Sciences & Engineering Division, Argonne National Laboratory

Abstract: To meet increasing discrepancies between the supply and demand of the electric grid, large-scale energy storage devices are needed. Redox flow batteries are frequently proposed to fill this gap as their liquid-filled tanks of redox-active material are highly scalable. Liquid electrolytes using nonaqueous solvents are of particular interest due to their wide electrochemical stability windows with inexpensive organic compounds acting as the redox-active species. In general, methods to track the state of health of the batteries lag far behind the development and study of new materials. The questions of how and why materials fail and whether batteries may be cured like a patient are pertinent. Most monitoring techniques examine state of charge changes and/or require aliquots of the flow battery solution. Not as many focus on in situ methods or other health issues such as species crossover. Therefore, we pursued a detailed study of new organic redox-active species (“redoxmers”) that are both strong flow battery performers and have an orthogonal “self-reporting” property that does not interfere with battery operation.[i] Here, we show that an organic anolyte redoxmer, 2,1,3-benzothiadiazole, can be synthetically modified using π-extending acetamide groups to have strong emissive properties useful for self-reporting. The redoxmer design had substantial impact on electrochemical performance with simple N-alkylation of the acetamide group giving optimal performance. Strong ion-molecule interactions were observed depending on supporting electrolyte choice in both states of charge. Finally, we used the strong emission of the redoxmer to track crossover of several practical flow solution conditions in real time. To our knowledge, our study is the first time fluorescence has been used to monitor a state of health property in a flow cell design.

Seth C. Rasmussen, Department of ����vlog�ٷ���� and Biochemistry, North Dakota State University

Abstract: Ethyl alcohol, or ethanol, is one of the most ubiquitous chemical compounds in the history of the chemical sciences. The generation of alcohol via fermentation is also one of the oldest forms of chemical technology, with the production of fermented beverages such as mead, beer, and wine predating the smelting of metals. By the 12th century, the ability to isolate alcohol from wine had moved this chemical species from a simple component of alcoholic beverages to both a new medicine and a powerful new solvent. Of course, this also began the long tradition of production of liqueurs and strong spirits for consumption. A general overview of the early history and chemistry of alcohol production and isolation will be presented, as well as some discussion of its early uses in both the chemical arts and medicine.

Contact Dr. Susan Odom for Zoom link.

Affiliation:

Research:

Abstract: Few aspects are as prevalent and important to energy conversion and storage as the dimension control of porous nanomaterial architectures. The study of nanostructure-dependent electrochemical behavior, however, has been broadly limited by access to well-defined nanomaterials with independent control over the pore and wall dimensions. This historic limitation is partially due to reliance upon dynamic self-assembly processes that progress towards equilibrium. We have developed a kinetically controlled micelle approach as a new nanofabrication tool kit.^1-5 Kinetic control is historically difficult to reproduce, a challenge that we have resolved, in part with switchable micelle entrapment^6-7 to yield reproducible and homogeneous nanomaterial series that follow model predictions. This approach enables seamless access from meso-to-macroporous materials with unprecedented ~2 Å precision of tuning, commensurate with the underlying atomic dimensions. This precision and independent control of architectures also opens new opportunities for nano-optimized devices.

Bio: Morgan Stefik obtained a B.E. in Materials Engineering from Cal Poly SLO in 2005 and a Ph.D. in Materials Science from Cornell University in 2010. After postdoctoral research at École Polytechnique Fédérale de Lausanne, he joined the University of South Carolina in 2013 in the Department of ����vlog�ٷ���� and Biochemistry. He was awarded an NSF-CAREER in 2018 and is the founding director of the South Carolina SAXS Collaborative. He was highlighted as a “rising star of materials chemistry” by RSC in 2017, was recognized as a Breakthrough Star by USC in 2018, and was elected to the council of the International Mesostructured Materials Association in 2018. Most recently, he was promoted to Associate Professor with tenure in 2019.

Affiliation:

Research:

Abstract: Sleep is conserved across all birds and mammals, and perhaps all animals, and yet its primary functions and reason for existence are still unclear.  We still cannot answer the simple question of why we sleep at all.  A major bottleneck in understanding sleep is the time and cost involved with EEG/EMG analysis (the gold standard for sleep in birds and mammals).  Therefore, my lab has spent the past twenty years developing a simple, noninvasive alternative using sensitive piezoelectric films, which has allowed for large scale genomic studies, more efficient drug screens, and the testing of sleep in a wide variety of rodent models for human disease.  Although we do not know the central functions of sleep very well, we now know that it strongly impacts almost all diseases including infections, cancer, heart disease, diabetes, obesity, Alzhiemer’s, and essentially every disease examined thus far.  Sufficient sleep is also critical for optimal performance and our sense of well-being.  Even a modest reduction of sleep from 7hrs/night to 5hrs/night reduces the average person’s performance to that of someone who is legally “drunk”.  Sleep traits, like almost all traits, are complex, and the specific alleles of specific genes that influence these traits in people and in mice have been difficult to determine.  However, we and other labs have begun to find patterns and pathways that may shed light on the most critical processes.  Sleep appears to serve many different functions that impact health and disease, a few of which are beginning to be understood, and will be highlighted in this talk.

Abstract: Soft materials are found in a host of application areas, from biotechnology and 3D printing to adhesives and soft devices. However understanding and controlling the behavior of very soft materials is an ongoing challenge. The Soft Materials and Interfaces group focuses on understanding the physics and mechanics of soft polymeric materials, including but not limited to gels, elastomers, and viscoelastic fluids, with an emphasis on responses at or near interfaces. When materials are sufficiently soft or the characteristic size scale is sufficiently small, soft solids display liquid-like characteristics – properties traditionally reserved for liquids emerge as an important part of the material response. In this talk, we introduce situations where combinations of solid and liquid characteristics control the mechanics of deformable interfaces. In particular, we discuss the importance of surface tension, surface stress, and phase separation for the interaction between a small adhesive particle and a soft elastomer. Based on confocal microscopy and colloidal probe experiments, a modified contact mechanics model is proposed. In the second part, we demonstrate tunable adhesive behavior of transient hydrogel networks that are crosslinked with metal-coordination bonds. Time permitting, we will introduce our current knowledge on how a liquid drop interacts with the surface of a soft polymer gel.

Bio: Jonathan Pham is an Assistant Professor of Materials Engineering at the ����vlog�ٷ����. He received a PhD in Polymer Science and Engineering from the University of Massachusetts Amherst where he investigated nanoparticle assembly and mechanics. During this time, he was a Chateaubriand fellow at ESPCI-ParisTech investigating deformation of microscale helical filaments in microfluidics. Prior to joining Kentucky, he was a Humboldt Postdoctoral Fellow at the Max Planck Institute for Polymer Research working on a range of topics, including cell-surface interactions and liquid drop impact.

Research:

Abstract: The physical organisation, from the molecular to the macro-scale, of essentially all macromolecular materials can profoundly affect the properties and features of the resulting architectures. I will discuss how rules that explain the mechanical properties of the Katana and distinguishes good from lesser tasty chocolates, can be applied to organic semiconductors to manipulate their properties and, hence, and their consequent performance when used as active layers in organic photovoltaic cells. To illustrate this, a survey will be given on the principles of structure development from the liquid phase with focus on how to  use phase diagrams to manipulate their phase transformations and solid-state order for the controlled design and manipulation of the final ‘morphology’ towards technological and practical applications.

Prof. Natalie Stingelin

School of Materials Science & Engineering, and School of Chemical & Biomolecular Engineering, Georgia Institute of Technology, Atlanta, GA, USA

Director, Center for Organic Photonics and Electronics, Georgia Institute of Technology, Atlanta, GA, USA

natalie.stingelin@gatech.edu

Short Bio: Natalie Stingelin is a Full Professor of Materials Science at the Georgia Institute of Technology, is Director of Georgia Tech’s Center for Organic Photonics and Electronics, and holds a Chaire Internationale Associée by the Excellence Initiative of the Université de Bordeaux. She had prior positions at Imperial College London; the Cavendish Laboratory, University of Cambridge; Queen Mary University of London, the Philips Research Laboratories, Eindhoven; and ETH Zürich. She is a Fellow of the Royal Society of ����vlog�ٷ���� and has been elected to the class of 2019 MRS Fellows. Furthermore, she was awarded the Institute of Materials, Minerals & Mining's Rosenhain Medal and Prize in 2014, and the Chinese Academy of Sciences (CAS) President's International Fellowship Initiative (PIFI) Award for Visiting Scientists in 2015. While at Imperial College, she was recipient of a European Research Council (ERC) Starting Grants, as well as an ERC Proof of Concept grant. She was the Chair of the 2016 Gordon Conference on 'Electronic Processes in Organic Materials' and the Zing conference on ‘Organic Semiconductors’. In 2018, she organized the 14th edition of the International Conference of Organic Electronics (ICOE). She has published >190 papers in the area of organic electronics & photonics, bioelectronics, physical chemistry of organic functional materials, and smart inorganic/organic hybrid systems.