GOMD-DGG 2015 Award Speakers
Jianrong Qiu, chair professor, Cheung Kong Scholars Programme, South China University of Technology, China
Title: Control of the metastable state of glasses
Abstract: Materials science deals with relationships between synthesis, structure, properties and performance of the materials. Glass is a special material featuring good homogeneity, variable composition, easy shaping and doping, owing to its meta-stable state and topological network structure. It is considered that the nature of glass and glass transition are among the most important problems in the field of condensed matter. However, no dramatic change of the glass properties can be realized by controlling fictive temperature of glass. We have focused our research on the change and enhancement of the properties of glass by manipulation of the metastable nature of glasses. This strategy allows for precise control of the microstructure of glasses by using external fields e.g. light, temperature and pressure, and the development of novel and enhanced functionalities by controlling electronic band structure, defect state and nano- or microstructure of glass. In this talk, I will highlight our recent research developments on the design and control of the optical properties of glass through fast-cooling, crystallization and phase separation. We have demonstrated the realization of ultra-broadband near-infrared emission via control of valence state of Bi ion, ligand field around transition metal ions and energy transfer between two active ions for broadband optical amplification and tunable laser. I will also introduce our results on the printing of three-dimensional nano- or microstructures and multiple functions inside glasses by fs laser based on multiphoton absorption assisted control of excited state of dopants and nanostructures. These studies are not only helpful for understanding the nature of glass, but also valuable for the fabrication of optical devices.
Biography: Qiu has published more than 500 papers in several fundamental areas of glass science and technology such as glasses and glass ceramics for broadband optical amplification and tunable laser, and femtosecond laser interaction with glass. He is coauthor of two books (“Glass for photonic devices” (with Prof. K. Hirao et al.)”; and “Femtosecond technology— Basis and application” (with Prof. K. Hirao)). He received his PhD from Okayama University, Japan, working in the Non-Crystalline Solids group under the guidance of Prof. Y. Miura and Prof. A. Osaka. Prof. Qiu received the Adachi Award from the Rare-earth Society of Japan in 1999, Otto-Schott Research Award from the Ernst Abbe Fund in 2005, and Academic Award from the Ceramic Society of Japan in 2007. He has been an associate editor or a member of international advisory boards of a number of prestigious journals, such as, Journal of Non-Crystalline Solids, Int. J. Appl. Glass Sci, Journal of the Asian Ceramic Societies, Frontiers in Materials-Glass Science and Journal of the Chinese Ceramic Society. Qiu has devoted much of his recent work to the understanding of the nature of glass and the development of techniques for realization of novel functions of glass. His current research continues in the fields of functional glasses, fs laser interaction with glass, and inorganic luminescent materials.
Varshneya Frontiers of Glass Science Lecture
Sabyasachi Sen, professor, University of California at Davis, USA
Title: Structural aspects of relaxational dynamics in glasses and supercooled liquids
Abstract: The structure of a liquid in equilibrium undergoes rapid rearrangement with time. The structural rearrangement processes, however, drastically slow down with decreasing temperature in a glass-forming liquid as the glass transition temperature Tg is approached from above and the liquid falls out of thermodynamic equilibrium. This kinetic slowdown is typically exemplified by the variation in the transport properties such as viscosity (or diffusivity) that can easily increase (or decrease) by ~ 15 orders of magnitude on cooling the liquid from T » 3*Tg to T » Tg. It is also at the very heart of nucleation and crystallization of a supercooled liquid and control the technological utility of glass and glass-ceramics. The dynamical processes associated with the viscous/diffusive transport have been treated in the literature principally as macroscopic phenomena within the framework of phenomenological models and often interrogated using bulk relaxation (volume, enthalpy, shear, dielectric, photon echo) experiments that typically lack a direct microscopic understanding of the atomic scale processes that accompany structural relaxation. On the other hand, the unique combination of the timescale associated with dynamical NMR spectroscopic techniques (ms to s) and the accompanying structural information, is ideally suited for probing the mechanistic aspects of the relaxational dynamics at atomic/molecular level in glasses and viscous liquids. In this talk I will present an overview of the work from our laboratory in the recent years involving the application of such spectroscopic techniques to address the nature and timescales of the various thermally driven configurational changes in a wide variety of inorganic and organic glasses and supercooled liquids and their relationship to macroscopic relaxation and transport processes.
Biography: Sen obtained his PhD in Geochemistry in 1996 from Stanford University where he was also a post-doctoral fellow until 1997. He then joined the faculty of the dept. of physics at the University of Wales, Aberystwyth in UK where he remained until 1999. Subsequently, he joined the R&D in Corning Inc. in NY, USA as a senior research scientist in the Glass Research group. He moved to the University of California at Davis in 2004 to join the faculty of the department of materials science and engineering as Associate Professor and was promoted to Professor in 2010. He has authored/co-authored more than 150 scientific papers and 7 US patents. He currently serves on the editorial boards of Journal of Non-Crystalline Solids, Materials Research Express and Earth and Planetary Materials. His current research interests include the application of state-of-the-art spectroscopic and diffraction techniques in understanding structure and dynamics in amorphous materials including glasses and glass-forming liquids, fast ion conduction in crystalline solid oxide electrolytes, battery materials and ionic liquids.
Varshneya Frontiers of Glass Technology Lecture
Steven B. Jung, chief technology officer, Mo-Sci Corporation, USA
Title: The present and future of glass in medicine
Abstract: Glass is already being used in medical applications from cancer treatment to tissue regeneration. The future of glass in medicine will require advances in chemical composition, shape / form factor, and processing to continue to improve treatment options for clinicians. The beauty of glass is that it can be almost anything we want; durable or degradable, solid or porous, it can be manipulated into almost any shape, and the list goes on. The uniqueness of the material properties of glass ultimately makes way for truly unique medical devices. This talk will focus on present advances in hard and soft tissue regeneration and why it is believed glass materials will remain a viable and growing option for the future of healing.
Biography: Jung is the chief technology officer at a specialty and healthcare glass manufacturer, Mo-Sci Corporation, which is located in Rolla, Missouri, USA. He received his Ph.D. in Materials Science and Engineering from the Missouri University of Science and Technology in 2010. There he studied bioactive glass scaffolds for hard and soft tissue regeneration. Steven is an inventor on 11 U.S. patents and ~50 US and international patents pending in the area of biomaterials. He is married to his wife Rachel and has a son Benjamin.