Sen, Sabyasachi - University of California, Davis - Department of Materials Science and Engineering

个人简介

B.S. University of Calcutta, 1987 M.S. University of Calcutta, 1989 M.S. University of Houston, 1991 Ph.D. Stanford University, 1996

研究领域

A liquid, if it does not crystallize on cooling, can undergo a “glass transition”, a falling-out-of equilibrium in terms of motion and rearrangement of its molecular constituents. The rapid increase in viscosity near the glass transition temperature, Tg, transforms the flowing liquid into a rigid solid without the long-range order characteristic of crystals. Glassy materials are ubiquitous, we use them as building material, to make optic fiber for telecommunication, flat panels for optical display, lenses for camera and telescope, to replace small bones in our body and as host materials for encapsulation of radioactive waste and preservation of biomaterials and drugs. Organic glassy phases are polymers, and sugar candy. Finally, glasses also occur in nature as volcanic rocks and in outer space as glassy ice! Most people realize that these are hard and solid-like at room temperature but soften and flow on heating. But few realize the commonality of phenomena in the glassy state as applied to these and other systems. The distinctive behavior of the glassy and liquid states, and of the glass transition relating them, has ramifications for processes as diverse as semiconductor, glass, plastic and food manufacturing, volcanism, the survival of bacterial spores, and the preservation of red blood cells in vitro.

近期论文

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B. Kalkan, S. Sen, S.M. Clark, “Nature of Phase Transitions in Crystalline and Amorphous GeTe-Sb2Te3 Phase Change Materials”, Journal of Chemical Physics, 135, 124510, 2011. N.K. Nasikas, S. Sen, G.N. Papatheodorou, “Silicate Glasses at the Ionic Limit: Alkaline-Earth Sub-Orthosilicates”, Chemistry of Materials, 23, 3692, 2011. N.K. Nasikas, V. Drakopoulos, S. Sen, G.N. Papatheodorou, “Vibrational modes and the boson peak of Y2O3-Al2O3 glasses”, Physics and Chemistry of Glasses, 52, 143, 2011. N.K. Nasikas, S. Sen, G.N. Papatheodorou, “Structural Nature of Polyamorphism in Y2O3–Al2O3Glasses”, Chemistry of Materials, 23, 2860, 2011. Z. Xue, T.G. Edwards, S.Sen, Structural Evolution During Precipitation of Alkaline-Earth Fluoride Nanocrystals in Oxyfluoride Glasses: A Multinuclear Nuclear Magnetic Resonance Spectroscopic Study, J. Am. Ceram. Soc. xx, 2011. Vladimir Martis, Sergey Nikitenko, Sabyasachi Sen, Gopinathan Sankar, Wouter van Beek, Yaroslav Filinchuk, Irina Snigireva, and Wim Bras, Effects of X-rays on Crystal Nucleation in Lithium Disilicate, Crystal Growth and Design, 11, 2858 (2011). B. Kalkan, S. Sen, B.G. Aitken, S.V. Raju, S.M. Clark, “Negative P-T slopes characterize phase change processes: Case of the Ge1Sb2Te4 phase change alloy”, Physical Review B, 84, 014202, 2011. T.G. Edwards and S. Sen, Structure and Relaxation in Germanium Selenide Glasses and Supercooled Liquids: A Raman Spectroscopic Study, J. Phys. Chem. B, 115, 4307-14 (2011). N. Ollier, J.-L. Doualan , V. Pukhkaya , T. Charpentier , R. Moncorgé, S. Sen, Evolution of Yb3+ environment and luminescence properties under ionizing irradiation in aluminoborosilicate glasses, J. Non-Cryst. Solids, 357, 1037 (2011). Michael C. Davis, Kevin J. Sanders, Philip J. Grandinetti, Sarah J. Gaudio, Sabyasachi Sen, Structural investigations of magnesium silicate glasses by 29Si 2D Magic-Angle Flipping NMR, J. Non-Cryst. Solids,xxxx (2011). T G Edwards, E L Gjersing, Sabyasachi Sen, S C Currie, Bruce G Aitken, 125Te NMR chemical shifts and tellurium coordination environments in crystals and glasses in the Ge–As–Sb–Te system, J. Non-Cryst. Solids, 357, 3036 (2011). E.L. Gjersing, S. Sen, B.G. Aitken, Molecular Dynamics in Supercooled P-Se Liquids near the GlassTransition: Results from 31P NMR Spectroscopy, J. Phys. Chem. B, 115, 2857 (2011).