第二十二届非氧化物和新型光学玻璃国际研讨会

Lecture Summary Biography
Structural origin of slow dynamics in glass-forming liquids
Hajime Tanaka
The University of Tokyo
As a liquid cools toward its glass transition point, its dynamics slow dramatically, yet the physical factors governing this process remain elusive. Our research has revealed that in fragile liquids with isotropic interactions, slow glassy dynamics result from the growth of spatially extensive, free-energy-driven angular order. Conversely, strong liquids with directional bonding develop energetically driven local structural order. Detecting such ordering is challenging due to its reliance on many-body correlations. When compatible with crystal symmetry, this ordering also acts as a precursor to crystal nucleation, influencing polymorph selection. These findings underscore the critical role of angular order in controlling slow glassy dynamics, crystallization, and glass-forming ability in supercooled liquids, regardless of fragility. If time permits, we will also discuss the microscopic mechanism behind the increasing activation energy of particle motion.
Structural origin of slow dynamics in glass-forming liquids
Hajime Tanaka
The University of Tokyo,
Hajime Tanaka, Professor Emeritus and Senior Program Advisor at the University of Tokyo, is renowned for his extensive contributions to soft matter and liquid physics. His research encompasses phase transitions, pattern formation, nonlinear rheology, water physics, liquid-liquid transition, glass transition, and crystallization. Awarded the Society of Polymer Science Award (1997) and the Humboldt Research Award (2006), he was elected Fellow of the Institute of Physics in 2007.
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