科研之友
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摘要
Since its introduction, liquid viscosity and relaxation time tau have been considered intrinsic properties of a system that is essentially local in nature and therefore independent of system size. Dielectric relaxation experiments are performed in glycerol, and it is discovered that this is the case at high temperature only. At low temperature, tau increases with system size and becomes nonlocal. We discuss the origin of this effect in the theory based on liquid elasticity length, the length over which local relaxation events in a liquid interact via induced elastic waves. We find good agreement between experiment and theory.
- 出版日期2011-7-26
