Ideal probe single molecule experiments reveal the intrinsic dynamic heterogeneity of a supercooled liquid

조회수 : 331 등록일 : 2015.11.05 09:35

일시 : 2015.11.04 17:00
소속 : 성균관대학교 화학과
발표자 : 팽기욱
장소 : R404
The concept of dynamic heterogeneity and the picture of the supercooled liquid as a mosaic of environments with distinct dynamics that interchange in time have been invoked to explain the non-exponential relaxations measured in these systems. The spatial extent and temporal persistence of these regions of distinct dynamics have remained challenging to identify. Here, single molecule fluorescence measurements using a probe similar in size and mobility to the host o-terphenyl unambiguously reveal exponential relaxations distributed in time and space and directly demonstrate ergodicity of the system down to the glass transition temperature. In the temperature range probed, at least 200 times the structural relaxation time of the host is required to recover ensemble averaged relaxation at every spatial region in the system.
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