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  • 02월 19일 23시 이후 : 초록수정 불가능, 일정확인 및 검색만 가능

제119회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Single Molecule Microscopy of Spatially Heterogeneous Dynamics in Supercooled 1,3,5-Tris(naphthyl)benzene

2017년 2월 16일 14시 47분 38초
PHYS.P-190 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
4월 20일 (목요일) 11:00~12:30
저자 및
이수현, 팽기욱*
성균관대학교 화학과, Korea
Amorphous systems lacking long range order in the temperature range between the melting temperature, Tm, and the glass transition temperature, Tg, are known as supercooled liquids. They remain one of the least understood types of condensed matter; therefore, their fundamental properties as well as applications are of interest. Supercooled liquids exhibit nonexponential relaxations and are believed to have sub-micron sized regions of molecules exhibiting relaxation times that can differ by orders of magnitude from these in neighboring regions. To observe the length scales over which these heterogeneous regions exist and the time scales on which they persist while avoiding ensemble averaging over multiple regions, a single molecule (SM) approach becomes crucial. SM fluorophores embedded in the glass former host are believed to mimic the dynamics of its surrounding molecules. By observing many individual probes' rotational relaxation rates simultaneously using wide field single molecule microscopy across temperatures near Tg, the dynamics of the supercooled liquid can be monitored. The breadth of rotational relaxation times will report on the spatial heterogeneity of the system while the changes in a particular probe's dynamics over time reports on temporal heterogeneity, i.e. whether the dynamics are changing from fast to slow or vice versa.