121st General Meeting of the KCS

Type Poster Presentation
Area Physical Chemistry
Room No. Event Hall
Time 4월 20일 (금요일) 11:00~12:30
Code PHYS.P-142
Subject Ensemble probe rotational measurement using imaging rotational fluorescence correlation spectroscopy (irFCS)
Authors Soohyun Lee, Keewook Paeng*
Department of Chemistry, Sungkyunkwan University, Korea
Abstract Segmental dynamics of polystyrene near the glass transition temperature was studied by ensemble probe reorientation measurements. Imaging rotational fluorescence correlation spectroscopy (irFCS) which was developed by a simple modification of a single molecule method was utilized. In irFSC, EMCCD (electron-multiplying charge-coupled device) camera acquires time sequenced, orthogonally polarized fluorescence images of the probe doped polymer film simultaneously. By comparing the intensities of the orthogonally polarized images, ensemble rotational dynamics of probe molecules can be obtained. The concentrations of probe molecule in the polymer films were varied and the result from the ensemble measurements of irFCS was compared with the single molecule measurements in order to separate the effect of spatial and temporal averaging of the polymer segmental dynamics in the context of dynamic heterogeneity of polymeric glasses.
E-mail freeziee@naver.com