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Updated: May 24, 2026

Characterizing Single-Molecule Conformational Changes Under Shear Flow with Fluorescence Microscopy
Published on: January 25, 2020
Conformational mobility of small molecules in glass-forming solutions studied by FTIR spectroscopy
A I Fishman1, A I Noskov, A A Stolov
1Kazan Federal University, Institute of Physics, Kremlevskaya st. 18, Kazan 420008, Russia. aif@ksu.ru
Abstract:
Small molecules with two or more stable conformations when embedded in a glass-forming liquid (matrix) serve the role of "conformational probes", i.e., their conformational transitions are used to follow local mobility in the matrix. In the present study, conformational probes were embedded in low-molecular-weight glass-forming liquids, and the molecular mobility was studied in a broad temperature range including the glass transition temperature (T(g)). Paraffin oil, dibutylphthalate, bis(2-ethylhexyl)phthalate and isopropylbenzene were used as glass-forming liquids while 1,2-dichloroethane, 1,2-diphenylethane, chlorocyclohexane and bromocyclohexane were used as conformational probes. For some of the matrix/probe systems, the conformational mobility was found to freeze-in at T(g), while for the others it froze-in at certain temperatures T(f)
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