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Title: Complex reorientation dynamics of sizable glass-formers with polar rotors revealed by dielectric spectroscopy
Authors: Rams-Baron, Marzena
Yao, Beibei
Cheng, Shinian
Dulski, Mateusz
Paluch, Marian
Keywords: sizable glass-formers; dielectric measurements; dielectric spectroscopy; polar rotors revealed
Issue Date: 2021
Citation: "The Journal of Physical Chemistry Letters" (2021), iss. 0, s. 11303-11307
Abstract: We present the results of dielectric measurements for three sizable glass-formers with identical nonpolar cores linked to various dipole-labeled rotors that shed new light on the picture of reorientation of anisotropic systems with significant moment of inertia revealed by broadband dielectric spectroscopy. The dynamics of sizable glass-formers formed by partially rigid molecular cores linked to small polar rotors in many respects differs from that of typical glass-formers. For instance, the extraordinarily large prefactors (τ0 > 10−12 s) in the Vogel− Fulcher−Tammann equation were found. The rich and highly diverse relaxation pattern was governed by the location of a dipole, its ability to rotate freely, and the degree of coupling to the motion of the entire sizable system.
DOI: 10.1021/acs.jpclett.1c03088
ISSN: 1948-7185
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