Bulletin of the American Physical Society
2023 APS March Meeting
Volume 68, Number 3
Las Vegas, Nevada (March 5-10)
Virtual (March 20-22); Time Zone: Pacific Time
Session AAA04: V: Spectroscopy and Experiment in Chemical Physics
12:30 PM–2:06 PM,
Wednesday, March 22, 2023
Room: Virtual Room 4
Sponsoring
Unit:
DCP
Chair: Xingjian Wang, University of Alabama in Huntsville
Abstract: AAA04.00006 : Polymer-like modes in shear mechanical spectra of phenylpropanols: The influence of hydrogen-bonded structures*
1:30 PM–1:42 PM
Presenter:
Mathias Mikkelsen
(Roskilde University)
Authors:
Mathias Mikkelsen
(Roskilde University)
Jan P Gabriel
(Roskilde University)
Contrary to other monoalcohols, the phenylpropanols do not show a bimodal behaviour in the their dielectric response, but a single, rather narrow process. Combined dielectric and light scattering spectra [Böhmer et al., J. Phys. Chem. B, 123, 10959] have shown that this single peak may be separated into a self- and a cross-correlation part, thus indicating that phenylpropanols do display features originating from hydrogen-bonded structures.
The shear mechanical spectra support that interpretation, demonstrating a subtle, yet clear, low-frequency polymer-like mode, similar to what is found in other monoalcohols. An analysis of the characteristic time scales found in the spectra show that shear relaxation is faster than the dielectric and that time scale separation of the dielectric Debye and alpha process is temperature independent and near identical in all the phenylpropanols.
*This work was supported by the VILLUM Foundation’s Matter grant (grant no. 16515) and by Innovation Fund Denmark
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