Shear wave propagation in a liquid crystal: An inelastic X-ray scattering study-Reference-Cited by-同舟云学术

Shear wave propagation in a liquid crystal: An inelastic X-ray scattering study

Published:2024-06-21 Issue:23 Volume:160 Page:
ISSN:0021-9606
Container-title:The Journal of Chemical Physics
language:en
Short-container-title:

Author:

Lynch S. T.¹^ORCID,De Francesco A.²³^ORCID,Scaccia L.⁴^ORCID,Suvorov A.⁵^ORCID,Cai Y. Q.⁵^ORCID,Agra-Kooijman D. M.⁶^ORCID,Sharpnack L. L.⁷^ORCID,Kumar Satyendra⁸^ORCID,Cunsolo A.¹^ORCID

Affiliation:

1. Department of Physics, University of Wisconsin - Madison 1 , 1150 University Avenue, Madison, Wisconsin 53706, USA

2. CNR - Istituto Officina dei Materiali (IOM), Grenoble, INSIDE@ILL 2 , 71 Avenue des Martyrs, Grenoble CEDEX 9, France

3. Institut Laue Langevin 3 , 72 Avenue des Martyrs, F-38042 Grenoble, France

4. Dipartimento di Economia e Diritto, Università di Macerata 4 , Via Crescimbeni 20, 62100 Macerata, Italy

5. National Synchrotron Light Source II, Brookhaven National Laboratory 5 , Upton, New York 11973, USA

6. AMLCI, Kent State University 6 , Kent, Ohio 44240, USA

7. Earth Science and Environmental Studies, University of California 7 , Santa Barbara, California 93106, USA

8. Department of Physics and Division of Research and Economic Development, University at Albany 8 , Albany, New York 12222, USA

Abstract

We investigated the spectrum of density fluctuations of a liquid crystal, CB7CB, in two different orientations by using high-resolution inelastic x-ray scattering. Our analysis, based on Bayesian principles, revealed that high-frequency collective excitations propagate through this mesoscale-ordered sample in a peculiar manner that lies somewhere between those observed in liquids and crystalline systems. Interestingly, when we probed longer length scales, a more pronounced solid-like response emerged. This was mainly characterized by anomalously sharp inelastic excitations and the onset of shear mode propagation. Comparison with previous x-ray diffraction results suggests a correlation between the observed behavior and the mesogen arrangement.

Publisher

AIP Publishing

Link

https://pubs.aip.org/aip/jcp/article-pdf/doi/10.1063/5.0212229/20007073/234505_1_5.0212229.pdf

Reference30 articles.

1. The onset of shear modes in the high frequency spectrum of simple disordered systems: Current knowledge and perspectives;Philos. Mag.,2016

2. Emergent optical phononic modes upon nanoscale mesogenic phase transitions;Nano Lett.,2017

3. Chiral heliconical ground state of nanoscale pitch in a nematic liquid crystal of achiral molecular dimers;Proc. Natl. Acad. Sci. U. S. A.,2013