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Relaxation of abnormal rolls in planarly aligned electroconvection

DOI zum Zitieren dieses Dokuments: https://doi.org/10.1103/PhysRevE.59.1814
URN to cite this document: urn:nbn:de:bvb:703-epub-4046-8

Title data

Rudroff, Stefan ; Frette, Vidar ; Rehberg, Ingo:
Relaxation of abnormal rolls in planarly aligned electroconvection.
In: Physical Review E. Vol. 59 (February 1999) Issue 2 . - pp. 1814-1820.
ISSN 1550-2376
DOI: https://doi.org/10.1103/PhysRevE.59.1814

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Abstract

Experimental results on electroconvection in a planarly aligned nematic liquid crystal are reported. Special emphasis is given to an optical technique for investigating abnormal rolls, which are characterized by a twist in the director field. The order parameter of the twist is measured by ellipsometry. We have also carried out a numerical investigation of the optical setup using a transfer-matrix method. The relaxation time of the twist has been measured and compared to theoretical predictions. In particular, it is found that the twist in the abnormal rolls forces the director field at the glass surface to turn away from its preferred direction (weak anchoring). This distortion in the anchoring of the liquid crystal relaxes one order of magnitude slower than theory predicts for relaxation processes driven by elastic forces in bulk.

Further data

Item Type: Article in a journal
Keywords: Experimental determinations of smectic, nematic, cholesteric, and other structures; Liquid crystals; Modulation and optical transfer fuctions; Electro-optical effect; Electrokinetic effects.
DDC Subjects: 500 Science > 530 Physics
Institutions of the University: Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Chair Experimental Physics V > Chair Experimental Physics V - Univ.-Prof. Dr. Ingo Rehberg
Profile Fields > Advanced Fields > Nonlinear Dynamics
Faculties
Faculties > Faculty of Mathematics, Physics und Computer Science
Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics
Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Chair Experimental Physics V
Profile Fields
Profile Fields > Advanced Fields
Language: English
Originates at UBT: No
URN: urn:nbn:de:bvb:703-epub-4046-8
Date Deposited: 19 Feb 2019 10:00
Last Modified: 19 Feb 2019 10:00
URI: https://epub.uni-bayreuth.de/id/eprint/4046

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