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Issue 28, 2019
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Flow-driven disclination lines of nematic liquid crystals inside a rectangular microchannel

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Abstract

For nematic liquid crystals (LCs), a disclination line is formed when the director of the LCs changes abruptly. In this study, we demonstrate an approach to form dynamic disclination lines by flowing the nematic liquid crystal 4-cyano-4′-pentylbiphenyl (5CB) in rectangular microchannels with a large aspect ratio. The dynamic disclination line moves gradually from the side toward the centre of the microchannel when the Ericksen number reaches 8.5. At the critical Ericksen number, influence of the anchoring energy on the side wall extends to the centre of the microchannel and determines the final position of the dynamic disclination line. As a result, the orientation of the LC is influenced by surface defects of the side wall. This phenomenon can be used to detect minute surface defects on the side wall and is potentially useful for visual sensing applications that require high sensitivity.

Graphical abstract: Flow-driven disclination lines of nematic liquid crystals inside a rectangular microchannel

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Supplementary files

Article information


Submitted
03 May 2019
Accepted
13 Jun 2019
First published
14 Jun 2019

Soft Matter, 2019,15, 5638-5643
Article type
Paper

Flow-driven disclination lines of nematic liquid crystals inside a rectangular microchannel

Z. Liu, D. Luo and K. Yang, Soft Matter, 2019, 15, 5638
DOI: 10.1039/C9SM00900K

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