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Hydrodynamic instabilities in active cholesteric liquid crystals
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Whitfield, Carl A. , Adhyapak, Tapan Chandra, Tiribocchi, Adriano, Alexander, Gareth P., Marenduzzo, Davide and Ramaswamy, Sriram (2017) Hydrodynamic instabilities in active cholesteric liquid crystals. The European Physical Journal E, 40 (50). pp. 1-16. ISSN 1292-8941.
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Official URL: http://dx.doi.org/10.1140/epje/i2017-11536-2
Abstract
We describe the basic properties and consequences of introducing active stresses, with principal direction along the local director, in cholesteric liquid crystals. The helical ground state is found to be linearly unstable to extensile stresses, without threshold in the limit of infinite system size, whereas con- tractile stresses are hydrodynamically screened by the cholesteric elasticity to give a finite threshold. This is confirmed numerically and the non-linear consequences of instability, in both extensile and contractile cases, are studied. We also consider the stresses associated to defects in the cholesteric pitch (λ lines) and show how the geometry near to the defect generates threshold-less flows reminiscent of those for defects in active nematics. At large extensile activity λ lines are spontaneously created and can form steady-state patterns sustained by constant active flows.
Item Type: | Journal Article | ||||||
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Subjects: | Q Science > QC Physics | ||||||
Divisions: | Faculty of Science, Engineering and Medicine > Research Centres > Centre for Complexity Science Faculty of Science, Engineering and Medicine > Science > Physics |
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Library of Congress Subject Headings (LCSH): | Soft condensed matter., Liquid crystals. | ||||||
Journal or Publication Title: | The European Physical Journal E | ||||||
Publisher: | Springer | ||||||
ISSN: | 1292-8941 | ||||||
Official Date: | 24 April 2017 | ||||||
Dates: |
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Volume: | 40 | ||||||
Number: | 50 | ||||||
Page Range: | pp. 1-16 | ||||||
Status: | Peer Reviewed | ||||||
Publication Status: | Published | ||||||
Date of first compliant deposit: | 19 April 2017 | ||||||
Date of first compliant Open Access: | 21 April 2017 | ||||||
Funder: | Engineering and Physical Sciences Research Council (EPSRC), J C Bose Fellowship of the SERB, India | ||||||
Grant number: | EP/N007883/1, EP/J007404/1 | ||||||
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