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Charge-, salt- and flexoelectricity-driven anchoring effects in nematics
Everts, Jeffrey Christopher (Author), Ravnik, Miha (Author)

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Abstract
We investigate the effects of electric double layers and flexoelectricity on the surface anchoring in general nematic fluids. Within a simplified model, we demonstrate for a nematic electrolyte how the surface anchoring strength can be affected by the surface charge, bulk ion concentration and/or flexoelectricity, effectively changing not only the magnitude of the anchoring but also the anchoring type, such as from planar to tilted. In particular, we envisage possible tuning of the anchoring strength by the salt concentration in the regime where sufficiently strong electrostatic anchoring, as controlled by the (screened) surface charge, can compete with the non-electrostatic anchoring. This effect is driven by the competing energetic-torque couplings between nematic director and the emergent electrostatic potential, due to surface charge, ions and flexoelectricity. Our findings propose a way of influencing surface anchoring by using electrostatic effects, which could be used in various aspects, including in the self-assembly of colloidal particles in nematic fluids, optical and display patterns, and sensing.

Language:English
Keywords:nematic fluids, electrostatics, electric double layer, flexoelectricity, surface anchoring
Tipology:1.01 - Original Scientific Article
Organization:FMF - Faculty of Mathematics and Physics
Year:2021
Number of pages:Str. 423-435
Numbering:Vol. 48, iss. 3
UDC:544.6/.7
ISSN on article:0267-8292
DOI:10.1080/02678292.2020.1786176 This link opens in a new window
COBISS.SI-ID:21920003 This link opens in a new window
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Downloads:45
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Record is a part of a journal

Title:Liquid crystals
Shortened title:Liq. cryst.
Publisher:Taylor & Francis
ISSN:0267-8292
COBISS.SI-ID:1690628 This link opens in a new window

Document is financed by a project

Funder:EC - European Commission
Funding Programme:H2020
Project no.:795377
Name:Topological Colloidal Double Layers
Acronym:TCDL

Funder:ARRS - Agencija za raziskovalno dejavnost Republike Slovenije (ARRS)
Project no.:P1-0099
Name:Fizika mehkih snovi, površin in nanostruktur

Funder:ARRS - Agencija za raziskovalno dejavnost Republike Slovenije (ARRS)
Project no.:L1-8135
Name:Biološka zdravila: detektor tvorbe proteinskih delcev na osnovi tekočih kristalov

Funder:ARRS - Agencija za raziskovalno dejavnost Republike Slovenije (ARRS)
Project no.:J1-1697
Name:Študij sil znotraj celic s pomočjo deformacij fotonskih kapljic

Secondary language

Language:Slovenian
Keywords:nematske tekočine, elektrostatika, električna dvojna plast, fleksoelektričnost, površinsko sidranje

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