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Title: Electrostatically controlled surface boundary conditions in nematic liquid crystals and colloids

Abstract

Differing from isotropic fluids, liquid crystals exhibit highly anisotropic interactions with surfaces, which define boundary conditions for the alignment of constituent rod-like molecules at interfaces with colloidal inclusions and confining substrates. We show that surface alignment of the nematic molecules can be controlled by harnessing the competing aligning effects of surface functionalization and electric field arising from surface charging and bulk counterions. The control of ionic content in the bulk and at surfaces allows for tuning orientations of shape-anisotropic particles like platelets within an aligned nematic host and for changing the orientation of director relative to confining substrates. The ensuing anisotropic elastic and electrostatic interactions enable colloidal crystals with reconfigurable symmetries and orientations of inclusions.

Authors:
ORCiD logo [1]; ORCiD logo [1];  [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]
  1. Univ. of Colorado, Boulder, CO (United States)
Publication Date:
Research Org.:
Univ. of Colorado, Boulder, CO (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1611387
Grant/Contract Number:  
SC0010305; SC0019293
Resource Type:
Accepted Manuscript
Journal Name:
Science Advances
Additional Journal Information:
Journal Volume: 5; Journal Issue: 9; Journal ID: ISSN 2375-2548
Publisher:
AAAS
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; Science & Technology - Other Topics

Citation Formats

Mundoor, Haridas, Senyuk, Bohdan, Almansouri, Mahmoud, Park, Sungoh, Fleury, Blaise, and Smalyukh, Ivan I. Electrostatically controlled surface boundary conditions in nematic liquid crystals and colloids. United States: N. p., 2019. Web. https://doi.org/10.1126/sciadv.aax4257.
Mundoor, Haridas, Senyuk, Bohdan, Almansouri, Mahmoud, Park, Sungoh, Fleury, Blaise, & Smalyukh, Ivan I. Electrostatically controlled surface boundary conditions in nematic liquid crystals and colloids. United States. https://doi.org/10.1126/sciadv.aax4257
Mundoor, Haridas, Senyuk, Bohdan, Almansouri, Mahmoud, Park, Sungoh, Fleury, Blaise, and Smalyukh, Ivan I. Wed . "Electrostatically controlled surface boundary conditions in nematic liquid crystals and colloids". United States. https://doi.org/10.1126/sciadv.aax4257. https://www.osti.gov/servlets/purl/1611387.
@article{osti_1611387,
title = {Electrostatically controlled surface boundary conditions in nematic liquid crystals and colloids},
author = {Mundoor, Haridas and Senyuk, Bohdan and Almansouri, Mahmoud and Park, Sungoh and Fleury, Blaise and Smalyukh, Ivan I.},
abstractNote = {Differing from isotropic fluids, liquid crystals exhibit highly anisotropic interactions with surfaces, which define boundary conditions for the alignment of constituent rod-like molecules at interfaces with colloidal inclusions and confining substrates. We show that surface alignment of the nematic molecules can be controlled by harnessing the competing aligning effects of surface functionalization and electric field arising from surface charging and bulk counterions. The control of ionic content in the bulk and at surfaces allows for tuning orientations of shape-anisotropic particles like platelets within an aligned nematic host and for changing the orientation of director relative to confining substrates. The ensuing anisotropic elastic and electrostatic interactions enable colloidal crystals with reconfigurable symmetries and orientations of inclusions.},
doi = {10.1126/sciadv.aax4257},
journal = {Science Advances},
number = 9,
volume = 5,
place = {United States},
year = {2019},
month = {9}
}

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Cited by: 4 works
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    Colloidal interactions and unusual crystallization versus de-mixing of elastic multipoles formed by gold mesoflowers
    journal, January 2020