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Title: Light-activated helical inversion in cholesteric liquid crystal microdroplets

Abstract

Cholesteric liquid crystal (CLC) droplets exhibit nontrivial topological features, which are controlled by the ratio between the cholesteric pitch and the droplet radius. The radial spherical structure (RSS) is of particular interest, as it reveals an onion-like concentric organization of the cholesteric helices, leading to the expression of spherical Bragg microcavities. Using an overcrowded alkene-based unidirectional molecular motor as a dopant, we show that the topological defect structure in the droplet can be activated by illumination. By using appropriate molecular motor concentrations, light can either break the symmetry of topological defects (as observed for the bent-twisted bipolar structure), or it can induce inversion of handedness in an onion-like organization (in the case of RSS). This latter feature may pave the way toward alternative activation modes of lasers based on cholesteric droplets. By also studying CLC droplets once they have reached full photoconversion at photostationary state (PSS), we highlight that the strong influence of confinement on the droplets structure occurs to the same extent after the helix inversion event. Here our results are interpreted in terms of numerical simulations of the droplets’ structure, which shed light on the major role played by curvature close to the droplets’ center, this latter onemore » becoming dominant when the droplet radius is small.« less

Authors:
 [1];  [2];  [3];  [2];  [3];  [4]
  1. Univ. of Twente, Enschede (The Netherlands); Sorbonne Univ., Paris (France)
  2. The Univ. of Chicago, Chicago, IL (United States)
  3. Univ. of Twente, Enschede (The Netherlands)
  4. Sorbonne Univ., Paris (France)
Publication Date:
Research Org.:
Univ. of Wisconsin, Madison, WI (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division
OSTI Identifier:
1511034
Grant/Contract Number:  
SC0004025
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Proceedings of the National Academy of Sciences of the United States of America
Additional Journal Information:
Journal Volume: 115; Journal Issue: 17; Journal ID: ISSN 0027-8424
Publisher:
National Academy of Sciences, Washington, DC (United States)
Country of Publication:
United States
Language:
English
Subject:
59 BASIC BIOLOGICAL SCIENCES; chiral liquid crystals; droplets; confinement; photoinduced helix inversion; molecular motors

Citation Formats

Sleczkowski, Piotr, Zhou, Ye, Iamsaard, Supitchaya, de Pablo, Juan J., Katsonis, Nathalie, and Lacaze, Emmanuelle. Light-activated helical inversion in cholesteric liquid crystal microdroplets. United States: N. p., 2018. Web. doi:10.1073/pnas.1720742115.
Sleczkowski, Piotr, Zhou, Ye, Iamsaard, Supitchaya, de Pablo, Juan J., Katsonis, Nathalie, & Lacaze, Emmanuelle. Light-activated helical inversion in cholesteric liquid crystal microdroplets. United States. doi:10.1073/pnas.1720742115.
Sleczkowski, Piotr, Zhou, Ye, Iamsaard, Supitchaya, de Pablo, Juan J., Katsonis, Nathalie, and Lacaze, Emmanuelle. Fri . "Light-activated helical inversion in cholesteric liquid crystal microdroplets". United States. doi:10.1073/pnas.1720742115. https://www.osti.gov/servlets/purl/1511034.
@article{osti_1511034,
title = {Light-activated helical inversion in cholesteric liquid crystal microdroplets},
author = {Sleczkowski, Piotr and Zhou, Ye and Iamsaard, Supitchaya and de Pablo, Juan J. and Katsonis, Nathalie and Lacaze, Emmanuelle},
abstractNote = {Cholesteric liquid crystal (CLC) droplets exhibit nontrivial topological features, which are controlled by the ratio between the cholesteric pitch and the droplet radius. The radial spherical structure (RSS) is of particular interest, as it reveals an onion-like concentric organization of the cholesteric helices, leading to the expression of spherical Bragg microcavities. Using an overcrowded alkene-based unidirectional molecular motor as a dopant, we show that the topological defect structure in the droplet can be activated by illumination. By using appropriate molecular motor concentrations, light can either break the symmetry of topological defects (as observed for the bent-twisted bipolar structure), or it can induce inversion of handedness in an onion-like organization (in the case of RSS). This latter feature may pave the way toward alternative activation modes of lasers based on cholesteric droplets. By also studying CLC droplets once they have reached full photoconversion at photostationary state (PSS), we highlight that the strong influence of confinement on the droplets structure occurs to the same extent after the helix inversion event. Here our results are interpreted in terms of numerical simulations of the droplets’ structure, which shed light on the major role played by curvature close to the droplets’ center, this latter one becoming dominant when the droplet radius is small.},
doi = {10.1073/pnas.1720742115},
journal = {Proceedings of the National Academy of Sciences of the United States of America},
issn = {0027-8424},
number = 17,
volume = 115,
place = {United States},
year = {2018},
month = {4}
}

Journal Article:
Free Publicly Available Full Text
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