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Title: Change in Stripes for Cholesteric Shells via Anchoring in Moderation

Abstract

Chirality, ubiquitous in complex biological systems, can be controlled and quantified in synthetic materials such as cholesteric liquid crystal (CLC) systems. In this work, we study spherical shells of CLC under weak anchoring conditions. We induce anchoring transitions at the inner and outer boundaries using two independent methods: by changing the surfactant concentration or by raising the temperature close to the clearing point. The shell confinement leads to new states and associated surface structures: a state where large stripes on the shell can be filled with smaller, perpendicular substripes, and a focal conic domain (FCD) state, where thin stripes wrap into at least two, topologically required, double spirals. Focusing on the latter state, we use a Landau–de Gennes model of the CLC to simulate its detailed configurations as a function of anchoring strength. By abruptly changing the topological constraints on the shell, we are able to study the interconversion between director defects and pitch defects, a phenomenon usually restricted by the complexity of the cholesteric phase. Here this work extends the knowledge of cholesteric patterns, structures that not only have potential for use as intricate, self-assembly blueprints but are also pervasive in biological systems.

Authors:
 [1];  [2];  [3];  [3];  [4];  [5];  [1];  [1];  [1];  [3]
  1. Univ. of Pennsylvania, Philadelphia, PA (United States)
  2. Univ. of Pennsylvania, Philadelphia, PA (United States); Univ. of Tennessee, Knoxville, TN (United States)
  3. PSL Research Univ., Paris (France)
  4. Rowan Univ., Glassboro, NJ (United States)
  5. Univ. of Pennsylvania, Philadelphia, PA (United States); Univ. of Massachusetts, Amherst, MA (United States)
Publication Date:
Research Org.:
Univ. of Pennsylvania, Philadelphia, PA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1406400
Alternate Identifier(s):
OSTI ID: 1499089
Grant/Contract Number:  
FG02-05ER46199
Resource Type:
Published Article
Journal Name:
Physical Review. X
Additional Journal Information:
Journal Volume: 7; Journal Issue: 4; Journal ID: ISSN 2160-3308
Publisher:
American Physical Society
Country of Publication:
United States
Language:
English
Subject:
59 BASIC BIOLOGICAL SCIENCES

Citation Formats

Tran, Lisa, Lavrentovich, Maxim O., Durey, Guillaume, Darmon, Alexandre, Haase, Martin F., Li, Ningwei, Lee, Daeyeon, Stebe, Kathleen J., Kamien, Randall D., and Lopez-Leon, Teresa. Change in Stripes for Cholesteric Shells via Anchoring in Moderation. United States: N. p., 2017. Web. doi:10.1103/physrevx.7.041029.
Tran, Lisa, Lavrentovich, Maxim O., Durey, Guillaume, Darmon, Alexandre, Haase, Martin F., Li, Ningwei, Lee, Daeyeon, Stebe, Kathleen J., Kamien, Randall D., & Lopez-Leon, Teresa. Change in Stripes for Cholesteric Shells via Anchoring in Moderation. United States. doi:10.1103/physrevx.7.041029.
Tran, Lisa, Lavrentovich, Maxim O., Durey, Guillaume, Darmon, Alexandre, Haase, Martin F., Li, Ningwei, Lee, Daeyeon, Stebe, Kathleen J., Kamien, Randall D., and Lopez-Leon, Teresa. Wed . "Change in Stripes for Cholesteric Shells via Anchoring in Moderation". United States. doi:10.1103/physrevx.7.041029.
@article{osti_1406400,
title = {Change in Stripes for Cholesteric Shells via Anchoring in Moderation},
author = {Tran, Lisa and Lavrentovich, Maxim O. and Durey, Guillaume and Darmon, Alexandre and Haase, Martin F. and Li, Ningwei and Lee, Daeyeon and Stebe, Kathleen J. and Kamien, Randall D. and Lopez-Leon, Teresa},
abstractNote = {Chirality, ubiquitous in complex biological systems, can be controlled and quantified in synthetic materials such as cholesteric liquid crystal (CLC) systems. In this work, we study spherical shells of CLC under weak anchoring conditions. We induce anchoring transitions at the inner and outer boundaries using two independent methods: by changing the surfactant concentration or by raising the temperature close to the clearing point. The shell confinement leads to new states and associated surface structures: a state where large stripes on the shell can be filled with smaller, perpendicular substripes, and a focal conic domain (FCD) state, where thin stripes wrap into at least two, topologically required, double spirals. Focusing on the latter state, we use a Landau–de Gennes model of the CLC to simulate its detailed configurations as a function of anchoring strength. By abruptly changing the topological constraints on the shell, we are able to study the interconversion between director defects and pitch defects, a phenomenon usually restricted by the complexity of the cholesteric phase. Here this work extends the knowledge of cholesteric patterns, structures that not only have potential for use as intricate, self-assembly blueprints but are also pervasive in biological systems.},
doi = {10.1103/physrevx.7.041029},
journal = {Physical Review. X},
number = 4,
volume = 7,
place = {United States},
year = {2017},
month = {11}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
DOI: 10.1103/physrevx.7.041029

Citation Metrics:
Cited by: 9 works
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    Works referencing / citing this record:

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