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Issue 10, 2013
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Self-assembled hydrophobic surface generated from a helical nanofilament (B4) liquid crystal phase†

Hanim Kim,a   Youngwoo Yi,b   Dong Chen,b   Eva Korblova,c   David M. Walba,c   Noel A. Clark*b  and  Dong Ki Yoon*a  
Author affiliations

* Corresponding authors

a Graduate School of Nanoscience and Technology (WCU) and KINC, KAIST, Daejeon 305-701, Republic of Korea
E-mail: nandk@kaist.ac.kr
Fax: +82 42 350 1110
Tel: +82 42 350 1116

b Department of Physics and Liquid Crystal Materials Research Center, University of Colorado, Boulder, CO 80309, USA
E-mail: noel.clark@colorado.edu
Fax: +1 303 492 2998
Tel: +1 303 492 6420

c Department of Chemistry and Liquid Crystal Materials Research Center, University of Colorado, Boulder, CO 80309, USA

Abstract

Hydrophobic air/liquid crystal (LC) surfaces exhibiting self-assembled dual scale roughness have been made by simple cooling of a bent-core mesogen from its high temperature isotropic melt through two liquid crystal phases. The transition to the fluid smectic B2 phase generates micron-scale toric focal conic domains (TFCDs) at the surface. Upon further cooling into the hexatic smectic B4 phase these TFCD structures are preserved and become textured by the nanometer-sized helical nanofilaments (HNFs) of the B4. The resulting TFCD/HNF surface is hydrophobic and shows clear evidence for surface tension reduction characteristic of dual-scale roughness, suggesting a simple self-assembly-based approach to low surface tension surfaces using LC morphology.

Graphical abstract: Self-assembled hydrophobic surface generated from a helical nanofilament (B4) liquid crystal phase

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Article information

https://doi.org/10.1039/C3SM27221D
Submitted
26 Sep 2012
Accepted
14 Jan 2013
First published
31 Jan 2013
Soft Matter, 2013,9, 2793-2797
Article type
Communication
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Self-assembled hydrophobic surface generated from a helical nanofilament (B4) liquid crystal phase

H. Kim, Y. Yi, D. Chen, E. Korblova, D. M. Walba, N. A. Clark and D. K. Yoon, Soft Matter, 2013, 9, 2793
DOI: 10.1039/C3SM27221D

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