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Proceedings Paper

Host-guest chemistry in the helical nanofilament phase (Conference Presentation)
Author(s): David Walba; Chenhui Zhu; Alexander Hexemer; Dong Ki Yoon; Hanim Kim; Eva D. Korblova; Dong Chen; Michael Tuchband; Noel Clark

Paper Abstract

The helical nanofilament (HNF) liquid crystal (LC) phase of bent core mesogens (also commonly termed the B4 phase) is among the most unique and exotic LC phases known. The structure involves a spontaneous hierarchical self assembly of molecules leading to a supramolecular twisted rod structure with a square cross section approximately 30 nm on a side, with the length of the filaments unconstrained. Based upon solid state NMR data, we have proposed that the helical nanofilaments actually represents an unusual assembly of organic crystalline nanoparticles, which form an LC phase, in the case of NOBOW existing in the temperature range between about 150°C and 110°C, which becomes a glass at temperatures below 110°C. That is, the HMF phase is not a typical molecular LC, but an LC of nanocrystals. Descriptions of the structure of these nanoparticles, their LC phases, and approaches to alignment will be given. Also, the fascinating and potentially useful behavior of the HNF phase as a host for other materials (LC and non-LC) in nanostructured composites will be presented.

Paper Details

Date Published: 3 November 2016
PDF: 1 pages
Proc. SPIE 9940, Liquid Crystals XX, 99400Y (3 November 2016); doi: 10.1117/12.2236100
Show Author Affiliations
David Walba, Univ. of Colorado Boulder (United States)
Chenhui Zhu, Lawrence Berkeley National Lab. (United States)
Alexander Hexemer, Lawrence Berkeley National Lab. (United States)
Dong Ki Yoon, KAIST (Korea, Republic of)
Hanim Kim, KAIST (Korea, Republic of)
Eva D. Korblova, Univ. of Colorado Boulder (United States)
Dong Chen, Harvard Univ. (United States)
Michael Tuchband, Univ. of Colorado Boulder (United States)
Noel Clark, Univ. of Colorado Boulder (United States)

Published in SPIE Proceedings Vol. 9940:
Liquid Crystals XX
Iam Choon Khoo, Editor(s)

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