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Proceedings Paper

The helical nanofilament phase as a host for creation of aligned, nanostructured composites (Presentation Recording)
Author(s): David M. Walba; Rebecca A. Callahan; Eva D. Korblova; Dong Chen; Yongqiang Shen; Michael Tuchband; Eric Carlson; Hanim Kim; Garry Rumbles; Sean E. Shaheen; Dong Ki Yoon; Noel A. Clark

Paper Abstract

The helical nanofilament (HNF) liquid crystal phase is a member of an unusual class of thermotropic phases with lamellar structures dominated by a tendency towards developing negative Gaussian curvature of the layers. Members of this family are sometimes termed “dark conglomerates,” due to their behavior in polarized light microscopy. These include a fluid phases - the high temperature dark conglomerate phase, which is a kind of sponge phase, and the low temperature dark conglomerate phase, also seemingly a sponge phase with structural details currently under investigation. The HNF phase, also a “dark conglomerate,” seems to be unique in the family, since slow conformational dynamics indicate a quasi-crystalline structure within layers, but no long range positional correlations across layers. We have been exploring possible applications of the HNF phase, which is highly porous, as a host for the formation of alignable composites for photovoltaics and other organic semiconductor applications. Recent results regarding the structure of these composites, including data suggesting a remarkably elegant nanostructure for HNF-chiral nematic composites, will be discussed.

Paper Details

Date Published: 5 October 2015
PDF: 1 pages
Proc. SPIE 9565, Liquid Crystals XIX, 95650Z (5 October 2015); doi: 10.1117/12.2189091
Show Author Affiliations
David M. Walba, Univ. of Colorado at Boulder (United States)
Rebecca A. Callahan, Univ. of Colorado at Boulder (United States)
Eva D. Korblova, Univ. of Colorado at Boulder (United States)
Dong Chen, Univ. of Colorado at Boulder (United States)
Yongqiang Shen, Univ. of Colorado at Boulder (United States)
Michael Tuchband, Univ. of Colorado at Boulder (United States)
Eric Carlson, Univ. of Colorado Boulder (United States)
Hanim Kim, KAIST (Korea, Republic of)
Garry Rumbles, National Renewable Energy Lab. (United States)
Sean E. Shaheen, Univ. of Colorado at Boulder (United States)
Dong Ki Yoon, KAIST (Korea, Republic of)
Noel A. Clark, Univ. of Colorado at Boulder (United States)

Published in SPIE Proceedings Vol. 9565:
Liquid Crystals XIX
Iam Choon Khoo, Editor(s)

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