Helical nanofilament phases

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In the formation of chiral crystals, the tendency for twist in the orientation of neighboring molecules is incompatible with ordering into a lattice: Twist is expelled from planar layers at the expense of local strain. We report the ordered state of a neat material in which a local chiral structure is expressed as twisted layers, a state made possible by spatial limitation of layering to a periodic array of nanoscale filaments. Although made of achiral molecules, the layers in these filaments are twisted and rigorously homochiral - a broken symmetry. The precise structural definition achieved in filament self-assembly enables collective organization into arrays in which an additional broken symmetry - the appearance of macroscopic coherence of the filament twist-produces a liquid crystal phase of helically precessing layers.
Publisher
American Association for the Advancement of Science
Issue Date
2009-07
Language
English
Article Type
Article
Keywords

SMECTIC LIQUID-CRYSTALS; ACHIRAL MOLECULES; TRANSITION; CHIRALITY; SYSTEMS; MODEL

Citation

SCIENCE, v.325, no.5939, pp.456 - 460

ISSN
0036-8075
DOI
10.1126/science.1170027
URI
http://hdl.handle.net/10203/96863
Appears in Collection
CBE-Journal Papers(저널논문)
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