Open AccessPhotoisomerization-Controlled Phase Segregation in a Submicron Confined Azonematic Liquid Crystal
Author(s) -
B. Zupančič,
S. DiezBerart,
Daniele Finotello,
Oleg D. Lavrentovich,
Boštjan Zalar
Publication year - 2012
Publication title -
physical review letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.688
H-Index - 673
eISSN - 1079-7114
pISSN - 0031-9007
DOI - 10.1103/physrevlett.108.257801
Subject(s) - photoisomerization , materials science , phase diagram , liquid crystal , phase (matter) , planar , crystal (programming language) , deuterium , chemical physics , membrane , molecular physics , isomerization , optoelectronics , atomic physics , chemistry , catalysis , physics , organic chemistry , biochemistry , computer graphics (images) , computer science , programming language
Deuteron nuclear magnetic resonance is used to study the phase segregation behavior of photoisomerizable liquid crystal diheptylazobenzene (7AB) confined into cylindrical pores of Anopore membranes. It is demonstrated that the concentration of both components in a binary trans-7AB and cis-7AB mixture can be controlled dynamically using UV-illumination stimulated trans-to-cis photoisomerization and thermally induced cis-to-trans backisomerization. The so far elusive temperature-concentration phase diagram of such system is determined by comparative analysis of the behavior in bulk, thin-planar, and Anopore-confining geometry.
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