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Thermal and photo reversible gel–sol transition of azobenzene based liquid crystalline organogel

Paper ID Volume ID Publish Year Pages File Format Full-Text
27205 44009 2014 6 PDF Available
Title
Thermal and photo reversible gel–sol transition of azobenzene based liquid crystalline organogel
Abstract

•Hydrogen bonding favors the long-range self-assembly leading to an entangled network structure.•The non-liquid crystalline gelator can be converted into liquid crystalline organogel.•The organogel exhibited monotropic nematic and smectic A phases.•The trans-cis isomerization of the azobenzene moiety disrupts the entanglement of gel fibers of self-assembly resulting in gel–sol transition.•The organogel is capable of the thermal and photo induced transition from gel–sol and vice versa.

Azobenzene based photoresponsive gelator, 1,2-bis[4-(4-(10-decyloxy)phenylazo)]-benzoylhydrazine showing selective gelation in alcoholic solvent is described. Whilst their thermodynamic behaviors are investigated by polarized optical microscopy and differential scanning calorimetry, the related layer arrangement is measured by X-ray diffraction techniques in which the organogel shows monotropic liquid crystalline phase. Present work shows that the non-liquid crystalline gelator can be converted into liquid crystalline organogel in the presence of alcoholic solvent in which the trans-cis isomerization of the azobenzene moiety disrupts the entanglement of gel fibers of self-assembly resulting in gel–sol transition. The present result also shows that the organogel is capable of the thermal and photo induced transition from gel–sol and vice versa.

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Keywords
Liquid crystal; Nematic phase; Homeotropic alignment; Organogel; Azobenzene
First Page Preview
Thermal and photo reversible gel–sol transition of azobenzene based liquid crystalline organogel
Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 278, 15 March 2014, Pages 19–24
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering