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Issue 10, 2007
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Photoresponsive anisotropic and isotropic gels of semicarbazide–azobenzene organogelators: the use of magnetic polymer colloids to detect gel–sol transformation

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Abstract

Photoinduced gel–sol transformation of semicarbazide–azobenzene-based organogels containing entrapped organic solvents (isotropic gel) and liquid-crystalline material (anisotropic gel) has been studied. Thin films (4 µm) of gel materials were used to study the gel–sol transformation, as thicker films possess high absorbance due to the relatively high concentration of the gelator molecules. Photoinduced transcis isomerization of the azobenzene units causes destruction of the gel structure, and the consequent change in viscosity has been investigated employing magnetic polymer colloids. In the gel state the movement of the colloids is restricted due to their entrapment within the gel fibers but upon irradiation the colloids are movable and align in the direction of an external magnet, indicating collapse of the gel structure.

Graphical abstract: Photoresponsive anisotropic and isotropic gels of semicarbazide–azobenzene organogelators: the use of magnetic polymer colloids to detect gel–sol transformation

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Publication details

The article was received on 02 May 2007, accepted on 27 Jul 2007 and first published on 17 Aug 2007


Article type: Paper
DOI: 10.1039/B706492F
Citation: Soft Matter, 2007,3, 1308-1311
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    Photoresponsive anisotropic and isotropic gels of semicarbazide–azobenzene organogelators: the use of magnetic polymer colloids to detect gel–sol transformation

    P. Deindörfer, R. Davis and R. Zentel, Soft Matter, 2007, 3, 1308
    DOI: 10.1039/B706492F

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