Effect of iron-iron oxide particles on the rate of isomerization of azobenzene moieties in polymeric liquid crystals at air-water interface

Raghavendra, R and Gupta, SK and Kumar, B (2020) Effect of iron-iron oxide particles on the rate of isomerization of azobenzene moieties in polymeric liquid crystals at air-water interface. In: Colloid and Polymer Science .

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Abstract

We have studied the effect of iron-iron oxide particles on the trans-cis isomerization of azobenzene moieties in the novel polyethylene glycol itaconate-azobenzene based side chain liquid crystalline polymer (PEGIA). Langmuir monolayers of the PEGIA molecules are spread at air-water interface, with water subphase containing different concentrations of iron-iron oxide particles. The kinetics of the isomerization of azobenzene moieties in the polymer was studied by surface manometry technique. We find that the presence of iron-iron oxide particles in the subphase affects the rate constant of trans-cis photoisomerization and it decreases exponentially as a function of concentration of particles in the subphase. The critical concentration of iron-iron oxide particles above which the rate constant of photoisomerization negligibly changed was found to be about 2.468 μg cm� 3. © 2020, Springer-Verlag GmbH Germany, part of Springer Nature.

Item Type:	Journal Article
Publication:	Colloid and Polymer Science
Publisher:	Springer Science and Business Media Deutschland GmbH
Additional Information:	The copyright of this article belongs to Springer Science and Business Media Deutschland GmbH
Keywords:	Air; Azobenzene; Drug products; Isomerization; Isomers; Liquid crystals; Monolayers; Phase interfaces; Polymers; Rate constants, Air water interfaces; Azobenzene moiety; Critical concentration; Iron oxide particles; Langmuir monolayers; Polymeric liquid crystal; Side chain liquid crystalline polymer; Trans-cis isomerization, Iron oxides
Department/Centre:	Division of Chemical Sciences > Inorganic & Physical Chemistry
Date Deposited:	26 Feb 2021 10:48
Last Modified:	26 Feb 2021 10:48
URI:	http://eprints.iisc.ac.in/id/eprint/67437

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