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The Surface Rheological Signature of Geometric Isomers of an Azobenzene-Surfactant

Abstract

The equilibrium and dynamic surface properties of a photosensitive azobenzene-surfactant subject to illumination with UV and Vis-light leading to the respective geometric cis- and trans-isomers were studied. The adsorption layers formed by the soluble surfactant were characterized by pendant drop tensiometry and surface rheology using the oscillating bubble technique. Aqueous solutions corresponding to the geometric isomers could clearly be distinguished in terms of both their equilibrium and dynamic surface properties. The frequency dependence of the surface dilatational modulus could be described by the extended Lucassen van den Tempel (LvdT)-model. These findings can be interpreted in terms of changes of the dipole moment. Furthermore, they shed some light on the relation between molecular structure and macroscopic properties of the adsorption layer.

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Publication details

The article was received on 13 Feb 2018, accepted on 30 Mar 2018 and first published on 03 Apr 2018


Article type: Paper
DOI: 10.1039/C8CP01025K
Citation: Phys. Chem. Chem. Phys., 2018, Accepted Manuscript
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    The Surface Rheological Signature of Geometric Isomers of an Azobenzene-Surfactant

    M. J. Hofmann and H. Motschmann, Phys. Chem. Chem. Phys., 2018, Accepted Manuscript , DOI: 10.1039/C8CP01025K

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