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Published in: Colloid and Polymer Science 8/2014

01-08-2014 | Original Contribution

Diffusion of isolated surface-active molecules at the air/water interface

Authors: Zhaolou Cao, Dapeng Wang, Kaloian Koynov, Hans-Jürgen Butt

Published in: Colloid and Polymer Science | Issue 8/2014

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Abstract

Fluorescence correlation spectroscopy was applied to study the diffusion of isolated surface-active molecules at air/water interfaces. Rhodamine 6G was used as a surface-active fluorescent tracer. Results show that the diffusion coefficient of the Rhodamine 6G at the interface is about 2.5 times higher than in the bulk. Effects of Rhodamine 6G concentration and added SDS or CTAB surfactants have been studied. Diffusion of Rhodamine 6G at the interface is slowed down at surfactant concentration corresponding to a mean distance between molecules of 10 and 40 nm, indicating a long-range interaction.

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Metadata
Title
Diffusion of isolated surface-active molecules at the air/water interface
Authors
Zhaolou Cao
Dapeng Wang
Kaloian Koynov
Hans-Jürgen Butt
Publication date
01-08-2014
Publisher
Springer Berlin Heidelberg
Published in
Colloid and Polymer Science / Issue 8/2014
Print ISSN: 0303-402X
Electronic ISSN: 1435-1536
DOI
https://doi.org/10.1007/s00396-014-3272-2

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