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The adsorption kinetics of the non-ionic surfactant C10E4 was studied by maximum bubble pressure (MPT-2) and drop/bubble shape analysis tensiometry (PAT-1). The two methods complement each other and show good agreement in the overlapping time range if the problem of the so-called initial load at the drop/bubble surface is considered properly. The adsorption appears to be diffusion-controlled, giving an average diffusion coefficient of the order of 1 · 10–10 m2 s–1. At higher surfactant concentrations, the adsorption rate tends to change to a nondiffusional mechanism, which is possibly caused by surface active impurities.
From J. Schulze-Schlarmann1 | C. Stubenrauch2 | R. Miller3
1 Engelhard Process Chemicals GmbH, Freundallee 23, 30173 Hannover, Germany
2 University College Dublin, School of Chemical and Bioprocess Engineering, Belfield, Dublin 4, Ireland
3 Max-Planck-Institut für Kolloid- und Grenzflächenforschung, Am Mühlenberg 1, D-14476 Golm, Germany
2 University College Dublin, School of Chemical and Bioprocess Engineering, Belfield, Dublin 4, Ireland
3 Max-Planck-Institut für Kolloid- und Grenzflächenforschung, Am Mühlenberg 1, D-14476 Golm, Germany
Appeared in Tenside Surfactants Detergents 2005/05, Page 307-312
Direct link: http://www.tsd-journal.com/TS100273
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Revision of the Adsorption Behavior of the Non-ionic Surfactant Tetraoxyethylene Decylether C10E4 at the Water/Air Interface [561 KB]
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