Electroosmosis near surfactant laden liquid-air interfaces

Soft Matter
Baptiste BlancAnne-Laure Biance

Abstract

Generation of an electroosmostic (EO) flow near a liquid-gas interface covered with ionic surfactants is experimentally investigated. A combination of microscopic flow measurements with a molecular characterization of the interface by second harmonic generation (SHG) shows that under an electrical forcing, although a liquid flow is generated below the free surface, the surfactants remain immobile. The zeta potential was then determined and compared to the surfactant surface coverage. This combination of experimental techniques opens the route to simultaneously probe the liquid flow near a soapy interface and the corresponding surfactant repartition affecting the hydrodynamic boundary condition.

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Citations

Jan 21, 2020·Langmuir : the ACS Journal of Surfaces and Colloids·Abdulkadir Hussein SheikHimiyage Chaminda Hemaka Bandulasena
Mar 14, 2020·Langmuir : the ACS Journal of Surfaces and Colloids·Yuki UematsuRoland R Netz
May 3, 2018·Langmuir : the ACS Journal of Surfaces and Colloids·Marco SchnurbusBjörn Braunschweig

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