Electroosmosis near surfactant laden liquid–air interfaces | Zendy

Baptiste Blanc | Zendy; Oriane Bonhomme | Zendy; PierreFrançois Brevet | Zendy; Emmanuel Bénichou | Zendy; Christophe Ybert | Zendy; AnneLaure Biance | Zendy

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Electroosmosis near surfactant laden liquid–air interfaces

Author(s) -

Baptiste Blanc,

Oriane Bonhomme,

PierreFrançois Brevet,

Emmanuel Bénichou,

Christophe Ybert,

AnneLaure Biance

Publication year - 2018

Publication title -

soft matter

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.99

H-Index - 170

eISSN - 1744-6848

pISSN - 1744-683X

DOI - 10.1039/c7sm02508d

Subject(s) - pulmonary surfactant , ionic liquid , chemical engineering , flow (mathematics) , interface (matter) , chemistry , liquid flow , liquid air , materials science , chemical physics , nanotechnology , mechanics , organic chemistry , physics , engineering , catalysis , gibbs isotherm

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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