Microfabricated deflection tensiometers for insoluble surfactants

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We describe a technique that enables sensitive surface pressure measurements of insoluble surfactants with small quantities in enclosed systems. We microfabricate free-floating microtensiometers that rest at liquid interfaces. Our devices isolate clean interfaces from surfactant-laden ones and deform in response to the surface pressure difference. Elastic beam theory enables straightforward interpretation of the measurements and the deliberate engineering of the sensitivity and dynamic range of the device. Surface pressure isotherms for model surfactant monolayers measured using our microtensiometer show excellent agreement with a conventional Wilhelmy plate. (C) 2010 American Institute of Physics. [doi:10.1063/1.3491549]
Publisher
AMER INST PHYSICS
Issue Date
2010-09
Language
English
Article Type
Article
Keywords

LANGMUIR MONOLAYERS; COLLOIDAL PARTICLES; ISOTHERMS; STABILITY; FILMS

Citation

APPLIED PHYSICS LETTERS, v.97, no.13

ISSN
0003-6951
DOI
10.1063/1.3491549
URI
http://hdl.handle.net/10203/199126
Appears in Collection
CBE-Journal Papers(저널논문)
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