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Issue 48, 2007
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Determining the mechanical response of particle-laden fluid interfaces using surface pressure isotherms and bulk pressure measurements of droplets

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Abstract

The mechanical response of particle-laden fluid interfaces is determined by measuring the internal pressures of particle-coated drops as a function of the drop volume. The particle monolayers undergoing compression–expansion cycles exhibit three distinct states: fluid state, jammed state, and buckled state. The PV curves are compared to the surface pressure isotherms ΠA that are measured using a Langmuir trough and a Wilhelmy plate on a flat water–decane interface covered with the same particles. We find that in the fluid and jammed states, the water drop in decane can be described by the Young–Laplace equation. Therefore in these relatively low compression states, the bulk pressure measurements can be used to deduce the interfacial tension of the droplets and yield similar surface pressure isotherms to the ones measured with the Wilhelmy plate. In the buckled state, the internal pressure of the drop yields a zero value, which is consistent with the zero interfacial tension measured with the Wilhelmy plate. Moreover we find that the compressibility in the jammed state does not depend on the particle size.

Graphical abstract: Determining the mechanical response of particle-laden fluid interfaces using surface pressure isotherms and bulk pressure measurements of droplets

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Article information


Submitted
13 Jun 2007
Accepted
06 Sep 2007
First published
20 Sep 2007

Phys. Chem. Chem. Phys., 2007,9, 6344-6350
Article type
Paper

Determining the mechanical response of particle-laden fluid interfaces using surface pressure isotherms and bulk pressure measurements of droplets

C. Monteux, J. Kirkwood, H. Xu, E. Jung and G. G. Fuller, Phys. Chem. Chem. Phys., 2007, 9, 6344
DOI: 10.1039/B708962G

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