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Issue 13, 2014
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Capillary force acting on a colloidal particle floating on a deformed interface

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Abstract

We analytically determine the lateral capillary force acting on a spherical colloid trapped at an interface of arbitrary shape. Our calculations, which are valid for colloids that are small with respect to the capillary length, take into account surface tension, pressure and gravity. We relate the force acting on the colloid to the shape of the liquid interface prior to colloid deposition. Our approach is a generalization of a previous study of ours [Ch. Blanc et al., Phys. Rev. Lett., 2013, 111, 058302] to the case in which gravity is present. Our findings are in agreement with the so-called Nicolson superposition approximation [D. Y. C. Chan, J. D. J. Henry and L. R. White, J. Colloid Interface Sci., 1981, 79, 410] and with the curvature-dependent capillary force predicted by Würger [A. Würger, Phys. Rev. E, 2006, 74, 041402], and extend these results by including higher-order terms in the ratio between the size of the colloid and the capillary length. We thoroughly validate our theoretical expressions by means of an exact nonlinear numerical calculation.

Graphical abstract: Capillary force acting on a colloidal particle floating on a deformed interface

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Publication details

The article was received on 11 Oct 2013, accepted on 11 Dec 2013 and first published on 12 Dec 2013


Article type: Paper
DOI: 10.1039/C3SM52622D
Citation: Soft Matter, 2014,10, 2197-2212

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    Capillary force acting on a colloidal particle floating on a deformed interface

    P. Galatola and J. Fournier, Soft Matter, 2014, 10, 2197
    DOI: 10.1039/C3SM52622D

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