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Article Dans Une Revue Physical Review Letters Année : 2013

Capillary force on a micrometric sphere trapped at a fluid interface exhibiting arbitrary curvature gradients

Michel Gross
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Martin In
Manouk Abkarian
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Jean-Baptiste Fournier
Paolo Galatola
Maurizio Nobili
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Résumé

We report theoretical predictions and measurements of the capillary force acting on a spherical colloid smaller than the capillary length that is placed on a curved uid interface of arbitrary shape. By coupling direct imaging and interferometry, we are able to measure the in situ colloid contact angle and to correlate its position with respect to the interface curvature. Extremely tiny capillary forces down to femto-Newton can be measured with this method. Measurements agree well with a theory relating the capillary force to the gradient of Gaussian curvature and to the mean curvature of the interface prior to colloidal deposition. Numerical calculations corroborate these results.
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hal-00840804 , version 1 (04-06-2021)

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Christophe Blanc, Denys Fedorenko, Michel Gross, Martin In, Manouk Abkarian, et al.. Capillary force on a micrometric sphere trapped at a fluid interface exhibiting arbitrary curvature gradients. Physical Review Letters, 2013, 111, pp.058302. ⟨10.1103/PhysRevLett.111.058302⟩. ⟨hal-00840804⟩
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