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Article Dans Une Revue Nature Materials Année : 2015

Brownian diffusion of a partially wetted colloid

Résumé

The dynamics of colloidal particles at interfaces between two fluids plays a central role in microrheology, encapsulation, emulsification, biofilm formation, water remediation and the interface-driven assembly of materials. Common intuition corroborated by hydrodynamic theories, suggests that such dynamics is governed by a viscous force lower than that observed in the more viscous fluid. Here, we show experimentally that a particle straddling an air/water interface feels a large viscous drag that is unexpectedly larger than that measured in the bulk. We suggest that such a result arises from thermally activated fluctuations of the interface at the solid/air/liquid triple line and their coupling to the particle drag through the fluctuation–dissipation theorem. Our findings should inform approaches for improved control of the kinetically driven assembly of anisotropic particles with a large triple-line-length/particle-size ratio, and help to understand the formation and structure of such arrested materials.
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Dates et versions

hal-01202128 , version 1 (18-09-2015)

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Giuseppe Boniello, Christophe Blanc, Denys Fedorenko, Mayssa Medfai, Nadia Ben Mbarek, et al.. Brownian diffusion of a partially wetted colloid. Nature Materials, 2015, 14 (9), pp.908. ⟨10.1038/NMAT4348⟩. ⟨hal-01202128⟩
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