%0 Journal Article
%T Off-Equilibrium Surface Tension in Colloidal Suspensions
%+ Matière Molle
%A Truzzolillo, Domenico
%A Mora, Serge
%A Dupas, Christelle
%A Cipelletti, Luca
%< avec comité de lecture
%Z L2C:14-019
%@ 0031-9007
%J Physical Review Letters
%I American Physical Society
%V 112
%N 12
%P 128303
%8 2014
%D 2014
%R 10.1103/PhysRevLett.112.128303
%Z PACS: 82.70.Dd, 68.05.-n, 83.80.Hj
%Z Physics [physics]/Condensed Matter [cond-mat]/Soft Condensed Matter [cond-mat.soft]Journal articles
%X We study the fingering instability of the interface between two miscible fluids, a colloidal suspension and its own solvent. The temporal evolution of the interface in a Hele-Shaw cell is found to be governed by the competition between the nonlinear viscosity of the suspension and an off-equilibrium, effective surface tension Γe. By studying suspensions in a wide range of volume fractions, Φ, we show that Γe∼Φ^2, in agreement with Korteweg's theory for miscible fluids. The surface tension exhibits an anomalous increase with particle size, which we account for using entropy arguments.
%G English
%2 https://hal.science/hal-00966355/document
%2 https://hal.science/hal-00966355/file/1312.4427.pdf
%L hal-00966355
%U https://hal.science/hal-00966355
%~ CNRS
%~ L2C
%~ MIPS
%~ UNIV-MONTPELLIER
%~ UM-2015-2021