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Journal Articles Physical Review Letters Year : 2014

Off-Equilibrium Surface Tension in Colloidal Suspensions

Domenico Truzzolillo
Serge Mora
Christelle Dupas
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Luca Cipelletti
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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.
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hal-00966355 , version 1 (03-06-2021)





Domenico Truzzolillo, Serge Mora, Christelle Dupas, Luca Cipelletti. Off-Equilibrium Surface Tension in Colloidal Suspensions. Physical Review Letters, 2014, 112 (12), pp.128303. ⟨10.1103/PhysRevLett.112.128303⟩. ⟨hal-00966355⟩
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