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Updated: Oct 6, 2025

Generation and Control of Electrohydrodynamic Flows in Aqueous Electrolyte Solutions
Published on: September 7, 2018
Microfluidic osmotic compression of a charge-stabilized colloidal dispersion: Equation of state and collective
Camille Keita1, Yannick Hallez2, Jean-Baptiste Salmon1
1CNRS, Solvay, LOF, UMR 5258, Université Bordeaux, F-33600 Pessac, France.
Abstract:
We show, using a model coupling mass transport and liquid theory calculations for a charge-stabilized colloidal dispersion, that diffusion significantly limits measurement times of its equation of state (EOS), osmotic pressure vs composition, using the osmotic compression technique. Following this result, we present a microfluidic chip allowing one to measure the entire EOS of a charged dispersion at the nanoliter scale in a few hours. We also show that time-resolved analyses of relaxation to equilibrium in this microfluidic experiment lead to direct estimates of the collective diffusion coefficient of the dispersion in Donnan equilibrium with a salt reservoir.
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