Microfluidic osmotic compression of a charge-stabilized colloidal dispersion: Equation of state and collective diffusion coefficient
Soft Condensed Matter
2022-02-03 v1 Fluid Dynamics
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.
Keywords
Cite
@article{arxiv.2202.01024,
title = {Microfluidic osmotic compression of a charge-stabilized colloidal dispersion: Equation of state and collective diffusion coefficient},
author = {Camille Keita and Yannick Hallez and Jean-Baptiste Salmon},
journal= {arXiv preprint arXiv:2202.01024},
year = {2022}
}
Comments
7 pages, 4 figures