4.6 Article

Collective diffusion coefficient of a charged colloidal dispersion: interferometric measurements in a drying drop

期刊

SOFT MATTER
卷 16, 期 35, 页码 8213-8225

出版社

ROYAL SOC CHEMISTRY
DOI: 10.1039/d0sm00860e

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资金

  1. Fonds de la Recherche Scientifique - F.N.R.S. (Postdoctoral Researcher Position of BS)
  2. European Space Agency (ESA)
  3. Belgian Federal Science Policy Office (BELSPO) through PRODEX Evaporation

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In the present work, we use Mach-Zehnder interferometry to thoroughly investigate the drying dynamics of a 2D confined drop of a charged colloidal dispersion. This technique makes it possible to measure the colloid concentration field during the drying of the drop at a high accuracy (about 0.5%) and with a high temporal and spatial resolution (about 1 frame per s and 5 mu m per pixel). These features allow us to probe mass transport of the charged dispersion in this out-of-equilibrium situation. In particular, our experiments provide the evidence that mass transport within the drop can be described by a purely diffusive process for some range of parameters for which the buoyancy-driven convection is negligible. We are then able to extract from these experiments the collective diffusion coefficient of the dispersionD(phi) over a wide concentration range phi= 0.24-0.5,i.e.from the liquid dispersed state to the solid glass regime, with a high accuracy. The measured values ofD(phi) similar or equal to 5-12D(0)are significantly larger than the simple estimateD(0)given by the Stokes-Einstein relation, thus highlighting the important role played by the colloidal interactions in such dispersions.

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