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- W3100110986 abstract "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/s and 5 $mu$m/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 dispersion $D(varphi)$ over a wide concentration range $varphi=0.24$-$0.5$, i.e. from the liquid dispersed state to the solid glass regime, with a high accuracy. The measured values of $D(varphi)simeq 5$-$12 D_0$ are significantly larger than the simple estimate $D_0$ given by the Stokes-Einstein relation, thus highlighting the important role played by the colloidal interactions in such dispersions." @default.
- W3100110986 created "2020-11-23" @default.
- W3100110986 creator A5020812736 @default.
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- W3100110986 date "2020-01-01" @default.
- W3100110986 modified "2023-09-30" @default.
- W3100110986 title "Collective diffusion coefficient of a charged colloidal dispersion: interferometric measurements in a drying drop" @default.
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- W3100110986 doi "https://doi.org/10.1039/d0sm00860e" @default.
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