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Issue 15, 2017
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Phoretic motion of colloids in a phase separating medium

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Abstract

The enhanced motion of dispersed particles driven by a concentration gradient is the basis for diffusiophoresis. Here we present the dynamics of colloids in a phase separating medium probed by X-Ray Photon Correlation Spectroscopy (XPCS) in the ultra-small angle scattering range. Charge stabilized silica colloids suspended in a binary mixture of 3-methylpyridine and water/heavy water are preferentially wetted by 3-methylpyridine and consequently display a phoretic motion towards that phase upon demixing. This activity lasts for hundreds of seconds before the phase separation is complete and the enhanced motion is arrested as the colloids return to normal diffusive dynamics.

Graphical abstract: Phoretic motion of colloids in a phase separating medium

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Publication details

The article was received on 22 Dec 2016, accepted on 10 Mar 2017 and first published on 13 Mar 2017


Article type: Paper
DOI: 10.1039/C6SM02855A
Citation: Soft Matter, 2017,13, 2817-2822
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    Phoretic motion of colloids in a phase separating medium

    R. Dattani, E. F. Semeraro and T. Narayanan, Soft Matter, 2017, 13, 2817
    DOI: 10.1039/C6SM02855A

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