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Issue 14, 2011
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Depletion interactions caused by polydisperse, hard platelets

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Abstract

We investigate depletion interactions near a wall caused by polydisperse silica-coated gibbsite platelets, using total internal reflection fluorescence microscopy (TIRF) to characterize the sphere–wall interaction potential. As no theoretical model for polydisperse platelets exists, we extend a model for monodisperse depletant cylinders by assuming negligible thickness and averaging over the disc size distribution, finding nearly perfect matching with experimental data. The resulting averaged depletion potentials have, as predicted by the extended model, the same depth as monodisperse potentials, but differ in range and shape according to the size distribution. We compare mean particle sizes and standard deviations derived by TIRF with results from TEM measurements.

Graphical abstract: Depletion interactions caused by polydisperse, hard platelets

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Publication details

The article was received on 11 Mar 2011, accepted on 21 Apr 2011 and first published on 03 Jun 2011


Article type: Paper
DOI: 10.1039/C1SM05429E
Citation: Soft Matter, 2011,7, 6444-6450
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    Depletion interactions caused by polydisperse, hard platelets

    C. July, D. Kleshchanok and P. R. Lang, Soft Matter, 2011, 7, 6444
    DOI: 10.1039/C1SM05429E

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