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Issue 5, 2013
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A novel particle tracking method with individual particle size measurement and its application to ordering in glassy hard sphere colloids

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Abstract

Particle tracking is a key to single-particle-level confocal microscopy observation of colloidal suspensions, emulsions, and granular matter. The conventional tracking method has not been able to provide accurate information on the size of individual particles. Here we propose a novel method to localise spherical particles of arbitrarily relative sizes from either 2D or 3D (confocal) images either in a dilute or crowded environment. Moreover this method allows us to estimate the size of each particle reliably. We use this method to analyse local bond orientational ordering in a supercooled polydisperse colloidal suspension as well as the heterogeneous crystallisation induced by a substrate. For the former, we reveal non-trivial couplings of crystal-like bond orientational order and local icosahedral order with the spatial distribution of particle sizes: crystal-like order tends to form in regions where very small particles are depleted and the slightly smaller size of the central particle stabilizes icosahedral order. For the latter, on the other hand, we found that very small particles are expelled from crystals and accumulated on the growth front of crystals. We emphasize that such information has not been accessible by conventional tracking methods.

Graphical abstract: A novel particle tracking method with individual particle size measurement and its application to ordering in glassy hard sphere colloids

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Publication details

The article was received on 12 Sep 2012, accepted on 12 Oct 2012 and first published on 01 Nov 2012


Article type: Paper
DOI: 10.1039/C2SM27107A
Citation: Soft Matter, 2013,9, 1447-1457
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    A novel particle tracking method with individual particle size measurement and its application to ordering in glassy hard sphere colloids

    M. Leocmach and H. Tanaka, Soft Matter, 2013, 9, 1447
    DOI: 10.1039/C2SM27107A

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