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Issue 23, 2012
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Grain refinement and partitioning of impurities in the grain boundaries of a colloidal polycrystal

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Abstract

We study the crystallization of a colloidal model system in the presence of secondary nanoparticles which are acting as impurities. Using confocal microscopy, we show that the nanoparticles segregate in the grain boundaries of the colloidal polycrystal. We demonstrate that the texture of the polycrystal can be tuned by independently varying the nanoparticle volume fraction and the crystallization rate, and quantify our findings using standard models for the nucleation and growth of crystalline materials. Remarkably, we find that the segregation efficiency of the nanoparticles in the grain-boundaries is determined solely by the typical size of the crystalline grains.

Graphical abstract: Grain refinement and partitioning of impurities in the grain boundaries of a colloidal polycrystal

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Publication details

The article was received on 01 Mar 2012, accepted on 29 Mar 2012 and first published on 27 Apr 2012


Article type: Paper
DOI: 10.1039/C2SM25488C
Soft Matter, 2012,8, 6214-6219

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    Grain refinement and partitioning of impurities in the grain boundaries of a colloidal polycrystal

    N. Ghofraniha, E. Tamborini, J. Oberdisse, L. Cipelletti and L. Ramos, Soft Matter, 2012, 8, 6214
    DOI: 10.1039/C2SM25488C

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