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Issue 17, 2012
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Structural evolution of cuboidal granular media

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Abstract

Mono- and bi-disperse rectangular cuboidal granules are assembled from colloid-hydrogel suspensions via stop-flow lithography and fully submerged in hexadecane. Their packing density and structural evolution are studied as a function of agitation time using micro-computed X-ray tomography. When subjected to periodic agitation, the granule packing density increases logarithmically in time; concomitantly, the nearest-neighbor separation distance between granules decreases. Akin to spherical granular media, the distributions of Voronoi volume for these granule packings can be scaled using a shifted k-gamma probability distribution. This Boltzmann-type distribution maximizes packing entropy, indicating that the statistical mechanics approach to granular fluctuations is valid for non-spherical granular media.

Graphical abstract: Structural evolution of cuboidal granular media

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Publication details

The article was received on 25 Sep 2011, accepted on 27 Feb 2012 and first published on 14 Mar 2012


Article type: Paper
DOI: 10.1039/C2SM06829J
Citation: Soft Matter, 2012,8, 4795-4801
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    Structural evolution of cuboidal granular media

    R. F. Shepherd, J. C. Conrad, T. Sabuwala, G. G. Gioia and J. A. Lewis, Soft Matter, 2012, 8, 4795
    DOI: 10.1039/C2SM06829J

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