Disordered spherical bead packs are anisotropic

G.E. Schröder-Turk; W. Mickel; M. Schröter; G.W. Delaney; M. Saadatfar; T.J. Senden; K. Mecke; T. Aste

doi:10.1209/0295-5075/90/34001

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Disordered spherical bead packs are anisotropic

Journal article

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Disordered spherical bead packs are anisotropic

G.E. Schröder-Turk, W. Mickel, M. Schröter, G.W. Delaney, M. Saadatfar, T.J. Senden, K. Mecke and T. Aste

EPL (Europhysics Letters), Vol.90(3)

2010

DOI: https://doi.org/10.1209/0295-5075/90/34001

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Abstract

Investigating how tightly objects pack space is a long-standing problem, with relevance for many disciplines from discrete mathematics to the theory of glasses. Here we report on the fundamental yet so far overlooked geometric property that disordered mono-disperse spherical bead packs have significant local structural anisotropy manifest in the shape of the free space associated with each bead. Jammed disordered packings from several types of experiments and simulations reveal very similar values of the cell anisotropy, showing a linear decrease with packing fraction. Strong deviations from this trend are observed for unjammed configurations and for partially crystalline packings above 64%. These findings suggest an inherent geometrical reason why, in disordered packings, anisotropic shapes can fill space more efficiently than spheres, and have implications for packing effects in non-spherical liquid crystals, foams and structural glasses. PACS numbers: 45.70.-n, 45.70.Cc, 05.65.+b

Details

Title: Disordered spherical bead packs are anisotropic
Authors/Creators: G.E. Schröder-Turk (Author/Creator) - Friedrich-Alexander-Universität Erlangen-Nürnberg
W. Mickel (Author/Creator) - Friedrich-Alexander-Universität Erlangen-Nürnberg
M. Schröter (Author/Creator) - The University of Texas at Austin
G.W. Delaney (Author/Creator) - CSIRO Mathematics, Informatics and Statistics - Private Bag 33, Clayton South, Victoria 3168, Australia
M. Saadatfar (Author/Creator) - Australian National University
T.J. Senden (Author/Creator) - Australian National University
K. Mecke (Author/Creator) - Friedrich-Alexander-Universität Erlangen-Nürnberg
T. Aste (Author/Creator) - Australian National University
Publication Details: EPL (Europhysics Letters), Vol.90(3)
Publisher: Institute of Physics Publishing
Identifiers: 991005545127107891
Murdoch Affiliation: Murdoch University
Language: English
Resource Type: Journal article

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Collaboration types: Domestic collaboration; International collaboration
Citation topics: 7 Engineering & Materials Science; 7.139 Energy & Fuels; 7.139.524 Fluidization
Web Of Science research areas: Physics, Multidisciplinary
ESI research areas: Physics