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    Phonon dispersion and elastic moduli of two-dimensional disordered colloidal packings of soft particles with frictional interactions

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    Genre
    Journal Article
    Date
    2014-01-03
    Author
    Still, T
    Goodrich, CP
    Chen, K
    Yunker, PJ
    Schoenholz, S
    Liu, AJ
    Yodh, AG
    Subject
    cond-mat.soft
    cond-mat.soft
    Permanent link to this record
    http://hdl.handle.net/20.500.12613/5898
    
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    DOI
    10.1103/PhysRevE.89.012301
    Abstract
    Particle tracking and displacement covariance matrix techniques are employed to investigate the phonon dispersion relations of two-dimensional colloidal glasses composed of soft, thermoresponsive microgel particles whose temperature-sensitive size permits in situ variation of particle packing fraction. Bulk, B, and shear, G, moduli of the colloidal glasses are extracted from the dispersion relations as a function of packing fraction, and variation of the ratio G/B with packing fraction is found to agree quantitatively with predictions for jammed packings of frictional soft particles. In addition, G and B individually agree with numerical predictions for frictional particles. This remarkable level of agreement enabled us to extract an energy scale for the interparticle interaction from the individual elastic constants and to derive an approximate estimate for the interparticle friction coefficient. © 2014 American Physical Society.
    Citation to related work
    American Physical Society (APS)
    Has part
    Physical Review E - Statistical, Nonlinear, and Soft Matter Physics
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    ae974a485f413a2113503eed53cd6c53
    http://dx.doi.org/10.34944/dspace/5880
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