Structure and dynamics of model colloidal clusters with short-range attractions.

  title={Structure and dynamics of model colloidal clusters with short-range attractions.},
  author={Robert S. Hoy},
  journal={Physical review. E, Statistical, nonlinear, and soft matter physics},
  volume={91 1},
  • R. Hoy
  • Published 15 July 2014
  • Physics
  • Physical review. E, Statistical, nonlinear, and soft matter physics
We examine the structure and dynamics of small isolated N-particle clusters interacting via short-ranged Morse potentials. "Ideally prepared ensembles" obtained via exact enumeration studies of sticky hard-sphere packings serve as reference states allowing us to identify key statistical-geometrical properties and to quantitatively characterize how nonequilibrium ensembles prepared by thermal quenches at different rates T[over ̇] differ from their equilibrium counterparts. Studies of equilibrium… 

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Science 327

  • 560
  • 2010

and C

  • S. O’Hern, Phys. Rev. E 85, 051403
  • 2012

Nanoscale 4

  • 1085
  • 2012

Faraday Discuss

  • 1985

Langmuir 28

  • 16015
  • 2012


  • 103, 4234
  • 1995


  • Rad. Trans. 113, 2482
  • 2012

Choosing rc(α, b)/D = 1 + b(r * − 1), where the attractive force |dUMorse/dr| is maximal at r * /D = (α + log(2))/α, gives c(α, b) = −


    • Rev. Lett. 103, 118303
    • 2009

    For N ≤ 13 systems and the form of UMM described herein, αconv(N ) < 30