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Slippery diffusion-limited aggregation.

Clair R Seager1, Thomas G Mason

  • 1Department of Physics and Astronomy, University of California-Los Angeles, Los Angeles, California 90095, USA.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|March 16, 2007
PubMed
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Strong, short-range attractions in liquids create "slippery" bonds. Event-driven simulations show these slippery bonds still form fractal clusters via diffusion-limited aggregation (DLA), with unique coordination numbers and structure factors.

Area of Science:

  • Colloid and Surface Science
  • Soft Matter Physics
  • Computational Materials Science

Background:

  • Colloidal particles in liquids can form bonds with varying strengths and ranges.
  • Understanding the aggregation dynamics of particles with secondary attractions is crucial for material design.
  • Diffusion-limited aggregation (DLA) is a fundamental model for cluster formation.

Purpose of the Study:

  • To investigate the aggregation behavior of colloidal particles with strong, short-range, secondary attractions.
  • To determine if fractal clusters form under these
  • slippery
  • bonding conditions.
  • To compare the structural properties of clusters formed via slippery DLA with classic DLA.

Main Methods:

Related Experiment Videos

  • Event-driven simulations of slippery attractive spheres.
  • Analysis of fractal dimension (d_f) and average coordination number (z).
  • Calculation of the structure factor, S(q).

    • Main Results:

    • Space-filling fractal clusters emerge from slippery diffusion-limited aggregation (DLA).
    • Slippery DLA clusters exhibit the same fractal dimension (d_f=2.5) as classic DLA.
    • Significant differences in average coordination numbers (z_S=6 for slippery, z_C=2 for classic).
    • Local tetrahedral jamming leads to distinct structure factor peaks and power-law behavior.

    Conclusions:

    • Slippery attractive interactions do not prevent the formation of fractal clusters.
    • The nature of inter-particle bonding significantly impacts cluster microstructure, even when fractal dimension remains constant.
    • The observed structure factor provides insights into the local ordering and jamming phenomena within slippery clusters.