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Colloidal hard-sphere crystallization kinetics in microgravity and normal gravity.

Z Cheng, J Zhu, W B Russel

    Applied Optics
    |March 25, 2008
    PubMed
    Summary
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    Colloidal hard-sphere crystallization kinetics were studied. Gravity suppressed crystal coarsening, while microgravity accelerated crystal growth, indicating face-centered-cubic is the stable structure.

    Area of Science:

    • Condensed matter physics
    • Colloidal science
    • Crystallization dynamics

    Background:

    • The hard-sphere disorder-order transition is a fundamental model for crystallization.
    • Understanding crystallization kinetics is crucial for materials science and condensed matter physics.

    Purpose of the Study:

    • To investigate the kinetics of nucleation and growth in colloidal hard-sphere crystals.
    • To elucidate the role of gravity in the crystallization process.

    Main Methods:

    • Time-resolved Bragg light scattering was employed to monitor nucleation and growth.
    • Experiments were conducted in both microgravity and normal gravity conditions for comparison.

    Main Results:

    • Crystallites grew faster and larger in microgravity compared to normal gravity.

    Related Experiment Videos

  • Gravity was observed to suppress the coarsening of crystallites.
  • The face-centered-cubic (FCC) structure was identified as the stable crystal structure for hard spheres.
  • A volume fraction of 0.552 followed the classic nucleation and growth model.

    • Conclusions:

    • Gravity significantly influences colloidal crystallization, suppressing coarsening and affecting growth rates.
    • The face-centered-cubic structure is confirmed as the thermodynamically stable phase for hard-sphere systems.
    • The findings provide insights into the fundamental mechanisms of crystallization in colloidal systems.