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Computer simulation study of phase separation in a binary mixture with a glass-forming component

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  • Sappelt, Dirk
  • Jäckle, Josef

Abstract

We present a computer simulation study of spinodal decomposition with one of the two phases freezing in a glassy state during phase separation. As a model we used the Cahn-Hilliard equation with a concentration-dependent mobility coefficient which decreases rapidly with increasing concentration of the glass-forming component. We solved the Cahn-Hilliard equation numerically for two dimensions. The domain growth depends crucially on the volume fraction of the glassy phase. For high volume fractions, when the glassy phase forms a percolating matrix, a novel coarsening mechanism is discovered, which arises from the migration and coalescence of liquid droplets within the glassy matrix. Various quantities characterizing the time-dependent domain pattern, like droplet size distribution, one- and two-point distribution function and structure factor of the concentration field, are computed. We checked the validity of the dynamic scaling hypothesis.

Suggested Citation

  • Sappelt, Dirk & Jäckle, Josef, 1997. "Computer simulation study of phase separation in a binary mixture with a glass-forming component," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 240(3), pages 453-479.
    • Handle: RePEc:eee:phsmap:v:240:y:1997:i:3:p:453-479
    DOI: 10.1016/S0378-4371(97)00048-4
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