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Gravity induced formation of concentration gradients in supersaturated binary solutions

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  • Izmailov, Alexander F.
  • Myerson, Allan S.

Abstract

Experimental and theoretical studies of the formation of solute concentration gradient in supersaturated binary solutions in a gravitational field were carried out. The formation of solute concentration gradient was associated with the gravity induced redistribution of subcritical solute clusters. The birth-death process of the new solute-rich phase domains (subcritical solute clusters) was described in terms of the time-dependent Ginzburg-Landau model developed for metastable state relaxation in binary (solute + solvent) non-critical solutions in the presence of a gravitational field. A new mathematical Ansatz was developed for solution of the model equations. This Ansatz has allowed to approach for the first time the following important problems:1.(A) Microstructure of solute distribution inside of the subcritical solute clusters. The analytical results obtained demonstrate that solute inside of the subcritical solute clusters is heterogeneously distributed with a spatially periodic structure.2.(B) Macrostructure of the solute subcritical clusters distribution in a gravitational field. The subcritical solute clusters are found to be distributed heterogeneously in a gravitational field.

Suggested Citation

  • Izmailov, Alexander F. & Myerson, Allan S., 1996. "Gravity induced formation of concentration gradients in supersaturated binary solutions," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 224(3), pages 503-532.
    • Handle: RePEc:eee:phsmap:v:224:y:1996:i:3:p:503-532
    DOI: 10.1016/0378-4371(94)00299-1
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    1. Izmailov, Alexander F. & Myerson, Allan S., 1993. "Theory of metastable state relaxation for non-critical binary systems with non-conserved order parameter," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 192(1), pages 85-106.
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