Droplet coalescence near liquid/liquid critical points

Randy D. Hazlett, Robert S. Schechter

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)


The state of matter within a fluid layer near a critical point differs profoundly in many aspects from states further removed from the critical point. The interfacial tension tends to vanish, the interface thickens, and long-range concentration fluctuations exist. Because of these effects, critical phenomena have been investigated as possible sources of instability in thin films. Shear-field coalescence studies have been performed between phases of a simple ternary system containing no surfactant as a function of distance from a critical point. The coalescence efficiency was measured as a function of temperature through time dependent photomicrographic analysis of emulsion samples within a shear-field coalescence cell. The apparatus, procedure, and analysis are outlined. No evidence was found for the promotion of coalescence by critical phenomena for values of reduced temperature, Tr = (T - Tc)/Tc, down to 4×10-4.

Original languageEnglish
Pages (from-to)71-87
Number of pages17
JournalColloids and Surfaces
Issue number1
Publication statusPublished - 1988
Externally publishedYes

ASJC Scopus subject areas

  • General Engineering


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