Hydrodynamic model for drying emulsions

Huanhuan Feng Huanhuan, J.H.B. Sprakel, J. van der Gucht

Research output: Contribution to journalArticleAcademicpeer-review

6 Citations (Scopus)

Abstract

We present a hydrodynamic model for film formation in a dense oil-in-water emulsion under a unidirectional drying stress. Water flow through the plateau borders towards the drying end leads to the buildup of a pressure gradient. When the local pressure exceeds the critical disjoining pressure, the water films between droplets break and the droplets coalesce. We show that, depending on the critical pressure and the evaporation rate, the coalescence can occur in two distinct modes. At low critical pressures and low evaporation rates, coalescence occurs throughout the sample, whereas at high critical pressures and high evaporation rate, coalescence occurs only at the front. In the latter case, an oil layer develops on top of the film, which acts as a diffusive barrier and slows down film formation. Our findings, which are summarized in a state diagram for film formation, are in agreement with recent experimental findings.
Original languageEnglish
Article number023011
Number of pages8
JournalPhysical Review. E, Statistical nonlinear, and soft matter physics
Volume92
DOIs
Publication statusPublished - 2015

Keywords

  • latex film formation
  • atomic-force microscopy
  • foam drainage
  • phase inversion
  • coalescence
  • dynamics
  • surfactant
  • stability
  • fracture

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