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Related Experiment Videos

Defoaming effect of calcium soap.

Hui Zhang1, Clarence A Miller, Peter R Garrett

  • 1Department of Chemical Engineering, Rice University, Houston, TX 77251-1892, USA.

Journal of Colloid and Interface Science
|October 7, 2004
PubMed
Summary

Calcium oleate destabilizes foam by altering surfactant films and particle bridging. Foam stability depends on calcium oleate precipitation, with aged solutions showing increased stability.

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Area of Science:

  • Colloid and Surface Science
  • Surfactant Chemistry
  • Foam Stabilization/Destabilization

Background:

  • Foam stability is critical in various industrial processes.
  • Calcium oleate is a common additive with complex effects on foam.
  • Understanding its interaction with anionic and nonionic surfactants is essential.

Purpose of the Study:

  • To investigate the impact of calcium oleate on foam stability in anionic and nonionic surfactant solutions.
  • To elucidate the mechanisms by which calcium oleate affects foam.
  • To develop a model predicting calcium oleate precipitation in surfactant solutions.

Main Methods:

  • Experimental study of foam stability in aqueous surfactant solutions with varying calcium oleate concentrations.
  • Analysis of foam destabilization mechanisms, including monolayer incorporation and particle bridging.
  • Development and validation of a simplified model for predicting sodium oleate precipitation.

Main Results:

  • Calcium oleate destabilizes foams by incorporating into surfactant monolayers and bridging films, particularly in freshly prepared solutions.
  • Foam stability increased with aging time as calcium oleate precipitation neared completion, despite increased turbidity.
  • Nonionic surfactant foams were less stable than anionic ones but also destabilized by calcium oleate.

Conclusions:

  • Calcium oleate's defoaming action involves multiple mechanisms dependent on solution conditions and aging.
  • Precipitation kinetics of calcium oleate significantly influence foam stability.
  • The developed model accurately predicts precipitation onset, aiding in foam control strategies.

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