Journal article
Factors affecting the stability of foamed concentrated emulsions
Colloids and Surfaces A: Physicochemical and Engineering Aspects, Vol.150(1-3), pp.171-184
1999
Abstract
This paper attempts to quantify the stability of three-phase systems generated by aerating concentrated water-in-oil emulsions. In such materials, which we call foamed emulsions, the continuous phase is itself a two-phase system. In this work, we modify and extend the method originally proposed by Iglesias et al. (Colloids and Surfaces A, 98 (1995) 167-174) to viscous three-phase foams. The modified method involves imparting a destabilising force to the sample to make the foam short-lived and measuring the change in height as a function of decay time. The change of height during decay represents the rate at which gas is evolved from the foamed emulsion and is logarithmic with time. The data treatment yields two values, the decay constant and half-life, which are used as a means of measuring and comparing stability. Two distinct decay mechanisms (smooth decay and catastrophic collapse) operate in foamed emulsions that are subjected to oscillations. For a given decay mechanism, the decay constant is an intrinsic property of the foamed emulsion and is independent of the imposed oscillations. Experimental results indicate that different bubble stabilising surfactants and emulsion morphology significantly affect the foam stability, and that the stability is inversely related to the initial expansion. Examination of the gas-emulsion interface shows a segregation of droplets, with smaller droplets found preferentially at the gas-emulsion interface.
Details
- Title
- Factors affecting the stability of foamed concentrated emulsions
- Authors/Creators
- D. Turner (Author/Creator) - University of Newcastle AustraliaB. Dlugogorski (Author/Creator) - University of Newcastle AustraliaT. Palmer (Author/Creator) - Orica Australia Pty, George Booth Drive, Kurri Kurri, NSW 2327, Australia
- Publication Details
- Colloids and Surfaces A: Physicochemical and Engineering Aspects, Vol.150(1-3), pp.171-184
- Publisher
- Elsevier BV
- Identifiers
- 991005540453307891
- Copyright
- © 1999 Elsevier Science B.V.
- Murdoch Affiliation
- Murdoch University
- Language
- English
- Resource Type
- Journal article
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- Collaboration types
- Industry collaboration
- Domestic collaboration
- Citation topics
- 2 Chemistry
- 2.190 Surfactants, Lipid Bilayers & Antimicrobial Peptides
- 2.190.215 Critical Micelle Concentration
- Web Of Science research areas
- Chemistry, Physical
- ESI research areas
- Chemistry