The influence of interfacial viscoelasticity on droplet deformation in microchannels

Zhao, Chun-Xia, Rondeau, Elisabeth, Miller, Erik, Cooper-White, Justin J., Dexter, Annette F. and Middelberg, Anton P.J. (2009). The influence of interfacial viscoelasticity on droplet deformation in microchannels. In: WCCE8: 8th World Congress of Chemical Engineering, Montréal, QC, Canada, (1-2). 23-27 August 2009.

Author Zhao, Chun-Xia
Rondeau, Elisabeth
Miller, Erik
Cooper-White, Justin J.
Dexter, Annette F.
Middelberg, Anton P.J.
Title of paper The influence of interfacial viscoelasticity on droplet deformation in microchannels
Conference name WCCE8: 8th World Congress of Chemical Engineering
Conference location Montréal, QC, Canada
Conference dates 23-27 August 2009
Publication Year 2009
Sub-type Oral presentation
Start page 1
End page 2
Total pages 2
Language eng
Formatted Abstract/Summary
Peptides have recently attracted considerable attention as novel self-assembling materials, particularly stimuli-responsive materials. Two peptide surfactants (AM1 and AFD4) able to reversibly and precisely control the stability of emulsions have been designed in our laboratory (Dexter, Malcolm et al. 2006; Malcolm, Dexter et al. 2006; Dexter and Middelberg 2007). Emulsion stabilization by these two peptide surfactants involves the formation of a cohesive, mechanically-strong interfacial film, by non-covalent cross-linking of interfacially-adsorbed peptide molecules via metal ions. Switching between the film and non-film states can be achieved in situ by the addition of chelating agent or acid to the bulk solution. In this work, microfluidic devices are used as a tool for the fundamental study of film-stabilized emulsion droplets in defined hydrodynamic shear flows. The role of the viscoelastic interfacial network on droplet deformation is investigated. This microfluidic approach allows precise control of droplet formation as well as droplet deformation under controlled extensional flow, allowing the shape of droplets to be continuously recorded using optical microscopy. To distinguish the role of interfacial viscoelasticity from effects due to interfacial tension, the deformation of droplets in the film (zinc cross-linked) and non-film (EDTA mobilized) states was compared. This study provides direct insight into the effect of a viscoelastic interfacial film, formed from high molecular weight surfactants, on emulsion stability and flow behavior.
Subjects 0904 Chemical Engineering
Keyword Interfacial viscoelasticity
Droplet deformation
Extensional flow
Microfluidic devices
Q-Index Code EX
Q-Index Status Provisional Code
Institutional Status Unknown
Additional Notes Presented during Session EE3: "Emulsion and Emulsification 3" as Paper 02103.

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Created: Thu, 07 Oct 2010, 14:35:24 EST by Jon Swabey on behalf of Aust Institute for Bioengineering & Nanotechnology