Korea-Australia Rheology Journal

The Korean Society of Rheology (한국유변학회)
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Droplet deformability and emulsion rheology: steady and dynamic behavior

  • Saiki Yasushi (Ian Wark Research Institute, The ARC Special Research Centre for Particle and Material Interfaces, University of South Australia) ;
  • Prestidge Clive A. (Ian Wark Research Institute, The ARC Special Research Centre for Particle and Material Interfaces, University of South Australia)
  • Published : 2005.12.01
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Abstract

The static and dynamic rheological behavior of concentrated sodium dodecylsulfate (SDS) stabilized, deformability controllable polydimethylsiloxane (PDMS) emulsions is reported and comparisons made with silica (hard sphere) suspensions. Steady-mode measurements indicate 'hard' (viscoelastic) droplets behave as hard spheres, while 'soft' (viscous) droplets induce structural flexibility of the emulsion against shear. Dynamic-mode measurements reveal that viscoelasticity of droplets provides the great magnitude of elasticity for the 'hard' emulsion, while formation of planar films between droplets is the origin of the elasticity of 'soft' emulsions. Combination of steady and dynamic rheological behavior has enabled depiction of droplet structure evolution in relation to the shear stress applied, especially by taking advantage of the normal force that reflects the transient deformation of droplets.

Keywords

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