Analyses in Interfacial Rheology - Drop Shape Analyzer

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Emulsions and foams are constantly in motion during production or transport. The interfaces of droplets or bubbles are stretched during these processes. How such deformations impact on the stability of food and bodycare products or influence the yield in tertiary crude oil production depends on how the surface tension or interfacial tension (SFT/IFT) responds to the stretching. Interfacial rheology measurements with the Drop Shape Analyzer – DSA30R provide the key to answering this question.

The measuring principle involves evaluating video images of drops or gas bubbles at a dosing needle to measure the surface or interfacial tension. The interface size is sinusoidally changed during this process. The SFT/IFT is measured as a function of the surface change and is also sinusoidal in the case of samples containing surfactants.

Tasks and applications
  • Emulsions and foams for food or body care
  • Flooding mixtures and foam in enhanced oil recovery
  • Demulsifiers
  • Defoamers and antifoamers
  • Surfactant research
Measurement options
  • Measurement of interfacial rheological parameters such as the elastic modulus E’ and viscous modulus E’’
  • Analysis of oscillating pendant or rising drops in a gaseous and liquid surrounding phase
  • Measurements on oscillating gas bubbles
  • Static surface and interfacial tension
  • Measurement at temperatures ranging from -10 to 70 °C