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Einfluss der Tropfengröße auf das rheologische Verhalten von Emulsionen

Influence of droplet size in the rheological behavior of emulsions
: Teipel, U.


Chemie- Ingenieur- Technik 73 (2001), No.8, pp.1006-1012
ISSN: 0009-286X
Journal Article
Fraunhofer ICT ()

The average drop diameter of the disperse phase of oil/water and water/oil emulsions is, as a function of emulsification procedure and substances involved 0.1 m x 100 m. In the past, studies were mainly made on the material behavior of emulsions in stationary shear flow vs. the volume concentration of the disperse phase. The material behavior of oil/water emulsions with oscillating shear flow and thus also the viscoelastic substance properties of the emulsions are still largely unexplained. This study had for object the influence of drop size on the flow behavior of emulsions and rheological behavior of emulsions with oscillating shear stress as a function of the drop size. The oil used was paraffin oil of dynamic viscosity 198 mPa-sec at 20°C, density 874.7 kg/cu m, and refractive index 1.48. The continuous phase consisted of water the Tween 85 non-ionic surfactant. Two drop sizes were used, 1 m and 20m. For the same angular frequency, the complex shear module and co mplex viscosity of the 1 m emulsions were higher than for the 20m emulsions.