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R. Brummer
6th DGK Workshop Rheology of Cosmetic Emulsions. 25 Years of Rheology at Beiersdorf

Appl. Rheol. 21:2 (2011) 126-128

Cite this publication as follows:
Brummer R: 6th DGK Workshop Rheology of Cosmetic Emulsions. 25 Years of Rheology at Beiersdorf, Appl. Rheol. 21 (2011) 126.

Katarzyna Niedzwiedz, Oliver Arnolds, Norbert Willenbacher, Rudiger Brummer
Capillary Breakup Extensional Rheometry of Yield Stress Fluids

Appl. Rheol. 19:4 (2009) 41969 (10 pages)

Filament breakup of high viscosity fluids with apparent yield stress has been investigated and strategies for an appropriate characterization of their behavior in CaBER experiments are discussed. Filament profiles of such fluids exhibit significant concave curvature. Accurate determination of filament shape is mandatory for understanding deformation behavior. Therefore, we have set up an optical train including high-speed camera, telecentric objective and telecentric back-light illumination with a blue light emitting diode (LED) providing high contrast filament shape imaging. Image analysis allows for diameter determination with an accuracy of 3.55 μm/pixel. In addition to the transient filament diameter at the neck we have extracted the curvature at this point as a function of time and the region of deformation, in order to characterize the extensional flow behavior.We have investigated the time evolution of filament shape as a function of various experimental parameters like stretching time, velocity profile during stretching, stretching ratio and initial sample volume at constant stretching ratio. Filament thinning is independent of stretching time, tsub>s and stretching velocity profile. But when the same stretching ratio is applied at different initial volume fraction, filament curvature increases strongly with decreasing sample volume leading to an increase of filament life time according to the negative contribution of its curvature to the Laplace pressure inside the fluid.

Cite this publication as follows:
Niedzwiedz K, Arnolds O, Willenbacher N, Brummer R: Capillary Breakup Extensional Rheometry of Yield Stress Fluids, Appl. Rheol. 19 (2009) 41969.

F. Hetzel, J. Nielsen, S. Wiesner, R. Brummer
Dynamic mechanical freezing points of cosmetic O/W emulsions and their stability at low temperatures

Appl. Rheol. 10:3 (2000) 114-118

Cite this publication as follows:
Hetzel F, Nielsen J, Wiesner S, Brummer R: Dynamic mechanical freezing points of cosmetic O/W emulsions and their stability at low temperatures, Appl. Rheol. 10 (2000) 114.

Rudiger Brummer
The rheology of cosmetic emulsions (DGK)

Appl. Rheol. 9:6 (1999) 272-273

Cite this publication as follows:
Brummer R: The rheology of cosmetic emulsions (DGK), Appl. Rheol. 9 (1999) 272.

R. Brummer, F. Hetzel, C. Harder
Correlation of Polymer Properties with Dynamic Mechanical Measurements

Appl. Rheol. 7:4 (1997) 173

Cite this publication as follows:
Brummer R, Hetzel F, Harder C: Correlation of Polymer Properties with Dynamic Mechanical Measurements, Appl. Rheol. 7 (1997) 173.

G Hamer, R Brummer
Rheological Methods to Characterize Cosmetics

Appl. Rheol. 7:1 (1997) 19

Cite this publication as follows:
Hamer G, Brummer R: Rheological Methods to Characterize Cosmetics, Appl. Rheol. 7 (1997) 19.


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