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Author index ►Anne Pitkowski, Taco Nicolai, Dominique Durand

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Shear flow and large amplitude oscillation shear study of solutions of aggregating micellar casein particles

Appl. Rheol.18:2 (2008) 23050 (7 pages) ►

Small micellar casein particles were formed in aqueous solutions of native casein after addition of polyphosphate. These socalled submicelles aggregated and gelled with a rate that increased with increasing temperature.The evolution of the viscosity during this process was determined at constant shear rate or shear stress. When applying a small shear stress the viscosity increased strongly until the shear rate became immeasurably slow, but when the applied shear stress exceeded a critical value (σ_{c}) the aggregates broke up and the viscosity reached a maximum. At longer times the viscosity decreased rapidly at first, followed by a very slow decrease. sc was independent of the shear rate and heating temperature, but increased strongly with increasing casein concentration.At constant shear rate the stress remained close to σ_{c}, but fluctuated irregularly.After cessation of shear flow, gels were formed rapidly. Oscillation shear measurements for σ > σ_{c}showed a strongly non-linear response at the time of maximum viscosity.► Cite this publication as follows:

Pitkowski A, Nicolai T, Durand D: Shear flow and large amplitude oscillation shear study of solutions of aggregating micellar casein particles, Appl. Rheol. 18 (2008) 23050.

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