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I. Creaming Behavior by Pretima Manoj; Annette J. Fillery-Travis; Andrew D. Watson; David J. Hibberd; Margaret M. Robins is a Chemistry article available to read on EtoBox.

What is I. Creaming Behavior about?

We report an experimental investigation on the creaming behavior of flocculated, polydisperse, oil-in-water emulsions. Flocculation is by addition of a depletion flocculant, the polymer hydroxyethylcellulose (HEC), at a range of concentrations. The creaming behavior is dependent on the oil volume fraction and polymer concentration. At low concentrations of HEC, the droplets cream either individually or in two populations, a flocculated phase, and a coexistent phase of individual droplets. At higher HEC concentrations, the droplets appear to cream as a single entity, with a sharp lower boundary, separating the region with droplets from a clear serum at the base of the container. In these emulsions, and in some of the coexistent ones, there is a significant delay before creaming starts. Once started they cream at a constant rate. We have identified the continuous phase viscosity as a major factor. The aim of this work is to elucidate the mechanisms underlying the delay before creaming. We propose that as soon as they flocculate, the emulsions form space-filling structures, which slowly rearrange until channels are formed that allow the flow of bulk continuous phase to the base of the

Who reads I. Creaming Behavior?

Author

Pretima Manoj; Annette J. Fillery-Travis; Andrew D. Watson; David J. Hibberd; Margaret M. Robins

Publisher

Elsevier Science; Elsevier ; Elsevier Inc.; Elsevier BV (ISSN 0021-9797)

Published

1998

Language

EN

Field

Chemistry (Physical Sciences)