Rheological investigations on the creaming of depletion-flocculated emulsions

Langmuir : the ACS Journal of Surfaces and Colloids
Simon AbenPeter Schurtenberger

Abstract

Preventing creaming or sedimentation by the addition of thickeners is an important industrial challenge. We study the effect of the addition of a "free" nonadsorbing polymer (xanthan gum) on the stability against creaming of sterically stabilized O/W emulsions. Therefore, we analyze our samples using microscopy and rheological measurements. At low xanthan concentrations, the emulsions cream. However, above a certain concentration a three-dimensional network of droplets is formed, which can prevent creaming. We attribute the formation of this structure to depletion attraction. The rheological behavior of an emulsion that is macroscopically stable should be elastic, while it should be viscous for a creaming emulsion. In order to distinguish between stable and unstable samples, we measure their relaxation time by mechanical rheology and find a good correlation to the visual observation. However, the measured relaxation times are much shorter than the time-scales, on which we observe creaming. We hypothesize that the measured relaxation time is related to the droplet-droplet interaction. This determines the frequency at which microscopic rearrangements occur, which weaken the network structure prior to creaming. Based on this inter...Continue Reading

References

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Citations

Jan 17, 2015·Macromolecular Bioscience·Donghua ZhaoXiaoya Liu
Aug 16, 2019·Journal of Oleo Science·Asami MiyajimaRyo Hyodo
Jan 30, 2021·Langmuir : the ACS Journal of Surfaces and Colloids·Rui CaoAnthony D Dinsmore
Jan 23, 2021·Langmuir : the ACS Journal of Surfaces and Colloids·Jie HouLianfu Zhang
Apr 24, 2018·ACS Applied Materials & Interfaces·Clara Jiménez-SaelicesIsabelle Capron
Jan 9, 2018·Biomacromolecules·Clara Jiménez Saelices, Isabelle Capron
Oct 12, 2021·Analytical Sciences : the International Journal of the Japan Society for Analytical Chemistry·Hideyuki TakezawaTomohiro Uchimura

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