Authors
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Dutschk, V. ; Chen, J. ; Petzold, G. ; Vogel, R. ; Clausse, D. ; Ravera, F. ; Liggieri, L.
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Title
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The role of emulsifier in stabilization of emulsions containing colloidal alumina particles
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Date
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05.11.2012
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Number
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30627
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Abstract
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This paper focuses on the study on rheological behaviour of emulsions, stabilized by both differently modified dispersible colloidal Boehmite alumina nanoparticles and a non-ionic emulsifier. Hysteresis loop measurements and dynamic rheological measurements were carried out in linear and non-linear regimes on two different emulsion systems water-in-oil (W/O) and oil-in-water (O/W) emulsions.<br />Emulsion stabilized by a combination of moderately hydrophobic particles and a non-ionic emulsifier is an O/W emulsion. The addition of emulsifier improved the stability, however, did not show a significant influence on the emulsion flow behaviour. The emulsion, stabilized by both nanoparticles and emulsifier showed a complicated behaviour, i.e. sometimes it exhibited thixotropy or antithixotropy and sometimes both of them.<br />Emulsion stabilized by rather hydrophobic particles and a non-polar emulsifier is a W/O emulsion. The emulsion is very homogenous and exhibited very weak thixotropy. Dynamic measurements showed that G was almost equal to G and both parameters were frequency-dependent, indicating a viscous liquid-like system with little network structure if any. With addition of emulsifier, the rather elastic solid-like emulsion structure may be changed into the viscous liquid-like structure.<br />In order to get a better understanding of relationships between rheological behaviour and microstructure, differential scanning calorimetry (DSC) results and optical microscopic images of the emulsions studied were discussed.
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Publisher
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Colloids and Surfaces A: Physicochemical and Engineering Aspects
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Wikidata
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Citation
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Colloids and Surfaces A: Physicochemical and Engineering Aspects 413 (2012) 239-247
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DOI
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https://doi.org/10.1016/j.colsurfa.2012.01.026
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