Journal ArticleDOI
Effect of droplet size on the rheology of emulsions
TLDR
In this article, the effect of droplet size on the rheological behavior of water-in-oil and oilin-water emulsions was investigated using a controlled-stress rheometer.Abstract:
The effect of droplet size on the rheological behavior of water-in-oil and oil-in-water emulsions was investigated using a controlled-stress rheometer. Results indicate that the droplet size has a dramatic influence on emulsion rheology. Fine emulsions (water-in-oil or oil-in-water) have much higher viscosities and storage moduli than the corresponding coarse emulsions. The shear-thinning effect is much stronger in the case of fine emulsions. When coarse droplets are replaced by fine droplets (keeping total volume fraction of the dispersed phase constant), the resulting emulsion exhibits a minimum in rheological properties (viscosity, storage and loss moduli, time constant) at a certain proportion of fine droplets. However, the minimum in viscosity occurs only at low shear stresses. At high stresses, the viscosity of the mixed emulsion increases as the proportion of fine droplets increases. The study of the aging effect on the rheological behavior shows that water-in-oil emulsions age much more rapidly than the oil-in-water emulsions.read more
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Journal ArticleDOI
Demulsification techniques of water-in-oil and oil-in-water emulsions in petroleum industry
Reza Zolfaghari,Ahmadun Fakhru’l-Razi,Luqman Chuah Abdullah,Said S.E.H. Elnashaie,Alireza Pendashteh +4 more
TL;DR: In this article, the most commonly exploited demulsification techniques (i.e., chemical, biological, membrane, electrical, and microwave irradiation) of both oilfield and synthetic emulsions, taking into account the emulsion-stabilizing and -destabilizing effects with regard to the dominant parameters plus the emuls composition are discussed.
Journal ArticleDOI
Rheology of emulsions.
TL;DR: The review is devoted to the historical and modern understanding of rheological properties of emulsions in a broad range of concentration, with special attention to the problem of shear stability of drops of an internal phase starting from the theory of the single drop behaviour.
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Physical and antimicrobial properties of peppermint oil nanoemulsions
TL;DR: The results suggest that the nanoemulsion technology can provide novel applications of essential oils in extending the shelf life of aqueous food products.
Journal ArticleDOI
Rheology of simple and multiple emulsions
TL;DR: In this article, a comprehensive review of the rheology of simple and multiple emulsions is presented, with special attention given to the models describing the RHEology of these systems.
Journal ArticleDOI
Unusually stable liquid foams.
TL;DR: This short review will make a survey of the existing results in the area of stable liquid foams stabilised by surfactants, proteins and particles, and examine the mechanisms at play.