Journal ArticleDOI
The rheological and microstructural characterisation of the non-linear flow behaviour of concentrated oil-in-water emulsions
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TLDR
In this paper, experimental observations on the rheology and microstructure of concentrated oil-in-water emulsions stabilised by macromolecular and low-molecular-weight emulsifiers were reported.Abstract:
This paper reports experimental observations on the rheology and microstructure of concentrated oil-in-water emulsions stabilised by macromolecular and low-molecular-weight emulsifiers. From the four different samples that were tested, certain general trends were identified and the measured linear viscoelastic and non-linear viscoelastic properties were compared using a phenomenological factored integral constitutive equation with a continuous relaxation spectrum. The self-consistency of the model was quite good in two cases (vegetable protein and polyoxyethylene glycol non-ionic surfactant emulsifiers) with the general exception of low steady shear rate data where the model overpredicted experimental stress measurements. It is shown that the fitting of the experimental data is sensitive to a wide range of inter-relating factors. In addition, optical observations of the sheared materials consistently showed low shear rate surface slip and this observation was correlated with the rheology miss match. For some systems the optical microstructure studies reveal a range of behaviour for the emulsions dependent on emulsifier composition. Wall slip, microdomain movement, chaining and changes in droplet size distribution were all observed under different conditions and in some cases it has been possible to correlate these microstructure observations with the sample rheology.read more
Citations
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A review of nonlinear oscillatory shear tests: Analysis and application of large amplitude oscillatory shear (LAOS)
Kyu Hyun,Manfred Wilhelm,Christopher O. Klein,Kwang Soo Cho,Jung Gun Nam,Kyung Hyun Ahn,Seung Jong Lee,Randy H. Ewoldt,Gareth H. McKinley +8 more
TL;DR: In this paper, the authors present a review of the typical nonlinear responses observed with complex fluids under LAOS deformations and compare several methods that quantify the nonlinear oscillatory stress response.
Journal ArticleDOI
Large amplitude oscillatory shear as a way to classify the complex fluids
TL;DR: In this article, the large amplitude oscillatory shear (LAOS) behavior was found to be very sensitive to the interactions or the shear-induced formation of microstructures, and it was suggested that the LAOS behavior can be effectively used as a tool for classifying the complex fluids.
Journal ArticleDOI
Large amplitude oscillatory shear behavior of complex fluids investigated by a network model: a guideline for classification
TL;DR: Large amplitude oscillatory shear behavior of complex fluids, which form microstructures depending on their deformation history, has been investigated by using a network model and it is suggested that the LAOS behavior can be effectively used as a tool for classifying complex fluids.
Journal ArticleDOI
Rheological characterization of coloured oil-in-water food emulsions with lutein and phycocyanin added to the oil and aqueous phases
TL;DR: In this paper, the effect of adding natural pigments, lutein and phycocyanin, to the water and oil phases, respectively, of oil-in-water pea protein-stabilized emulsions, beyond the desirable and expected development of a green colour, was studied.
Journal ArticleDOI
Universality in cell mechanics
TL;DR: The cytoskeleton of the adherent living cell is arguably the most complex form of soft matter that exists in nature and conforms to a limited set of empirical laws that appear to be simple and universal.
References
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Journal ArticleDOI
Rheology of foams and highly concentrated emulsions
TL;DR: In this paper, the authors derived expressions for certain rheological properties, such as the stress vs strain relationship, yield stress, and shear modulus, of monodisperse foams and highly concentrated emulsions for the model of infinitely long cylindrical drops.
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Analysis of time-dependent non-linear stress-growth data for shear and elongational flow of a low-density branched polyethylene melt
TL;DR: In this paper, a single integral constitutive equation is presented, which gives a reasonable description of the non-linear shear and elongational behavior of a low-density branched polyethylene melt at constant strain rate observed by Meissner.
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Fundamental principles of emulsion rheology and their applications
TL;DR: In this article, a review of the factors that affect the flow characteristics (rheology) of emulsions is presented, including the volume fraction of the dispersal phase, the viscosity of the disperse droplets, the droplet size distribution, the viscous and chemical composition (pH, electrolyte concentration, etc.) of the medium, the interfacial rheology of the emulsifier film and the concentration and nature of the imulsifier.
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Viscosity/Concentration Relationships for Emulsions
Rajinder Pal,E. Rhodes +1 more
TL;DR: In this article, the authors developed equations to describe the viscosity/concentration behavior of Newtonian and non-Newtonian emulsions having dispersed phase concentrations less than 74% by volume.