Emulsions stability, from dilute to dense emulsions — Role of drops deformation

Sanfeld, Albert; Steinchen, Annie

doi:10.1016/j.cis.2007.12.005

Cited by 46 publications

(39 citation statements)

References 269 publications

(466 reference statements)

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“…However, there is no simple connection between emulsion stability and interfacial rheology. Sanfeld and Steinchen concluded that within a given range of parameters, a film's elasticity gives a negligible contribution to its emulsion stability (52). On the other hand, Maldonado-Valderama et al demonstrated a connection between the interfacial elasticity and coalescence in emulsions stabilised with b-casein (49).…”

Section: Stability Of Gas-liquid and Liquid-liquid Interfaces: Interfmentioning

confidence: 99%

Interfacial rheology: An overview of measuring techniques and its role in dispersions and electrospinning

Pelipenko¹,

Kristl²,

Rošic³

et al. 2012

Acta Pharmaceutica

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Colloidal disperse systems represent the increasing number of modern delivery systems whose primary characteristic, a large interfacial area, causes thermodynamic instability. Therefore, the foremost challenge in dispersion design is the reduction of interface instability and an understanding of the behaviour of interfaces. Interfacial rheology is one of the most powerful tools for observing occurrences at the interphase. As previously mentioned, the stability of such systems is provided by the formation of a stable interfacial layer of surfactants around each dispersible particle. The stability of these systems can be improved by using more than one surfactant, but it must be kept in mind that different surfactants can have varying mechanisms of stabilisation, some of which can be mutually incompatible. Surfactant selection is therefore crucial and must be based on physicochemical properties, stability of the interfacial film, mobility of the molecules in the interfacial film, HLB, film formation kinetics, compatibility and interactions between molecules on the surface, CMC, etc. Interfacial rheological properties have yet to be thoroughly explored. Only recently, methods have been introduced that provide sufficient sensitivity to reliably determine viscoelastic interfacial properties. In general, interfacial rheology describes the relationship between the deformation of an interface and the stresses exerted on it.Due to the variety in deformations of the interfacial layer (shear and expansions or compressions), the field of interfacial rheology is divided into the subcategories of shear and dilatational rheology. While shear rheology is primarily linked to the long-term stability of dispersions, dilatational rheology provides information regarding short-term stability. Interfacial rheological characteristics become relevant in systems with large interfacial areas, such as emulsions and foams, and in processes that lead to a large increase in the interfacial area, such as electrospinning of nanofibers.

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Section: Stability Of Gas-liquid and Liquid-liquid Interfaces: Interfmentioning

confidence: 99%

Interfacial rheology: An overview of measuring techniques and its role in dispersions and electrospinning

Pelipenko¹,

Kristl²,

Rošic³

et al. 2012

Acta Pharmaceutica

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Section: Introductionmentioning

confidence: 99%

“…The emulsion formation, stability and rheology are widely studied in relation to emulsion applications in petroleum industry, coating, food, cosmetics, pharmacy, and other technological areas [1][2][3][4][5][6][7][8][9][10]. In most of these studies, the researchers analyze the main factors affecting the stability of oil-in-water (O/W) emulsions during emulsification [5][6][7][8] and upon shelf-storage [9,10], as the emulsions of this type are most common in practice. The important role in emulsion stabilization of the van der Waals, electrostatic, steric (due to adsorbed polymers), depletion, capillary (due to adsorbed solid particles) and other types of surface forces has been revealed and explained [4,9,[11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

“…In most of these studies, the researchers analyze the main factors affecting the stability of oil-in-water (O/W) emulsions during emulsification [5][6][7][8] and upon shelf-storage [9,10], as the emulsions of this type are most common in practice. The important role in emulsion stabilization of the van der Waals, electrostatic, steric (due to adsorbed polymers), depletion, capillary (due to adsorbed solid particles) and other types of surface forces has been revealed and explained [4,9,[11][12][13][14]. In other studies, the formation of viscoelastic adsorption layers, e.g.…”

Section: Introductionmentioning

confidence: 99%

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Factors affecting the stability of water-oil-water emulsion films

Politova

Denkov

2017

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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“…The phenomenon of film thinning between drops suspended in an immiscible liquid has been investigated in hydrodynamic and buoyant forces driven configurations [5] in which it represents the time-determining step of the whole coalescence process [6] and has a great impact on emulsions stability [7]. Different analytical expressions have thus been established depending on the nature and behavior of the interfaces.…”

Section: Introductionmentioning

confidence: 99%

Electrocoalescence of water drops in oil shear flow: Development of an experimental set up

Raisin

Reboud

Atten

2011

2011 IEEE International Conference on Dielectric Liquids

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Present research aims at determining the conditions leading to electrocoalescence of water drops in oil flows and at characterizing the interplay between fluid dynamics and electric field in the mechanism. We describe here the build-up of an experimental setup designed to investigate the critical coalescence conditions in the case of two free water droplets in an oil shear flow under the action of an applied electric field. Drop pairs will be injected in a Poiseuille flow to study, by optical means, their relative motion, deformation and possible coalescence. Important part of this preliminary work concerns the injection of controlled charge free drop pairs using a newly developed EHD actuation technique. Second paper [1] deals with theoretical and numerical analyses in the same configuration.

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Emulsions stability, from dilute to dense emulsions — Role of drops deformation

Cited by 46 publications

References 269 publications

Interfacial rheology: An overview of measuring techniques and its role in dispersions and electrospinning

Interfacial rheology: An overview of measuring techniques and its role in dispersions and electrospinning

Factors affecting the stability of water-oil-water emulsion films

Electrocoalescence of water drops in oil shear flow: Development of an experimental set up

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