Emulsion stability — kinetics of flocculation and coalescence

Borwankar, Rajendra P.; Lobo, Lloyd; Wasan, Darsh T.

doi:10.1016/0166-6622(92)80224-p

Cited by 80 publications

(64 citation statements)

References 7 publications

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“…Excluding the case of very concentrated emulsions that can create gels (see, e.g., the paper of Solans et al [33]), the kinetic stability of emulsions depends on the interplay between surface forces and Brownian motion [18,[34][35][36][37]. In both cases, the emulsion destabilization can be considered as a combination of an irreversible aggregation and a coalescence of dispersed droplets [12,38] that gives a relevant model for analysis of experimental data.…”

Section: Introductionmentioning

confidence: 99%

Interparticle interactions in concentrate water–oil emulsions

Mishchuk

Sanfeld²,

Steinchen³

2004

Advances in Colloid and Interface Science

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Section: Introductionmentioning

confidence: 99%

Interparticle interactions in concentrate water–oil emulsions

Mishchuk

Sanfeld²,

Steinchen³

2004

Advances in Colloid and Interface Science

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“…Coalescence is not a single stage process but comprises at least four elementary steps, including contact at a distance that allows attractive interaction; the drainage of the continuous phase film between the drops; the rupture of the film; and the collapse of the droplets. The lifetimes of thin films between drops determine the coalescence rate [78]. In the emulsion droplet, coalescence happens in a wide time scale.…”

Section: Coalescencementioning

confidence: 99%

Emulsion liquid membrane for heavy metal removal: An overview on emulsion stabilization and destabilization

Ahmad

Kusumastuti

Chan

et al. 2011

Chemical Engineering Journal

220

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“…Using the equation of Smoluchowski and assuming linear aggregates, he was able to deduce an explicit analytical expression for the total number of aggregates in an emulsion, which depends on a flocculation and a coalescence rate. Borwankar et al deduced a similar average expression for the number of aggregates, considering the coalescence of small flocs [98]. Fitting the theoretical expressions to the experimental data from soybean in water emulsions (φ = 0.…”

Section: Flocculation Of Oil Dropsmentioning

confidence: 99%

Nanoemulsion stability: Experimental evaluation of the flocculation rate from turbidity measurements

Rahn-Chique¹,

Puertas²,

Romero-Cano³

et al. 2012

Advances in Colloid and Interface Science

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The coalescence of liquid drops induces a higher level of complexity compared to the classical studies about the aggregation of solid spheres. Yet, it is commonly believed that most findings on solid dispersions are directly applicable to liquid mixtures. Here, the state of the art in the evaluation of the flocculation rate of these two systems is reviewed. Special emphasis is made on the differences between suspensions and emulsions. In the case of suspensions, the stability ratio is commonly evaluated from the initial slope of the absorbance as a function of time under diffusive and reactive conditions. Puertas and de las Nieves (1997) developed a theoretical approach that allows the determination of the flocculation rate from the variation of the turbidity of a sample as a function of time. Here, suitable modifications of the experimental procedure and the referred theoretical approach are implemented in order to calculate the values of the stability ratio and the flocculation rate corresponding to a dodecane-in-water nanoemulsion stabilized with sodium dodecyl sulfate. Four analytical expressions of the turbidity are tested, basically differing in the optical cross section of the aggregates formed. The first two models consider the processes of: a) aggregation (as described by Smoluchowski) and b) the instantaneous coalescence upon flocculation. The other two models account for the simultaneous occurrence of flocculation and coalescence. The latter reproduce the temporal variation of the turbidity in all cases studied (380 ≤ [NaCl] ≤ 600 mM), providing a method of appraisal of the flocculation rate in nanoemulsions.

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Emulsion stability — kinetics of flocculation and coalescence

Cited by 80 publications

References 7 publications

Interparticle interactions in concentrate water–oil emulsions

Interparticle interactions in concentrate water–oil emulsions

Emulsion liquid membrane for heavy metal removal: An overview on emulsion stabilization and destabilization

Nanoemulsion stability: Experimental evaluation of the flocculation rate from turbidity measurements

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