An Analysis on Multi-Step-Growth of Oil Droplets Dispersed in Water

Sakai, Toshio; Abe, Masahiko; Momozawa, Nobuyuki

doi:10.5650/jos.52.681

Cited by 4 publications

(1 citation statement)

References 11 publications

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“…Using DLS, Sakai et al [68] observed that the radii of benzene droplets dispersed in water increase in a geometrical series with a common ratio of (V/3V o ) 1/3 , where V is the total volume of the emulsion (V = V w + V o ), and V i is the volume of phase i. This result was explained supposing a multi-step-growth model which assumes that primary droplets first aggregate into a cluster, and then merge (coalesce) making a secondary droplet.…”

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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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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Surfactant-free emulsions

Sakai

2008

Current Opinion in Colloid & Interface Science

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Colloidal Stability of Emulsifier-free Water-in-Oil Emulsions: Effect of Oil Property

俊郎

桂太

2014

Journal of the Japan Society of Colour Material

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The colloidal stability of emulsifier-free water-in-oil (EF-W/O) emulsions prepared by ultrasonic emulsification was examined to evaluate the mechanism of the colloidal stabilization of water droplets dispersed in organic media. We found that the colloidal stability of paraffinbased EF-W/O emulsions became higher with longer hydrocarbon chain of paraffin (Hexane < Octane < Decane < Dodecane < Tetradecane < Hexadecane as a continuous phase). Furthermore, we revealed that the vegetable oil (Soybean, Corn and Olive oil)-based EF-W/O emulsions were much more stable than the paraffin-based EF-W/O emulsions. These results indicate that the colloidal stability of EF-W/O emulsions is attributed to the oil property. In particular, the colloidal stability of EF-W/O emulsions is strongly affected by density difference between oil (as a continuous phase) and water (as a dispersed phase) and viscosity of oil (as a continuous phase).

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An Analysis on Multi-Step-Growth of Oil Droplets Dispersed in Water

Cited by 4 publications

References 11 publications

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

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

Surfactant-free emulsions

Colloidal Stability of Emulsifier-free Water-in-Oil Emulsions: Effect of Oil Property

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