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Emulsion Classification Lab Report

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Emulsion Classification
Emulsions may be classified according to the nature of the emulsifier or the structure of the system
Nature of the Emulsifier
Most emulsifiers are non ionic surfactant which is used to emulsify the oil water and water oil emulsion. Furthermore it is also taking part in stabilizing and resistance against coalescence and flocculation. Sodium dodecyl sulfate which is ionic surfactant is also used as emulsifier for specially oil water emulsion, but it needs attention in presence of electrolyte because it is very sensitive. But the surfactant mixture (ionic and non ionic) have their own strength in terms of stabilization of the emulsion. Nonionic polymers can be reffered as polymeric surfactants, but the only difficulty …show more content…

Also these all process takes place simultaneously so it makes difficult for analysis point of view. Model emulsion having mono disperse droplets hence it requires theoretical treatment in order to keep in view the effect of droplet size distribution but these theoretical theories are complex so it can be solved with numerical solutions. Also the polymer and surfactant adsorption on emulsion is not easy therefore one has to get that information from measurement which will be done at plane …show more content…

This aggregation is due to van der waals attraction which is universal with in all disperse systems. Flocculation occurs in that case if there is no enough resistance to keep the droplets a lil apart to some distances when the van der waals forces are weak. Flocculation can be strong or weak in both cases it depend on magnitude of attractive forces involved in it.
3. Ostwald Ripening (Disproportionation)
This process results due to finite solubility of both the liquid phases. Liquids which are immiscible have mutual solubility that is not count far. The emulsions which are polydisperse, have larger solubility because of smaller droplets when it will compared to the larger droplets this all due to curvature effects. After sometime these smaller droplets diffuse into bulk and disappear and deposit on larger droplets. Hence with time the droplet size turn into larger values.
4. Coalescence
This process deals with the disruption and thinning of the liquid film which is developed between the droplets and with time the size of droplets increase because of fusion of two or more droplets. Limiting case in coalescence is the separation of emulsion into two clear liquid phases. The driving force in this process is the film fluctuations or the surface which result due to close approach of droplets on the other hand the van der waal forces are strong which prevent their

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