Analysis of the Surfactant Effect on Detachment of a Droplet in Immiscible Fluid Phase

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Hassanisaber, Hamid | 2010

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 40252 (06)
University: Sharif University of Technology
Department: Chemical and Petroleum Engineering
Advisor(s): Roostaazad, Reza
Abstract:
The phenomenon of oil drop detachment from solid surface has great importance in many different industries, such as coating, print, membrane emulsification, detergency, and oil enhancement recovery. In our study, we tried to explore this phenomenon. Therefore, we attempted to employ Young equation as force balance for the discussed system which is comprised of n-Decane as oil droplet, aqueous solution (brine) with SDS (Sodium Dodecyl Sulfate), and glass. Also, in order to find governing factors regarding oil detachment process -such as interfacial tension, contact angle, and line friction coefficient- we used an advanced apparatus equipped with horizontal microscope and digital video camera. The result of our observation shows that line friction coefficient is a notable physicochemical parameter in the oil drop detachment process from solid surface in brine. Furthermore, we observed that with a rise of surfactant concentration in brine the relevant line friction coefficient would decrease, and this is parallel with a decrease in time period needed for reaching equilibrium of contact angle and contact line reduction.
Keywords:
Drops (Liquids) ; Drop Detachment ; Surfactants ; Line Friction Coefficient ; Young Equation