title: Effect of temperature on pseudoternary system Tween-80-butanol-hexane-water.
abstract: Phase diagrams of pseudoternary systems of Tween-80, butanol, hexane and water were constructed by a visual titration method. The cloud points (CPs) at various compositions were determined and the variations in the cloud points were analyzed on the basis of changes in the composition of the different components in the microemulsions. A quantitative model was established by using multiple regression analysis considering weight percent of emulsifier (surfactant+cosurfactant) and oil as independent variables. A lowering in the CP with increase in emulsifier content and decrease in oil content was observed. Addition of sodium chloride also depressed the CP significantly. Further, with the increase in temperature the turbid phase started separating to three different transparent zones. The upper layer was recognized as the oil-rich phase, middle layer was due to microemulsion and the lower layer was found to be a micellar system. Metal ions and colored organic substrates partitioned into these different phases, which provides scope for applications in metal ion preconcentration.
authors.affiliation: Centre for Studies in Surface Science and Technology, School of Chemistry, Sambalpur University, Jyoti Vihar 768 019, India.
authors.forename: Partha
authors.initials: P
authors.lastname: Mukherjee
authors.forename: Susanta Kumar
authors.initials: SK
authors.lastname: Padhan
authors.forename: Sukalyan
authors.initials: S
authors.lastname: Dash
authors.forename: Sabita
authors.initials: S
authors.lastname: Patel
authors.forename: Prasanta Kumar
authors.initials: PK
authors.lastname: Mohapatra
authors.forename: Bijay Kumar
authors.initials: BK
authors.lastname: Mishra