The experiments show that the middle phase microemulsions can form in tetradecane pyridinium bromide/alcohol/n-heptane/brine systems. The phase behaviour was investigated by using concentration scanning and interfacia...The experiments show that the middle phase microemulsions can form in tetradecane pyridinium bromide/alcohol/n-heptane/brine systems. The phase behaviour was investigated by using concentration scanning and interfacial tension methods. The formation and characteristics of the middle phase microemulsions are affected obviously by the concentrations of TPB from 0.5 % to 6.0 %, the concentrations of n-butanol from 2.0 to 7.0 % and the n-alcohols from C3H7OH to C5H11 OH. The difference between systems with TPB and sodium dodecyl sulfonate (AS) is also discussed. Some rules are worked out.展开更多
This review covers equilibrium and dynamic aspects of surface tension and adsorption,primarily of single non micellar or premicellar and micellar surfactants at the air/water interface.Equilibrium tension data have be...This review covers equilibrium and dynamic aspects of surface tension and adsorption,primarily of single non micellar or premicellar and micellar surfactants at the air/water interface.Equilibrium tension data have been related to the Langmuir adsorption equilibrium isothem and the Gibbs isothem.A minute description of the measurement and the curve analysis of the dynamic surface tension is given.Dynamic adsorption models with the diffusioncontrolled and mixed kinetic mechanisms are discussed in some detail and applied to several sets of data.Apparent diffusion coefficients,inferred from dynamic tension data,and kinetic adsorption parameters,derived from application of the models to the data,are presented and critically evaluated.The adsorption of most of the surfactants examined is slower than predicted by diffusion controlled models.Exceptions are mostly non ionic surfactants and certain alcohols.展开更多
文摘The experiments show that the middle phase microemulsions can form in tetradecane pyridinium bromide/alcohol/n-heptane/brine systems. The phase behaviour was investigated by using concentration scanning and interfacial tension methods. The formation and characteristics of the middle phase microemulsions are affected obviously by the concentrations of TPB from 0.5 % to 6.0 %, the concentrations of n-butanol from 2.0 to 7.0 % and the n-alcohols from C3H7OH to C5H11 OH. The difference between systems with TPB and sodium dodecyl sulfonate (AS) is also discussed. Some rules are worked out.
文摘This review covers equilibrium and dynamic aspects of surface tension and adsorption,primarily of single non micellar or premicellar and micellar surfactants at the air/water interface.Equilibrium tension data have been related to the Langmuir adsorption equilibrium isothem and the Gibbs isothem.A minute description of the measurement and the curve analysis of the dynamic surface tension is given.Dynamic adsorption models with the diffusioncontrolled and mixed kinetic mechanisms are discussed in some detail and applied to several sets of data.Apparent diffusion coefficients,inferred from dynamic tension data,and kinetic adsorption parameters,derived from application of the models to the data,are presented and critically evaluated.The adsorption of most of the surfactants examined is slower than predicted by diffusion controlled models.Exceptions are mostly non ionic surfactants and certain alcohols.
