Phase behaviour of microemulsions: Derivation of expressions for the natural radius and for the interfacial tension between microemulsion and the excess dispersed phase

✍ Scribed by E. Ruckenstein

• Publisher: Elsevier Science
• Year: 1985
• Tongue: English
• Weight: 421 KB
• Volume: 118
• Category: Article
• ISSN: 0009-2614
• DOI: 10.1016/0009-2614(85)85406-3

✦ Synopsis

An equation is proposed Ior the intaIacial tenston CJ between a microcmulsion and the excess dlspcrscd phase. relaring this quantity to other measurable quantities such as the radms of lhe globules r and their volume kaction 9. Thrs eqwtion is obtained by subtracting rrom tie interracial tension y at rhc s~r:ace of Ihe globules Ihe energy c due 10 the bending of the inlerfacral layer of surfacrant and cosutfaclanl. Thermodynamic considerations. which are based on micro and macro length scales. along WIIII an expression for the entropy of dispersion of the globules in Ihe conlinuous phase provide a relation for y as a function of r and 9. The same thermodynamic wnuderations are used to develop a procedure IO calculate rhe narura: radius of the sufactant layer which m tut-n allows one LO calculate L III tm of r and +_ In COIIICE.~ IO previous approaches prop-c-3 for the crJcuIation of c. the natural radius is no longer an empirical parameter but a quantity which naturally nriscs as a reult of Ihe thermodynamic catwderations.