Investigation of the stability of microemulsion in extraction organic phase of saponated P507

The activation energy ΔE can indicate the strength of the interfacial membranes of microemulsion particles, so it could be used to discribe and discuss the stability of the formed microemulsion in extraction organic phase- Variations of activation energies with water content for microemulsions forme...The activation energy Delta E can indicate the strength of the interfacial membranes of microemulsion particles, so it could be used to discribe and discuss the stability of the formed microemulsion in extraction organic phase. Variations of activation energies with water content for microemulsions formed in the organic phase of saponated P507 (2-ethylhexylphosphonic acid mono-2-ethylhexyl ester)-alcohol (n-propanol, n-butanol, n-pentanol and n-hexanol)-heptane-water were determined by measurement of electric conductivity. The curves between Delta E and water content V-H2O were given. It is found that Delta E of butanol system decreases slightly with the increase of water content, while that of pentanol and hexanol systems presents a maximum. It is also found that the activation energy increases with the increase of the length of alcohol chain. These results reveal that the longer the length of alcohol chain, the bigger the strength of the interfacial membranes of particles, and the more stable the microemulsion is. Based on the above results, hexanol or octanol was always used as co-surfactant in extraction process.http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:A1997XP29000006&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=8e1609b174ce4e31116a60747a720701SCI(E)中文核心期刊要目总览(PKU)中国科学引文数据库(CSCD)105685-6871