全氟辛酸钠与十二烷基三甲基溴化铵混合胶束微环境性质的NMR,ESR研究

Studies on the Microenvironment Properties of the Mixed Micelles of SPFO-DTAB by NMR and ESR

应用表面张力法、NMR法和ESR法研究了全氟辛酸钠(SPFO)-十二烷基三甲基溴化铵(DTAB)混合体系水溶液胶束形成及混合胶束的微环境性质(微观粘度、微观极性等).结果表明,碳氟表面活性剂碳氟链和碳氢表面活性剂碳氢链之间具有强烈的相互作用,DTAB与SPFO在水溶液中形成混合胶束.DTAB与SPFO混合体系的表面活性高于单一的DTAB或SPFO,混合体系cmc较单一的DTAB和SPFO低.DTAB与SPFO混合胶束的微观粘度较DTAB胶束的大,而微观极性较DTAB的小.

The sodium perfluorooctanoate(SPFO) - dodecyltrimethylammonium bromide(DTAB) mixed micelles and the mixed micellar microenvironments (microviscosity and micropolarity) were studied by using NMR, ESR and surface tension. The results showed that SPFO and DTAB were capable of forming a mixed micelle in aqueous solution and the fluorocarbon chain of SPFO had strong interaction with the hydrocarbon chain of DTAB. The surface activity of SPFO- DTAB is much higher than SPFO or DTAB itself. The ESR spectra revealed a low polarity and a high viscosity in SPFO- DTAB mixed micellar core, indicating that a number of SPFO fluorocarbon chain had penetrated into the interior of DTAB micelles.