The Change of Alcohol Amount on the Interface and Its Effect on the Structure of P507(K)/Alcohol/n-Heptane/Water Microemulsion
SHEN Xing-Hai, GAO Hong-Cheng
1996, 17(3):
464-466.
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The maximum solubilization of water (Smax) at various total amounts of alcohol(Vn) in P507(K)/alcohol (n-propanol,isopropanol,n-butanol,2-butanol,n-pentanol,2-pentanol,n-hexanol,3-hexanol,sec-octyl alcohol)/n-heptane/water microemulsions was investigated.Different trends of the change of Smax against Va were found.In the n-pentanol,2-hutanol,2-pentanol,3-hexanol and sec-octyl alcohol containing systems, Smax firstly increases and then becomes very low rapidly.This phenomenon was interpreted in terms of the formation of molecular solutions.It was also found that Smax firstly increases with Va and then remains unchanged in the n-propanol-containing system, while Smax increases rapidly at first and then increases gradually in the isopropanol-containing system.It was suggested that Rw, radius of water pool, is unchanged when Smax remains the same value in the former syxtem.In the latter system,Rw was also supposed to be unchnged when Smax begins to increase gradually,however,the detergentless microemulsion forms at the same time.In the n-hexanol-containing system,there exists a peak in the Smax vs.Va curve.It shows that there is a maximum value of I,molar ratio of alcohol to surfactant on the interface,in the system.
