Abstract:

The structural parameters of microemulstions composed of P507(K)-alcohol(pentanol, hexanol, iso-pentanol,2-ethyl butanol-1) were calculated based on sphere model and dilution method. The structural parameters include irmer water radius R_w, effective radius of particle R_e, length of interface l, average aggergation number n, total number of particles N_d and total interfacial area of dispersed phase A_d. The results show that R_w has linear relationship with ω (the molax ratio of water to surfactant). According to the intercept, the water solvation thickness of the polar head of P507(K) was calculated to be about 0.58 nm. The maximum numbers of water molecules associating with K~+ in pentanol, hexanol, isopentanol and 2-ethyl butanol-1 containing microemulsions were estimated to be about 5.83, 5.31, 4.95 and 4.28, respectively.

Key words: Microemulsion, Dilution method, Sphere model