Conformational analysis of nonionic surfactants by FT-Raman spectroscopy measurements

A conformational analysis of ethylene oxide and methylene chains for the mi xtures of nonionic surfactant (polyethyleneglycol mono n-dodecyl ether, C12 EOn, n = 5 similar to 8) with pure water was carried out by FT-Raman spectr oscopy measurements to clarify the relationship between the conformation of the methylene or ethylene oxide chain and the aggregate for C12EOn in the pure water. The trans conformation for C-C bond in the hydrophilic ethylene oxide chain in liquid crystalline phase was less than that in aqueous mice llar solution and pure C12EOn. On the other hand, the order of the hydropho bic methylene chain decreased with increasing concentration of C12EOn.