Small angle neutron scattering study of two nonionic surfactants in water micellar solutions

摘要

Two classic nonionic surfactants a€“ C14E7 (heptaethylene glycol monotetra-decyl ether) and C10E7 (heptaethylene glycol monodecyl ether) were investigated in heavy water solution for concentration e?‘? = 0.17% (dilute regime) at different temperatures in the range e?‘? = 10a€“35?°C by small angle neutron scattering (SANS) method. In the case of C14E7 surfactant a€“ for all temperatures at e?‘? = 0.17% there are two axial ellipsoidal micelles with longer axis 15 nm at 10?°C and 49.5 nm at 35?°C in investigated solutions. For C10E7 surfactant at the same concentration of solution and temperature a€“ two axial ellipsoidal micelles were observed, too. The longer axis is equal to 7.5 nm at 10?°C, 9 nm at 20?°C and at 35?°C this axis is equal to 12 nm. Micelles of C10E7 nonionic surfactant are smaller than those of C14E7 surfactant in the same experimental conditions.