Physics – Chemical Physics
Scientific paper
1998-10-27
Physics
Chemical Physics
12 pages, 8 figures, elsart style, submitted to Colloids and Surfaces
Scientific paper
By means of density, dielectric spectroscopy and sound velocity measurements we perform a systematic study on the polyoxyethylene $C_{12}E_{6}$ nonionic surfactant solutions as a function of temperature and concentration. Both density and sound velocity data, at about $34^{\circ}C$, coincide with the value obtained for pure water. Above this temperature the density is lower than the water density whereas below it is greater, the opposite happens for the compressibility. Combining results from these different techniques we tempt a very detailed description of the evolution of the micellar interfacial properties with temperature. It is well known that nonionic surfactant solutions dehydrate, growing temperature. Our results indicate that this process is associated with a continuous change in the polymer conformation and in the local density of the micellar interface.
Briganti Giuseppe
D'Arrigo Giovanni
Falconi Luca
Maccarini Marco
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