1998/10/27 by Luca Falconi, Marco Maccarini, Falconi, Luca +7
Chemistry · Physics and Astronomy · #Adsorption, diffusion, and thermodynamic properties of materials #Biological Physics (physics.bio-ph) #Chemical Physics (physics.chem-ph) #Electrostatics and Colloid Interactions #FOS: Physical sciences #Surfactants and Colloidal Systems #physics.bio-ph #physics.chem-ph
paper · pdf · doi:10.48550/arxiv.physics/9810056
12 pages, 8 figures, elsart style, submitted to Colloids and Surfaces
arxiv created 1998/10/27 · openalex publication_date 1998/10/27 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
By means of density, dielectric spectroscopy and sound velocity measurements we perform a systematic study on the polyoxyethylene C12E6 nonionic surfactant solutions as a function of temperature and concentration. Both density and sound velocity data, at about 34∘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.