Adsorption of polyvinylpyrrolidone and polyoxyethylene by pure and mixed silicon, aluminium and titanium oxides

Adsorption of polyvinylpyrrolidone (PVP) and polyoxyethylene (POE) from the aqueous solutions onto surfaces of individual and mixed silicon, titanium and aluminium oxides was studied. It was found that the values of polymer adsorption depend on composition of oxides. It was shown with IR spectroscopy that the surface of the oxides studied is fully accessible to interaction with PVP and POE

Relaxation Processes of Water Molecules on Surfaces of Highly Dispersed Silica and Titania/Silica

Analyses of dielectric spectra and theoretical simulation results demonstrate that the most probable sites for water cluster adsorption are the B-sites at the TiO 2 /SiO 2 (TS) phase boundary regions and the SiOH groups on the SiO 2 phase in TS. The amount of water on SiO 2 in TS is lower than for pure SiO 2 for the same content of water at the TiO 2 /SiO 2 and SiO 2 surfaces. The energy necessary for the rotation of a water molecule is a maximum for molecules linked via one electron-donor bond M←OH 2 and three hydrogen bonds with other water molecules