Nanocomposites with fumed silica/poly(vinyl pyrrolidone) prepared at a low content of solvents

Relaxation phenomena in poly(vinyl alcohol)/fumed silica affected by interfacial water

“…Changes in the Gibbs free energy on PVA adsorption (Fig. 1b) correspond to a typical f ( G) distribution function for polymers (e.g., PVP, PEO, PEG, proteins) adsorbed onto fumed oxides [6,[58][59][60][61]. This result suggests a relatively good distribution of the PVA molecules at the silica surface, which is confirmed by the IR spectra.…”

“…2, curve 1), close to the S BET value of sample I (Table 1). Thus results of these estimates and the IR spectra can be explained by the strong intermolecular interaction between not only PVA and silica but also PVA and PVA molecules, because in the case of the strongest interactions between polymers (e.g., PVP, PEO, PEG) and silica surface, the monolayer coverage results in perturbation of silanols much stronger [6,32,33,[58][59][60][61] than that observed for PVA/silica (Fig. 2, curve 2).…”

“…This band shifts toward lower wavenumbers by 55 cm −1 for water/PVA/fumed silica in comparison with water/fumed silica. It should be noted that in the case of adsorbed PVP or PEO the shape of this band is more symmetric with respect to the individual silica spectrum [60,61]. This displacement can be caused by stronger hydrogen bonding of interfacial water to PVA molecules and surface silanols in comparison with that in the water/silica and PVP or PEO/water/silica systems.…”

Well-defined silica core–poly(vinyl pyrrolidone) shell nanoparticles: Interactions and multi-modal glass transition dynamics at interfaces

“…Previously [52][53][54], a set of silica core-PVP shell nanoparticles were prepared and characterized by different techniques (LTNA, QELS, FT-IR, AFM, modeling). In this paper, we only very briefly report some of these results obtained for particles under study, and then present the new results of the analysis of interfacial interactions and the dynamics of PVP shells.…”

Photochemical stability of poly(vinyl pyrrolidone) in the presence of collagen

“…PVP has been also used for preparation of nanocomposites. Highly disperse nanocomposites with fumed silica/poly(vinyl pyrrolidone) were prepared using different methods [5]. Nanocomposites with highly disperse powders, exfoliated graphite, disperse active carbons and polymers are of interest as prospective materials for biotechnology, medicine and industry.…”