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

• DOI: 10.1016/j.apsusc.2006.05.065
• Publication Date: 2006-07-12T13:34:59Z
• Authors: V.M. Gun’ko; E.F. Voronin; L.V. Nosach; E.M. Pakhlov; O.E. Voronina; N.V. Guzenko; O.A. Kazakova; R. Leboda; J. Skubiszewska-Z...
• Keywords: Fumed silica; Hydrophobic silica; 2-Pyrrolidone; Vinyl alcohol; Specific surface area

Abstract Highly disperse nanocomposites with fumed silica/poly(vinyl pyrrolidone) (PVP) prepared using different methods were studied by infrared spectroscopy, adsorption, and quantum chemistry methods. Low amounts of water or ethanol (30 wt.% with respect to the silica content) promote appropriate distribution of PVP on silica particles. The use of ethanol leads to a smaller loss of the specific surface area ( S BET ) than in the case of water used as a solvent. On PVP distribution on a silica surface, treatment of the system in a pseudo-liquid state reactor (PLSR) provides slightly better results (a lower loss in S BET ) in comparison with mechanochemical activation (MCA) in a ball mill at the PVP monolayer coverage. An increase in the activation time to 6–9 h leads to an increase in the |Δ S BET / S BET | value to 0.29–0.35 for both treatment methods.