Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5369968 | Applied Surface Science | 2006 | 11 Pages |
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 (30Â 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 (SBET) 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 SBET) in comparison with mechanochemical activation (MCA) in a ball mill at the PVP monolayer coverage. An increase in the activation time to 6-9Â h leads to an increase in the |ÎSBET/SBET| value to 0.29-0.35 for both treatment methods.
Keywords
Related Topics
Physical Sciences and Engineering
Chemistry
Physical and Theoretical Chemistry
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-ZiÄba,