Article ID Journal Published Year Pages File Type
5369968 Applied Surface Science 2006 11 Pages PDF
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 (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 6-9 h leads to an increase in the |ΔSBET/SBET| value to 0.29-0.35 for both treatment methods.
Related Topics
Physical Sciences and Engineering Chemistry Physical and Theoretical Chemistry
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