Abstract
We report an experimental investigation by Raman and infrared (IR) absorption spectroscopies on the structural modifications induced by isochronal thermal treatments on amorphous SiO2 nanoparticles (fumed silica). In particular, three different commercial types of this material, characterized by particle mean diameters of 7, 14, and 40 nm, were subjected to thermal treatments from 100 up to 1000 °C. We found that some properties of fumed silica, such as the SiOSi mean bond angle, ring size distribution, and surface adsorbed water content, are drastically different from those of common bulk silica materials and intimately related to the particles’ dimension. The SiOSi mean bond angle, probed by the main Raman line peaked at about 440 cm−1, is modified by thermal treatments above 400 °C and tends toward typical values of bulk silica materials, whereas the three-membered ring population, probed by the D2 line peaked at about 600 cm−1, changes but does not reach bulk silica features. The surface adsorbed wate...
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