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Catalytic properties of nanocomposites based on cobalt ferrites dispersed in sol–gel silica

“…This could be related to the densification of the silica matrix (Table 1), and the encapsulation [18] of the ferrite particles. This encapsulation, also observed in previous works [23,24], hinders the access of the gas phase molecules to the ferrite surface and inhibits the catalytic process.…”

Copper−Silica Nanocomposites Tailored by the Sol−Gel Route

“…In particular, the involved mechanisms are strongly dependent on the nature of the copper source as well as on the system microstructure, morphology, and texture, resulting in different evolutions for powders, aerogels, xerogels, and thin films, depending on the preparation route. [15][16][17][18] As a consequence, a detailed comparison between results obtained in different conditions becomes extremely complicated.…”

“…The sequential pathway occurring at molecular or atomic level for the change in copper oxidation state from II in CuO to 0 in metallic Cu is still a current subject of investigation. In particular, the involved mechanisms are strongly dependent on the nature of the copper source as well as on the system microstructure, morphology, and texture, resulting in different evolutions for powders, aerogels, xerogels, and thin films, depending on the preparation route. − As a consequence, a detailed comparison between results obtained in different conditions becomes extremely complicated.…”