Silicon oxide coatings experimental

Thompson and Carol (1995) have experimentally studied texture evolution in Ag thin films and have shown that the competition between strain energy minimization and surface energy minimization leads to film textures that are consistent with the transition predicted by (1.32). Figure 1.38 shows their experimental results on texture evolution in Ag polycrystalline thin films of different thicknesses as a function of temperature excursion AT from the deposition temperature. Here, the Ag films were deposited on MgO(lOO) substrates coated with amorphous silicon oxide. The solid line in this figure denotes the texture transition condition predicted by (1.32). 

This review is concerned with organosilanes and therefore purely inorganic Si/O/H species are not considered. Nevertheless, because of the importance of silane oxidation and of oxidized silicon coatings there is considerable interest and activity in this area. Four theoretical papers25,80-82 have been published concerning stabilities of the potentially important molecules in these processes. Needless to say there are very few experimental data in the area under consideration. 

Finally, finely divided hydrous oxides of iron, aluminum, manganese, and silicon are the dominant sorbents in nature because they are common in soils and rivers, where they tend to coat other particles. This is the reason why numerous laboratory researchers have been studying the uptake of trace elements by adsorption on hydrous oxides (Dzomback and Morel, 1990). Partition coefficients (concentration in solid/concentration in the solution) for a number of trace elements and a great variety of surfaces have been determined. The comparison of these experimental with natural values should give information on the nature of the material on which trace elements adsorb in namral systems and allow quantitative modeling. 

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