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- ItemEffect of additives on the structure of SiO2 sol-gel spray coatings(Offenbach : Verlag der Deutschen Glastechnischen Gesellschaft, 2000) Löser, Carsten; Rüssel, ChristianSiO2 coatings were prepared from alkoxide sols by means of spray coating. Coatings prepared from sols solely containing ethanol as solvent showed heterogeneous structures. This is supposedly due to solvent evaporation during spray coating. When reaching the substrate, the droplets possess too high viscosity to enable them to disperse on the substrate. However, when additives, such as 1.3-butanediol, ethylene glycol or glycerol, with high boiling temperatures were used, smooth coatings exhibiting small surface roughness were obtained. It is shown that best results were obtained when 1.3-butanediol was used. With increasing additive concentration, the surface roughness decreased.
- ItemTitania, antimony-doped tin oxide and tin-doped indium oxide sol-gel spray coatings(Offenbach : Verlag der Deutschen Glastechnischen Gesellschaft, 2001) Löser, Carsten; Rüssel, ChristianTiO2, antimony-doped dn oxide and tin-doped indium oxide coatings were prepared from sols using a spray coating procedure. Coatings prepared from ethanolic sols exhibited high surface roughness. Adding butanediole to the sols, however, resulted in smooth layers. Supposedly, butanediole prevents the evaporation of high quantities of ethanol from the surface of the droplets initially formed during spraying. The electrical conductivity of the layers formed is in the same range as those of dip coatings.