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首页> 外文期刊>Powder Technology: An International Journal on the Science and Technology of Wet and Dry Particulate Systems >Morphological and structural features of individual and composite nanooxides with alumina, silica, and titania in powders and aqueous suspensions
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Morphological and structural features of individual and composite nanooxides with alumina, silica, and titania in powders and aqueous suspensions

机译：粉末和水性悬浮液中含氧化铝，二氧化硅和二氧化钛的单个和复合纳米氧化物的形态和结构特征

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摘要

Morphological, structural, and adsorptive characteristics of such fumed oxides as alumina, silica, composite silica/alumina and alumina/silica/titania were studied using a variety of experimental methods. Heating of nanooxides caused several processes resulting in the temperature dependent structural changes of the materials because of changes in the amounts of intact and dissociatively adsorbed water not only at the surface of the nanoparticles but also in their volume that lead to changes in the oxide matrix structure. These processes dependent on the composition of nanooxides are much stronger for nanosilica than for alumina or composite oxides. The morphology of primary nanoparticles is more stable on different treatments than the structure of secondary and ternary particles. The amounts of water adsorbed onto the nanooxides from air correspond to the amounts of water strongly bound (unfrozen at T<273 K) to the oxide surfaces in aqueous suspensions.
机译：使用多种实验方法研究了氧化铝，二氧化硅，复合二氧化硅/氧化铝和氧化铝/二氧化硅/二氧化钛等气相氧化物的形态，结构和吸附特性。纳米氧化物的加热导致多种过程，导致材料的温度依赖性结构变化，这是因为不仅在纳米颗粒表面而且在其体积中完整的水和解离吸附的水量发生变化，导致氧化物基质结构发生变化。取决于纳米氧化物组成的这些过程对于纳米二氧化硅比对氧化铝或复合氧化物强得多。在不同处理下，初级纳米粒子的形态比次级和三级粒子的结构更稳定。从空气中吸附到纳米氧化物上的水量相当于在水性悬浮液中牢固结合（在T <273 K时未冻结）到氧化物表面的水量。

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