Fine and rod-like silica-based mesoporous powders with very short diameter and length have been obtained through (1) the complete dissolution of both sodium metasilicate and cationic surfactants and (2) subsequent rapid pH-adjustment for the formation of silica-surfactant mesophase products.
A synthesis process of spinel Li 4 Ti 5 O 12 (LTO) nanomaterials was investigated using Li + -exchanged titanate nanotubes obtained via hydrothermal synthesis and subsequent reflux treatment. The substituted amount of Li + ions can be controlled by the temperature and time during the reflux treatment in a LiOH aqueous solution, which is the key for the synthesis of single-phase LTO. The rate capability of nanosized LTO as an active material for Li-ion batteries is significantly higher than that of microsized LTO obtained via conventional solid-state synthesis. By changing the intercalated ions during the reflux treatment, this synthesis process can also be applied to the synthesis of other titanate nanomaterials, which are promising active materials for future battery systems.
In this study, morphology control of ZnO was performed by a wet chemical processing without templates at room temperature. In special, the effect of aging time and pH of this wet processing on ZnO morphologies was in detail investigated. As a result, products composed of a single phase of ZnO with a unique morphology like a hollow tube were obtained. Then, it was found that an aging process played an important role on controlling morphology of ZnO during this wet chemical process. Furthermore, it was found that this hollow-tubular ZnO had a high transparency.
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