Tuning the face orientation of ZnO nano/microcrystals by a wet chemical method

We successfully synthesize four kinds of ZnO nano/microcrystals including dumbbell microrods, nanoflakes, nanoplates, and microrods by a simple wet chemical method. Growth duration is found to play a crucial role in the morphologies of these ZnO nano/microcrystallites. In addition, growth conditions are systematically studied as a function of precursor concentration and temperature. The structural and optical characteristics of the ZnO samples are further investigated by X-ray diffraction, scanning electron microscopy, and photoluminescence spectroscopy.

碱活化改性高岭土/NR复合材料的结构和性能研究

采用凝聚共沉法制备碱活化改性高岭土／NR复合材料，并对其物理性能和微观结构进行研究。结果表明，高岭土改性时间为3d、改性高岭土与天然胶乳混合温度为45℃、改性高岭土用量为40份时，碱活化改性高岭土／NR复合材料的综合物理性能较好；改性高岭土在NR基体中发生了定向排列，基本上以面-面平行状态均匀分散，大部分高岭土以厚度为25-75nm的层叠形式平行分布在NR基体中；改性高岭土与NR基体间形成过渡层。