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Recently, the research team led by Researcher Zhu Qingshan from the Institute of Process Engineering, Chinese Academy of Sciences, has developed a precursor - hydrolysis method, achieving the batch - scale synthesis of silica multi - shell hollow microsphere powder, and the relevant research results have been published in Advanced Materials.
Silica multi - shell hollow microsphere powder has a high specific surface area, low density, and excellent chemical stability, showing potential application value in fields such as industrial catalysis and pharmaceutical carriers. However, its traditional preparation method, the template method, is costly and difficult to produce on a large scale.
Based on fluidization technology, the team led by Zhu Qingshan prepared a diimino - silicon - containing precursor through the ammonia - decomposition method of silicon tetrachloride. The precursor was hydrolyzed in ammonia water at 25℃ for 5 hours and then dried at 60℃, and thus the micron - scale silica multi - shell hollow microsphere powder could be obtained. This method omits the processes of template preparation and high - temperature etching, and can be used to synthesize kilogram - level products. The synthesis efficiency is increased by two orders of magnitude compared with the traditional method, and the cost is reduced by one order of magnitude.In addition, this method can regulate the cavity size of the microsphere powder by changing the composition of the hydrolysis medium. Through the ammonium chloride deposition - pyrolysis strategy, the pore size can be adjusted in the range of 2nm - 50nm. Meanwhile, this method can also be used to synthesize tin oxide and titanium dioxide hollow microsphere powders.