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以活性MgO和纳米SiO2为原料,在仿地质作用的碱性水热环境下控制不同反应参数合成了多个系列的纤蛇纹石样品。利用XRD和IR分析系统地研究了不同反应参数对纤蛇纹石特征的影响。结果表明,活性MgO和纳米SiO2在水热环境中很容易转变成纤蛇纹石相,但形成完善纳米管结构须严格控制水热反应条件;pH值、反应温度和反应时间的提高均有利于水热合成结晶度及管状结构更加完善的纤蛇纹石,最佳水热反应条件为pH=13.8,200℃,反应60h,此条件下无其它杂质产物生成,合成温度较前人采用的300℃有所降低。利用SEM和AFM对最佳反应条件下合成的纤蛇纹石纳米管的形貌进行了观察,发现其为短柱状,准直性较高,表面光洁无杂质,直径均一,约50nm,长度多为400～500nm。
Using active MgO and nano-SiO2 as raw materials, a series of chrysotile samples were synthesized under different geochemical hydrothermal conditions under different geological conditions. The effects of different reaction parameters on the chrysotile characteristics were systematically investigated by XRD and IR analysis. The results show that active MgO and nano-SiO2 are easily converted into chiral serpentine phase in hydrothermal environment, but the conditions of hydrothermal reaction should be strictly controlled to form perfect nanotube structure. The improvement of pH value, reaction temperature and reaction time are all favorable Hydrothermal synthesis of chrysotile with better crystallinity and tubular structure. The optimal hydrothermal reaction conditions were pH = 13.8, 200 ℃, reaction time 60h, no other impurity products were formed under this condition, the synthesis temperature was 300 ℃ decreased. The morphology of chrysotile nanotube synthesized under the optimal reaction conditions was observed by SEM and AFM. The results showed that the chiral serpentine nanotubes were short columnar with high collimation, smooth surface without impurities, uniform diameter, about 50nm and length For 400 ~ 500nm.