化学组成对纤蛇纹石纳米管水热生长的影响

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The influence of molar ratio of SiO2 and MgO on the synthesis of ehrysotile nano-tubes was investigated. A series of chrysotile samples were synthesized from activated MgO and amorphous SiO2 by hydrothermal-reaction at different ratio ofn（SiO2） ： n（MgO）, X-ray diffraction, infra-red spectrometry, scanning electronic microscope and transmission electronic microscope were used to analyze the chrysotile samples. The resuits showed that the rate of formation of nano-tubes was determined by the rato value ofn （SiO2） ： n （MgO）. It was found that the tubed-stucture was easy to form, the erystallinity of chrysotile increased and its configuration becomed more clear as ratio value ofn （SiO2） ： n （MgO） reduced. As the ratio value of n（SiO2） ： n（MgO） was 0.68, the inner diameter for the chrysotile nano-tubes and the outer ones was 6-8 run and 30-40 nm and a length above 600 nm which was superior to other studies.以SiO2和MgO为原料，研究了原料化学组成对纤蛇纹石纳米管生长的影响。采用水热法在不同n（SiO2）：n（MgO）比下合成了系列纤蛇纹石样品，利用X射线衍射（XRD）、红外光谱（FTIR）、扫描电镜（SEM）和透射电镜（TEM）对合成样品进行结构和形貌表征。结果表明：n（SiO2）：n（MgO）比偏离0．68不利于纤蛇纹石结构的生长；在n（SiO2）：n（MgO）比为0．68时，能够合成内径约为6～8nm、外径约30～40nm、长度多在600nm以上的纤蛇纹石纳米管。