以氧化镁和二氧化硅为原料,采用水热法在不同反应时间下合成了一系列纤蛇纹石纳米管.利用X-射线衍射(XRD)、红外光谱(IR)、扫描电镜(SEM)、高分辨透射电镜(TEM)等手段研究了纤蛇纹石晶体生长和晶体结构随反应时间的变化过程.X-射线衍射和红外光谱分析表明:随着反应时间的增加所得到的纤蛇纹石样品结晶逐渐完善、卷曲程度逐渐增大;电镜分析表明:获得的纳米管的外径和内径分别为15～40 nm和6～9 nm,长度为50～300 nm,出现了双层管式结构.根据实验结果,结合负离子多面体配位生长理论对纤蛇纹石的生长机理研究表明,纤蛇纹石是由片状逐渐卷曲成管状的.
A series of chrysotile nanotubes have been synthesized by hydrothermal method using MgO and SiO_2 as raw materials. The samples for different reactive time were characterized by Powder X-ray diffraction(XRD), scanning electron microscopy(SEM), high resolution transmission electron microscopy(HRTEM), infrared spectroscopy(IR). The XRD analysis indicated that the level of layers-curving increase gradually along with longer reactive time.The decreasing trend on the degree of chrysotile crystallinity is revealed by XRD and IR studies, with increasing reactive time. The out diameter、inner diameter and lengths of chrysotile nanotubes are 15-40 nm、6-9 nm and 50-300 nm by the SEM and TEM analysising, respectively.The growth mechanism of layers-curving of the chrysotile nanotubes under hydrothermal conditions is proposed on the basis the results of experiment.
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