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ygb7086

金虫 (小有名气)

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结合实验现象,我们认为可能的形成机理过程可分为两步:晶核形成和晶体生长。在晶核形成过程中,小颗粒聚集形成大颗粒。然后在生长过程中,小颗粒通过SSS机理可能沿两个方向生长。当在反应体系中加入表面活性剂(PVP﹑TX-100﹑PEG600)时,晶体的生长速率可能不同。当生长速率过低时,中间部分可能组合在一起而形成棒。一旦加入表面活性剂,整个体系的生长速率差不多相同,再加上由于Sb-S原子链的各项异性,在不同的溶剂中就可合成尺寸均一的纳米棒或者纳米纤维。所以整体上看起来就分别像蝴蝶结﹑稻草束﹑花状﹑薄片﹑空心球。其更加精确的形成机理有待进一步研究。

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wendyyang11

金虫 (正式写手)

ygb7086(金币+25, 翻译EPI+1): 2010-04-02 10:48
Based on the experimental phenomena, we believe that the formation mechanism of the process may be divided into two steps: nucleation and crystal growth. In the nucleation process, small particles aggregate to form larger particles. Then in the growth process, small particles through the SSS mechanism may grow along two directions.When the reaction system by adding surfactant (PVP﹑TX-100﹑PEG600), the crystal growth rate may be different. When the growth rate is too low, the middle part may be formed together into a rod . Once the addition of surfactant,the entire system is almost the same growth rate, coupled with Sb-S atomic chain because of the opposite sex, in different solvents can be synthesized in the same size of uniform nanorods or nanofibers. So were a whole looks like a bowknot﹑a bundle of straw bow ﹑flower﹑ sheet﹑hollow spere. The more precise formation mechanism needs further study.
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