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| 在晶体的成核和生长过程中，反应温度，时间，溶剂以及表面活性剂对其尺寸和形貌有着重要影响。当用1,2-丙二醇做溶剂温度低于150 ℃，用乙二醇，1,4-丁二醇，1,6-己二醇做溶剂，温度低于186 ℃而其他相应的条件不变时仅仅得到聚集的无定形硫化锑纳米粒子。在实验中，四种溶剂具有不同的表面性能，作为反应介质，它对反应物的溶解性，反应活性，分散性有重要影响。为什么在不同的溶剂中合成的硫化锑形貌不同，其原因尚不清楚，但是我们认为溶剂的极性，粘度等影响了最终产品的形貌。 |
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4楼2010-04-04 09:15:35
sammi_deng
金虫 (正式写手)
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xiangshang(金币+15, 翻译EPI+1): 2010-04-04 08:54
| In the crystal nucleation and growth process, the reaction temperature, time, solvent and surface active agents have an important impact on their size and shape. When using 1,2 - propanediol as the solvent at temperatures which is below 150 ℃, with ethylene glycol, 1,4 - butanediol, 1,6 - hexanediol as solvents, meanwhile any other corresponding conditions are unchanged but the temperature reduces to below 186 ℃, we only get the amorphous antimony sulfide nanoparticles. In the experiment, four solvents have defferent surface properties. When they are used as the reaction medium, they will have a crucial effect on its reactant solubility, reactivity as well as dispersion. The reasons why the morphology of antimony sulfide are different in different solvents are still not clear. However, we still believe that the solvent polarity,viscosity and so on will impact the morphology of the final producets. |
2楼2010-04-02 11:01:23
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sirljz(金币+1):欢迎新虫，禁止直接用工具翻译的帖子 2010-04-04 12:10
sirljz(金币+1):欢迎新虫，禁止直接用工具翻译的帖子 2010-04-04 12:10
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Experimental conditions, including temperature, time, solvent and surfactant may stress important effects on the sizes and morphologies of a given crystal by participating in the nucleation and growth, in which many overall factors integrate to dominate the process. The reaction temperature is important for the formation of Sb2S3. When the temperature is lower than 150 ℃ in 1,2-propanediol and 186 ℃ in ethylene glycol or 1,4-butanediol or 1,6-hexanediol , with the other conditions remaining unchanged, only aggregated amorphous Sb2S3 particles were observed. To investigate the possible growth mechanism of Sb2S3, time-dependent experiments, which exhibit Amorphous particles, were also carried out. In our case, four solvents with different characterizations, which can influence the solubility, reactivity, and diffusion behavior of the reactants, are used as reaction media.The reason why different morphologies formed in different solvents is still unknown, although we think the polarity and viscosity of the solvents may affect morphologies of the final products. It is well known that the presence of surfactants can influence the crystal growth, and different surfactants with different physical and chemical properties can influence the solubility, reactivity, and diffusion behavior of the reactants, in particular, the polarity and coordinating ability of the surfactants can influence the crystal morphology of the final product |
3楼2010-04-04 08:56:59