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本文介绍了两种图形约化方法,并应用于酶催化反应及链反应的稳态处理,所得结果与文献完全一致。这两种约化方法为复杂反应体系的稳态处理提供了一定的参考价值。 相似文献
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以单晶银纳米方块为液相外延生长晶种的纳米晶形貌可控合成方法 总被引:1,自引:0,他引:1
本文简要综述了以单晶银纳米方块做为可控外延生长的品种来合成各种银纳米晶的相关工作.通过改变银前驱体和晶种颗粒的比例、表面包裹分子及其用量、还原剂浓度、添加欠电位金属阳离子等手段,我们成功地控制了银纳米晶的外延生长方向和裸露晶面,并合成出一系列尺寸、形貌可控的银纳米晶,包括立方体、立方八面体、八面体、八足体、二十四面体、凹面立方八面体和凹面八面体等.除了对合成方法和过程的介绍,本文还简要讨论了每种纳米结构的形成机制. 相似文献
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In this letter, we report a quantitative analysis of how a Pt(Ⅱ) precursor is reduced to atoms at different temperatures for the formation of Pt nanocrystals with different morphologies and sizes. Our results suggest that in the early stage of a synthesis, the Pt(Ⅱ) precursor is reduced to atoms exclusively in the solution phase, followed by homogeneous nucleation to generate nuclei and then seeds. At a relatively low reaction temperature such as 22℃, the growth of the seeds is dominated by autocatalytic surface reduction that involves the adsorption and then reduction of the Pt(Ⅱ) precursor on the surface of the just-formed seeds. This particular growth pathway results in relatively large assemblies of Pt nanocrystals. When the reaction temperature is increased to 100℃, the dominant reduction pathway will be switched from surface to solution phase, producing much smaller assemblies of Pt nanocrystals. Our results also demonstrate that a similar trend applies to the seed-mediated growth of Pt nanocrystals in the presence of Pd nanocubes. 相似文献
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