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首页> 外文期刊>Journal of Materials Research >Mechanisms for species-selective oriented crystal growth at organic templates
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Mechanisms for species-selective oriented crystal growth at organic templates

机译：在有机模板上进行物种选择性定向晶体生长的机制

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Langmuir monolayers floating on supersaturated aqueous subphases can act as templates for the growth of oriented inorganic films—a "bioinspired" nucleation process. We have performed in situ grazing incidence x-ray diffraction studies of the selective nucleation of BaCIF and BaF_2 under fatty acid monolayers. The arrangement of the fatty acid headgroups, the monolayer charge, and ion-specific effects all play important roles in selecting the inorganic species. When the monolayer is in a neutral state, both BaCIF and BaF_2 nucleate at the interface and are well aligned, but when the monolayer headgroup is deprotonated, only oriented BaF_2 grows at the interface. We also observe an enhanced alignment of BaF_2 crystals during growth from highly supersaturated solutions, presumably due to reorganization of preformed crystals at the organic template. These results show that a delicate interplay between multiple factors governs the oriented growth of inorganic films at organic templates.
机译：漂浮在过饱和水亚相上的Langmuir单层膜可以充当定向无机膜生长的模板-一种“生物启发”的成核过程。我们已经对脂肪酸单层下BaCIF和BaF_2的选择性成核进行了原位放牧入射X射线衍射研究。脂肪酸头基的排列，单层电荷和离子特异性效应在选择无机物质中均起重要作用。当单层处于中性状态时，BaCIF和BaF_2都在界面处成核并排列良好，但是当单层头基去质子化时，只有取向的BaF_2在界面处生长。我们还观察到从高度过饱和的溶液生长过程中BaF_2晶体的排列增强，这可能是由于有机模板上预先形成的晶体的重组。这些结果表明，多种因素之间的微妙相互作用决定了有机模板处无机膜的定向生长。

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