Observation of long-range orientational order in monolayers of polydisperse colloids.
Observation of long-range orientational order in monolayers of polydisperse colloids.
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DOI：
10.1021/la062632q
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发表时间：
2007-01
期刊：
影响因子：
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通讯作者：
Brooks D. Rabideau;L. Pell;R. Bonnecaze;B. Korgel
中科院分区：
文献类型：
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作者：
Brooks D. Rabideau;L. Pell;R. Bonnecaze;B. Korgel
多分散的非晶硅胶体颗粒直径约为10至140纳米，蒸发到碳衬底上。粒子形成紧密排列的单层，其中每个粒子具有6倍六边形晶格的近邻配位特征，但完全缺乏位置顺序。计算了颗粒的取向相关函数，发现在整个聚集体中取向相关函数是恒定的，表明存在长程取向顺序。计算机模拟表明，该体系中的结构组织是由于毛细管浸没力造成的，当颗粒从蒸发的溶剂沉积到基板上时，毛细管浸没力导致了尺寸分离。
Polydisperse amorphous-silicon colloidal particles ranging from approximately 10 to 140 nm in diameter were evaporated onto carbon substrates. The particles formed close-packed monolayers in which each particle had 6-fold nearest-neighbor coordination characteristic of a hexagonal lattice yet completely lacked positional order. Orientational correlation functions were calculated for the particles and found to be constant throughout the aggregate, indicating the occurrence of long-range orientational order. Computer simulations revealed that the structural organization in this system resulted from capillary immersion forces that lead to a size separation as the particles deposit from the evaporating solvent onto the substrate.