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Water Assisted Growth of C60 Rods and Tubes by Liquid–Liquid Interfacial Precipitation Method

机译:液-液界面沉淀法水辅助生长的C60棒材和管材

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摘要

C60 nanorods with hexagonal cross sections are grown using a static liquid–liquid interfacial precipitation method in a system of C60/m-dichlorobenzene solution and ethanol. Adding water to the ethanol phase leads instead to C60 tubes where both length and diameter of the C60 tubes can be controlled by the water content in the ethanol. Based on our observations we find that the diameter of the rods/tubes strongly depends on the nucleation step. We propose a liquid-liquid interface growth model of C60 rods and tubes based on the diffusion rate of the good C60 containing solvent into the poor solvent as well as on the size of the crystal seeds formed at the interface between the two solvents. The grown rods and tubes exhibit a hexagonal solvate crystal structure with m-dichlorobenzene solvent molecules incorporated into the crystal structure, independent of the water content. An annealing step at 200 °C at a pressure <1 kPa transforms the grown structures into a solvent-free face centered cubic structure. Both the hexagonal and the face centered cubic structures are very stable and neither morphology nor structure shows any signs of degradation after three months of storage.
机译:使用静态液-液界面沉淀法在C60 /间二氯苯溶液和乙醇体系中生长具有六边形截面的C60纳米棒。相反,将水添加到乙醇相中会导致C60管,C60管的长度和直径都可以通过乙醇中的水含量来控制。根据我们的观察,我们发现棒/管的直径很大程度上取决于成核步骤。我们基于良好的含C60的溶剂向不良溶剂中的扩散速率以及在两种溶剂之间的界面处形成的晶种的大小,提出了C60棒和管的液-液界面生长模型。生长的棒和管显示出六方溶剂化物晶体结构,其中间二氯苯溶剂分子结合到晶体结构中,而与水含量无关。在200°C且压力小于1 kPa的退火步骤将生长的结构转变为无溶剂的面心立方结构。六角形和面心立方结构都非常稳定,在储存三个月后,形态和结构均未显示任何降解迹象。

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