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首页> 外文期刊>Nanotechnology >Systematical study of depositing nanoparticles and nanowires in mesoporous silica using supercritical carbon dioxide and co-solvents: Morphology control, thermodynamics and kinetics of adsorption
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Systematical study of depositing nanoparticles and nanowires in mesoporous silica using supercritical carbon dioxide and co-solvents: Morphology control, thermodynamics and kinetics of adsorption

机译：使用超临界二氧化碳和助溶剂在中孔二氧化硅中沉积纳米颗粒和纳米线的系统研究：形态控制，吸附的热力学和动力学

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AgNO _3 was successfully deposited into mesoporous silica including SBA-15 and KIT-6 using supercritical carbon dioxide as the solvent, ethanol or a mixture of ethanol and ethylene glycol as the co-solvent, followed by calcination after depressurization. A large number of experiments were conducted to find out the most important parameters influencing the metal loading and the morphology of the nanostructure. The morphology was found to vary a lot according to the deposition time, which is interesting, i.e.small nanoparticles, short nanorods, continuous nanowires, and big nanoparticles appeared in succession as the deposition time increased. Besides, the co-solvent was also found to influence significantly the deposition results. The samples prepared using the mixture of ethanol and ethylene glycol as the co-solvent presented the morphology of nanowires, while those prepared using only ethanol as the co-solvent presented a mixed morphology of both nanoparticles and nanowires. The role of ethylene glycol was discussed and a mechanism model demonstrating the formation of Ag nanowires or nanoparticles was proposed. Finally, the adsorption of AgNO _3 (adsorbate) from supercritical carbon dioxide and co-solvent (solvent) on the SBA-15 support (adsorbent) was investigated by both experimental and simulating methods. It was found that the adsorption isotherm was well fitted by the Langmuir model, and the kinetic investigation based on a mass differential equation showed that the adsorption reached equilibrium after 10000s (about 2.8h) which was consistent with our experimental result (2.5h).
机译：使用超临界二氧化碳作为溶剂，乙醇或乙醇和乙二醇的混合物作为共溶剂，将AgNO_3成功沉积到包括SBA-15和KIT-6的介孔二氧化硅中，然后在减压后煅烧。进行了大量实验以找出影响金属负载量和纳米结构形态的最重要参数。发现形态根据沉积时间而变化很大，这是有趣的，即随着沉积时间的增加，小纳米颗粒，短纳米棒，连续纳米线和大纳米颗粒相继出现。此外，还发现助溶剂会显着影响沉积结果。使用乙醇和乙二醇混合物作为共溶剂制备的样品呈现出纳米线的形态，而仅使用乙醇作为共溶剂制备的样品呈现出纳米线和纳米线的混合形貌。讨论了乙二醇的作用，并提出了证明银纳米线或纳米颗粒形成的机理模型。最后，通过实验和模拟方法研究了超临界二氧化碳和助溶剂（溶剂）对AgNO_3（吸附物）的吸附在SBA-15载体（吸附剂）上。结果表明，吸附等温线与Langmuir模型拟合得很好，基于质量微分方程的动力学研究表明，吸附在10000s（约2.8h）后达到平衡，这与我们的实验结果（2.5h）一致。

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