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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
Xu, QQ; Wang, Q; 王雅琼;Wang, AQ; Yin, JZ; Yu-Liu
2012
发表期刊NANOTECHNOLOGY
卷号23期号:28页码:285602
摘要AgNO3 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 AgNO3 (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 10 000 s (about 2.8 h) which was consistent with our experimental result (2.5 h).
学科领域Science & Technology - Other Topics; Materials Science; Physics
DOI10.1088/0957-4484/23/28/285602
收录类别SCI
WOS记录号WOS:000305972600006
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被引频次:10[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ihep.ac.cn/handle/311005/224680
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Xu, QQ,Wang, Q,王雅琼;Wang, AQ,et al. Systematical study of depositing nanoparticles and nanowires in mesoporous silica using supercritical carbon dioxide and co-solvents: morphology control, thermodynamics and kinetics of adsorption[J]. NANOTECHNOLOGY,2012,23(28):285602.
APA Xu, QQ,Wang, Q,王雅琼;Wang, AQ,Yin, JZ,&Yu-Liu.(2012).Systematical study of depositing nanoparticles and nanowires in mesoporous silica using supercritical carbon dioxide and co-solvents: morphology control, thermodynamics and kinetics of adsorption.NANOTECHNOLOGY,23(28),285602.
MLA Xu, QQ,et al."Systematical study of depositing nanoparticles and nanowires in mesoporous silica using supercritical carbon dioxide and co-solvents: morphology control, thermodynamics and kinetics of adsorption".NANOTECHNOLOGY 23.28(2012):285602.
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