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题名: Systematical study of depositing nanoparticles and nanowires in mesoporous silica using supercritical carbon dioxide and co-solvents: morphology control, thermodynamics and kinetics of adsorption
作者: Xu, Qin-qin1;  Wang, Ya-qiong1, 2;  Wang, Ai-qin3;  Yin, Jian-zhong1;  Yu-Liu4
刊名: NANOTECHNOLOGY
发表日期: 2012-07-20
DOI: 10.1088/0957-4484/23/28/285602
卷: 23, 期:28
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Technology ;  Physical Sciences
类目[WOS]: Nanoscience & Nanotechnology ;  Materials Science, Multidisciplinary ;  Physics, Applied
研究领域[WOS]: Science & Technology - Other Topics ;  Materials Science ;  Physics
英文摘要: 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).
关键词[WOS]: FLUID DEPOSITION ;  COPPER NANOPARTICLES ;  ACTIVATED CARBON ;  FILMS ;  NANOSTRUCTURES ;  DESORPTION ;  REDUCTION ;  NANOTUBES ;  OXIDATION ;  NANORODS
语种: 英语
WOS记录号: WOS:000305972600006
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/143042
Appears in Collections:中国科学院大连化学物理研究所_期刊论文

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作者单位: 1.Dalian Univ Technol, State Key Lab Fine Chem, Sch Chem Machinery, Dalian 116023, Peoples R China
2.Chinese Acad Sci, Inst High Energy Phys, Beijing 100049, Peoples R China
3.Chinese Acad Sci, Dalian Inst Chem Phys, Dalian 116023, Peoples R China
4.Dalian Univ Technol, Sch Energy & Power Engn, Dalian 116023, Peoples R China

Recommended Citation:
Xu, Qin-qin,Wang, Ya-qiong,Wang, Ai-qin,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).
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