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题名: Comprehensive study of the role of ethylene glycol when preparing Ag@SBA-15 in supercritical CO2
作者: Xu, Qin-Qin1;  Ma, Yu-Ling1;  Gang-Xu1;  Yin, Jian-Zhong1;  Wang, Ai-Qin2;  Gao, Jin-Ji1
关键词: Supercritical CO2 ;  Ag nanowires ;  Ethylene glycol ;  Non-equilibrium sorption
刊名: JOURNAL OF SUPERCRITICAL FLUIDS
发表日期: 2014-08-01
DOI: 10.1016/j.supflu.2014.05.007
卷: 92, 页:100-106
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences ;  Technology
类目[WOS]: Chemistry, Physical ;  Engineering, Chemical
研究领域[WOS]: Chemistry ;  Engineering
英文摘要: Well-defined Ag nanowires were obtained in SBA-15 at a short deposition time of 5 min in supercritical CO2 when adding a small amount of ethylene glycol as the co-solvent. Ethylene glycol played a key role in dictating the nanowire morphology. Through detailed investigation of the whole deposition process, including the dissolution of precursor assisted by the co-solvent, the diffusion properties of the precursor into the nano-scale channels of the substrate, and the interaction between the precursor and the substrate, we found that a small amount of precursors were reduced into Ag-0 by ethylene glycol at the initial stage of the deposition. The resultant Ag-0 then acted as nuclei leading to a non-equilibrium sorption of the precursor. The rapid adsorption of the precursor onto the substrate resulted in a high loading of Ag in a short deposition time and the formation of nanowire morphology. Furthermore, this method was successfully extended to other porous substrates such as gamma-Al2O3, SiO2 and KIT-6, demonstrating its great potentials in the synthesis of nanocomposites. (C) 2014 Elsevier B.V. All rights reserved.
关键词[WOS]: EQUATION-OF-STATE ;  CARBON-DIOXIDE ;  MESOPOROUS SILICA ;  FLUID DEPOSITION ;  SILVER NANOSTRUCTURES ;  NANOPARTICLES ;  NANOWIRES ;  NANOCOMPOSITES ;  NANOCRYSTALS ;  NANOTUBES
语种: 英语
WOS记录号: WOS:000341559500013
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/145586
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, Sch Chem Machinery, State Key Lab Fine Chem, Dalian 116024, Liao Ning Provi, Peoples R China
2.Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Catalysis, Dalian 116023, Peoples R China

Recommended Citation:
Xu, Qin-Qin,Ma, Yu-Ling,Gang-Xu,et al. Comprehensive study of the role of ethylene glycol when preparing Ag@SBA-15 in supercritical CO2[J]. JOURNAL OF SUPERCRITICAL FLUIDS,2014,92:100-106.
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