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题名: The Formation Mechanism of Ag/SBA-15 Nanocomposites Prepared via In-Situ pH-Adjusting Method
作者: Qu, Zhenping1;  Zhang, Xiaodong1;  Lv, Yang2;  Quan, Xie1;  Fu, Qiang3
关键词: Ag/SBA-15 ;  In-Situ Synthesis ;  pH-Adjusting ;  Mesoporous Materials ;  The Formation Mechanism
刊名: JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
发表日期: 2013-07-01
DOI: 10.1166/jnn.2013.7543
卷: 13, 期:7, 页:4573-4580
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences ;  Technology
类目[WOS]: Chemistry, Multidisciplinary ;  Nanoscience & Nanotechnology ;  Materials Science, Multidisciplinary ;  Physics, Applied ;  Physics, Condensed Matter
研究领域[WOS]: Chemistry ;  Science & Technology - Other Topics ;  Materials Science ;  Physics
英文摘要: In this paper, the mesostructures and formation mechanism of Ag/SBA-15 nanocomposites by in-situ "pH-adjusting" method were studied. Characterization results, such as X-ray powder diffraction, N-2 adsorption-desorption isotherms and Transmission electron microscope, showed that the resultant materials exhibited highly ordered hexagonal mesoporous structures, which were strongly correlated to the pH values in the synthesis solution. The pH value also strongly affected the incorporation of silver nanoparticles into the channels. When the pH value of the solution was <= 7.5, the highly ordered Ag/SBA-15 nanocomposites were synthesized successfully; moreover, more and more Ag(NH3)(+) reacts with Si-OH groups in the channels, which resulted in the increase of silver nanoparticles in the channels with the increase of the pH value. Further increasing the pH value, overmuch OH- reacts with Ag+, leading to the decrease of the coated Ag species and the structural order of Ag/SBA-15 nanocomposites. It was found that silver ions could be automatically reduced to silver atoms during the crystallization procedure.
关键词[WOS]: MESOPOROUS MOLECULAR-SIEVES ;  SILICA FILMS ;  SILVER NANOPARTICLES ;  THERMAL-STABILITY ;  CO OXIDATION ;  SBA-15 ;  SURFACTANT ;  TRIBLOCK ;  AG ;  AGGREGATION
语种: 英语
WOS记录号: WOS:000320632100008
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/137489
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 Environm Sci & Technol, Key Lab Ind Ecol & Environm Engn MOE, Dalian 116024, Peoples R China
2.Dalian Univ Technol, Sch Civil Engn, Fac Infrastruct Engn, Dalian 116024, Peoples R China
3.Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Catalysis, Dalian 116023, Peoples R China

Recommended Citation:
Qu, Zhenping,Zhang, Xiaodong,Lv, Yang,et al. The Formation Mechanism of Ag/SBA-15 Nanocomposites Prepared via In-Situ pH-Adjusting Method[J]. JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY,2013,13(7):4573-4580.
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