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题名: Distribution of gallium nanocrystals in Ga/MCM-41 mesocomposites by continuous-flow hyperpolarized Xe-129 NMR spectroscopy
作者: Zhang, WP;  Ratcliffe, CI;  Moudrakovski, IL;  Mou, CY;  Ripmeester, JA
刊名: ANALYTICAL CHEMISTRY
发表日期: 2005-05-15
DOI: 10.1021/ac050076j
卷: 77, 期:10, 页:3379-3382
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences
类目[WOS]: Chemistry, Analytical
研究领域[WOS]: Chemistry
英文摘要: The distribution of gallium nanocrystals in mesoporous MCM-41 host were analyzed by continuous-flow hyperpolarized Xe-129 NMR spectroscopy. In contrast to unclear TEM images for the high metal contents, laser-polarized Xe-129 probe can detect the whole distribution of gallium in the MCM-41 host. It is found that gallium nanocrystals are included in the mesochannels of MCM-41; a part of them also remains in the interparticle voids. The distribution of gallium metal in MCM-41 is heterogeneous. Not all the mesochannels host metallic gallium even at a high gallium loading of 65.1 wt %. Variable temperature measurements can provide information on the xenon adsorption parameters. This approach opens a sensitive way to probe the distribution of high content species in porous host materials.
关键词[WOS]: CHEMICAL-SHIFT ;  XENON ;  SURFACE ;  NANOWIRES ;  SILICAS ;  SBA-15 ;  SITES ;  PORES ;  PROBE
语种: 英语
WOS记录号: WOS:000229206800044
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/139790
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.Natl Res Council Canada, Steacie Inst Mol Sci, Ottawa, ON K1A 0R6, Canada
2.Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Catalysis, Dalian 116023, Peoples R China
3.Natl Taiwan Univ, Dept Chem, Taipei 10764, Taiwan
4.Natl Taiwan Univ, Ctr Condensed Matter Res, Taipei 10764, Taiwan

Recommended Citation:
Zhang, WP,Ratcliffe, CI,Moudrakovski, IL,et al. Distribution of gallium nanocrystals in Ga/MCM-41 mesocomposites by continuous-flow hyperpolarized Xe-129 NMR spectroscopy[J]. ANALYTICAL CHEMISTRY,2005,77(10):3379-3382.
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