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学科主题: 物理化学
题名: NMR Study of Preferential Endohedral Adsorption of Methanol in Multiwalled Carbon Nanotubes
作者: Liu, Xin1;  Pan, Xiulian1;  Shen, Wanling1;  Ren, Pengju1;  Han, Xiuwen1;  Bao, Xinhe1
通讯作者: 包信和
刊名: JOURNAL OF PHYSICAL CHEMISTRY C
发表日期: 2012-04-12
DOI: 10.1021/jp300138x
卷: 116, 期:14, 页:7803-7809
收录类别: SCI
文章类型: Article
部门归属: 5
项目归属: 502
产权排名: 1,1
类目[WOS]: Chemistry, Physical ;  Nanoscience & Nanotechnology ;  Materials Science, Multidisciplinary
研究领域[WOS]: Chemistry ;  Science & Technology - Other Topics ;  Materials Science
英文摘要: Adsorption of C-13-enriched methanol in multiwalled carbon nanotubes (MWNTs) was systematically studied under well-controlled environment by C-13 MAS NMR. The results of variable-pressure experiments indicate that the endohedral adsorption of methanol in carbon nanotubes (CNTs) is preferential over the exohedral adsorption. The exohedral adsorption does not occur until the endohedral adsorption saturates. The C-13 chemical shift of endohedral methanol exhibits a large upfield shift due to the strong spatial diamagnetic shielding effect induced by the delocalized electrons of nanotubes under the influence of external magnetic field. The exohedral methanol is also shielded, but to a lesser extent. DFT calculations support these experimental results. The C-13 spin lattice relaxation times, T-1, of endohedral and exohedral methanol were also measured, and they have different vapor pressure dependence at room temperature. Furthermore, variable-temperature experiments suggest that methanol molecules inside CNTs may form a layered structure at low temperature with one layer close to the wall and the second layer near the center of the nanotubes.
关键词[WOS]: PHYSICAL ADSORPTION ;  WATER-ADSORPTION ;  XE ADSORPTION ;  TIGHT-BINDING ;  SINGLE ;  SPECTROSCOPY ;  KINETICS ;  STORAGE ;  MODELS ;  XENON
语种: 英语
WOS记录号: WOS:000302591300025
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/118352
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.Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Catalysis, Dalian 116023, Peoples R China

Recommended Citation:
Liu, Xin,Pan, Xiulian,Shen, Wanling,et al. NMR Study of Preferential Endohedral Adsorption of Methanol in Multiwalled Carbon Nanotubes[J]. JOURNAL OF PHYSICAL CHEMISTRY C,2012,116(14):7803-7809.
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