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学科主题: 物理化学
题名: Diffusion of Water Inside Carbon Nanotubes Studied by Pulsed Field Gradient NMR Spectroscopy
作者: Liu, Xin1;  Pan, Xiulian1;  Zhang, Shanmin2;  Han, Xiuwen1;  Bao, Xinhe1
通讯作者: 包信和
刊名: LANGMUIR
发表日期: 2014-07-15
DOI: 10.1021/la500913r
卷: 30, 期:27, 页:8036-8045
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences ;  Technology
类目[WOS]: Chemistry, Multidisciplinary ;  Chemistry, Physical ;  Materials Science, Multidisciplinary
研究领域[WOS]: Chemistry ;  Materials Science
英文摘要: Diffusion dynamics of guest molecules in nanopores has been studied intensively because diffusion is center on a number of research fields such as separation, drug delivery, chemical reactions, and sensing. In the present work, we report an experimental investigation of the self-diffusion of water inside carbon nanotube (CNT) channels using a pulsed field gradient (PFG) NMR method. The dispersion of CNTs homogeneously in water and cooling to temperatures below the melting point of bulk water allow us to probe the translational motion of confined water molecules. The results demonstrate that the self-diffusion coefficient of water in CNTs is highly dependent on the diffusion time and CNT diameter. In particular, the diffusivity of water in double-walled carbon nanotubes (DWNTs) with an average inner diameter of 2.3 +/- 0.3 nm is twice that in multiwalled carbon nanotubes (MWNTs) with an average inner diameter of 6.7 +/- 0.8 nm in the temperature range of 263-223 K. In addition, the effective self-diffusion coefficient in DWNTs is 1 order of magnitude higher than that reported for mesoporous silica materials with a similar pore size. The faster diffusivity of water in CNTs could be attributed to the ordered hydrogen bonds formed between water molecules within the confined channels of CNTs and the weak interaction between water and the CNT walls.
关键词[WOS]: SINGLE-FILE DIFFUSION ;  SELF-DIFFUSION ;  MASS-TRANSPORT ;  SURFACE-AREA ;  FLUID-FLOW ;  MEMBRANES ;  CATALYSIS ;  ZEOLITES ;  MCM-41 ;  DIFFUSIVITIES
语种: 英语
WOS记录号: WOS:000339229000014
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/144269
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
2.E China Normal Univ, Dept Phys, Shanghai Key Lab Magnet Resonance, Shanghai 200062, Peoples R China

Recommended Citation:
Liu, Xin,Pan, Xiulian,Zhang, Shanmin,et al. Diffusion of Water Inside Carbon Nanotubes Studied by Pulsed Field Gradient NMR Spectroscopy[J]. LANGMUIR,2014,30(27):8036-8045.
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