Diffusion of Water Inside Carbon Nanotubes Studied by Pulsed Field Gradient NMR Spectroscopy

	Diffusion of Water Inside Carbon Nanotubes Studied by Pulsed Field Gradient NMR Spectroscopy
	Liu, Xin 1; Pan, Xiulian 1; Zhang, Shanmin 2; Han, Xiuwen 1; Bao, Xinhe 1
刊名	langmuir
	2014-07-15
卷号	30 期号:27 页码:8036-8045
通讯作者	包信和
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.
学科主题	物理化学
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
关键词[WOS]	single-file diffusion ; self-diffusion ; mass-transport ; surface-area ; fluid-flow ; membranes ; catalysis ; zeolites ; mcm-41 ; diffusivities
收录类别	SCI
语种	英语
WOS记录号	WOS:000339229000014
公开日期	2016-05-09
内容类型	期刊论文
源URL	[http://cas-ir.dicp.ac.cn/handle/321008/144269]
专题	大连化学物理研究所_中国科学院大连化学物理研究所
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
推荐引用方式 GB/T 7714	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.
APA	Liu, Xin,Pan, Xiulian,Zhang, Shanmin,Han, Xiuwen,&Bao, Xinhe.(2014).Diffusion of Water Inside Carbon Nanotubes Studied by Pulsed Field Gradient NMR Spectroscopy.langmuir,30(27),8036-8045.
MLA	Liu, Xin,et al."Diffusion of Water Inside Carbon Nanotubes Studied by Pulsed Field Gradient NMR Spectroscopy".langmuir 30.27(2014):8036-8045.