PMID- 24951088
OWN - NLM
STAT- PubMed-not-MEDLINE
DCOM- 20150422
LR  - 20140715
IS  - 1520-5827 (Electronic)
IS  - 0743-7463 (Linking)
VI  - 30
IP  - 27
DP  - 2014 Jul 15
TI  - Diffusion of water inside carbon nanotubes studied by pulsed field gradient NMR 
      spectroscopy.
PG  - 8036-45
LID - 10.1021/la500913r [doi]
AB  - 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.
FAU - Liu, Xin
AU  - Liu X
AD  - State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese 
      Academy of Sciences , Zhongshan Road 457, Dalian 116023, PR China.
FAU - Pan, Xiulian
AU  - Pan X
FAU - Zhang, Shanmin
AU  - Zhang S
FAU - Han, Xiuwen
AU  - Han X
FAU - Bao, Xinhe
AU  - Bao X
LA  - eng
PT  - Journal Article
DEP - 20140702
PL  - United States
TA  - Langmuir
JT  - Langmuir : the ACS journal of surfaces and colloids
JID - 9882736
EDAT- 2014/06/22 06:00
MHDA- 2014/06/22 06:01
CRDT- 2014/06/22 06:00
PHST- 2014/06/22 06:00 [entrez]
PHST- 2014/06/22 06:00 [pubmed]
PHST- 2014/06/22 06:01 [medline]
AID - 10.1021/la500913r [doi]
PST - ppublish
SO  - Langmuir. 2014 Jul 15;30(27):8036-45. doi: 10.1021/la500913r. Epub 2014 Jul 2.