Single-File Diffusion of Confined Water Inside SWNTs: An NMR Study


Autoria(s): Das, A; Jayanthi, S; Deepak, HSMV; Ramanathan, KV; Kumar, A; Dasgupta, C; Sood, AK
Data(s)

01/03/2010

Resumo

We report a nuclear magnetic resonance (NMR) study of confined water inside similar to 1.4 nm diameter single-walled carbon nanotubes (SWNTs). We show that the confined water does not freeze even up to 223 K. A pulse field gradient (PFG) NMR method is used to determine the mean squared displacement (MSD) of the water molecules inside the nanotubes at temperatures below 273 K, where the bulk water outside the nanotubes freezes and hence does not contribute to the proton NMR signal. We show that the mean squared displacement varies as the square root of time, predicted for single-file diffusion in a one-dimensional channel. We propose a qualitative understanding of our results based on available molecular dynamics simulations.

Formato

application/pdf

Identificador

http://eprints.iisc.ernet.in/29116/1/NMR.pdf

Das, A and Jayanthi, S and Deepak, HSMV and Ramanathan, KV and Kumar, A and Dasgupta, C and Sood, AK (2010) Single-File Diffusion of Confined Water Inside SWNTs: An NMR Study. In: ACS Nano, 4 (3). pp. 1687-1695.

Publicador

American Chemical Society

Relação

http://pubs.acs.org/doi/abs/10.1021/nn901554h

http://eprints.iisc.ernet.in/29116/

Palavras-Chave #NMR Research Centre (Formerly SIF) #Physics
Tipo

Journal Article

PeerReviewed