2016/12/04 by Jamal Hassan, J. Hassan, G. Diamantopoulos +29
Chemistry · Engineering · Physics and Astronomy · #Advanced NMR Techniques and Applications #Carbon nanotube #Chemical physics #Chemistry #Diffusion #FOS: Physical sciences #Materials science #Mesoscale and Nanoscale Physics (cond-mat.mes-hall) #NMR spectroscopy and applications #Nanopore and Nanochannel Transport Studies #Nanoscopic scale #Nanotechnology #Physics #Relaxation (psychology) #Soft Condensed Matter (cond-mat.soft) #Spectroscopy #Thermodynamics #cond-mat.mes-hall #cond-mat.soft
paper · pdf · doi:10.48550/arxiv.1612.01161
Article: 6 pages, 5 figures. Submitted to PNAS. Supporting Information request at: [email protected]
openalex publication_date 2016/12/04 · arxiv created 2017/12/18 · arxiv updated 2017/12/19 · openalex created_date 2019/07/30 · openalex updated_date 2026/08/06
Water, when confined at the nanoscale acquires extraordinary transport properties. And yet there is no direct experimental evidence of these properties at nanoscale resolution. Here, by using 2D NMR diffusion-relaxation (D-T2) and spin-lattice - spin-spin relaxation (T1-T2) spectroscopy, we succeeded to resolve at the nanoscale water diffusion in single and double-walled carbon nanotubes (SWCNT/DWCNT). In SWCNTs, spectra display the characteristic shape of uniform water diffusion restricted in one dimension. Remarkably, in DWCNTs water is shown to split into two axial components with the inner one acquiring unusual flow properties: high fragility, ultrafast self-diffusion coefficient, and "rigid" molecular environment, revealing a stratified cooperative motion mechanism to underlie fast diffusion in water saturated CNTs.