Water confined in carbon nanotubes: Magnetic response and proton chemical shieldings
We study the proton nuclear magnetic resonance ({sup 1}H-NMR) of a model system consisting of liquid water in infinite carbon nanotubes (CNT). Chemical shieldings are evaluated from linear response theory, where the electronic structure is derived from density functional theory (DFT) with plane-wave basis sets and periodic boundary conditions. The shieldings are sampled from trajectories generated via first-principles molecular dynamics simulations at ambient conditions, for water confined in (14,0) and (19,0) CNTs with diameters d = 11 {angstrom} and 14.9 {angstrom}, respectively. We find that confinement within the CNT leads to a large ({approx} -23 ppm) upfield shift relative to bulk liquid water. This shift is a consequence of strongly anisotropic magnetic fields induced in the CNT by an applied magnetic field.
- Research Organization:
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 957170
- Report Number(s):
- LLNL-JRNL-408883; TRN: US1002293
- Journal Information:
- Journal of Physical Chemistry. C, Vol. 113, Issue 20; ISSN 1932-7447
- Country of Publication:
- United States
- Language:
- English
Similar Records
Classical trajectory studies of the D + H2 → HD + H reaction confined in carbon nanotubes: effects of collisions with the nanotube walls.
Classical trajectory studies of the D + H{sub 2} {r_arrow} HD + H reaction confined in carbon nanotubes : parallel trajectories.