Structured and viscous water in subnanometer gaps

Tai De Li, Jianping Gao, Robert Szoszkiewicz, Uzi Landman, Elisa Riedo

Research output: Contribution to journalArticle

Abstract

Direct and simultaneous measurements of the normal and lateral forces encountered by a nanosize spherical silicon tip approaching a solid surface in purified water are reported. For tip-surface distances, 0±0.03 nm<d<2 nm, experiments and grand canonical molecular-dynamics simulations find oscillatory solvation forces for hydrophilic surfaces, mica and glass, and less pronounced oscillations for a hydrophobic surface, graphite. The simulations reveal layering of the confined water density and the development of hexagonal order in layers proximal to a quartz surface. For subnanometer hydrophilic confinement, the lateral force measurements show orders of magnitude increase of the viscosity with respect to bulk water, agreeing with a simulated sharp decrease in the diffusion constant. No viscosity increase is observed for hydrophobic surfaces.

Original languageEnglish (US)
Article number115415
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume75
Issue number11
DOIs
StatePublished - Mar 15 2007

Fingerprint

Water
water
viscosity
Viscosity
Quartz
mica
Graphite
solid surfaces
Force measurement
Solvation
Mica
Silicon
solvation
quartz
simulation
graphite
Molecular dynamics
molecular dynamics
oscillations
glass

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Structured and viscous water in subnanometer gaps. / Li, Tai De; Gao, Jianping; Szoszkiewicz, Robert; Landman, Uzi; Riedo, Elisa.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 75, No. 11, 115415, 15.03.2007.

Research output: Contribution to journalArticle

Li, Tai De ; Gao, Jianping ; Szoszkiewicz, Robert ; Landman, Uzi ; Riedo, Elisa. / Structured and viscous water in subnanometer gaps. In: Physical Review B - Condensed Matter and Materials Physics. 2007 ; Vol. 75, No. 11.
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