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Diffusion of water submonolayers on hydrophilic surfaces Jae Hyun Park and N. R. Alurua

Summary: Diffusion of water submonolayers on hydrophilic surfaces
Jae Hyun Park and N. R. Alurua
Department of Mechanical Science and Engineering, Beckman Institute for Advanced Science
and Technology, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA
Received 4 September 2008; accepted 27 November 2008; published online 22 December 2008
In this letter, we investigate using molecular dynamics simulations the diffusion of water
submonolayers on hydrophilic surfaces. In contrast to a strong hydrophilic Ag surface, on a weak
hydrophilic Pb surface, the diffusion coefficient is remarkably enhanced at a critical surface
coverage and a -shape anomaly with surface coverage is observed, i.e., the diffusion coefficient
increases with the increase in surface coverage until a critical surface coverage, beyond which the
diffusion coefficient decreases. We explain the anomalous diffusion of water on hydrophilic surfaces
by a detailed understanding of molecular cavities and monolayer tail contributing to
three-dimensional hydrogen bonding. 2008 American Institute of Physics.
DOI: 10.1063/1.3054640
Transport of liquid submonolayers on solid substrates
has gained significant attention recently because of applica-
tions in nanolithography, nanoprinting, wetting/dewetting of
nanopatterned surfaces, etc.1
Diffusion of submonolayer liq-
uids can be markedly different from diffusion of bulk liquids


Source: Aluru, Narayana R. - Department of Mechanical and Industrial Engineering, University of Illinois at Urbana-Champaign


Collections: Engineering; Materials Science