Publication details

 

Charge Transfer between Water Molecules As the Possible Origin of the Observed Charging at the Surface of Pure Water

Basic information
Original title:Charge Transfer between Water Molecules As the Possible Origin of the Observed Charging at the Surface of Pure Water
Authors:Robert Vácha, Ondrej Marsalek, A.P. Willard, D.J. Bonthuis, R.R. Netz, Pavel Jungwirth
Further information
Citation:VÁCHA, Robert, Ondrej MARSALEK, A.P. WILLARD, D.J. BONTHUIS, R.R. NETZ a Pavel JUNGWIRTH. Charge Transfer between Water Molecules As the Possible Origin of the Observed Charging at the Surface of Pure Water. Journal of Physical Chemistry Letters, Washington: American Chemical Society, 2012, roč. 3, č. 1, s. 107–111. ISSN 1948-7185. doi:10.1021/jz20148521.Export BibTeX
@article{963560,
author = {Vácha, Robert and Marsalek, Ondrej and Willard, A.P. and Bonthuis, D.J. and Netz, R.R. and Jungwirth, Pavel},
article_location = {Washington},
article_number = {1},
doi = {http://dx.doi.org/10.1021/jz20148521},
keywords = {simple continuum model; shear surface; Gibbs dividing surface; water/vapor interface; hydrogen bonding asymmetry},
language = {eng},
issn = {1948-7185},
journal = {Journal of Physical Chemistry Letters},
title = {Charge Transfer between Water Molecules As the Possible Origin of the Observed Charging at the Surface of Pure Water},
url = {http://pubs.acs.org/doi/full/10.1021/jz2014852},
volume = {3},
year = {2012}
}
Original language:English
Field:Physical chemistry and theoretical chemistry
WWW:link to a new windowhttp://pubs.acs.org/doi/full/10.1021/jz2014852
Type:Article in Periodical
Keywords:simple continuum model; shear surface; Gibbs dividing surface; water/vapor interface; hydrogen bonding asymmetry

Classical molecular dynamics simulations point to an anisotropy of water–water hydrogen bonding at the water surface. Approaching from the gas phase, a region of primarily dangling hydrogens is followed by dangling oxygens before the isotropic bulk region. Using ab initio calculations, we translate this hydrogen bonding anisotropy to charge transfer between water molecules, which we analyze with respect to both instantaneous and averaged positions of the water surface. Similarly to the oil/water interface, we show that there is a region of small net negative charge extending 0.2 to 0.6 nm from the Gibbs dividing surface in the aqueous phase. Using a simple continuum model, we translate this charge profile to a zeta potential, which acquires for realistic positions of the shear surface the same negative sign as that observed experimentally, albeit of a smaller absolute value.

Related projects: