Percolation transition of hydration water at hydrophilic surfaces

A. Oleinikova, I. Brovchenko and A. Geiger

Physica A: Statistical Mechanics and its Applications, 2006, vol. 364, issue C, 1-12

Abstract: An analysis of water clustering is used to study the quasi-2D percolation transition of water adsorbed at planar hydrophilic surfaces. Above the critical temperature of the layering transition (quasi-2D liquid–vapor phase transition of adsorbed molecules) a percolation transition occurs at some threshold surface coverage, which increases with increasing temperature. The location of the percolation line is consistent with the existence of a percolation transition at the critical point. The percolation threshold at a planar surface is weakly sensitive to the size of the system when its lateral dimension increases from 80 to 150Å. The size distribution of the largest water cluster shows a specific two-peaks structure in a wide range of surface coverage: the lower- and higher-size peaks represent contributions from non-spanning and spanning clusters, respectively. The ratio of the average sizes of spanning and non-spanning largest clusters is about 1.8 for all studied planes. The two-peak structure becomes more pronounced with decreasing size of the planar surface and strongly enhanced at spherical surfaces.

Keywords: Percolation transition; Hydration water; Clustering (search for similar items in EconPapers)
Date: 2006
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:phsmap:v:364:y:2006:i:c:p:1-12

DOI: 10.1016/j.physa.2005.09.049

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