The role of lattice parameter in water adsorption and wetting of a solid surface

Massey, A, McBride, F, Darling, GR, Nakamura, M and Hodgson, A
(2014) The role of lattice parameter in water adsorption and wetting of a solid surface. PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 16 (43). pp. 24018-24025.

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Ice formation is a complex cooperative process that is almost invariably catalysed by the presence of an interface on which ice crystals nucleate. As yet there is no clear picture of what factors make a surface particularly good at nucleating ice, but the importance of having a template with a suitable lattice parameter has often been proposed. Here we report the contrasting wetting behaviour of a series of pseudomorphic surfaces, designed to form an ordered template that matches the arrangement of water in a bulk ice Ih(0001) bilayer. The close-packed M(111) surfaces (M = Pt, Pd, Rh, Cu and Ni) form a (√3 × √3) R30° Sn substitutional alloy surface, with Sn atoms occupying sites that match the symmetry of an ice bilayer. The lattice constant of the alloy changes from 4% smaller to 7% greater than the lateral spacing of ice across the series. We show that only the PtSn surface, with a lattice parameter some 7% greater than that of a bulk ice layer, forms a stable water layer, all the other surfaces being non-wetting and instead forming multilayer ice clusters. This observation is consistent with the idea that the repeat spacing of the surface should ideally match the O-O spacing in ice, rather than the bulk ice lattice parameter, in order to form a continuous commensurate water monolayer. We discuss the role of the lattice parameter in stabilising the first layer of water and the factors that lead to formation of a simple commensurate structure rather than an incommensurate or large unit cell water network. We argue that lattice match is not a good criteria for a material to give low energy nucleation sites for bulk ice, and that considerations such as binding energy and mobility of the surface layer are more relevant.

Item Type: Article
Uncontrolled Keywords: 51 Physical Sciences, 5104 Condensed Matter Physics
Subjects: ?? QC ??
?? QD ??
Depositing User: Symplectic Admin
Date Deposited: 14 Jul 2015 14:32
Last Modified: 20 Jun 2024 19:41
DOI: 10.1039/c4cp03164d
Publisher's Statement : This article is licensed under a Creative Commons Attribution 3.0 Unported Licence.
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