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Formation of ultra-thin bi-molecular boundary adsorbed films

Formation of ultra-thin bi-molecular boundary adsorbed films
Formation of ultra-thin bi-molecular boundary adsorbed films
An analytical method based on statistical mechanics is proposed for the prediction of ultra-thin adsorbed films of physical fluids of molecular diversity formed on smooth surfaces. The model is representative of molecular interactions at the smooth summits of surface asperities in the nano-scale. At this physical scale the constraining effect of the solid barriers promotes discretisation of the fluid volume into molecular layers, which are usually ejected from the contact in a stepwise manner. The integrated effect of intermolecular interactions of molecular species as well as their interactions with the contiguous surfaces is responsible for this discontinuous drainage of the fluid. However, at the same time, the adsorption energy of the molecular species strives to form a molecular mono-layer upon the boundary solids. The net result of these complex interactions is an ultra-thin adsorbed film whose shear characteristics depends on a competition between the repulsive solvation pressure and the energy of molecular adsorption. It is shown that very thin low shear strength films formed in this manner depend on ideal molecular concentration and wall adsorption energy. An important implication is that boundary adherent films should be viewed as a result of surface- fluid combination for which choice of concentration and fraction content of particular species are crucial.
0022-3727
115303-[11pp]
Chong, W.W.F.
ddfcee50-9898-41be-b32c-b1b9932a1748
Teodorescu, M.
10e22073-39f7-41c3-b2b7-2886c2d976f6
Rahnejat, H.
f5b9b13a-dc42-4fde-a98d-4e0c48bb19ab
Chong, W.W.F.
ddfcee50-9898-41be-b32c-b1b9932a1748
Teodorescu, M.
10e22073-39f7-41c3-b2b7-2886c2d976f6
Rahnejat, H.
f5b9b13a-dc42-4fde-a98d-4e0c48bb19ab

Chong, W.W.F., Teodorescu, M. and Rahnejat, H. (2012) Formation of ultra-thin bi-molecular boundary adsorbed films. Journal of Physics D: Applied Physics, 45 (11), 115303-[11pp]. (doi:10.1088/0022-3727/45/11/115303).

Record type: Article

Abstract

An analytical method based on statistical mechanics is proposed for the prediction of ultra-thin adsorbed films of physical fluids of molecular diversity formed on smooth surfaces. The model is representative of molecular interactions at the smooth summits of surface asperities in the nano-scale. At this physical scale the constraining effect of the solid barriers promotes discretisation of the fluid volume into molecular layers, which are usually ejected from the contact in a stepwise manner. The integrated effect of intermolecular interactions of molecular species as well as their interactions with the contiguous surfaces is responsible for this discontinuous drainage of the fluid. However, at the same time, the adsorption energy of the molecular species strives to form a molecular mono-layer upon the boundary solids. The net result of these complex interactions is an ultra-thin adsorbed film whose shear characteristics depends on a competition between the repulsive solvation pressure and the energy of molecular adsorption. It is shown that very thin low shear strength films formed in this manner depend on ideal molecular concentration and wall adsorption energy. An important implication is that boundary adherent films should be viewed as a result of surface- fluid combination for which choice of concentration and fraction content of particular species are crucial.

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Published date: 5 March 2012
Organisations: nCATS Group

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Local EPrints ID: 353118
URI: https://eprints.soton.ac.uk/id/eprint/353118
ISSN: 0022-3727
PURE UUID: c411d841-70ed-4b63-a291-cafcb675a648

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Date deposited: 03 Jun 2013 08:46
Last modified: 18 Jul 2017 04:07

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