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Density depletion at solid-liquid interfaces: A neutron reflectivity study
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DOI：10.1021/la061943y.png)
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摘要
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Neutron reflectivity experiments conducted on self-assembled monolayers (SAMs) against polar (water) and nonpolar (organic) liquid phases reveal further evidence for a density reduction at hydrophobic-hydrophilic interfaces. The density depletion is found at the interface between hydrophobic dodecanethiol (C12) and hexadecanethiol (C16) SAMs and water and also between hydrophilic SAMs (C12/C11OH) and nonpolar fluids. The results show that the density deficit of a fluid in the boundary layer is not unique to aqueous solid-liquid interfaces but is more general and correlated with the affinity of the liquid to the solid surface. In water the variation of pH has only minor influence, while different electrolytes taken from the Hofmeister series seem to increase the depletion. On hydrophobic SAMs an increase in density depletion with temperature was observed, in agreement with Monte Carlo simulations performed on corresponding model systems. The increase in the water density depletion layer is governed by two effects: the surface energy difference between water and the substrate and the chemical potential of the aqueous phase.
Keyword:
SELF-ASSEMBLED MONOLAYERS
UNITED-ATOM DESCRIPTION
SURFACE FREE-ENERGY
WATER-STRUCTURE
TRANSFERABLE POTENTIALS
ACTIVITY-COEFFICIENTS
HYDROPHOBIC SURFACES
COMPUTER-SIMULATION
PHASE-EQUILIBRIA
MONTE-CARLO
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3.9
论文数:
5.4W
被引数:
10.6W
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Interaction of water with self-assembled monolayers: Neutron reflectivity measurements of the water density in the interface region.png)
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