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  Density depletion at solid−liquid interfaces:  a neutron reflectivity study

Maccarini, M., Steitz, R., Himmelhaus, M., Fick, J., Tatur, S., Wolff, M., et al. (2006). Density depletion at solid−liquid interfaces:  a neutron reflectivity study. Langmuir, 23(2), 598-608. doi:10.1021/la061943y.

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Item Permalink: https://hdl.handle.net/21.11116/0000-0001-9EB2-4 Version Permalink: https://hdl.handle.net/21.11116/0000-0001-9EB3-3
Genre: Journal Article

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 Creators:
Maccarini, M., Author
Steitz, R., Author
Himmelhaus, M., Author
Fick, J., Author
Tatur, S., Author
Wolff, M., Author
Grunze, Michael1, Author           
Janecek, J., Author
Netz, R. R., Author
Affiliations:
1Cellular Biophysics, Max Planck Institute for Medical Research, Max Planck Society, ou_2364731              

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 Abstract: 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.

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Language(s): eng - English
 Dates: 2006-07-052006-09-242006-11-22
 Publication Status: Issued
 Pages: 11
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1021/la061943y
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Title: Langmuir
Source Genre: Journal
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Publ. Info: Columbus, OH : American Chemical Society
Pages: - Volume / Issue: 23 (2) Sequence Number: - Start / End Page: 598 - 608 Identifier: ISSN: 0743-7463
CoNE: https://pure.mpg.de/cone/journals/resource/954925541194