This title appears in the Scientific Report :
2004
Please use the identifier:
http://hdl.handle.net/2128/762 in citations.
Please use the identifier: http://hdl.handle.net/2128/2662 in citations.
Please use the identifier: http://dx.doi.org/10.1039/b308125g in citations.
The nature of water on surfaces of laboratory systems and implications for heterogeneous chemistry in the troposphere
The nature of water on surfaces of laboratory systems and implications for heterogeneous chemistry in the troposphere
A number of heterogeneous reactions of atmospheric importance occur in thin water films on surfaces in the earth's boundary layer. It is therefore important to understand the interaction of water with various materials, both those used to study heterogeneous chemistry in laboratory systems, as...
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Personal Name(s): | Sumner, A. L. |
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Menke, E. J. / Dubrowski, Y. / Newberg, J. T. / Penner, R. M. / Hemminger, C. / Wingen, L. M. / Brauers, T. / Finlayson-Pitts, B. J. | |
Contributing Institute: |
Troposphäre; ICG-II |
Published in: | Physical Chemistry Chemical Physics, 6 (2004) S. 604 - 613 |
Imprint: |
Cambridge
RSC Publ.
2004
|
Physical Description: |
604 - 613 |
DOI: |
10.1039/b308125g |
Document Type: |
Journal Article |
Research Program: |
Chemie und Dynamik der Geo-Biosphäre |
Series Title: |
Physical Chemistry Chemical Physics
6 |
Subject (ZB): | |
Link: |
Get full text OpenAccess |
Publikationsportal JuSER |
Please use the identifier: http://hdl.handle.net/2128/2662 in citations.
Please use the identifier: http://dx.doi.org/10.1039/b308125g in citations.
A number of heterogeneous reactions of atmospheric importance occur in thin water films on surfaces in the earth's boundary layer. It is therefore important to understand the interaction of water with various materials, both those used to study heterogeneous chemistry in laboratory systems, as well as those found in the atmosphere. We report here studies at 22 degreesC to characterize the interaction of water with such materials as a function of relative humidity from 0 - 100%. The surfaces studied include borosilicate glass, both untreated and after cleaning by three different methods (water, hydrogen peroxide and an argon plasma discharge), quartz, FEP Teflon film, a self assembled monolayer of n-octyltrichlorosilane (C8 SAM) on glass, halocarbon wax coatings prepared by two different methods, and several different types of Teflon coatings on solid substrates. Four types of measurements covering the range from the macroscopic level to the molecular scale were made: ( 1) contact angle measurements of water droplets on these surfaces to obtain macroscopic scale data on the water-surface interaction, (2) atomic force microscopy measurements to provide micron to sub-micron level data on the surface topography, ( 3) transmission FTIR of the surfaces in the presence of increasing water vapor concentrations to probe the interaction with the surface at a molecular level, and ( 4) X-ray photoelectron spectroscopy measurements of the elemental surface composition of the glass and quartz samples. Both borosilicate glass and the halocarbon wax coatings adsorbed significantly more water than the FEP Teflon film, which can be explained by a combination of the chemical nature of the surfaces and their physical topography. The C8 SAM, which is both hydrophobic and has a low surface roughness, takes up little water. The implications for the formation of thin water films on various surfaces in contact with the atmosphere, including building materials, soil, and vegetation, are discussed. |