Fast photo-switchable surfaces for boiling heat transfer applications

Several milligrams of the ruthenium-centered organometallic complex, ruthenium bis-4,4′-di(thiomethyl)-2,2′-bipyridine, mono-2 -(2-pyridyl)-1,3-oxathiane ([Ru{(HS-CH2)2-bpy}2{pox}](PF6)2) were synthesized and used to produce a self assembled monolayer film on a gold substrate. X-ray photoelectron sp...

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Bibliographic Details
Published in:Applied physics letters 2012-11, Vol.101 (19)
Main Authors: Hunter, C. N., Turner, D. B., Jespersen, M. L., Check, M. H., Borton, P. T., Glavin, N. R., Voevodin, A. A.
Format: Article
Language:English
Subjects:
BIPYRIDINES
BOILING
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
Contact angle
GOLD
HEAT TRANSFER
Indication
IRRADIATION
Light irradiation
Metalorganic compounds
Monolayers
ORGANOMETALLIC COMPOUNDS
PHYSICAL RADIATION EFFECTS
Ruthenium
RUTHENIUM COMPLEXES
SUBSTRATES
SURFACES
THIN FILMS
VISIBLE RADIATION
WATER
X-RAY PHOTOELECTRON SPECTROSCOPY
X-rays
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Summary:Several milligrams of the ruthenium-centered organometallic complex, ruthenium bis-4,4′-di(thiomethyl)-2,2′-bipyridine, mono-2 -(2-pyridyl)-1,3-oxathiane ([Ru{(HS-CH2)2-bpy}2{pox}](PF6)2) were synthesized and used to produce a self assembled monolayer film on a gold substrate. X-ray photoelectron spectroscopy analysis of the film detected the presence of bound thiolate, which is an indication of a chemisorbed film. Water contact angle measurements were performed before and after 5 min of visible light irradiation using an ozone-free 1000 W Xe(Hg) arc source with a 425-680 nm long pass mirror. The contact angle changed from 52° pre-irradiation (hydrophilic state) to 95° post-irradiation (hydrophobic state).
ISSN:0003-6951
1077-3118
DOI:10.1063/1.4766345