| Crystalline ice growth on Pt(111) and Pd(111): nonwetting growth on a hydrophobic water monolayer. | |
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MedLine Citation:
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PMID: 17381223 Owner: NLM Status: PubMed-not-MEDLINE |
Abstract/OtherAbstract:
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The growth of crystalline ice films on Pt(111) and Pd(111) is investigated using temperature programed desorption of the water films and of rare gases adsorbed on the water films. The water monolayer wets both Pt(111) and Pd(111) at all temperatures investigated [e.g., 20-155 K for Pt(111)]. However, crystalline ice films grown at higher temperatures (e.g., T>135 K) do not wet the monolayer. Similar results are obtained for crystalline ice films of D2O and H2O. Amorphous water films, which initially wet the surface, crystallize and dewet, exposing the water monolayer when they are annealed at higher temperatures. Thinner films crystallize and dewet at lower temperatures than thicker films. For samples sputtered with energetic Xe atoms to prepare ice crystallites surrounded by bare Pt(111), subsequent annealing of the films causes water molecules to diffuse off the ice crystallites to reform the water monolayer. A simple model suggests that, for crystalline films grown at high temperatures, the ice crystallites are initially widely separated with typical distances between crystallites of approximately 14 nm or more. The experimental results are consistent with recent theory and experiments suggesting that the molecules in the water monolayer form a surface with no dangling OH bonds or lone pair electrons, giving rise to a hydrophobic water monolayer on both Pt(111) and Pd(111). |
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Authors:
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Greg A Kimmel; Nikolay G Petrik; Zdenek Dohnálek; Bruce D Kay |
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Publication Detail:
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Type: Journal Article; Research Support, U.S. Gov't, Non-P.H.S. |
Journal Detail:
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Title: The Journal of chemical physics Volume: 126 ISSN: 0021-9606 ISO Abbreviation: J Chem Phys Publication Date: 2007 Mar |
Date Detail:
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Created Date: 2007-03-26 Completed Date: 2007-05-11 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 0375360 Medline TA: J Chem Phys Country: United States |
Other Details:
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Languages: eng Pagination: 114702 Citation Subset: - |
Affiliation:
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Chemical and Materials Sciences Division, Pacific Northwest National Laboratory, P.O. Box 999, Richland, Washington 99352, USA. gregory.kimmel@pnl.gov |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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