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231223s2007 xx ||||| 00| ||eng c |
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|a pubmed24n0566.xml
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|a (NLM)17432881
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|a DE-627
|b ger
|c DE-627
|e rakwb
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| 041 |
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|a eng
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| 100 |
1 |
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|a Yun, Yang
|e verfasserin
|4 aut
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| 245 |
1 |
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|a Oxidation kinetics of hydrogenated amorphous carbon (a-CH(x)) overcoats for magnetic data storage media
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| 264 |
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|c 2007
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|a Text
|b txt
|2 rdacontent
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|a ohne Hilfsmittel zu benutzen
|b n
|2 rdamedia
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|a Band
|b nc
|2 rdacarrier
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| 500 |
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|a Date Completed 27.06.2007
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|a Date Revised 01.05.2007
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|a published: Print-Electronic
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|a Citation Status PubMed-not-MEDLINE
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|a The oxidation kinetics of a-CHx overcoats during exposure to oxygen and water vapor have been measured using X-ray photoemission spectroscopy (XPS) in an apparatus that allows oxidation and analysis of freshly deposited a-CHx overcoats without prior exposure of the overcoats to air. The uptake of oxygen on the surfaces of the a-CHx overcoats has been measured at O2 and H2O pressures in the range 10(-7)-10(-3) Torr at room temperature. The uptake of oxygen during O2 exposures on the order of 10(7) Langmuirs leads to saturation of the a-CHx overcoat surfaces at oxidation levels on the order of 20%. This indicates that the surfaces of a-CHx overcoats are relatively inert to oxidation in the sense that the dissociative sticking coefficient of O2 is approximately 10(-6). Oxygen uptake during exposure to H2O vapor is similar to the uptake during exposure to O2 gas. Although the surfaces of the a-CHx overcoats are quite inhomogeneous, it has been possible to model the uptake of oxygen on their surfaces using a fairly simple Langmuir-Hinshelwood mechanism. Interestingly, the saturation coverage of oxygen during exposure to air at atmospheric pressure is approximately 6%, significantly lower than that obtained during low-pressure exposure to O2 gas or H2O vapor
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|a Journal Article
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| 700 |
1 |
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|a Ma, Xiaoding
|e verfasserin
|4 aut
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| 700 |
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|a Gui, Jing
|e verfasserin
|4 aut
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| 700 |
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|a Broitman, Esteban
|e verfasserin
|4 aut
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| 700 |
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|a Gellman, Andrew J
|e verfasserin
|4 aut
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| 773 |
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|i Enthalten in
|t Langmuir : the ACS journal of surfaces and colloids
|d 1992
|g 23(2007), 10 vom: 08. Mai, Seite 5485-90
|w (DE-627)NLM098181009
|x 1520-5827
|7 nnns
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| 773 |
1 |
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|g volume:23
|g year:2007
|g number:10
|g day:08
|g month:05
|g pages:5485-90
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|d 23
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|h 5485-90
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