The interaction of small oxygenated fluorocarbons and hydrocarbons with the Ru(001) surface
The interaction of oxygenated fluorocarbons with Ru(001) is investigated by thermal desorption spectroscopy in an effort to model how technologically important lubricants interact with metal surfaces. The data are compared with those of analogous oxygenated hydrocarbons. In the limit of low exposure, fluorinated molecules bond between 8 and 18 kJ/mol more weakly to Ru(001) than analogous hydrocarbons in cases where the interaction arises from oxygen lone pair electron donation to the surface. Adsorbed oxygenated fluorocarbons are more stable toward decomposition than the hydrogenated compounds. The stability of the fluorocarbons is attributed to the weak adsorption bond, the strength of the C-F bond or the adsorption geometry. The adsorption bonds of oligomeric ethers do not increase in multiples of the monoether-surface bond. For a fluorinated diether, the adsorption bond is approximately equal to that of the monoether. For the hydrogenated ethers, the adsorption bond increases up to 35% on the addition of an ether linkage. This increase is attributed to adsorption primarily through only one oxygen-metal bond or through several weaker-than-expected oxygen-metal bonds. Fundamental research on the interaction of oxygenated fluorocarbons with metal surfaces, such as that described here, can potentially improve the related industrially important lubricants. 129 refs., 35 figs., 7 tabs.
- Research Organization:
- Ames Lab., IA (USA)
- Sponsoring Organization:
- DOE/ER
- DOE Contract Number:
- W-7405-ENG-82
- OSTI ID:
- 6835384
- Report Number(s):
- IS-T-1481; ON: DE90011749
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
360104 -- Metals & Alloys-- Physical Properties
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ADHESION
ADSORPTION
CHEMICAL BONDS
CHEMICAL REACTIONS
CHEMISORPTION
COMPUTER CODES
DECOMPOSITION
DESORPTION
ELEMENTS
ETHERS
KETONES
LUBRICANTS
METALS
ORGANIC COMPOUNDS
ORGANIC FLUORINE COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
PLATINUM METALS
RUTHENIUM
SEPARATION PROCESSES
SORPTION
SORPTIVE PROPERTIES
SPECTRA
SURFACE PROPERTIES
TRANSITION ELEMENTS
360104 -- Metals & Alloys-- Physical Properties
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ADHESION
ADSORPTION
CHEMICAL BONDS
CHEMICAL REACTIONS
CHEMISORPTION
COMPUTER CODES
DECOMPOSITION
DESORPTION
ELEMENTS
ETHERS
KETONES
LUBRICANTS
METALS
ORGANIC COMPOUNDS
ORGANIC FLUORINE COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
PLATINUM METALS
RUTHENIUM
SEPARATION PROCESSES
SORPTION
SORPTIVE PROPERTIES
SPECTRA
SURFACE PROPERTIES
TRANSITION ELEMENTS