Molecular orientation and bonding of monolayer stearic acid on a copper surface prepared in air

被引：23

作者：

Fischer, D. A. ^{[1
]}

Hu, Z. S. ^{[1
]}

Hsu, S. M. ^{[1
]}

机构：

[1] Natl Inst Stand & Technol, Gaithersburg, MD 20899 USA

来源：

TRIBOLOGY LETTERS | 1997年 / 3卷 / 01期

关键词：

X-ray absorption; stearic acid monolayers; molecular orientation; copper surfaces; tribochemical modification;

D O I：

10.1023/A:1019148131061

中图分类号：

TQ [化学工业];

学科分类号：

0817 ;

摘要：

The molecular orientation of a monolayer stearic acid, adsorbed on a copper surface in air, was studied by means of Xray absorption spectroscopy above the carbon and oxygen K edges. Carbon-K-edge X-ray absorption measurements were used to quantify the molecular tilt of the alkyl chain from the surface normal, which was found to be 49 and 39 respectively before and after rubbing. Tribochemical bonding chemistry was observed using oxygen-K-edge X-ray absorption measurements. Chemisorbed stearic acid was found to adsorb initially in both monodentate and bidentate sites. The monodentate chemisorbed stearic acid was then transformed to a bidentate surface configuration after tribochemical reaction. Furthermore, spectra from the chemisorbed stearic acid monolayer were similar to the spectrum from a bulk stearic acid powder standard, and the data from the tribochemically modified stearic acid monolayer surface appeared to be identical to that from a bulk cupric stearate.

引用

页码：41 / 45

页数：5

共 14 条

[11]

Seah M. P., 1979, SURF INTERFACE ANAL, V1, P2, DOI DOI 10.1002/SIA.740010103

[12] CORRELATION BETWEEN INTRAMOLECULAR BOND LENGTHS AND K-SHELL SIGMA-SHAPE RESONANCES IN GAS-PHASE MOLECULES [J].

SETTE, F ;

STOHR, J ;

HITCHCOCK, AP .

CHEMICAL PHYSICS LETTERS, 1984, 110 (05) :517-520

[13] DETERMINATION OF MOLECULAR ORIENTATIONS ON SURFACES FROM THE ANGULAR-DEPENDENCE OF NEAR-EDGE X-RAY-ABSORPTION FINE-STRUCTURE SPECTRA [J].

STOHR, J ;

OUTKA, DA .

PHYSICAL REVIEW B, 1987, 36 (15) :7891-7905

[14]

Stohr J., 1992, NEXAFS SPECTROSCOPY, P276, DOI [10.1007/978-3-662-02853-7_9, DOI 10.1007/978-3-662-02853-7_9]

← 1 2 →