Molecular orientation and bonding of monolayer stearicacid on a copper surface prepared in air
Molecular orientation and bonding of monolayer stearicacid on a copper surface prepared in air
复制标题
空气中制备的铜表面单层硬脂酸的分子取向和键合
DOI：
10.1023/a:1019148131061
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发表时间：
1997
影响因子：
3.2
通讯作者：
S. M. Hsu
中科院分区：
文献类型：
--
作者：
D. Fischer;Z. S. Hu;S. M. Hsu
本文用X射线吸收光谱法研究了硬脂酸在空气中吸附于铜表面的分子取向，用碳-K边X射线吸收测量定量了烷基链相对于表面法线的分子倾斜，摩擦前和摩擦后的摩擦角分别为49°和39°，用氧-K边X射线吸收法观察了摩擦化学键的形成。化学吸附的硬脂酸被发现最初吸附在单齿和双齿网站。单齿化学吸附的硬脂酸经过摩擦化学反应后转变为双齿表面构型。此外，从化学吸附的硬脂酸单分子层的光谱是相似的光谱从散装硬脂酸粉末标准，和数据从摩擦化学改性的硬脂酸单分子层表面似乎是相同的，从散装硬脂酸铜。
The molecular orientation of a monolayer stearic acid, adsorbedon a copper surface in air, was studied by means of X-rayabsorption spectroscopy above the carbon and oxygen K edges.Carbon-K-edge X-ray absorption measurements were used to quantifythe molecular tilt of the alkyl chain from the surface normal,which was found to be 49° and 39° respectively before andafter rubbing.Tribochemical bonding chemistry was observed using oxygen-K-edgeX-ray absorption measurements. Chemisorbed stearic acid was foundto adsorb initially in both monodentate and bidentate sites. Themonodentate chemisorbed stearic acid was thentransformed to a bidentate surface configuration aftertribochemical reaction. Furthermore, spectra from thechemisorbed stearic acid monolayer were similar to the spectrumfrom a bulk stearic acid powder standard, and the data from thetribochemically modified stearic acid monolayer surface appearedto be identical to that from a bulk cupric stearate.