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The tribological properties of perfluoro and non-perfluoro alkylsilane molecular films were investigated and compared detailedly.
Their surface properties were characterized by X-ray photoelectron spectroscopy (XPS), atomic force microscopy (AFM) and contact
angle (CA) measurement. A ball-on-disk tribometer was used to study the frictional properties of these alkylsilane monolayers.
The experimental results reveal that the alkylsilane molecular films are good candidates to decrease friction and they have
good capability to endure rigorous shear forces. Perfluoro alkylsilane molecular films are bonded better with the Si substrate
than the simple hydrocarbon ones. The effects of sliding velocity and normal load on friction coefficient are evident and
the friction coefficient increases with the increase of the sliding velocity. However, friction coefficient decreases with
the increase of normal load initially and then increases, indicating there exists a critical normal load for the load effect.
Funded by the National Natural Science Foundation of China (No.50730007 and 50805086), the Foundation of Tsighua Basic Research,
and the National Key Basic Research Program of China(No. 2007CB607604) 相似文献
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介绍了一种用极谱催化波间接测定硫酸根的方法,讨论了实验条件和干扰因素.方法简便,选择性好,测定范围宽. 相似文献
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文[1]采用了一种基于动态模型的聚类算法,将时序基因表达数据作为一组时间序列进行动态的聚类分析,得到了较为理想的聚类结果。对上述算法在数据初始化方面进行了合理改进,并利用贝叶斯理论对数据的联合概率分布进行了重新分析。实验表明,提出的改进算法所得聚类结果明显优于原算法所得结果。 相似文献
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