Ultrahigh vacuum techniques in the measurement of contact angles. IV. Water on graphite (0001)
Ultrahigh vacuum techniques in the measurement of contact angles. IV. Water on graphite (0001)
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DOI：
10.1021/j100590a013
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发表时间：
1975-11
期刊：
影响因子：
--
通讯作者：
M. Schrader
中科院分区：
文献类型：
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作者：
M. Schrader
发现抽真空至10-1托十倍的定向石墨的(0001)表面上的水的接触角为35±4。与抽真空前表面的 50-80 范围内的值相比，该值要低得多且更具可重复性。疏散前发现的较高值显然是由于疏水性有机污染造成的。真空表面的离子轰击将接触角减小至 0。所有真空接触角测量均在原位进行，并通过俄歇电子能谱监测表面清洁度。接触角从抽真空后的约 35 度减小到离子轰击后的 0 度，这是由于化学吸附的氢或碳氢化合物（AES 无法检测到）的去除，或者是由于清洁 (0001) 表面的六边形结构混乱而产生高能表面位点。提出石墨(0001)的润湿性与其导电性能有关。
The contact angle of water on the (0001) surface of oriented graphite evacuated to the 10-1 Torr decade is found to be 35±4. The value is considerably lower and more reproducible than those in the range of 50-80 found for the surface prior to evacuation. The higher values found before evacuation are apparently due tohydrophobic organic contamination. Ion bombardment of the evacuated surface reduces the contact angle to 0. All vacuum contact angle measurements are made in situ with surface cleanliness monitored by Auger electron spectroscopy. The decrease in contact angle from the value of approximately 35 after evac-uation to that of 0 after ion bombardment is due either to removal of chemisorbed hydrogen or hydrocarbon (not detectable by AES), or to disarrangement of the hexagonal structure of a clean (0001) surface to yield high-energy surface sites. It is proposed that the wettability of graphite (0001) is related to its con-ducting properties.