Spreading of perfluoropolyethers on FDTS-coated amorphous carbon surfaces
Spreading of perfluoropolyethers on FDTS-coated amorphous carbon surfaces
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DOI：
10.1109/tmag.2004.830226
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发表时间：
2004-08
影响因子：
2.1
通讯作者：
Junho Choi;M. Kawaguchi;T. Kato
中科院分区：
文献类型：
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作者：
Junho Choi;M. Kawaguchi;T. Kato
用扫描椭圆偏振仪研究了移动的全氟聚醚（PFPEs）在无定形碳表面包覆1H，1H，2 H，2 H-全氟癸基三氯硅烷（FDTS）岛的铺展性能。FDTS层的平均厚度在0.5至1.4 nm之间变化，并且移动的PFPE的膜厚度为约1.2 nm。我们发现，一个尖锐的“尖峰”上的扩展配置文件发生和尖峰的高度随扩展时间而减小。在部分浸涂之后，具有低表面能的FDTS岛上的PFPE的初始膜边界不能扩散，并且裸碳表面上的移动膜边界被FDTS岛障碍物阻挡，这导致尖峰形成（即，润滑剂积聚）和分子迁移的延迟。这种趋势随着FDTS层的平均膜厚度的增加而显著。在润滑剂前缘处观察到扩散，该扩散源自润滑剂分子通过扩散过程在FDTS岛之间的迁移。
The spreading properties of mobile perfluoropolyethers (PFPEs) on amorphous carbon surfaces coated with 1 H, 1 H, 2 H, 2 H-perfluorodecyltrichlorosilane (FDTS) islands were investigated using a scanning ellipsometer. The average thicknesses of the FDTS layers varied from 0.5 to 1.4 nm and the film thickness of the mobile PFPEs was about 1.2 nm. We find that a sharp "spike" on the spreading profile occurs and the height of the spike decreases with the spreading time. After partial dip-coating, the initial film boundary of the PFPE on the FDTS islands having a low surface energy cannot spread and the moving film boundary on the bare carbon surface is obstructed by the FDTS island obstacles, which results in the spike formation (i.e., the lubricant buildup) and the retardation of molecular migration. This tendency is remarkable with the increasing average film thickness of the FDTS layer. The spreading is observed at the leading edge of the lubricant front originating from the migration of the lubricant molecules between the FDTS islands by diffusive processes.