Wetting and capillary phenomena of water on mica

被引:249
作者
Xu, L
Lio, A
Hu, J
Ogletree, DF
Salmeron, M [1 ]
机构
[1] Univ Calif Berkeley, Lawrence Berkeley Lab, Div Sci Mat, Berkeley, CA 94720 USA
[2] Chinese Acad Sci, Shanghai Inst Nucl Res, Shanghai 201800, Peoples R China
来源
JOURNAL OF PHYSICAL CHEMISTRY B | 1998年 / 102卷 / 03期
关键词
D O I
10.1021/jp972289l
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The structure of water films on mica was locally modified by contact with the tip of an atomic force microscope (AFM) in a humid environment. The subsequent evolution of the film was studied by noncontact scanning polarization force microscopy. At high relative humidity (>20%), capillary condensation caused water to form droplets and two-dimensional islands around the contact point. The droplets evaporated in a short period of time, but the islands remained for much longer periods (hours). At low relative humidity (>20%), the tip contact produced a circular depression in the local polarizability. None of these structures could be observed in contact AFM images which revealed only the usual atomically flat mica surface.
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页码:540 / 548
页数:9
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