粗糙度对亲水表面间毛细力的影响
Influence of roughness on capillary forces between hydrophilic surfaces
摘要：
毛细管力已被测量的原子力显微镜在金，硼硅酸盐玻璃，GeSbTe，钛，和UV照射的无定形二氧化钛表面之间的板球设置。力测量作为接触时间和表面粗糙度在0.2 - 15 nm rms范围内以及相对湿度在2 - 40%范围内的函数进行。发现即使对于可达到的最低相对湿度2%，仍然存在非常大的毛细力。后者表明纳米厚的吸附水层的持久性，作为接触表面之间的毛细桥。此外，我们发现了一个显着不同的缩放行为的力与均方根粗糙度的材料具有不同的亲水性相比，金-金表面。
英文摘要：
Capillary forces have been measured by Atomic Force Microscopy in the plate-sphere setup between gold, borosilicate glass, GeSbTe, titanium, and UV irradiated amorphous titaniumdioxide surfaces. The force measurements were performed as a function contact time and surface roughness in the range 0.2 - 15 nm rms, and relative humidity ranging between 2 and 40 %. It is found that even for the lowest attainable relative humidity 2 % very large capillary forces are still present. The latter suggests the persistence of a nanometers thick adsorbed water layer that acts as a capillary bridge between contacting surfaces. Moreover, we found a significantly different scaling behavior of the force with rms roughness for materials with different hydrophilicity as compared to gold-gold surfaces.
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