Muramatsu Hiroshi, Yamamoto Yuji, Shigeno Masatsugu, Shirakawabe Yoshiharu, Inoue Akira, Kim Woo-Sik, Kim Seung Jin, Chang Sang-Mok, Kim Jong Min
School of Bionics, Tokyo University of Technology, 1404-1 Katakura, Hachioji, Tokyo 192-0982, Japan.
Anal Chim Acta. 2008 Mar 24;611(2):233-8. doi: 10.1016/j.aca.2008.01.086. Epub 2008 Feb 15.
We have fabricated polymer tips for atomic force microscopy in order to elucidate the effects of tip length and shape on cantilever vibration damping in liquids. The vibration damping is investigated by measuring the vibration amplitude of cantilevers as a function of tip-sample distance. The cantilever with a short tip provides a higher damping effect over long tip-sample distances. When the vibration amplitude was rescaled to show the effect of the cantilever width on oscillation damping, the vibration amplitude of cantilevers with various tip lengths was similarly obtained in a long distance range over 50 microm. This similarity is explained by an acoustic damping model in which an acoustic wave is generated by the cantilever. Finally, the results indicate a cantilever with a sufficiently long tip compared to the cantilever width can dramatically reduce the long-range damping effect in a liquid environment.
我们制造了用于原子力显微镜的聚合物探针，以阐明探针长度和形状对液体中悬臂梁振动阻尼的影响。通过测量悬臂梁的振动幅度作为探针 - 样品距离的函数来研究振动阻尼。短探针的悬臂梁在长探针 - 样品距离上提供更高的阻尼效果。当重新缩放振动幅度以显示悬臂梁宽度对振荡阻尼的影响时，在超过50微米的长距离范围内，类似地获得了具有不同探针长度的悬臂梁的振动幅度。这种相似性由一个声学阻尼模型解释，在该模型中，悬臂梁会产生声波。最后，结果表明，与悬臂梁宽度相比，具有足够长探针的悬臂梁可以显著降低液体环境中的长程阻尼效果。
