Influence of ultrathin water layer on the van der Waals/Casimir force between gold surfaces
Influence of ultrathin water layer on the van der Waals/Casimir force between gold surfaces
复制标题
超薄水层对金表面间范德华力/卡西米尔力的影响
DOI：
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发表时间：
2009
期刊：
影响因子：
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通讯作者：
P. V. Zwol
中科院分区：
文献类型：
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作者：
G. Palasantzas;V. Svetovoy;P. V. Zwol
本文研究了超薄水层(∼1-1.5 nm)对金表面范德华/卡西米尔力的影响。吸附实验表明，在环境条件下，金表面不可避免地存在着吸附的水，因为在附着力实验过程中会发生跳跃接触。在没有水层的情况下，基于Lifshitz理论的计算与实验很好地吻合了d≳10 nm的表面分离。然而，力测量中的误差允许厚度为h≲1.5 nm的层。在较短的间隔，d≲10 nm，水层可能会有很大的影响，计算表明，对于平面。然而，在现实中，表面粗糙度的影响也必须被考虑，它可以盖过与总球板均方根粗糙度wshp+w相当的间隔处的任何水层影响。
In this paper we investigate the influence of ultrathin water layer (∼1–1.5 nm) on the van der Waals/Casimir force between gold surfaces. Adsorbed water is inevitably present on gold surfaces at ambient conditions as jump-up-to contact during adhesion experiments demonstrate. Calculations based on the Lifshitz theory give very good agreement with the experiment in the absence of any water layer for surface separations d≳10 nm. However, a layer of thickness h≲1.5 nm is allowed by the error margin in force measurements. At shorter separations, d≲10 nm, the water layer can have a strong influence as calculations show for flat surfaces. Nonetheless, in reality the influence of surface roughness must also be considered, and it can overshadow any water layer influence at separations comparable to the total sphere-plate rms roughness wshp+w.