动态力显微镜中吸引相互作用引起的耗散：吸附水层的贡献
Dissipation induced by attractive interaction in dynamic force microscopy : contribution of adsorbed water layers
摘要：
在室温和环境条件下，由于吸附，水膜总是存在于二氧化硅表面上。如果在接触模式下使用扫描探针方法研究表面，则会导致在尖端和表面之间形成弯月面。该液体颈在纳米尖端和表面之间产生额外的毛细力。在动态模式下，由于表面上的振荡尖端的作用，吸附水层的机械响应可以引起通过振荡器的相位变化探测的额外耗散。在目前的工作中，我们分析了动态力显微镜上的二氧化硅表面上的水膜的生长作为时间的函数。首先清洁二氧化硅样品并在$420^\circ$ C下加热，然后暴露于干燥条件。水膜的影响检查与动态模式，通过使用间歇接触和非接触的情况。为了描述实验观察，额外的耗散被考虑到当尖端接近表面。拟合的结果允许评估由尖端和二氧化硅表面之间的吸引力相互作用引起的耗散，该相互作用与水分子在表面上的吸附相关，作为时间的函数。结果进行比较，以前的摩擦学研究中进行接触模式和红外光谱测量的二氧化硅的关键参数是表面温度，而不是时间。两个实验结果吻合得很好。
英文摘要：
At room temperature and under ambient conditions, due to the adsorption, a water film is always present on silica surfaces. If the surface is investigated with a scanning probe method in Contact mode, this causes the formation of a meniscus between the tip and the surface. This liquid neck generates additional capillary forces between the nano-tip and the surface. In dynamic mode, due to the action of the oscillating tip on the surface, the mechanical response of the adsorbed water layers can induce additional dissipation that is probed through the phase variations of the oscillator. In the present work, we analyze by dynamic force microscopy the growth of a water film on a silica surface as a function of time. The silica sample is first cleaned and heated at $420^\circ$C, then is exposed to dry conditions. The influence of the water film is checked with the dynamic mode by using intermittent contact and noncontact situations. To describe the experimental observations, additional dissipation is taken into account when the tip approaches the surface. The results of the fits allow the evaluation of the dissipation induced by the attractive interaction between the tip and the silica surface related to the adsorption of water molecules on surface as a function of time. Results are compared to previous tribological studies performed in Contact mode and infra-red spectroscopy measurements on the silica for which the key parameter was the surface temperature instead of time. The two experimental results are in good agreement.
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