Adsorbed gas layers limit the mobility of micropancakes
Adsorbed gas layers limit the mobility of micropancakes
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DOI：
10.1063/1.5113810
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发表时间：
2019-08
影响因子：
4
通讯作者：
H. Teshima;Y. Takata;Koji Takahashi
中科院分区：
文献类型：
--
作者：
H. Teshima;Y. Takata;Koji Takahashi
与表面纳米气泡不同，微煎饼等原子扁平气相的性质尚不清楚。在这项研究中，我们利用高灵敏度的调频原子力显微镜(AFM)研究了高度有序的热解石墨与空气过饱和纯水界面上存在的纳米气相。微薄煎饼出现在无序的气体层上，覆盖在有序的气体层上，并沿着AFM扫描的方向移动。它们的运动停止在无序气层的边缘，而两个气层则完全没有运动。通过假设由强吸附的气体分子组成的无序和有序的气体层的行为类似于固体表面，以及它们之间的表面非均质性导致钉扎效应，解释了微煎饼的有限迁移率。
In contrast to surface nanobubbles, the properties of atomically flat gas phases such as micropancakes remain unclear. In this study, we investigated nanoscopic gas phases existing at the interface between highly ordered pyrolytic graphite and air-supersaturated pure water using high-sensitivity frequency-modulation atomic force microscopy (AFM). Micropancakes appeared on a disordered gas layer overlying an ordered gas layer and moved in the direction of AFM scanning. Their movement stopped at the edge of the disordered gas layers, whereas the two gas layers did not move at all. The limited mobility of micropancakes is explained by assuming that the disordered and ordered gas layers, which are composed of strongly adsorbed gas molecules, behave like solid surfaces, and that the surface heterogeneity between them results in a pinning effect.