Institute of Physics, Academia Sinica, Nankang, Taipei 115, Taiwan.
Langmuir. 2012 Sep 4;28(35):12691-5. doi: 10.1021/la301671a. Epub 2012 Aug 21.
It was numerically predicted that dissolved gas particles could enrich and adsorb at hydrophobic-liquid interfaces. Here we observe nucleation and growth of bright patches of ∼0.45 nm high on the graphite surface in pure water with frequency-modulation atomic force microscopy when the dissolved gas concentration is below the saturation level. The bright patches, suspected to be caused by adsorption of nitrogen molecules at the graphite-water interface, are composed of domains of a rowlike structure with the row separation of 4.2 ± 0.3 nm. The observation of this ordered adlayer might underline the gas segregation at various water interfaces.
有人从数值上预测，溶解气体颗粒可以在疏液-液相界面上富集和吸附。在这里，我们通过调频原子力显微镜观察到，在纯水中，当溶解气体浓度低于饱和水平时，在石墨表面上会形成约 0.45nm 高的亮斑形核和生长。这些亮斑，疑似由氮分子在石墨-水界面上的吸附引起，由具有 4.2 ± 0.3nm 间距的列状结构的畴组成。这种有序吸附层的观察可能强调了各种水界面处的气体分离。
