1] Interdisciplinary Nanoscience Center (iNANO), Aarhus University, Aarhus C DK-8000, Denmark [2] School of Physical Science and Technology, Lanzhou University, Lanzhou 730000, China [3].
1] Interdisciplinary Nanoscience Center (iNANO), Aarhus University, Aarhus C DK-8000, Denmark [2].
Nat Commun. 2014 Sep 8;5:4837. doi: 10.1038/ncomms5837.
The precipitation products (rain, snow and so on) of atmospheric water vapour are widely prevalent, and yet the map of its initial stage at a surface is still unclear. Here we investigate the condensation of water vapour occurring in both the hydrophobic-hydrophilic interface (graphene/mica) and the hydrophilic-hydrophilic interface (MoS2/mica) by in situ thermally controlled atomic force microscopy. By monitoring the dynamic dewetting/rewetting transitions process, the ice-like water adlayers, at the hydrophobic-hydrophilic interface and not at the hydrophilic-hydrophilic interface, stacked on top of each other up to three ice-Ih layers (each of height 3.7 ± 0.2 Å), and the transition from layers to droplets was directly visualized experimentally. Compared with molecular dynamics simulation, the Stranski-Krastanov growth model is better suited to describe the whole water condensation process at the hydrophobic-hydrophilic interface. The initial stage of the hydrometeor is rationalized, which potentially can be utilized for understanding the boundary condition for water transport and the aqueous interfacial chemistry.
大气水汽的降水产物（雨、雪等）广泛存在，但在地表其初始阶段的图谱仍不清楚。本研究通过原位热控原子力显微镜研究了发生在疏水-亲水界面（石墨烯/云母）和亲水-亲水界面（MoS2/云母）的水汽凝结。通过监测动态去湿/再湿转变过程，发现疏水-亲水界面而非亲水-亲水界面上存在堆积至三层冰-Ih 层（每层高度 3.7 ± 0.2 Å）的类冰水吸附层，实验上直接观察到从层到液滴的转变。与分子动力学模拟相比，Stranski-Krastanov 生长模型更适合描述疏水-亲水界面上水凝结的整个过程。合理地解释了水凝物的初始阶段，这可能有助于理解水输运的边界条件和水相界面化学。
