Controllable generation of interfacial gas structures on the graphite surface by substrate hydrophobicity and gas oversaturation in water
Controllable generation of interfacial gas structures on the graphite surface by substrate hydrophobicity and gas oversaturation in water
复制标题
通过基底疏水性和水中气体过饱和在石墨表面上可控地生成界面气体结构。
DOI：
10.1039/d2sm00849a
复制
发表时间：
2022-10-10
期刊：
影响因子：
3.4
通讯作者：
Hu, Jun
中科院分区：
文献类型：
--
作者：
Fang, Hengxin;Geng, Zhanli;Hu, Jun
Spherical nanobubbles and flat micropancakes are two typical states of gas aggregation on solid-liquid surfaces. Micropancakes, which are quasi-two-dimensional gaseous structures, are often produced accompanied by surface nanobubbles. Compared with surface nanobubbles, the intrinsic properties of micropancakes are barely understood due to the challenge of the highly efficient preparation and characterization of such structures. The hydrophobicity of the substrate and gas saturation of solvents are two crucial factors for the nucleation and stability of interfacial gas domains. Herein, we investigated the synergistic effect of the surface hydrophobicity and gas saturation on the generation of interfacial gas structures. Different surface hydrophobicities were achieved by the aging process of highly oriented pyrolytic graphite (HOPG). The results indicated that higher surface hydrophobicity and gas oversaturation could create surface nanobubbles and micropancakes with higher efficiency. Strong surface hydrophobicity could promote nanobubble nucleation and higher gas saturation would induce bigger nanobubbles. Degassed experiments could remove most of these structures and prove that they are actually gaseous domains. Finally, we draw a region diagram to describe the formation conditions of nanobubbles, micropancakes based on observations. These results would be very helpful for further understanding the formation of interfacial gas structures on the hydrophobic surface under different gas saturation.
