Interfacial Micropancakes: Gas or Contaminations?,Langmuir

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Interfacial Micropancakes: Gas or Contaminations?
Langmuir ( IF 3.7 ) Pub Date : 2022-06-17 , DOI: 10.1021/acs.langmuir.2c00390
Hengxin Fang _{1,

2} , Juncheng Qi _{1,

2} , Yao Wang _{1,

2} , Kaiwei Yuan _{1,

2} , Lijuan Zhang _{1,

2,

3} , Jun Hu _{1,

2,

3}

Affiliation

Micropancake, a flat domain with micrometer-scale lateral size and a few nanometer thickness, is usually accompanied by the generation of interfacial nanobubbles at the liquid/solid surfaces. Unlike the nanobubbles, micropancakes are difficult to be produced efficiently, impeding further investigations of their mysterious properties. Very recently, An et al. even argued that the previously observed micropancakes were most likely the contaminate, not the gas layers. Herein, to reveal the nature of micropancakes with solid evidence, we presented the in situ characterization of micropancakes at a highly oriented pyrolytic graphite (HOPG) surface produced by the ethanol–water exchange or gas-supersaturated water. By washing with deeply degassed water (DW), the dissolution of those micropancakes was clearly observed, indicating that they may very well be composed of gas. In addition, the analysis of the force measurements showed the intrinsic differences between those gaseous micropancakes and the insoluble organic films. The data and results supported the interpretation that the real existence of gas micropancakes at liquid/solid surfaces.

中文翻译：

界面微煎饼：气体还是污染物？

Micropancake 是一种具有微米级横向尺寸和几纳米厚度的平坦区域，通常伴随着在液体/固体表面产生界面纳米气泡。与纳米气泡不同，微煎饼很难有效生产，阻碍了对其神秘特性的进一步研究。最近，An 等人。甚至认为先前观察到的微型煎饼很可能是污染物，而不是气体层。在这里，为了用确凿的证据揭示微煎饼的性质，我们在现场展示了在由乙醇-水交换或气体过饱和水产生的高度取向的热解石墨 (HOPG) 表面上表征微型煎饼。通过用深度脱气水（DW）洗涤，可以清楚地观察到这些微煎饼的溶解，表明它们很可能是由气体组成的。此外，对力测量的分析显示了这些气态微煎饼和不溶性有机薄膜之间的内在差异。数据和结果支持了气体微饼在液体/固体表面真实存在的解释。

更新日期：2022-06-17

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