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Role of substrate softness in stabilizing surface nanobubbles

Green Energy & Environment 2020年第3期5卷 374-380页

作者： Changsheng Chen Xianren Zhang Dapeng Cao State Key Laboratory of Organicinorganic Composites Beijing University of Chemical TechnologyBeijing100029China

The contact line pinning and supersaturation theory for the nanobubble stability has attracted extensive concerns from experimental investigators,and some experimenters argue that the contact line pinning is unnecessary.To interpret the experimental observations,we have proposed previously through molecular dynamics simulations that the deformation of soft substrates caused by surface nanobubbles may play an important role in stabilizing surface nanobubbles,while yet no quantitative theory is available for explanation of this mechanism.Here,the detailed mechanism of self-pinning-induced stability of surface nanobubbles is investigated through theoretical analysis.By manipulating substrate softness,we find that the formation of surface nanobubbles may create a deformation ridge nearby their contact lines which leads to the self-pinning effect.Theoretical analysis shows that the formation of nanobubbles on sufficiently rigid substrates or on liquid-liquid interfaces corresponds to a local free energy maximum,while that on the substrates with intermediate softness corresponds to a local minimum.Thus,the substrate softness could regulate the surface nanobubble stability.The critical condition for the self-pinning effect is determined based on contact line depinning,and the effect of gas supersaturation is explored.Finally,the approximate stability range for the surface nanobubbles is also predicted.

关键词： surface nanobubble Soft substrate Stability Self-pinning

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A review of recent theoretical and computational studies on pinned surface nanobubbles

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Chinese Physics B 2018年第1期27卷 136-144页

作者：刘亚伟张现仁 State Key Laboratory of Organic-Inorganic Composites Beijing University of Chemical Technology

The observations of long-lived surface nanobubbles in various experiments have presented a theoretical challenge, as they were supposed to be dissolved in microseconds owing to the high Laplace pressure. However, an increasing number of studies suggest that contact line pinning, together with certain levels of oversaturation, is responsible for the anomalous stability of surface nanobubbles. This mechanism can interpret most characteristics of surface nanobubbles. Here, we summarize recent theoretical and computational work to explain how the surface nanobubbles become stable with contact line pinning. Other related work devoted to understanding the unusual behaviors of pinned surface nanobubbles is also reviewed here.

关键词： surface nanobubble contact line pinning oversaturation lattice density functional theory

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维普期刊数据库

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Identification of surface nanobubbles and resolving their size-dependent stiffness

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Science China(Physics,Mechanics & Astronomy) 2020年第9期63卷 66-76页

作者： YouQuan Jia BinYu Zhao Abbasali Abouei Mehrizi Chuan Wang Yi Xu LongQuan Chen School of Mechanics and Engineering Southwest Jiaotong UniversityChengdu 610031China School of Physics University of Electronic Science and Technology of ChinaChengdu 610054China Leibniz Institute of Polymer Research Dresden Dresden 01069Germany

We report a comparative investigation of the topographic features and nanomechanical responses of surface nanobubbles,polymeric nanodrops,and solid microparticles submerged in water and probed by atomic force microscopy in different operating modes.We show that these microscopic objects exhibit similar topographies,either hemispherical or hemiellipsoidal,in the standard tapping mode,and thus are difficult to distinguish.However,distinct differences,caused not only by their different mechanical properties but also by different cantilever tip-sample mechanical interactions that are affected by tip wettability,were observed in successive topographic imaging with controlled scanning forces and the nanoindentation tests,allowing for the identification of surface nanobubbles.Based on the indentation force-distance curves,we further extrapolated the stiffness of surface nanobubbles spanning a wide range of sizes and then developed a simple theoretical model to explain this size dependence.We also demonstrate how size-dependent stiffness can be used to determine the surface tension of nanobubbles,which was found to be much lower than the bulk value of water.

关键词： surface nanobubble size-dependent stiffness nanomechanical measurement atomic force microscopy

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Label-free optical imaging of the dynamic stick-slip and migration of single sub-100nm surface nanobubbles: A super-localization approach

Label-free optical imaging of the dynamic stick-slip and mig...

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中国化学会第十三届全国分析化学年会

作者： Yongjie Wang Jing Chen Yingyan Jiang Xian Wang Hong-Yuan Chen Wei Wang State Key Laboratory of Analytical Chemistry for Life Science School of Chemistry and Chemical Engineering Nanjing University

surface nanobubbles are nanoscopic spherical-cap-shaped gaseous cavities on immersed substrate. The dissolution dynamics of nanobubbles at hydrophobic surface/water interface are important in various chemical and environmental process, but the dissolution mode of a surface nanobubble is still controversial [1]. In this work, we apply surface Plasmon Resonance（SPR） microscopy to study the dynamic dissolution of carbon dioxide nanobubbles at hydrophobic（octadecanethiol modified） surface/water interface and track its 2D displacement by Gaussian fitting. Unlike other techniques used to study nanobubbles, such as AFM[2], TEM[3],etc, SPR is highly sensitive to the change of refractive index on surface and can in-situ, nondestructively detect the dissolution procedure of nanobubbles, which is particularly suitable for investigating the dissolution process of nanobubbles. Compared to other optical microscopy [1, 4], SPRM has a clear advantage in sensitivity, signal-noise ratio, and resolution. The formation of nanobubbles at hydrophobic surface/water interface can be easily induced by solvent exchange procedure [5].

关键词： surface nanobubble SPRM 2D localization

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