Stable bulk nanobubbles can be regarded as gaseous analogues of microemulsions  

作　　者：Changsheng Chen Hongguang Zhang Xianren Zhang 

机构地区：[1]State Key Laboratory of Organic–Inorganic Composites,Beijing University of Chemical Technology,Beijing 100029,China

出　　处：《Communications in Theoretical Physics》2023年第12期164-173,共10页理论物理通讯（英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.21978007 and 22278013).

摘　　要：In our previous work[2022 Phys.Chem.Chem.Phys.249685],we used molecular dynamics simulations to show that bulk nanobubbles can be stabilized by forming a compressed amphiphile monolayer at bubble interfaces.This observation closely matches the origin of stability of microemulsions and inspired us to propose here that,in certain cases,stable bulk nanobubbles can be regarded as gaseous analogues of microemulsions:the nanobubble phase and the bubble-containing solution phase coexist with the external gas phase.This three-phase coexistence is then validated by molecular dynamics simulations.The stability mechanism for bulk nanobubbles is thus given:the formation of a compressed amphiphilic monolayer because of microbubble shrinking leads to a vanishing surface tension,and consequently the curvature energy of the monolayer dominates the thermodynamic stability of bulk nanobubbles.With the monolayer model,we further interpret several strange behaviors of bulk nanobubbles:gas supersaturation is not a prerequisite for nanobubble stability because of the vanishing surface tension,and the typical nanobubble size of 100 nm can be explained through the small bending constant of the monolayer.Finally,through analyzing the compressed amphiphile monolayer model we propose that bulk nanobubbles can exist ubiquitously in aqueous solutions.

关 键 词：bulk nanobubble stability compressed monolayer three-phase equilibrium 

分 类 号：TB383.1[一般工业技术—材料科学与工程]