Probing the 'Gas tunnel' between neighboring nanobubbles.

07:00 EST 8th November 2019 | BioPortfolio

Summary of "Probing the 'Gas tunnel' between neighboring nanobubbles."

Surface nanobubbles are the main gaseous domains forming at solid-liquid interfaces, their abnormal long lifetime (stability) is still an open question. A hypothesis 'gas tunnel' was presented in a recent simulation study [Acs Nano, 2018, 12(3):2603-2609], which was thought to connect two neighboring nanobubbles and make the nanobubbles remain stable. Herein, we aim to experimentally investigate the existence of 'gas tunnel' and its role on governing nanobubble dynamics. By using an atomic force microscope, mutual effects between different gaseous domains including nanobubbles, nanopancakes and nanobubble-pancake composite on a PS substrate undergoing violent tip perturbation and their effects on the undisturbed neighbors were investigated. The pancake between two nanobubbles can behave as a visible 'gas tunnel' under the tip-bubble interaction. Based on statistical analysis of volume change in the different gas domains, the concept of a generalized 'gas tunnel' is presented and experimentally verified. Nanobubbles surrounded by a water depletion layer which will act as a channel along solid/liquid surfaces for adjacent nanobubbles to communicate each other. Moreover, the change in contact angle of nanobubbles with the concentration of local gas oversaturation was studied, the equilibrium contact angle of nanobubbles is further verified experimentally.


Journal Details

This article was published in the following journal.

Name: Langmuir : the ACS journal of surfaces and colloids
ISSN: 1520-5827


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