Growth dynamics and gas transport mechanism of nanobubbles in graphene liquid cells

Dongha Shin, Jong Bo Park, Yong-Jin Kim, Sang Jin Kim, Jin Hyoun Kang, Bora Lee, Sung-Pyo Cho (), Byung Hee Hong () and Konstantin S Novoselov
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Dongha Shin: College of Natural Science, Seoul National University
Jong Bo Park: College of Natural Science, Seoul National University
Yong-Jin Kim: College of Natural Science, Seoul National University
Sang Jin Kim: College of Natural Science, Seoul National University
Jin Hyoun Kang: College of Natural Science, Seoul National University
Bora Lee: College of Natural Science, Seoul National University
Sung-Pyo Cho: National Center for Inter-University Research Facilities, Seoul National University
Byung Hee Hong: Graduate School of Convergence Science and Technology, Seoul National University
Konstantin S Novoselov: University of Manchester

Nature Communications, 2015, vol. 6, issue 1, 1-6

Abstract: Abstract Formation, evolution and vanishing of bubbles are common phenomena in nature, which can be easily observed in boiling or falling water, carbonated drinks, gas-forming electrochemical reactions and so on. However, the morphology and the growth dynamics of the bubbles at nanoscale have not been fully investigated owing to the lack of proper imaging tools that can visualize nanoscale objects in the liquid phase. Here, we demonstrate for the first time that the nanobubbles in water encapsulated by graphene membrane can be visualized by in-situ ultra-high vacuum transmission electron microscopy. Our microscopic results indicate two distinct growth mechanisms of merging nanobubbles and the existence of a critical radius of nanobubbles that determines the unusually long stability of nanobubbles. Interestingly, the gas transport through ultrathin water membranes at nanobubble interface is free from dissolution, which is clearly different from conventional gas transport that includes condensation, transmission and evaporation.

Date: 2015
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DOI: 10.1038/ncomms7068

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