Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 12, Issue 15, Pages 18110-18115Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.0c00464
Keywords
unidirectional bubble transport; directional bubble collection; Janus foam; ultrafast laser; wetting gradient force
Funding
- National Natural Science Foundation of China [51875544, 61505047, 61805230]
- Fundamental Research Funds for the Central Universities [WK2090090025, JZ2017YYPY0240]
- National Key R&D Program of China [2017YFB1104303]
- China Postdoctoral Science Foundation [2018M642534]
- Experimental Center of Engineering and Material Sciences at USTC
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Manipulating gas bubbles in aqueous ambient is of great importance for applications in water treatment, gas collection, and matter transport. Here, a kind of Janus foam is designed and fabricated by one-step ultrafast laser ablation of one side of the copper film, which is treated to be superhydrophobic. Janus foam exhibits not only the capability of unidirectional transport of underwater bubbles but also gas collection with favorable efficiency up to similar to 15 mL cm(-2) min(-1). The underlying physical mechanism is attributed to the cooperation of the buoyancy, adhesion, and wetting gradient forces imposed on the bubbles. As a paradigm, the underwater chemical reaction between the unidirectional CO2 gas flow and the alkaline phenolphthalein solution is demonstrated via Janus foam. This facile and low-cost fabrication approach for Janus foam will find broad potential applications in effective bubble transport, carbon capture, and controllable chemical reactions under aqueous conditions.
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