Journal
NANO LETTERS
Volume 20, Issue 7, Pages 5513-5521Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.0c02091
Keywords
gas bubbles; ferrofluid; femtosecond laser; slippery surfaces; bubble manipulation
Categories
Funding
- National Natural Science Foundation of China [61475149, 51805508, 51675503, 51875544, 61805230, 51805509, 11772327]
- Fundamental Research Funds for the Central Universities [WK 2090090012, WK2480000002, WK2090090021]
- Youth Innovation Promotion Association CAS [2017495]
- Chinese Academy of Sciences Instrument Project [YZ201566]
- National Key R&D Pr o g r a m o f China [2017YFB1104303, 2018YFB1105400]
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Manipulation of gas bubbles in an aqueous ambient environment is fundamental to both academic research and industrial settings. Present bubble manipulation strategies mainly rely on buoyancy or Laplace gradient forces arising from the sophisticated terrain of substrates. However, these strategies suffer from limited manipulation flexibility such as slow horizontal motion and unidirectional transport. In this paper, a high performance manipulation strategy for gas bubbles is proposed by utilizing ferrofluid-infused laser-ablated microstructured surfaces (FLAMS). A typical gas bubble (<2 mu L) can be accelerated at >150 mm/s(2) and reach an ultrafast velocity over 25 mm/s on horizontal FLAMS. In addition, diverse powerful manipulation capabilities are demonstrated including antibuoyancy motion, freestyle writing, bubble programmable coalescence, three-dimensional (3-D) controllable motion and high towing capacity of steering macroscopic object (>500 own mass) on the air-water interface. This strategy shows terrain compatibility, programmable design, and fast response, which will find potential applications in water treatment, electrochemistry, and so on.
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