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The properties of surface nanobubbles formed on different substrates |
| Zheng-Lei Zou(邹正磊)1,3, Nan-Nan Quan(权楠楠)1,3, Xing-Ya Wang(王兴亚)3,4, Shuo Wang(王硕)2,4, Li-Min Zhou(周利民)2,4, Jun Hu(胡钧)2, Li-Juan Zhang(张立娟)3, Ya-Ming Dong(董亚明)1 |
1 Life and Environment Science College, Shanghai Normal University, Shanghai 200234, China;
2 Key Laboratory of Interfacial Physics and Technology, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China;
3 Shanghai Synchrotron Radiation Facility, Shanghai 201204, China;
4 University of Chinese Academy of Sciences, Beijing 100049, China |
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Abstract The properties and stability of the reported surface nanobubbles are related to the substrate used and the generation method. Here, we design a series of experiments to study the influence of the hydrophobicity of the substrate and the production method on the formation and properties of nanobubbles. We choose three different substrates, dodecyltrichlorosilane (DTS) modified silicon, octadecyltrichlorosilane (OTS) modified silicon, and highly oriented pyrolytic graphite (HOPG) as nanobubble substrates, and two methods of ethanol-water exchange and 4-℃ cold water to produce nanobubbles. It is found that using ethanol-water exchange method could produce more and larger nanobubbles than the 4-℃ cold water method. The contact angle of nanobubbles produced by ethanol-water exchange depends on the hydrophobicity of substrates, and decreases with the increase of the hydrophobicity of substrates. More interestingly, nanoscopic contact angle approaches the macroscopic contact angle as the hydrophobicity of substrates increases. It is believed that these results would be very useful to understand the stability of surface nanobubbles.
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Received: 23 March 2018
Revised: 30 May 2018
Accepted manuscript online:
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PACS:
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68.08.Bc
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(Wetting)
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81.07.-b
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(Nanoscale materials and structures: fabrication and characterization)
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68.37.Ps
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(Atomic force microscopy (AFM))
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81.65.-b
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(Surface treatments)
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| Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 11290165, 11305252, and U1532260), the Knowledge Innovation Program of the Chinese Academy of Sciences, China (Grant No. KJZD-EW-M03), and the Key Research Program of Frontier Sciences, Chinese Academy of Sciences, China (Grant No. QYZDJ-SSW-SLH019). |
Corresponding Authors:
Li-Juan Zhang, Ya-Ming Dong
E-mail: zhanglijuan@sinap.ac.cn;ymdong@shnu.edu.cn
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Cite this article:
Zheng-Lei Zou(邹正磊), Nan-Nan Quan(权楠楠), Xing-Ya Wang(王兴亚), Shuo Wang(王硕), Li-Min Zhou(周利民), Jun Hu(胡钧), Li-Juan Zhang(张立娟), Ya-Ming Dong(董亚明) The properties of surface nanobubbles formed on different substrates 2018 Chin. Phys. B 27 086803
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