期刊
SOFT MATTER
卷 12, 期 14, 页码 3303-3309出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5sm02871j
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资金
- Key Laboratory of Interfacial Physics and Technology, Chinese Academy of Sciences
- Open Research Project of the Large Scientific Facility of the Chinese Academy of Sciences: study on Self-assembly Technology and Nanometer Array with Ultra-high Density
- National Natural Science Foundation of China [11079050, 11290165, 11305252, 11575281, U1532260]
- National Basic Research Program of China [2013CB932801]
- National Natural Science Foundation for Outstanding Young Scientists [11225527]
- Shanghai Academic Leadership Program [13XD1404400]
- 973 project [2012CB825705]
- Knowledge Innovation Program of the Chinese Academy of Sciences [U1532260, KJCX2-EW-W09]
The astonishing long lifetime and large contact angles of interfacial nanobubbles are still in hot debate despite numerous experimental and theoretical studies. One hypothesis to reconcile the two abnormalities of interfacial nanobubbles is that they have low surface tensions. However, few studies have been reported to measure the surface tensions of nanobubbles due to the lack of effective measurements. Herein, we investigate the in situ contact angles and surface tensions of individual interfacial nanobubbles immersed in different ethanol aqueous solutions using quantitative nanomechanical atomic force microscopy (AFM). The results showed that the contact angles of nanobubbles in the studied ethanol solutions were also much larger than the corresponding macroscopic counterparts on the same substrate, and they decreased with increasing ethanol concentrations. More significantly, the surface tensions calculated were much lower than those of the gas-liquid interfaces of the solutions at the macroscopic scale but have similar tendencies with increasing ethanol concentrations. Those results are expected to be helpful in further understanding the stability of interfacial nanobubbles in complex solutions.
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