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Bulk Nanobubbles Fabricated by Repeated Compression of Microbubbles
Juan Jin1, Zhenqiang Feng1, Fang Yang1
1State Key Laboratory of Bioelectronics, Jiangsu Key Laboratory for Biomaterials and Devices, School of Biological Sciences and Medical Engineering , Southeast University , Sipailou 2 , Nanjing , Jiangsu 210009 , P. R. China.
Langmuir : the ACS Journal of Surfaces and Colloids
|March 1, 2019
Summary
Researchers developed a novel pressure-driven method to create stable bulk nanobubbles (NBs) using sulfur hexafluoride gas. This technique yields highly concentrated, long-lasting NBs, offering potential for diverse nanotechnology applications.
Area of Science:
- Nanotechnology
- Materials Science
- Physical Chemistry
Background:
- Nanobubbles (NBs) exhibit unique properties, attracting significant research interest.
- Generating stable bulk NBs, unlike surface NBs, presents considerable challenges with current methods.
Purpose of the Study:
- To develop an effective method for preparing stable bulk nanobubbles.
- To investigate the formation mechanism of nanobubbles using this new technique.
Main Methods:
- A pressure-driven method involving repeated compression of sulfur hexafluoride (SF6) gas into water.
- Characterization using optical microscopy and attenuated total reflectance Fourier transform infrared (ATR-FTIR) spectroscopy.
Main Results:
- Successfully prepared bulk NBs with a mean diameter of 240 ± 9 nm and a polydispersity index of 0.25.
- Achieved high negative zeta potential (-40 ± 2 mV) and stability exceeding 48 hours.
- Reached a concentration of 1.92 × 1010 bubbles/mL after 600 compression cycles.
Conclusions:
- The repeated gas compression method is effective for producing stable bulk nanobubbles.
- Microbubble shrinkage and enhanced hydrogen bonding at the gas-water interface are key to nanobubble formation and stability.
- This method offers a promising route for scalable nanobubble production for future applications.
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