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Application of the Diffused Double Layer Theory to Nanobubbles
Jay N Meegoda1, Shaini Aluthgun Hewage1, Janitha H Batagoda1
1Department of Civil & Environmental Engineering , New Jersey Institute of Technology , 323 Dr M.L.K. Jr. Blvd. , Newark , New Jersey 07102 , United States.
Langmuir : the ACS Journal of Surfaces and Colloids
|August 22, 2019
Summary
The study found that 0.001 M NaCl concentration yields the most stable oxygen nanobubbles by preventing coalescence. Higher NaCl concentrations decreased nanobubble stability and increased their size.
Area of Science:
- Colloid and Surface Science
- Physical Chemistry
- Nanotechnology
Background:
- Nanobubbles possess electrically charged interfaces, allowing the application of diffuse double layer theory.
- Understanding nanobubble behavior in electrolytic solutions is crucial for various applications.
Purpose of the Study:
- To investigate the effect of NaCl concentration on oxygen nanobubble stability.
- To analyze nanobubble size, zeta potential, and surface charge density.
- To compute interaction energy and internal pressure using diffuse double layer theory.
Main Methods:
- Generation of oxygen nanobubbles in NaCl solutions of varying concentrations.
- Measurement of bubble size and zeta potential immediately after generation and after one week.
- Application of diffuse double layer theory to calculate surface charge density, surface potential, and interaction energy.
Main Results:
- Increased NaCl concentration led to larger bubble size, higher surface charge density, and more negative charges.
- Higher NaCl concentrations decreased zeta potential magnitude, double layer thickness, internal pressure, and electrostatic repulsion.
- A 0.001 M NaCl solution exhibited a significant energy barrier preventing bubble coalescence, indicating high stability.
Conclusions:
- The 0.001 M NaCl solution provides the most stable nanobubbles due to electrostatic repulsion preventing coalescence.
- Increased NaCl concentration reduces nanobubble stability and interfacial pressure difference.
- Nanobubble stability is inversely related to NaCl concentration.
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