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Updated: Jul 3, 2025
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Quantitative and Qualitative Examination of Particle-particle Interactions Using Colloidal Probe Nanoscopy
Published on: July 18, 2014
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Understanding the Role of Surface Charge on Nanobubble Capillary Bridging during Particle-Particle Interaction
Nilanjan Dutta1, Subhasish Mitra2, Neelkanth Nirmalkar1
1Department of Chemical Engineering, Indian Institute of Technology Ropar, Punjab 140001, India.
Langmuir : the ACS Journal of Surfaces and Colloids
|February 15, 2024
Summary
Particle interactions driven by hydrophobic forces are enhanced when nanobubble surface charge is near neutral. This occurs because neutral nanobubbles promote capillary bridge formation, increasing particle aggregation.
Area of Science:
- Colloid and Surface Science
- Physical Chemistry
- Nanotechnology
Background:
- Hydrophobic forces mediate particle interactions, often attributed to capillary forces from merging nanobubbles.
- Nanobubble surface charge is a critical factor influencing capillary bridge formation and stability.
Purpose of the Study:
- To investigate how nanobubble surface charge affects capillary bridge formation.
- To determine the impact of altered nanobubble surface charge on particle-particle interactions.
Main Methods:
- Nanobubble surface charge was modified using various surfactants and salts.
- Particle-particle interaction was quantified by measuring the aggregate size of hydrophobized glass particles.
- Experimental and theoretical approaches were employed to analyze nanobubble behavior and interactions.
Main Results:
- Particle interactions were significantly enhanced when nanobubble surface potential approached the neutral regime.
- Minimal surface charge density along the capillary bridge interface correlated with increased bridge stability.
- Electrostatic repulsion was overcome by nanobubble interactions near neutral potential, favoring capillary bridge formation.
Conclusions:
- Nanobubble surface charge plays a crucial role in mediating hydrophobic interactions between particles.
- Optimizing nanobubble surface potential towards neutral conditions can enhance particle aggregation via stable capillary bridges.
- Understanding these surface charge effects is key for controlling colloidal systems and interfacial phenomena.
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