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The roles of particles in multiphase processes: Particles on bubble surfaces
Ghislain Bournival1, Seher Ata1, Erica J Wanless2
1The School of Mining Engineering, The University of NSW, Sydney, NSW 2052, Australia.
Particles significantly impact bubble stability in foams, influencing industrial processes like froth flotation. Particle properties affect bubble coalescence and detachment dynamics, offering avenues for advanced material design.
Area of Science:
- Colloid and Surface Science
- Materials Science
- Chemical Engineering
Background:
- Particle-stabilised foams are crucial in industrial applications such as froth flotation.
- Bubble coalescence is a key factor in foam metastability, driven by energy minimization.
- Particles adsorbed onto bubble surfaces can significantly alter foam stability and dynamics.
Purpose of the Study:
- To review the effects of particles on bubble surfaces and foam stability.
- To explore the mechanisms by which particles influence bubble coalescence.
- To examine the impact of particle physicochemical properties on foam behavior.
Main Methods:
- Literature survey on particle-stabilised foams and bubble coalescence.
- Analysis of particle effects on bubble surface properties and stability.
- Investigation of particle detachment mechanisms during bubble coalescence.
Main Results:
- Particle characteristics, including hydrophobicity and size, profoundly affect bubble stability.
- Particles can prevent coalescence through steric hindrance or by modifying surface dynamics.
- Bubble surface oscillations during coalescence can influence particle detachment, often related to three-phase contact line dynamics.
Conclusions:
- Particle-stabilised foams exhibit complex behaviors influenced by particle properties and interfacial dynamics.
- Understanding particle-bubble interactions is vital for optimizing industrial foam processes.
- Further computational studies are needed to fully elucidate the dynamic processes of bubble coalescence and particle detachment.
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