Pickering foams and parameters influencing their characteristics

Area of Science:

• Colloid and Surface Science
• Materials Science
• Chemical Engineering

Background:

• Pickering foams are gaining significant interest due to their wide applicability.
• Foam characteristics depend on particle properties (size, charge, hydrophobicity) and system components (surfactants, salts).
• Existing literature can appear contradictory, especially in complex multi-component systems.

Purpose of the Study:

• To provide a comprehensive overview of particle-stabilized foams (Pickering foams).
• To review and clarify the underlying mechanisms of foam stabilization by particles.
• To outline the role of salts and other factors (pH, temperature, gas type) on Pickering foams.

Main Methods:

• Literature review focusing on particle-stabilized foams.
• Analysis of factors influencing foam stability, including particle characteristics and environmental conditions.
• Examination of applications in various industries.

Main Results:

• Detailed review of stabilization mechanisms by particles of varying morphology, chemistry, size, and type.
• Clarification of the influence of salts, pH, temperature, and gas type on Pickering foam stability.
• Highlighting of recent advancements and applications in food, mining, oil & gas, and wastewater treatment.

Conclusions:

• Pickering foams are versatile and their stability is governed by a complex interplay of factors.
• Further research is needed to address identified gaps, particularly concerning multi-component systems.
• This review consolidates knowledge on Pickering foams, guiding future research and industrial applications.