Synthesis and stability of switchable CO₂-responsive foaming coupled with nanoparticles

Area of Science:

• Materials Science
• Colloid and Surface Chemistry

Background:

• CO2-responsive foaming offers unique switching characteristics but faces stability challenges.
• Improving foam stability is crucial for practical applications in various industries.

Purpose of the Study:

• To synthesize a novel CO2-switchable foam with enhanced stability.
• To investigate the synergistic effects of nanoparticles and surfactants on foam properties.
• To validate the CO2-N2 switching behavior of the developed foam.

Main Methods:

• Synthesis of CO2-switchable foam by combining hydrophilic nanoparticle N20 with foaming agent C12A.
• Analytical experiments to evaluate foam stability, including half-life measurements.
• Contact angle measurements to determine nanoparticle-surfactant synergy.
• Testing CO2-N2 switching cycles to assess foam degradation.

Main Results:

• The optimal synergy between cationic surfactants and nanoparticles (N20) was achieved with a contact angle of 37.83°.
• Addition of 1.5 wt% N20 increased the foam half-life by 14 times compared to pure C12A foam.
• The C12A-N20 foam demonstrated distinct CO2-N2 switching with minimal degradation over three cycles.

Conclusions:

• The developed CO2-switchable foam exhibits significantly improved stability and reliable switching characteristics.
• The synergistic interaction between N20 nanoparticles and C12A surfactant is key to enhanced foam performance.
• This research paves the way for advanced CO2 foam applications in energy and environmental sectors.