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CO2-responsive aqueous foams stabilized by pseudogemini surfactants
Zengzi Wang1, Gaihuan Ren1, Jiawen Yang1
1Key Laboratory of Colloid and Interface Chemistry, Shandong University, Ministry of Education, Jinan, Shandong 250100, PR China.
Journal of Colloid and Interface Science
|November 1, 2018
Summary
New "pseudogemini" surfactants (D-LCFA) create CO2-responsive aqueous foams. These foams rupture when exposed to CO2 and regenerate when CO2 is removed, showing potential for industrial applications.
Area of Science:
- Materials Science
- Colloid and Surface Chemistry
Background:
- Developing surfactants with responsive behavior is crucial for advanced material applications.
- Traditional surfactants often lack tunable properties for dynamic environmental changes.
Purpose of the Study:
- To synthesize novel "pseudogemini" surfactants (D-LCFA) with superior surface activity and CO2-responsive foaming capabilities.
- To investigate the structure-property relationships governing the CO2-responsive behavior of these surfactants.
Main Methods:
- Synthesis of D-LCFA surfactants via a simple, eco-friendly Brønsted acid-base reaction between long chain fatty acids (LCFA) and polyetheramine D 230.
- Characterization using 1H NMR and FT-IR to confirm electrostatic interactions between building blocks.
- Evaluation of foam generation and properties using rheograms, FF-TEM, and Cryo-TEM.
Main Results:
- D-LCFA effectively reduces surface tension, facilitating foam generation.
- Aqueous foams generated by D-LCFA rupture within 30 seconds upon CO2 bubbling.
- Foams can be re-generated by removing CO2 via N2 bubbling at 65°C for 10 minutes, demonstrating reversible CO2-responsiveness.
Conclusions:
- The CO2-responsive foaming is attributed to the reversible dissociation and re-association of D-LCFA building blocks.
- These pseudogemini surfactants offer a promising platform for creating tunable aqueous foams.
- Potential applications include foam fracturing, enhanced oil recovery, and radioactive material recovery.
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