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CO2-responsive surfactants with tunable switching pH.

Yi Lu1, Dejun Sun2, John Ralston3

  • 1Department of Chemical and Materials Engineering, University of Alberta, Edmonton, Alberta T6G 1H9, Canada.

Journal of Colloid and Interface Science
|September 16, 2019
PubMed
Summary
This summary is machine-generated.

This study developed tunable CO2-responsive surfactants using monoethanolamine and fatty acids. Their switching pH, crucial for applications like demulsification, is best determined by interfacial response.

Keywords:
CO(2)-responsive surfactantsDemulsificationInterfacial responseSolution responseTunable switching pHWettability alternation

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Area of Science:

  • Surfactant Chemistry
  • Materials Science
  • Chemical Engineering

Background:

  • CO2-responsive surfactants offer tunable properties but face challenges in switchability and robustness.
  • Developing surfactants with controllable switching pH is essential for targeted applications.
  • Combining monoethanolamine (MEA) with long-chain fatty acids (LCFAs) presents a novel approach to CO2-responsive surfactant design.

Purpose of the Study:

  • To synthesize and characterize a series of CO2-responsive surfactants with tunable switching pH.
  • To investigate the influence of LCFA chain length on surfactant properties.
  • To differentiate and validate interfacial versus bulk solution responses for CO2-responsive surfactants.

Main Methods:

  • Dynamic interfacial tension (IFT) measurements were employed to probe CO2-responsive characteristics at the oil/water interface.
  • In situ probing techniques were used to assess interfacial and solution responses separately.
  • The efficacy of these surfactants was demonstrated through applications in demulsification and ultra-heavy crude oil-water interface modification.

Main Results:

  • The switching pH of the synthesized CO2-responsive surfactants was successfully tuned by varying the hydrocarbon chain length of LCFAs.
  • A significant difference was observed between the switching behavior at the oil/water interface and in the bulk solution.
  • Enhanced molecular interactions at the interface were identified as the cause for the distinct interfacial switching behavior.

Conclusions:

  • The hydrocarbon chain length of LCFAs provides a reliable method for controlling the switching pH of MEA-LCFA surfactants.
  • Interfacial response is a more relevant metric than bulk solution response for determining the switching pH in practical applications.
  • These CO2-responsive surfactants demonstrate potential for effective use in emulsion breaking and modifying interfacial properties in oil-water systems.