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CO2-Responsive Surfactant-Free Microemulsion.

Dongfang Liu1, Zhiyu Huang1, Yuxin Suo1

  • 1College of Chemistry and Chemical Engineering , Southwest Petroleum University , Chengdu 610500 , P. R. China.

Langmuir : the ACS Journal of Surfaces and Colloids
|July 10, 2018
PubMed
Summary
This summary is machine-generated.

This study developed a surfactant-free microemulsion responsive to carbon dioxide (CO2). Both water-in-oil and oil-in-water formulations demonstrated excellent CO2 stimuli-responsive performance, transitioning into aqueous solutions.

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Area of Science:

  • Colloid and Surface Chemistry
  • Materials Science
  • Chemical Engineering

Background:

  • Surfactant-free microemulsions (SFMEs) offer environmentally friendly alternatives to traditional surfactant-based systems.
  • Stimuli-responsive materials are crucial for advanced applications, including controlled release and separation technologies.
  • Carbon dioxide (CO2) is an abundant and easily handled stimulus for chemical systems.

Purpose of the Study:

  • To prepare and characterize a novel surfactant-free microemulsion (SFME) exhibiting CO2 stimuli-responsive properties.
  • To investigate the phase behavior and microstructural transitions of the SFME system under CO2 influence.
  • To evaluate the performance of both water-in-oil (SFME-I) and oil-in-water (SFME-II) SFME structures in response to CO2.

Main Methods:

  • Preparation of SFME using N, N-dimethylcyclohexylamine (DMCHA) as the oil phase, deionized water as the aqueous phase, and N, N-dimethylethanolamine as an amphisolvent.
  • Ternary-phase diagram analysis to determine single-phase and multiphase zones.
  • Electrical conductivity measurements and UV-visible spectroscopy (using methyl orange as a probe) to elucidate SFME microstructure.
  • Controlled introduction of CO2 to observe phase behavior and structural changes.

Main Results:

  • The ternary-phase diagram successfully mapped the phase behavior of the SFME system.
  • Electrical conductivity and spectroscopic data confirmed the formation of distinct water-in-oil (SFME-I) and oil-in-water (SFME-II) microstructures.
  • SFME-I exhibited significant phase separation upon CO2 addition, with DMCHA protonation leading to dissolution and volume reduction.
  • SFME-II, while not directly phase-separating, transformed into an aqueous solution of ammonium bicarbonate upon continuous CO2 introduction.
  • Both SFME-I and SFME-II demonstrated excellent CO2 stimuli-responsive performance.

Conclusions:

  • A novel CO2-responsive surfactant-free microemulsion system was successfully developed.
  • The system allows for tunable microstructures (water-in-oil or oil-in-water) controllable by DMCHA content.
  • Both microemulsion structures exhibit robust responsiveness to CO2, leading to predictable phase transitions and eventual formation of ammonium bicarbonate solutions.
  • This research opens avenues for CO2-utilization applications in responsive materials and separation processes.