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CO2-switchable emulsions with controllable size and viscosity.

Jianzhong Jiang1, Huaixin Li1, Yao Gu1

  • 1The Key Laboratory of Synthetic and Biological Colloids, Ministry of Education, School of Chemical and Material Engineering, Jiangnan University 1800 Lihu Road Wuxi Jiangsu P.R. China jzjiang@jiangnan.edu.cn.

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Summary
This summary is machine-generated.

This study introduces CO2-switchable oil-in-dispersion emulsions, offering reversible emulsification and tunable properties. This green method enables smart control and reuse of emulsion components.

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Area of Science:

  • Colloid and Surface Chemistry
  • Materials Science
  • Green Chemistry

Background:

  • CO2-responsive emulsions are valued for biocompatibility and CO2 removal.
  • Existing emulsions are limited to stabilization and demulsification.
  • Novel CO2-switchable systems are needed for advanced applications.

Purpose of the Study:

  • To develop CO2-switchable oil-in-dispersion (OID) emulsions.
  • To achieve tunable emulsion properties using a CO2/N2 trigger.
  • To demonstrate the recyclability of emulsion components.

Main Methods:

  • Co-stabilization of OID emulsions using silica nanoparticles and sodium N-carboxylate (NCOONa).
  • Utilizing CO2 and N2 gas for reversible emulsification and demulsification.
  • Investigating the effect of CO2/N2 on droplet size and viscosity.

Main Results:

  • Achieved CO2-switchable OID emulsions with low NCOONa (0.01 mM) and silica (0.0001 wt%) concentrations.
  • Demonstrated reversible emulsification/demulsification and aqueous phase recycling.
  • Intelligently controlled droplet sizes (40-1020 μm) and viscosities (6-2190 Pa s) via CO2/N2.
  • Attained reversible conversion between OID and Pickering emulsions.

Conclusions:

  • Developed a green and sustainable method for regulating emulsion states.
  • Enabled smart control over emulsion properties and phase behavior.
  • Expanded potential applications for CO2-responsive emulsions.