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Complex emulsions for shape control based on mass transfer and phase separation.

Feng Zhang1, Leilei Jiang, Changfeng Zeng

  • 1State Key Laboratory of Materials-Oriented Chemical Engineering and College of Chemical Engineering, Nanjing Tech University, No. 30, Puzhu Road(s), Nanjing 211816, P. R. China. lixiongzhang@yahoo.com lixzhang@njtech.edu.cn.

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Summary
This summary is machine-generated.

This study explores complex emulsions to create novel Janus droplets with core/shell structures. Researchers manipulated oil-to-aqueous ratios and component concentrations to control droplet morphology for advanced material design.

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Area of Science:

  • Materials Science
  • Colloid and Surface Chemistry

Background:

  • Complex emulsions are crucial for fabricating advanced materials.
  • Controlling droplet morphology is key to designing functional particles.

Purpose of the Study:

  • To investigate the formation of multiple Janus droplets with tunable core/shell configurations.
  • To understand the influence of various parameters on emulsion morphology.

Main Methods:

  • Fabrication of complex emulsions using dextran (DEX) aqueous phase and an oil phase containing ethoxylated trimethylolpropane triacrylate (ETPTA) and poly(ethylene glycol) diacrylate (PEGDA).
  • Investigation of parameters including oil-to-aqueous ratio, PEGDA and DEX content, and surfactant type (polyglycerol polyricinoleate (PGPR) and Span 80).
  • Analysis of mass transfer and phase separation phenomena driving morphology evolution.

Main Results:

  • Achieved evolution from non-engulfing to complete engulfing core/shell Janus droplets.
  • Demonstrated control over Janus droplet morphology (single phase, doublet, core/double shell) by adjusting oil/aqueous ratio, PEGDA, and DEX content.
  • Showcased the impact of specific surfactants (PGPR, Span 80) on final droplet structures.

Conclusions:

  • Complex emulsions offer a versatile platform for creating diverse Janus droplet morphologies.
  • Mass transfer and phase separation are critical mechanisms for controlling emulsion structure.
  • The developed method enables the fabrication of solid particles with complex shapes and has broad applicability in material design.