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Preparation of ethyl cellulose particles with different morphologies through microfluidics
Yue Cui1, Haozhe Zhang1, Jingtao Wang1,2
1School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, P. R. China. wjingtao928@tju.edu.cn.
Soft Matter
|January 27, 2022
Summary
Researchers fabricated diverse ethyl cellulose particle shapes using microfluidics. Flow dynamics and solvent extraction control particle morphology, enabling tailored material properties for various applications.
Area of Science:
- Polymer science and engineering
- Microfluidics and particle fabrication
- Materials science
Background:
- Particle size and shape are critical determinants of polymer material performance and application scope.
- Controlling particle morphology is essential for developing advanced functional materials.
- Microfluidic devices offer precise control over droplet formation and particle synthesis.
Purpose of the Study:
- To generate ethyl cellulose particles with distinct morphologies using a microfluidic device.
- To elucidate the underlying physical mechanisms governing the formation of different particle shapes.
- To establish the relationship between microfluidic parameters and resulting particle morphology.
Main Methods:
- Utilized a microfluidic device with double T-junctions for controlled droplet generation.
- Employed solvent extraction (ethyl acetate in water) for ethyl cellulose solidification.
- Varied continuous and dispersed phase flow rates, and ethyl cellulose concentration to influence morphology.
Main Results:
- Successfully fabricated monodisperse ethyl cellulose particles with morphologies including spherical, dimpled, doughnut-like, and red-blood-cell-like.
- Identified specific flow rate and concentration regimes corresponding to each particle morphology.
- Revealed that droplet circulation flows and stagnation points are key to forming surface features like dimples and holes.
Conclusions:
- Microfluidic solvent extraction provides a versatile platform for fabricating polymer particles with controlled morphologies.
- Understanding droplet hydrodynamics and diffusion-solidification dynamics is crucial for predicting and controlling particle shape.
- The findings offer valuable insights for flow chemistry and the design of novel particle-based materials.
