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Related Experiment Video

Updated: Aug 30, 2025

Generation of Alginate Microspheres for Biomedical Applications
10:33

Generation of Alginate Microspheres for Biomedical Applications

Published on: August 12, 2012

21.0K

Producing shape-engineered alginate particles using viscoplastic fluids.

Sima Asadi1, Arif Z Nelson2, Patrick S Doyle1,2,3

  • 1Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, USA. pdoyle@mit.edu.

Soft Matter
|August 31, 2022
PubMed
Summary
This summary is machine-generated.

Researchers developed a novel method to create diverse, shape-engineered hydrogel particles using viscoplastic fluids. This technique allows for precise control over particle morphology for various applications.

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Biomedical Engineering

Background:

  • Non-spherical hydrogel particles are crucial for applications in pharmaceuticals, biomedicine, and food industries.
  • Controlling the shape of hydrogel particles is essential for optimizing their functionality.

Purpose of the Study:

  • To develop a new method for synthesizing shape-engineered alginate particles.
  • To explore the influence of fluid properties and process parameters on particle morphology.

Main Methods:

  • Utilizing the yield stress property of viscoplastic fluids (sodium alginate and a yield-stress material).
  • Dripping the viscoplastic solution into an ionic gelation bath for controlled deformation and crosslinking.
  • Tuning yield stress and nozzle tip orientation to achieve various particle shapes.

Main Results:

  • Successfully produced a wide range of particle shapes, including symmetric, near-spherical, and anisotropic forms (e.g., egg-, rice grain-, arc-, ring-, snail shell-, tear-, and tadpole-like).
  • Demonstrated that particle shape is determined by initial droplet shape, fluid relaxation vs. crosslinking timescales, and the properties of the yield-stress material.
  • Scaling analysis explained the forces governing droplet deformation during particle production.

Conclusions:

  • The described method offers precise control over hydrogel particle shape engineering.
  • This technique holds significant potential for developing advanced materials in various scientific and industrial fields.
  • Understanding the interplay between fluid dynamics and material properties is key to shape control.