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Updated: May 25, 2026

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Preparation of responsive micrometer-sized microgel particles with a highly functionalized shell.

Zifu Li1, Man-Hin Kwok, To Ngai

  • 1Department of Chemistry, The Chinese University of Hong Kong, Shatin, N.T, Hong Kong.

Macromolecular Rapid Communications
|February 4, 2012
PubMed
Summary

Researchers developed large, pH-responsive microgel particles with shell-localized carboxylic acid groups. These particles efficiently load and release active ingredients, with calcium ions aiding in uptake regulation and revealing functional group distribution.

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Nanotechnology

Background:

  • Microgel particles are widely used in drug delivery and sensing.
  • Controlling the distribution of functional groups within microgels is crucial for tailored applications.
  • Investigating interactions at the single-particle level provides fundamental insights.

Purpose of the Study:

  • To develop a facile synthesis for large, pH-responsive microgel particles.
  • To investigate the loading and release of active ingredients based on pH changes.
  • To explore the role of calcium ions in regulating active ingredient uptake and functional group distribution.

Main Methods:

  • Synthesis of micrometer-sized (∼3.5 μm) microgel particles with shell-localized carboxylic acid groups.

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  • Utilizing optical microscopy to study individual, isolated microgel particles.
  • Investigating the effect of pH on the loading and release of active ingredients.
  • Employing calcium ion complexation to study functional group distribution.

    • Main Results:

    • Successfully synthesized large, pH-responsive microgel particles.
    • Demonstrated pH-dependent loading and release of active ingredients.
    • Showed that Ca(2+) complexation regulates active ingredient uptake efficiency.
    • Revealed a novel method to visualize the spatial distribution of functional groups within the microgels.

    Conclusions:

    • The synthesized microgel particles offer a platform for studying particle-active ingredient interactions.
    • pH responsiveness and calcium ion complexation provide tunable control over active ingredient delivery.
    • This approach enables the visualization of functional group distribution in microgels.