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Related Experiment Video

Updated: Feb 4, 2026

Controlled Synthesis and Fluorescence Tracking of Highly Uniform PolyN-isopropylacrylamide Microgels

Controlled Synthesis and Fluorescence Tracking of Highly Uniform PolyN-isopropylacrylamide Microgels

Published on: September 8, 2016

Bisphenol A-responsive microgel comprising hydrophilic poly(acrylamide) network.

Akifumi Kawamura^1,2, Fumiya Tanaka¹, Yuriko Nishimura¹

¹Department of Chemistry and Materials Engineering, Kansai University, Suita, Osaka, Japan.

Science and Technology of Advanced Materials

|February 2, 2026

Summary

Researchers developed molecule-responsive microgels using inverse miniemulsion polymerization. These cyclodextrin-conjugated polyacrylamide microgels rapidly shrink in response to bisphenol A, showing promise for smart sensors and drug delivery.

Keywords:

Molecule-responsive microgel RAFT polymerization cyclodextrin inclusion complex inverse miniemulsion polymerization water-soluble emulsifier zwitterionic polymer

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Last Updated: Feb 4, 2026

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Synthesis of PolyN-isopropylacrylamide Janus Microhydrogels for Anisotropic Thermo-responsiveness and Organophilic/Hydrophilic Loading Capability

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Magnetic and Thermal-sensitive PolyN-isopropylacrylamide-based Microgels for Magnetically Triggered Controlled Release

Magnetic and Thermal-sensitive PolyN-isopropylacrylamide-based Microgels for Magnetically Triggered Controlled Release

Published on: July 4, 2017

Area of Science:

Materials Science
Polymer Chemistry
Nanotechnology

Background:

Stimuli-responsive microgels are crucial for smart sensors and drug delivery.
Developing microgels with specific molecular recognition is an active research area.

Purpose of the Study:

To prepare molecule-responsive microgels with molecular recognition sites.
To utilize inverse miniemulsion polymerization with a water-soluble emulsifier for microgel synthesis.
To demonstrate the rapid response of these microgels to specific molecules.

Main Methods:

Synthesis of a block copolymer emulsifier (PSB-POEG) via reversible addition fragmentation chain transfer (RAFT) polymerization.
Inverse miniemulsion polymerization of acrylamide, acryloyl-modified β-cyclodextrin (CD), and N,N'-methylenebisacrylamide.
Characterization of CD-conjugated PAAm microgels (approx. 150 nm diameter).

Main Results:

Successfully synthesized stable, hydrophilic CD-conjugated PAAm microgels.
Demonstrated rapid microgel shrinkage upon exposure to bisphenol A (BPA) due to CD-BPA-CD complex formation.
Established a method for creating molecularly imprinted and bioconjugated microgels.

Conclusions:

The developed inverse miniemulsion polymerization method is effective for producing responsive hydrophilic microgels.
These microgels offer a versatile platform for designing soft nanomaterials for sensing, separation, and drug delivery.
The rapid molecular response of CD-PAAm microgels highlights their potential in advanced applications.