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Updated: Jun 1, 2026

Alternating Magnetic Field-Responsive Hybrid Gelatin Microgels for Controlled Drug Release
Published on: February 13, 2016
Variable on-demand release function of magnetoresponsive hybrid capsules
Kiyofumi Katagiri1, Yuji Imai, Kunihito Koumoto
1Department of Applied Chemistry, Graduate School of Engineering, Nagoya University, Chikusa-ku, Nagoya, Japan. katagiri@apchem.nagoya-u.ac.jp
Researchers created magnetoresponsive hybrid capsules using polyelectrolytes and magnetic nanoparticles. These capsules release encapsulated dyes on-demand when exposed to magnetic fields, with controllable release rates.
Area of Science:
- Materials Science
- Nanotechnology
- Colloid Science
Background:
- Hybrid capsules offer versatile platforms for controlled release applications.
- Magnetic nanoparticles enable remote triggering of capsule functions.
- Polyelectrolyte multilayers provide tunable shell properties.
Purpose of the Study:
- To fabricate magnetoresponsive hybrid capsules with controllable dye release.
- To investigate the influence of magnetic nanoparticle deposition on release kinetics.
- To demonstrate on-demand release triggered by alternating magnetic fields.
Main Methods:
- Colloid-templating technique utilizing melamine-formaldehyde (MF) core particles.
- Layer-by-layer assembly for polyelectrolyte multilayer shell formation.
- Deposition of iron(III) oxide (Fe(3)O(4)) nanoparticles and subsequent core removal.
- Coating with an amphiphile bilayer for controlled release functionality.
Main Results:
- Successfully fabricated hollow hybrid capsules incorporating Fe(3)O(4) nanoparticles.
- Demonstrated on-demand dye release triggered by alternating magnetic fields via nanoparticle heating and membrane phase transition.
- Showcased controllable release rates by varying Fe(3)O(4) nanoparticle deposition.
Conclusions:
- Magnetoresponsive hybrid capsules are effectively fabricated using a colloid-templating approach.
- The magnetic and release properties are tunable by controlling Fe(3)O(4) nanoparticle content.
- These capsules represent a promising system for on-demand delivery applications.
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