Particle Size in Secondary Particle and Magnetic Response for Carrageenan Magnetic Hydrogels.

Junko Ikeda,Mika Kawai,Mayuko Watanabe,Tetsu Mitsumata,Daichi Takahashi

doi:10.3390/gels5030039

Junko Ikeda, Mika Kawai + Show 3 more

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https://doi.org/10.3390/gels5030039

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Journal: Gels	Publication Date: Aug 10, 2019
Citations: 9	License type: CC BY 4.0

Affiliation: Niigata University, Japan Science and Technology Agency

Abstract

The relation between the number of magnetic particles and the change in storage modulus induced by a magnetic field was investigated for weak hydrogels containing carbonyl iron, iron oxide, and barium ferrite particles with different diameters in primary particles while maintaining the magnetization of magnetic particles. The change in storage modulus exhibited a power dependency against the number of magnetic particles, which was nearly independent of the magnetic particles. The change in storage modulus was successfully scaled by the reduced number of magnetic particles using the diameter of secondary particles. Microphotographs revealed that iron oxide and barium ferrite particles form aggregations while carbonyl iron particles are well dispersed in carrageenan gels. The diameter of secondary particles determined by a relation between the change in storage modulus and the reduced number of magnetic particles showed similar values with those observed in microphotographs.

Highlights

Magnetic hydrogels made of polysaccharides have been widely investigated far, and many functions and applications have been reported, such as recoverable adsorbent or drug delivery.This demonstrates a unique property or stimuli-responsive behavior that is not observed in magnetic hydrogels made of synthetic polymer
We investigated the effect of magnetic particles on the change in storage modulus for carrageenan magnetic hydrogels and discovered the key parameter that decides the change in storage modulus for these magnetic gels
carbonyl iron (CI) particles exhibited a single peak at 6.1 μm, while iron oxide (IO) and barium ferrite (BF) particles showed a shoulder besides the main peak

Summary

Introduction

Magnetic hydrogels made of polysaccharides have been widely investigated far, and many functions and applications have been reported, such as recoverable adsorbent or drug delivery. This demonstrates a unique property or stimuli-responsive behavior that is not observed in magnetic hydrogels made of synthetic polymer. Most of these unique properties originate from the relatively strong interaction between magnetic particles and polysaccharides. Samoilova et al developed an excellent and facile method to prepare magnetic composites in which magnetite particles are densely covered with polysaccharides [1,2], showing effective adsorbents for specific lectins and enzyme.

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