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Gels
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Magnetic Gels
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Magnetic Gels

A special issue of Gels (ISSN 2310-2861).

Deadline for manuscript submissions: closed (20 February 2020) | Viewed by 8445

Special Issue Editor

Dr. Tetsu Mitsumata

E-Mail Website
Guest Editor
Department of Materials Science & Technology, Faculty of Engineering, Niigata University, Niigata 950-2181, Japan
Interests: stimuli-responsive soft materials; composite gel; magnetic responsive soft materials; biopolymers; polysaccharide
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

This Special Issue on “Magnetic Gels” is dedicated to recent developments, from theoretical and fundamental aspects, of the synthesis, characterization, materials property, and applications of magnetic gels; hydrogels and organogels. The physical properties of magnetic gels dramatically change in response to magnetic fields and they have attracted considerable attention in the past few decades. Recently, magnetic gels have been used in industrial products, using their excellent response to magnetic fields; magnetic separation, drug delivery, drug release, magnetic hyperthermia, dampers, sensors, and actuators. Contributions based on the materials science and technology are very welcome.

Research Prof. Tetsu Mitsumata
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Gels is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • Magnetic-responsive property
  • Magnetorheology
  • Magnetostriction
  • Sensors and actuators
  • Vibration control
  • Drug delivery
  • Drug release
  • Magnetic separation
  • Magnetic hyperthermia

Published Papers (2 papers)

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Research

9 pages, 2110 KiB  
Communication
Particle Size in Secondary Particle and Magnetic Response for Carrageenan Magnetic Hydrogels
by Junko Ikeda, Daichi Takahashi, Mayuko Watanabe, Mika Kawai and Tetsu Mitsumata
Gels 2019, 5(3), 39; https://doi.org/10.3390/gels5030039 - 10 Aug 2019
Cited by 9 | Viewed by 3926
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 [...] Read more.
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. Full article
(This article belongs to the Special Issue Magnetic Gels)
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8 pages, 2500 KiB  
Communication
Effect of Sonication Time on Magnetorheological Effect for Monomodal Magnetic Elastomers
by Mayuko Watanabe, Junko Ikeda, Yoshihiro Takeda, Mika Kawai and Tetsu Mitsumata
Gels 2018, 4(2), 49; https://doi.org/10.3390/gels4020049 - 23 May 2018
Cited by 12 | Viewed by 3968
Abstract
The effect of sonication time on the storage modulus and particle morphology for magnetic elastomers was investigated by dynamic viscoelastic measurements and morphological studies. An ultrasonic wave using a homogenizer was irradiated to magnetic liquids containing 70 wt % carbonyl iron, for up [...] Read more.
The effect of sonication time on the storage modulus and particle morphology for magnetic elastomers was investigated by dynamic viscoelastic measurements and morphological studies. An ultrasonic wave using a homogenizer was irradiated to magnetic liquids containing 70 wt % carbonyl iron, for up to 30 min before cure. SEM photographs revealed that magnetic particles were randomly dispersed in the polyurethane matrix for magnetic elastomers with sonication. A parameter showing nonlinear viscoelasticity for magnetic elastomers with sonication decreased from 0.75 to 0.4, indicating that the aggregations of magnetic particles had been destroyed by the sonication. The storage modulus at 500 mT at the linear viscoelastic regime significantly increased with the irradiation time, reaching saturation after 10 min; this suggests an increase in the number of chains of magnetic particles by sonication, due to the random dispersion of magnetic particles. At high strains, the storage modulus at 500 mT increased by 8.9 kPa by sonication, indicating the number of chains of magnetic particles which were not destroyed by increased sonication. It was also found that the storage modulus for polyurethane elastomers without magnetic particles was not varied by sonication, suggesting that the polyurethane network was not broken. The effect of sonication time on the viscoelastic properties, and on the magnetorheological response for magnetic elastomers, is discussed. Full article
(This article belongs to the Special Issue Magnetic Gels)
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