Heat dissipation mechanism of magnetite nanoparticles in magnetic fluid hyperthermia

Makoto Suto; Yasutake Hirota; Hiroaki Mamiya; Asaya Fujita; Ryo Kasuya; Kazuyuki Tohji; Balachandran Jeyadevan

doi:10.1016/j.jmmm.2009.02.070

Heat dissipation mechanism of magnetite nanoparticles in magnetic fluid hyperthermia

Makoto Suto, Yasutake Hirota, Hiroaki Mamiya, Asaya Fujita, Ryo Kasuya, Kazuyuki Tohji, Balachandran Jeyadevan

Environmental Studies (department affiliation only)

Research output: Contribution to journal › Article › peer-review

116 Citations (Scopus)

Abstract

The relative contributions of Néel and Brownian relaxations on magnetic heat dissipation were studied by investigating the physical, magnetic and heating characteristics of magnetite nanoparticle suspensions with average diameters of 12.5 and 15.7 nm. Heating characteristics depended on the dispersion states of particles. The specific absorption rates (SAR) dropped by 27% for the 12.5 nm particles to 16.8×10^-9 W g^-1 Oe^-2 Hz^-1 and by 67% for the 15.7 nm particles to 9.69×10^-9 W g^-1 Oe^-2 Hz^-1, when the particle rotation was suppressed by dispersing magnetite nanoparticles in hydro-gel.

Original language	English
Pages (from-to)	1493-1496
Number of pages	4
Journal	Journal of Magnetism and Magnetic Materials
Volume	321
Issue number	10
DOIs	https://doi.org/10.1016/j.jmmm.2009.02.070
Publication status	Published - 2009 May 1

Keywords

Brown relaxation
Heat dissipation
Magnetic fluid
Magnetite
Néel relaxation

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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10.1016/j.jmmm.2009.02.070

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title = "Heat dissipation mechanism of magnetite nanoparticles in magnetic fluid hyperthermia",

abstract = "The relative contributions of N{\'e}el and Brownian relaxations on magnetic heat dissipation were studied by investigating the physical, magnetic and heating characteristics of magnetite nanoparticle suspensions with average diameters of 12.5 and 15.7 nm. Heating characteristics depended on the dispersion states of particles. The specific absorption rates (SAR) dropped by 27% for the 12.5 nm particles to 16.8×10-9 W g-1 Oe-2 Hz-1 and by 67% for the 15.7 nm particles to 9.69×10-9 W g-1 Oe-2 Hz-1, when the particle rotation was suppressed by dispersing magnetite nanoparticles in hydro-gel.",

keywords = "Brown relaxation, Heat dissipation, Magnetic fluid, Magnetite, N{\'e}el relaxation",

author = "Makoto Suto and Yasutake Hirota and Hiroaki Mamiya and Asaya Fujita and Ryo Kasuya and Kazuyuki Tohji and Balachandran Jeyadevan",

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T1 - Heat dissipation mechanism of magnetite nanoparticles in magnetic fluid hyperthermia

AU - Suto, Makoto

AU - Hirota, Yasutake

AU - Mamiya, Hiroaki

AU - Fujita, Asaya

AU - Kasuya, Ryo

AU - Tohji, Kazuyuki

AU - Jeyadevan, Balachandran

PY - 2009/5/1

Y1 - 2009/5/1

N2 - The relative contributions of Néel and Brownian relaxations on magnetic heat dissipation were studied by investigating the physical, magnetic and heating characteristics of magnetite nanoparticle suspensions with average diameters of 12.5 and 15.7 nm. Heating characteristics depended on the dispersion states of particles. The specific absorption rates (SAR) dropped by 27% for the 12.5 nm particles to 16.8×10-9 W g-1 Oe-2 Hz-1 and by 67% for the 15.7 nm particles to 9.69×10-9 W g-1 Oe-2 Hz-1, when the particle rotation was suppressed by dispersing magnetite nanoparticles in hydro-gel.

AB - The relative contributions of Néel and Brownian relaxations on magnetic heat dissipation were studied by investigating the physical, magnetic and heating characteristics of magnetite nanoparticle suspensions with average diameters of 12.5 and 15.7 nm. Heating characteristics depended on the dispersion states of particles. The specific absorption rates (SAR) dropped by 27% for the 12.5 nm particles to 16.8×10-9 W g-1 Oe-2 Hz-1 and by 67% for the 15.7 nm particles to 9.69×10-9 W g-1 Oe-2 Hz-1, when the particle rotation was suppressed by dispersing magnetite nanoparticles in hydro-gel.

KW - Brown relaxation

KW - Heat dissipation

KW - Magnetic fluid

KW - Magnetite

KW - Néel relaxation

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