Size Effect of Fe3O4 Nanoparticles on Magnetism and Dispersion Stability of Magnetic Nanofluid

It is well known that magnetic nanofluids are widely applied in various fields ranging from heat transfer to miniature cooling, and from damping to sealing, due to the mobility and magnetism under magnetic field. Herein, the PFPE-oil based magnetic nanofluids with superior magnetization and dispersi...

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Autores principales:	Fang Chen, Nasir Ilyas, Xiaobing Liu, Zhenggui Li, Shengnan Yan, Hao Fu
Formato:	article
Lenguaje:	EN
Publicado:	Frontiers Media S.A. 2021
Materias:	Fe3O4 nanoparticle size magnetic nanofluids magnetism dispersion stability heat transfer General Works A
Acceso en línea:	https://doaj.org/article/1b4dd69976c24531b6d4305033f3d2eb
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id	oai:doaj.org-article:1b4dd69976c24531b6d4305033f3d2eb
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spelling	oai:doaj.org-article:1b4dd69976c24531b6d4305033f3d2eb2021-11-30T15:31:24ZSize Effect of Fe3O4 Nanoparticles on Magnetism and Dispersion Stability of Magnetic Nanofluid2296-598X10.3389/fenrg.2021.780008https://doaj.org/article/1b4dd69976c24531b6d4305033f3d2eb2021-11-01T00:00:00Zhttps://www.frontiersin.org/articles/10.3389/fenrg.2021.780008/fullhttps://doaj.org/toc/2296-598XIt is well known that magnetic nanofluids are widely applied in various fields ranging from heat transfer to miniature cooling, and from damping to sealing, due to the mobility and magnetism under magnetic field. Herein, the PFPE-oil based magnetic nanofluids with superior magnetization and dispersion stability were obtained via regulating reaction temperature. The structures of particles were characterized by X-ray diffraction (XRD) and transmission electron microscopy (TEM). The size effects of particles on the magnetism and coating effect of particles, and on the stability and saturation magnetization of the fluids were characterized by Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), vibrating sample magnetometer (VSM) and density instrument, respectively. The results indicate that the impurity phase FeOOH only appear in the sample prepared at 18°C and the average size of Fe3O4 nanoparticles reduces from 120 to 20 nm with raising reaction temperature. The saturation magnetization of Fe3O4 particles increases firstly and then reduces with increasing particle size, which is affected by the thickness of magnetic dead layer and impurity phase FeOOH. The Fe3O4 particles could be chemically coated by PFPE-acids, and the coated mass is a little affected by particle size. The stability of the nanofluids lowers while the saturation magnetization increases firstly and then decrease with increasing particle size. At reaction temperature of 60°C, Fe3O4 particles of 25 nm and the nanofluids with superior stability and saturation magnetization were obtained. Our results indicate that the control of nanoparticles size by regulating reaction temperature can be a useful strategy for preparing magnetic nanofluids with desirable properties for various potential applications.Fang ChenFang ChenNasir IlyasXiaobing LiuZhenggui LiShengnan YanHao FuFrontiers Media S.A.articleFe3O4 nanoparticle sizemagnetic nanofluidsmagnetismdispersion stabilityheat transferGeneral WorksAENFrontiers in Energy Research, Vol 9 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Fe3O4 nanoparticle size magnetic nanofluids magnetism dispersion stability heat transfer General Works A
spellingShingle	Fe3O4 nanoparticle size magnetic nanofluids magnetism dispersion stability heat transfer General Works A Fang Chen Fang Chen Nasir Ilyas Xiaobing Liu Zhenggui Li Shengnan Yan Hao Fu Size Effect of Fe3O4 Nanoparticles on Magnetism and Dispersion Stability of Magnetic Nanofluid
description	It is well known that magnetic nanofluids are widely applied in various fields ranging from heat transfer to miniature cooling, and from damping to sealing, due to the mobility and magnetism under magnetic field. Herein, the PFPE-oil based magnetic nanofluids with superior magnetization and dispersion stability were obtained via regulating reaction temperature. The structures of particles were characterized by X-ray diffraction (XRD) and transmission electron microscopy (TEM). The size effects of particles on the magnetism and coating effect of particles, and on the stability and saturation magnetization of the fluids were characterized by Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), vibrating sample magnetometer (VSM) and density instrument, respectively. The results indicate that the impurity phase FeOOH only appear in the sample prepared at 18°C and the average size of Fe3O4 nanoparticles reduces from 120 to 20 nm with raising reaction temperature. The saturation magnetization of Fe3O4 particles increases firstly and then reduces with increasing particle size, which is affected by the thickness of magnetic dead layer and impurity phase FeOOH. The Fe3O4 particles could be chemically coated by PFPE-acids, and the coated mass is a little affected by particle size. The stability of the nanofluids lowers while the saturation magnetization increases firstly and then decrease with increasing particle size. At reaction temperature of 60°C, Fe3O4 particles of 25 nm and the nanofluids with superior stability and saturation magnetization were obtained. Our results indicate that the control of nanoparticles size by regulating reaction temperature can be a useful strategy for preparing magnetic nanofluids with desirable properties for various potential applications.
format	article
author	Fang Chen Fang Chen Nasir Ilyas Xiaobing Liu Zhenggui Li Shengnan Yan Hao Fu
author_facet	Fang Chen Fang Chen Nasir Ilyas Xiaobing Liu Zhenggui Li Shengnan Yan Hao Fu
author_sort	Fang Chen
title	Size Effect of Fe3O4 Nanoparticles on Magnetism and Dispersion Stability of Magnetic Nanofluid
title_short	Size Effect of Fe3O4 Nanoparticles on Magnetism and Dispersion Stability of Magnetic Nanofluid
title_full	Size Effect of Fe3O4 Nanoparticles on Magnetism and Dispersion Stability of Magnetic Nanofluid
title_fullStr	Size Effect of Fe3O4 Nanoparticles on Magnetism and Dispersion Stability of Magnetic Nanofluid
title_full_unstemmed	Size Effect of Fe3O4 Nanoparticles on Magnetism and Dispersion Stability of Magnetic Nanofluid
title_sort	size effect of fe3o4 nanoparticles on magnetism and dispersion stability of magnetic nanofluid
publisher	Frontiers Media S.A.
publishDate	2021
url	https://doaj.org/article/1b4dd69976c24531b6d4305033f3d2eb
work_keys_str_mv	AT fangchen sizeeffectoffe3o4nanoparticlesonmagnetismanddispersionstabilityofmagneticnanofluid AT fangchen sizeeffectoffe3o4nanoparticlesonmagnetismanddispersionstabilityofmagneticnanofluid AT nasirilyas sizeeffectoffe3o4nanoparticlesonmagnetismanddispersionstabilityofmagneticnanofluid AT xiaobingliu sizeeffectoffe3o4nanoparticlesonmagnetismanddispersionstabilityofmagneticnanofluid AT zhengguili sizeeffectoffe3o4nanoparticlesonmagnetismanddispersionstabilityofmagneticnanofluid AT shengnanyan sizeeffectoffe3o4nanoparticlesonmagnetismanddispersionstabilityofmagneticnanofluid AT haofu sizeeffectoffe3o4nanoparticlesonmagnetismanddispersionstabilityofmagneticnanofluid
_version_	1718406490437451776

Size Effect of Fe3O4 Nanoparticles on Magnetism and Dispersion Stability of Magnetic Nanofluid

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