Ga-based magnetic fluid with Al2O3-coated Ni nanoparticles

A reusable magnetic-quantum dot material with good magnetic property and high fluorescence retention can qualitatively and quantitatively detect four kinds of antibiotics.

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Surface modification and its role in the preparation of FeSi gradient alloys with good magnetic property and ductility

Journal of Magnetism and Magnetic Materials ◽

10.1016/j.jmmm.2017.11.073 ◽

2018 ◽

Vol 451 ◽

pp. 373-378

Author(s):

Haiyuan Yu ◽

Xiaofang Bi

Keyword(s):

Surface Modification ◽

Magnetic Property ◽

Good Magnetic Property

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Facile Synthesis of Conducting Polypyrrole/Non-Aggregated Magnetite Nanocomposites and their Magnetorheological Characteristics

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.47-50.201 ◽

2008 ◽

Vol 47-50 ◽

pp. 201-204 ◽

Cited By ~ 2

Author(s):

Fei Fei Fang ◽

Jae Lim You ◽

Hyoung Jin Choi

Keyword(s):

Magnetic Property ◽

Weight Ratio ◽

Dispersed Phase ◽

Facile Synthesis ◽

Xrd Pattern ◽

Mr Fluids ◽

Good Magnetic Property ◽

Aggregation Problem ◽

Conducting Polypyrrole ◽

Pure Fe3o4

Large density of the dispersed phase in magnetorheological (MR) fluids has hindered operating MR test and their industrial application. This present work adopted Fe3O4 nanoparticles to prepare MR fluid because of their moderate density and good magnetic property. Furthermore, in order to resolve aggregation problem of Fe3O4 particles due to their nano-scaled size, conducting polypyrrole (PPY) was synthesized around naono-sized Fe3O4 particles via conventional oxidation polymerization. Weight ratio of PPY to Fe3O4 was adjusted to be 5% to avoid possible deterioration of the magnetic property of Fe3O4 particles. TEM images described the morphology for PPY-Fe3O4, and XRD pattern provided information on structural characterization and particle size. Finally, MR performances of pure Fe3O4 and PPY-Fe3O4 nanocomposites were investigated via rotational and oscillatory tests.

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Influence of Pre-Sintering Temperature and Time on the Properties of YIG Target

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.476-478.1150 ◽

2012 ◽

Vol 476-478 ◽

pp. 1150-1153 ◽

Cited By ~ 3

Author(s):

Hui Zheng ◽

Jiang Xia Deng ◽

Liang Zheng ◽

Hui Bin Qin ◽

Jun Wu ◽

...

Keyword(s):

Grain Size ◽

Magnetic Property ◽

Size Distribution ◽

Crystallization Temperature ◽

Sintering Temperature ◽

Precipitation Method ◽

Fine Grained ◽

Good Magnetic Property ◽

Measurement Results ◽

Co Precipitation

The influence of pre-sintering temperature and time, which ranged from 700 to 900°C and from 0.5 to 12h respectively, on the size and shape of the grains composed of YIG target were studied. The YIG precursors, of which the crystallization temperature was obtained by the DSC tests, were synthesized through the chemical co-precipitation method. According to the XRD, SEM and VSM measurement results, YIG powders pre-sintered at 750°C for 7hours, which temperature is lower than the crystallization temperature, can make the target with the highest density, good magnetic property, fine-grained and narrow grain size distribution.

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A magnetic super lattice

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100126597 ◽

1987 ◽

Vol 45 ◽

pp. 360-361 ◽

Cited By ~ 1

Author(s):

M.D. Bentzon ◽

J. v. Wonterghem ◽

A. Thölén

Keyword(s):

Thermal Decomposition ◽

Oleic Acid ◽

Magnetic Fluid ◽

Magnetic Particles ◽

Carbon Film ◽

Thick Layer ◽

Amorphous Iron ◽

Super Lattice ◽

Carrier Liquid ◽

Median Diameter

We report on the oxidation of a magnetic fluid. The oxidation results in magnetic super lattice crystals. The “atoms” are hematite (α-Fe2O3) particles with a diameter ø = 6.9 nm and they are covered with a 1-2 nm thick layer of surfactant molecules.Magnetic fluids are homogeneous suspensions of small magnetic particles in a carrier liquid. To prevent agglomeration, the particles are coated with surfactant molecules. The magnetic fluid studied in this work was produced by thermal decomposition of Fe(CO)5 in Declin (carrier liquid) in the presence of oleic acid (surfactant). The magnetic particles consist of an amorphous iron-carbon alloy. For TEM investigation a droplet of the fluid was added to benzine and a carbon film on a copper net was immersed. When exposed to air the sample starts burning. The oxidation and electron irradiation transform the magnetic particles into hematite (α-Fe2O3) particles with a median diameter ø = 6.9 nm.

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