Characterization of CrO2-poly-vinyl pyrrolidone magnetic nanofluid

Crystalline CrO2 nanoparticles were synthesized using chemical methods. Nanofluids were synthesized by the dispersion of CrO2 nanoparticles in poly-vinyl pyrrolidone solution by an ultrasonicator. The structural properties of the nanoparticles were studied with the help of X-ray diffraction. The mag...

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Bibliographic Details
Published in:Journal of magnetism and magnetic materials 2012-11, Vol.324 (22), p.3662-3667
Main Authors: Singh, D.K., Pandey, D.K., Yadav, R.R., Singh, Devraj
Format: Article
Language:English
Subjects:
Condensed matter: electronic structure, electrical, magnetic, and optical properties
CrO2 nanoparticle
Crystal structure
Diffraction
Dispersions
Exact sciences and technology
Giant magnetoresistance
GMR
Magnetic properties
Magnetic properties and materials
Magnetotransport phenomena, materials for magnetotransport
Nanocomposites
Nanofluid
Nanofluids
Nanomaterials
Nanoparticles
Nanostructure
Physics
Ultrasonic NDT
VSM
XRD
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Summary:Crystalline CrO2 nanoparticles were synthesized using chemical methods. Nanofluids were synthesized by the dispersion of CrO2 nanoparticles in poly-vinyl pyrrolidone solution by an ultrasonicator. The structural properties of the nanoparticles were studied with the help of X-ray diffraction. The magnetic properties of the powdered CrO2 were measured with a vibrating sample magnetometer. The magneto-resistance and ultrasonic parameters of the nanofluid were characterized. The (a) effect of calcination temperature on crystalinity of CrO2 nanoparticles, (b) influence of sonication time on the nature of the magneto-resistance for the nanofluid, and (c) governing factor/mechanisms responsible to the ultrasonic properties are discussed. ► CrO2 nanoparticles and CrO2-poly vinyl pyrrolidone nanofluid are synthesized. ► Measurements of structural and magnetic parameters of the nanoparticles are done. ► Measurements of magneto-resistance and ultrasonic parameters of the nanofluid are done. ► Discussion is made for crystalinity of nanoparticles and magneto-resistance of the nanofluid. ► Discussion is also made for the factors/mechanisms responsible to the ultrasonic properties.
ISSN:0304-8853
DOI:10.1016/j.jmmm.2012.05.020