Synthesis and magnetic properties of Co–Zn magnetic fluid

Vaidyanathan, G.; Sendhilnathan, S.

doi:10.1016/j.jmmm.2007.08.021

Cited by 22 publications

(9 citation statements)

References 10 publications

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“…The substitution of nonmagnetic ions such as Zn, which has a preferential A site occupancy results in the reduction of the exchange interaction between A and B sites. Hence, by varying the degree of zinc substitution, it is possible to manipulate the magnetic properties of the fluid samples [17,20]. According to Neel's two sublattice model of ferrimagnetism, the magnetic moment per formula unit in B , n B N(x) is expressed as:…”

Section: Magnetic Studiesmentioning

confidence: 99%

“…Co-Zn ferrites have aroused increasing interest among researchers of various fields due to their extensive applications such as information storage system, medical diagnostics, magnetic drug delivery, hyperthermia for cancer treatment, ferrofluid technology, hard disc recording media, flexible recording media, magnetic static wave devices, surface acoustic wave transducers, vacuum seals [14][15][16][17][18]. Various preparation techniques have been developed to produce Co 1−x Zn x Fe 2 O 4 nanoparticles, such as co-precipitation method [19,20], ceramic technique [21], solid-state reaction technique [22,23], forced hydrolysis method [16], hydrothermal route [18] and solvothermal method [24].…”

Section: Introductionmentioning

confidence: 99%

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Synthesis and characterization of MWCNTs/Co1−Zn Fe2O4 magnetic nanocomposites and their use in hydrogels

Chen

Wang

Zhang

et al. 2011

Journal of Alloys and Compounds

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Section: Magnetic Studiesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of MWCNTs/Co1−Zn Fe2O4 magnetic nanocomposites and their use in hydrogels

Chen

Wang

Zhang

et al. 2011

Journal of Alloys and Compounds

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“…Then, the obtained precipitate was washed several times with deionized water. Further the product was washed with acetone to remove impurities and dried at room temperature [10,11].…”

Section: Methodsmentioning

confidence: 99%

“…The coating of nanoparticles in the prepared ferrofluids prevented agglomeration of the particles caused by magnetic and van der Waals attraction forces. In addition, it provided strong electrostatic interparticle repulsion between the magnetic nanoparticles [10,11]. Thus, the prepared Co-Mn ferrofluids were chemically stable.…”

Section: Preparation Of Ferrofluidsmentioning

confidence: 96%

Experimental investigation on heat transfer rate of Co–Mn ferrofluids in external magnetic field

Margabandhu

Sendhilnathan

Senthilkumar

et al. 2016

Materials Science-Poland

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Manganese substituted cobalt ferrite (Co 1−x Mn x Fe 2 O 4 with x = 0, 0.3, 0.5, 0.7 and 1) nanopowders were synthesized by chemical coprecipitation method. The synthesized magnetic nanoparticles were investigated by various characterization techniques, such as X-ray diffraction (XRD), vibrating sample magnetometry (VSM), scanning electron microscopy (SEM) and thermogravimetric and differential thermal analysis (TG/DTA). The XRD results confirmed the presence of cubic spinel structure of the prepared powders and the average crystallite size of magnetic particles ranging from 23 to 45 nm. The VSM results showed that the magnetic properties varied with an increase in substituted manganese while SEM analysis showed the change in the morphology of obtained magnetic nanoparticles. The TG/DTA analysis indicated the formation of crystalline structure of the synthesized samples. The heat transfer rate was measured in specially prepared magnetic nanofluids (nanoparticles dispersed in carrier fluid transformer oil) as a function of time and temperature in presence of external magnetic fields. The experimental analysis indicated enhanced heat transfer rate of the magnetic nanofluids which depended upon the strength of external magnetic field and chemical composition.

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“…At last, acetone was added with the obtained precipitate to remove unnecessary constituents and dried normally. Thus, dried cobalt manganese ferrite samples coated with oleic acid was obtained [9,10]. Cobalt manganese ferrite based magnetic fluids were prepared by dispersing 1.25 % volume fraction of cobalt manganese ferrite nanopowders (Co1-xMnxFe2O4) of different molar ratio in base fluids (deionized water and transformer oil).…”

Section: Magnetic Fluid Synthesismentioning

confidence: 99%

Tuning of Heat Transfer Rate of Cobalt Manganese Ferrite Based Magnetic Fluids in Varying Magnetic Field

Marimuthu¹,

Sendhilnathan²,

Thongmee³

2017

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Magnetic fluids are the colloidal solutions containing suspended magnetic nanoparticles in carrier fluids. The present work analyzed the heat transfer characteristics of de-ionized water and transformer oil (base fluids) based cobalt manganese ferrite (Co1-xMnxFe2O4 coated with oleic acid synthesized via co-precipitation technique) magnetic fluids in varying magnetic field. Experimental investigations were carried out to analyze the heat transfer property of synthesized magnetic fluids (MNF) in varying magnetic field applied in perpendicular direction to the thermal gradient of magnetic fluids. The experimental results indicate that the magnetic fluids show enhancement in heat transfer rate than carrier fluids in absence of magnetic field and it shows decrement in heat transfer rate in presence of varying magnetic field. Thus, the results reveal that the heat transfer characteristics of cobalt manganese ferrite based magnetic fluids was tunable by controlling the direction and influence of magnetic field strength. This tunable heat transfer property of cobalt manganese ferrite based magnetic fluids could be applicable in heat transport phenomena of transformers and in microelectronic devices.

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Synthesis and magnetic properties of Co–Zn magnetic fluid

Cited by 22 publications

References 10 publications

Synthesis and characterization of MWCNTs/Co1−Zn Fe2O4 magnetic nanocomposites and their use in hydrogels

Synthesis and characterization of MWCNTs/Co1−Zn Fe2O4 magnetic nanocomposites and their use in hydrogels

Experimental investigation on heat transfer rate of Co–Mn ferrofluids in external magnetic field

Tuning of Heat Transfer Rate of Cobalt Manganese Ferrite Based Magnetic Fluids in Varying Magnetic Field

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