A facile thermal decomposition route to synthesise CoFe2O4 nanostructures

Kalimuthu, Kalpanadevi; Sinduja, C. R.; Manimekalai, R.

doi:10.2478/s13536-013-0153-1

Cited by 12 publications

(6 citation statements)

References 13 publications

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“…CoFe2O4 (CFO) has an inverse spinel structure with general formula AB2O4 (A = Fe and B = Co, Fe) where half of the Fe 3+ occupies the octahedral sites and the other half Fe 3+ occupies the tetrahedral sites whereas all the Co 2+ occupies the octahedral sites (Munjal, Khare, et al 2016). Several techniques such as microemulsion (Mathew and Juang 2007), coprecipitation (Kim, Kim, and Lee 2003) , ball milling (Manova et al 2004) , sol−gel (Lavela and Tirado 2007) , thermal decomposition (Kalpanadevi, Sinduja, and Manimekalai 2014) and sonochemical (Saffari et al 2014) method have been employed for the synthesis of magnetic nanoparticles but all these synthesis methods often produce larger size nanoparticles with wide particle size distribution. But most of the above stated applications requires a narrow particle size distribution, as the performance of the magnetic nanoparticles strongly depends upon the particle size and particle size distribution.…”

Section: -Dec-2016)mentioning

confidence: 99%

Transforming single domain magnetic CoFe2O4 nanoparticles from hydrophobic to hydrophilic by novel mechanochemical ligand exchange

Munjal

Khare

2017

J Nanopart Res

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Single phase, uniform size (~9 nm) Cobalt Ferrite (CFO) nanoparticles have been synthesized by hydrothermal synthesis using oleic acid as a surfactant. The as synthesized oleic acid coated CFO (OA-CFO) nanoparticles were well dispersible in nonpolar solvents but not dispersible in water. The OA-CFO nanoparticles have been successfully transformed to highly water dispersible citric acid coated CFO (CA-CFO) nanoparticles using a novel single step ligand exchange process by mechanochemical milling, in which small chain citric acid molecules replace the original large chain oleic acid molecules available on CFO nanoparticles.The OA-CFO nanoparticle's hexane solution and CA-CFO nanoparticle's water solution remain stable even after six months, and shows no agglomeration and their dispersion stability was confirmed by zeta potential measurements. The contact angle measurement shows that OA-CFO nanoparticles are hydrophobic whereas CA-CFO nanoparticles are superhydrophilic in nature. The potentiality of as synthesized OA-CFO and mechanochemically transformed CA-CFO nanoparticles for the demulsification of highly stabilized water-in-oil and oil-in-water emulsions has been demonstrated.

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Section: -Dec-2016)mentioning

confidence: 99%

Transforming single domain magnetic CoFe2O4 nanoparticles from hydrophobic to hydrophilic by novel mechanochemical ligand exchange

Munjal

Khare

2017

J Nanopart Res

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“…Therefore, it is of interest to study the formation processes of nanocrystalline cobalt-ferrite-based powder allowing the creation of slightly agglomerated crystalline nanoparticles with a narrow size distribution. Methods belonging to the group of "soft chemistry" techniques are often used for these purposes [13][14][15][16][17][18][19][24][25][26][27][28][29][30][31][32][33][34]. A method for combined hydrothermal and microwave treatment of hydroxides [31][32][33][34][35] is one of the promising methods for the synthesis of nanosized powders; when this method is used, the hydrothermal medium is heated due to exposure to the microwave radiation.…”

Section: Introductionmentioning

confidence: 99%

“…Methods belonging to the group of "soft chemistry" techniques are often used for these purposes [13][14][15][16][17][18][19][24][25][26][27][28][29][30][31][32][33][34]. A method for combined hydrothermal and microwave treatment of hydroxides [31][32][33][34][35] is one of the promising methods for the synthesis of nanosized powders; when this method is used, the hydrothermal medium is heated due to exposure to the microwave radiation. The earlier studies [35,36] showed that CoFe 2 O 4 nanocrystals were already formed within the first minute of synthesis at a temperature of 130 • C in the mode of microwave heating of co-precipitated cobalt and iron hydroxides.…”

Section: Introductionmentioning

confidence: 99%

Formation of cobalt ferrite nanopowders in an impinging-jets microreactor

Barashok¹,

Панчук²,

Семенов³

et al. 2021

Nanosystems: Phys. Chem. Math.

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The dependence of cobalt ferrite nanosized powder production process on the synthesis method and conditions was studied. The paper shows the possibility for producing nanocrystalline CoFe 2 O 4 with an average particle size of 12 nm under conditions of an impinging-jets microreactor at room temperature. The influence exerted by the parameters of process implementation in the microreactor on phase formation in the CoO-Fe 2 O 3 -H 2 O system was analyzed.

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“…Several techniques such as microemulsion [13], coprecipitation [14], ball milling [15], sol−gel [16], thermal decomposition [17], sonochemical [18] and electrosynthesis [9] method have been employed for the synthesis of magnetic nanoparticles but all these synthesis methods often produce larger size nanoparticles with wide particle size distribution.…”

Section: Introductionmentioning

confidence: 99%

Water dispersible CoFe2O4 nanoparticles with improved colloidal stability for biomedical applications

Munjal

Khare

Nehate

et al. 2016

Journal of Magnetism and Magnetic Materials

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Single phase cobalt ferrite (CoFe2O4, CFO) nanoparticles of a controlled size (~ 6 nm) exhibiting superparamagnetic properties have been synthesized by hydrothermal technique using oleic acid (OA) as surfactant. The oleic acid coated CFO nanoparticles are stable in nonpolar organic media, such as hexane but are not well dispersible in water. The surface of these snanoparticles has been further modified by citric acid using ligand exchange process, which makes CFO nanoparticles more stable colloidal solution in water. Citric acid coated CFO nanoparticles exhibits high dispersibility in water, high zeta potential, very low coercivity and moderate saturation magnetization. Biocompatibility of these CFO nanoparticles is demonstrated through cytotoxicity test in L929 cell line.

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A facile thermal decomposition route to synthesise CoFe2O4 nanostructures

Cited by 12 publications

References 13 publications

Transforming single domain magnetic CoFe2O4 nanoparticles from hydrophobic to hydrophilic by novel mechanochemical ligand exchange

Transforming single domain magnetic CoFe2O4 nanoparticles from hydrophobic to hydrophilic by novel mechanochemical ligand exchange

Formation of cobalt ferrite nanopowders in an impinging-jets microreactor

Water dispersible CoFe2O4 nanoparticles with improved colloidal stability for biomedical applications

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