Investigations on structural and magnetic properties of cobalt ferrite/silica nanocomposites prepared by the coprecipitation method

Rohilla, Sunil; Kumar, Sushil; Aghamkar, P.; Sunder, Shyam; Agarwal, Ashish

doi:10.1016/j.jmmm.2010.11.001

Cited by 56 publications

(26 citation statements)

References 41 publications

(39 reference statements)

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“…Figure 5 shows the XRD patterns of the dried amorphous powder and raw BFS. Broad signals centered at around 23 • were observed, which was in agreement with data reported by Rohilla et al [34]. In addition, XRF analysis was employed to quantify the oxide compounds of the treated powder and raw BFS.…”

Section: Effects Of the Liquid-to-solid Ratio On Leaching Efficiencysupporting

confidence: 89%

Leaching of Metal Ions from Blast Furnace Slag by Using Aqua Regia for CO2 Mineralization

et al. 2016

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Blast furnace slag (BFS) was selected as the source of Ca for CO 2 mineralization purposes to store CO 2 as CaCO 3 . BFS was dissolved using aqua regia (AR) for leaching metal ions for CO 2 mineralization and rejecting metal ions that were not useful to obtain pure CaCO 3 (as confirmed by XRD analysis). The AR concentration, as well as the weight of BFS in an AR solution, was varied. Increasing the AR concentration resulted in increased metal ion leaching efficiencies. An optimum concentration of 20% AR was required for completely leaching Ca and Mg for a chemical reaction with CO 2 and for suppressing the leaching of impurities for the production of high-purity carbonate minerals. Increasing the liquid-to-solid ratio (L/S) resulted in the increased leaching of all metal ions. An optimum L/S of 0.3/0.03 (=10) was required for completely leaching alkaline-earth metal ions for CO 2 mineralization and for retaining other metal ions in the filtered residue. Moreover, the filtrate obtained using 20% AR and an L/S of 0.3/0.03 was utilized as Ca sources for forming carbonate minerals by CO 2 mineralization, affording CaCO 3 . The results obtained herein demonstrated the feasibility of the use of AR, as well as increasing pH, for the storage of CO 2 as high-purity CaCO 3 .

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Section: Effects Of the Liquid-to-solid Ratio On Leaching Efficiencysupporting

confidence: 89%

Leaching of Metal Ions from Blast Furnace Slag by Using Aqua Regia for CO2 Mineralization

et al. 2016

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“…Due to these problems with high reactivity, agglomeration and aggregation of the nanoparticles, and the possibility of the development of new materials with peculiar properties, it has been synthesized nanocomposite materials formed by metal or metallic oxide nanoparticles dispersed in ceramic or vitreous matrices, avoiding the agglomeration and improving the dispersion and the distribution of the nanoparticles inside the system [20][21][22][23][24][25][26][27][28][29][30][31][32][33][34].…”

Section: Cobalt Ferritesmentioning

confidence: 99%

“…The interest in the preparation of magnetic nanocomposites has increased in the last years due to the properties presented by these materials, which depends on the particle size, concentration and distribution of the particles in the matrix. Nanosystems such as Fe/SiO 2 , Ni/SiO 2 , Fe 3 O 4 /SiO 2 , CoFe 2 O 4 /SiO 2 , NiFe 2 O 4 /SiO 2 have been intensively studied in the last years, revealing different behavior from those of bulk magnetic systems and serving as models for the study of small particles [25][26][27][28][29][30][31][32][33][34].…”

Section: Nanocompositesmentioning

confidence: 99%

Study of Multifunctional Nanocomposites Formed by Cobalt Ferrite Dispersed in a Silica Matrix Prepared by Sol-Gel Process

Mohallem¹,

Silva²,

Nascimento³

et al. 2012

Nanocomposites - New Trends and Developments

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that have been used in diverse devices and systems for industrial products. Some traditional applications of these materials are in cores for motors, generators and transformers, microwave devices, magnetic media used in computers, recording devices, and magnetic cards,There are various metallic elements Fe, Ni, etc that have magnetic properties due to their crystalline atomic structure whose spins align spontaneously. Some alloys formed by metallic elements and others including the earth rare elements also have excellent magnetic properties alnico, samarium-cobalt and neodymium-iron-boron magnets . Finally, the ferrites are a known class of magnetic materials formed by metallic oxides.With the advancement of the material sciences and the emergence of the nanoscience and nanothecnology, new kinds of magnetic materials have been developed and studied in the last years, such as the magnetic nanoparticles, ferrofluids and magnetic nanocomposites.With these materials, new applications could be tested in areas such like electronic, catalysis and biomedicine, among others [ ].

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“…Therefore, in order to avoid particle agglomeration and control of particle size, many authors prepared magnetic nanoparticles dispersing in polymer, inorganic, amorphous, and vitreous matrices [15,16]. Magnetic nanocomposites were also prepared and dispersed in silica matrix [17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Designing Magnetic Layered Double Hydroxides and Two-Dimensional Magnetic Nano-Nets of Cobalt Ferrite through a Novel Approach

et al. 2018

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The present study has a dual aim of supporting magnetic nanoparticles over the nanolayers of LDHs and designing two-dimensional magnetic nano-nets of cobalt ferrite. In this trend, nanoparticles of CoFe2O4 were prepared and supported by Co-Fe LDH through urea hydrolysis. The nanolayered structures of Co-Fe LDH were confirmed by X-ray diffraction, energy-dispersive X-ray spectrometry, FT-IR spectra, thermal analyses, and transmission electron microscopy. In addition, they indicated that 13.2% CoFe2O4 were supported over Co-Fe LDH. Transformation of the nanolayered structures of Co-Fe LDH to nano-nets was achieved by the catalytic effect of the supported CoFe2O4 nanoparticles through solvent thermal technique. X-ray diffraction patterns and transmission electron microscopy images confirmed the transformation of the supported Co-Fe LDH to nano-nets of cobalt ferrite. In order to indicate the effect of the LDH for designing the nano-nets, nanoparticles of cobalt ferrite were prepared by the same technique without LDH. The magnetic behavior of the nano-nets and the supported Co-Fe LDH were measured and compared with the nanoparticles through vibrating sample magnetometer technique. The magnetic parameters indicated that the prepared nano-nets have ferromagnetic behavior and high coercivity. However, the prepared nanoparticles revealed a superparamagnetic state and low coercivity. The experimental results concluded that the incorporation of nanoparticles with nanowires into nano-net structures has been found to be an efficient way to improve their magnetic properties and prevent their agglomerations. Finally, layered double hydroxides are an important source for constructing magnetic nanolayered structures and nano-nets.

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Investigations on structural and magnetic properties of cobalt ferrite/silica nanocomposites prepared by the coprecipitation method

Cited by 56 publications

References 41 publications

Leaching of Metal Ions from Blast Furnace Slag by Using Aqua Regia for CO2 Mineralization

Leaching of Metal Ions from Blast Furnace Slag by Using Aqua Regia for CO2 Mineralization

Study of Multifunctional Nanocomposites Formed by Cobalt Ferrite Dispersed in a Silica Matrix Prepared by Sol-Gel Process

Designing Magnetic Layered Double Hydroxides and Two-Dimensional Magnetic Nano-Nets of Cobalt Ferrite through a Novel Approach

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