Synthesis and characterization of spinelic ferrites obtained from coordination compounds as precursors

Culiță, Daniela C.; Patron, Luminiţa; Teodorescu, V. S.; Balint, Ioan

doi:10.1016/j.jallcom.2006.05.104

Cited by 18 publications

(7 citation statements)

References 27 publications

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“…It can be noted that the final decomposition temperature of the precursor is lower than that of the tamarind fruit extract. This behavior supports the formation of a complex coordination compound and, also, suggests the catalytic effect of Fe 3+ /Co 2+ cations on the thermal decomposition of the carboxylate anions [11].…”

Section: Characterization Of the Cobalt Ferrite Precursor (Mcp)supporting

confidence: 74%

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Structural, morphological and magnetic investigations on cobalt ferrite nanoparticles obtained through green synthesis routes

et al. 2021

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This paper describes for the first time two processing routes-the precursor method and the two-step wet chemical process-for the synthesis of magnetic cobalt ferrite using the Tamarindus indica fruit extract. These green approaches are eco-friendly, safe and efficient alternatives to classical chemical methods. The aqueous extract from tamarind fruit contains numerous metabolites (organic acids, aminoacids). All these bioactive components are able to chelate metal ions leading to the formation of the multimetallic complex (precursor of cobalt ferrite). The obtained precursor was characterized by Fourier transform infrared spectroscopy (FTIR), thermal analysis, X-ray diffraction analysis (XRD) and magnetic measurements. The structure, morphology and magnetic behavior of the cobalt ferrite samples prepared through both synthesis routes were investigated by various characterization techniques: FTIR, XRD, scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDS), Mössbauer spectroscopy and magnetic measurements. XRD data confirmed that a cubic spinel structure was obtained for both ferrite powders with average crystallite size of 13 and 5 nm, respectively. The microstructure study by SEM revealed the formation of nanocrystallites assemblies using the precursor method and carbon-rich particles forming granulated micron-sized agglomerates, embedding ferrite nanocrystallites obtained through the two-step wet chemical process. Mössbauer spectroscopy results evidenced relaxation processes in the CoFe 2 O 4 samples at room temperature, and the main characteristics of the involved sublattices were derived. The magnetic investigation revealed a typical magnetic behavior for a spinel, with CoFe 2 O 4 nanoparticles ferrimagnetic at low temperature and superparamagnetic at room temperature.

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Section: Characterization Of the Cobalt Ferrite Precursor (Mcp)supporting

confidence: 74%

“…These biomolecules increase the specificity toward cellular targets, prevent the agglomeration of the particles and also decrease the cytotoxicity of these particles [6]. The most commonly used biomolecules are the natural and synthetic polymers [7][8][9], the aminoacids [10], the polyhydroxycarboxylic acids and the bile acids [11].…”

Section: Introductionmentioning

confidence: 99%

Structural, morphological and magnetic investigations on cobalt ferrite nanoparticles obtained through green synthesis routes

et al. 2021

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“…Figure 4b shows the wide-angle XRD powder diffraction patterns of the samples. The reflections at 2theta: 29.98(220), 35.58(311), 43.05(400), 53.48(442), 57.14(511), 62.92(440), and 74.30(533) values, confirm the presence of magnetite with an inverse cubic spinel structure in the investigated samples [28]. The crystallite size of the magnetite was calculated to be ~6 nm.…”

Section: Materials Characterizationmentioning

confidence: 53%

Novel Magnetic Nanocomposites Based on Carboxyl-Functionalized SBA-15 Silica for Effective Dye Adsorption from Aqueous Solutions

et al. 2022

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In this study, three novel magnetic nanocomposites based on carboxyl-functionalized SBA-15 silica and magnetite nanoparticles were prepared through an effective and simple procedure and applied for methylene blue (MB) and malachite green G (MG) adsorption from single and binary solutions. Structure, composition, morphology, magnetic, and textural properties of the composites were thoroughly investigated. The influence of the amount of carboxyl functional groups on the physicochemical and adsorptive properties of the final materials was investigated. The capacity of the synthesized composites to adsorb MB and MG from single and binary solutions and the factors affecting the adsorption process, such as contact time, solution pH, and dye concentration, were assessed. Kinetic modelling showed that the dye adsorption mechanism followed the pseudo-second-order kinetic model, indicating that adsorption was a chemically controlled multilayer process. The adsorption rate was simultaneously controlled by external film diffusion and intraparticle diffusion. It was evidenced that the molecular geometry of the dye molecule plays a major role in the adsorption process, with the planar geometry of the MB molecule favoring adsorption. The analysis of equilibrium data revealed the best description of MB adsorption behavior by the Langmuir isotherm model, whereas the Freundlich model described better the MG adsorption.

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“…Sodium cholate was found to be a promising complexing agent for the fabrication of spinel ferrites of controlled stoichiometry. [ 47 ] The use of sodium cholate facilitated the formation of single‐phase spinel NPs at relatively low temperatures. [ 47 ] Metal cholate self‐assembly offered a unique opportunity for the fabrication of 1D nanohelices.…”

Section: Synthesis and Dispersion Of Inorganic Npsmentioning

confidence: 99%

“…[ 47 ] The use of sodium cholate facilitated the formation of single‐phase spinel NPs at relatively low temperatures. [ 47 ] Metal cholate self‐assembly offered a unique opportunity for the fabrication of 1D nanohelices. [ 48 ] It has been demonstrated that metal cholate supramolecular systems can be used as soft templates for the fabrication of SiO 2 and ZnS helical nanomaterials [ 48 ] for advanced applications in nonlinear optics, catalysis, and sensors.…”

Section: Synthesis and Dispersion Of Inorganic Npsmentioning

confidence: 99%

Multifunctional Properties of Commercial Bile Salts for Advanced Materials Engineering

et al. 2021

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Applications of bile acids (BAs) and bile salts (BSs) in the nanotechnology of functional materials are described. The exceptionally strong solubilization and dispersion power of BAs/BSs is a key factor for the solubilization of dyes, drugs, and polymers for electronic, optical, and biomedical devices, fabrication of composites, based on carbon nanotubes, graphene, diamonds, quantum dots, and polymers for applications in energy storage devices, coatings for corrosion protection of metals, sensors and electronic devices. BAs/BSs have attracted attention for synthesis, design, and surface modification of advanced materials. BAs/BSs are used as reducing, capping, chelating and dispersing agents for the synthesis of nanoparticles of metals and alloys, and low temperature synthesis of stoichiometric nanostructured complex oxides. BAs/BSs exhibit unique selfassembly properties, which are successfully used for the template synthesis of functional nanoparticles of controlled shapes. Particularly important are applications of BAs/BSs in the fabrication of dye sensitized solar cells with enhanced efficiency. Electrochemical strategies are discovered for the deposition of BA films and composites. Of particular interest are the unique gel-forming properties of BAs/BSs, which provide a basis for the synthesis of nanoparticles of controlled size and fabrication of novel materials with advanced functionality.

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Synthesis and characterization of spinelic ferrites obtained from coordination compounds as precursors

Cited by 18 publications

References 27 publications

Structural, morphological and magnetic investigations on cobalt ferrite nanoparticles obtained through green synthesis routes

Structural, morphological and magnetic investigations on cobalt ferrite nanoparticles obtained through green synthesis routes

Novel Magnetic Nanocomposites Based on Carboxyl-Functionalized SBA-15 Silica for Effective Dye Adsorption from Aqueous Solutions

Multifunctional Properties of Commercial Bile Salts for Advanced Materials Engineering

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