Structural and magnetic properties of sol-gel derived CaFe2O4 nanoparticles

Das, Arnab; Govindaraj, R.; Srinivasan, A.

doi:10.1016/j.jmmm.2017.11.102

Cited by 39 publications

(12 citation statements)

References 19 publications

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“…The curves of magnetization versus applied magnetic field showed that the CaFe 2 O 4 nanofibers can be considered as soft ferromagnetic materials with practically negligible remanence and coercivity. The results also indicated that CaFe 2 O 4 nanofibers exhibited superparamagnetic behavior [36], which is attributed to the effects of small grains in the nanofibers [37] and also to the non-magnetic character of the calcium ion. The magnetic contribution is dependent only on the distribution of the iron ions in the CaFe 2 O 4 structure [38].…”

Section: Resultsmentioning

confidence: 87%

CaFe2O4 ferrite nanofibers via solution blow spinning (SBS)

et al. 2020

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CaFe2O4 nanofibers were successfully synthesized via solution blow spinning (SBS), and the influences of heat-treatment on morphological, microstructural, magnetic, and optical properties of the nanofibers were evaluated. In the synthesis process, stoichiometric amounts of iron and calcium nitrates were dissolved in an aqueous solution containing polyvinylpyrrolidone (PVP) and, after that, hybrid nanofibers (PVP/precursors) were produced by SBS. The hybrid nanofibers were calcined and then subjected to microstructural, morphological, and magnetic characterizations. The results evidenced that the fibers presented the crystalline nature of the single-phase CaFe2O4, with a crystallite size of 32.7 and 34.4 nm for the samples calcined at 800 and 1000 °C, respectively. The CaFe2O4 fibers calcined at 600 and 800 °C presented a homogeneous morphology, without beads, and mean diameters of 521 and 427 nm, respectively. The results also revealed nanofibers with low band gaps of approximately 1.98 eV and characteristics of soft magnetic materials.

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Section: Resultsmentioning

confidence: 87%

CaFe2O4 ferrite nanofibers via solution blow spinning (SBS)

et al. 2020

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“…The TG curve (Figure ) shows a 12.8% loss of weight up to 200°C due to evaporation of peripheral water and volatile impurities and loss of oxygen functional groups in graphene oxide . A weight loss of 15.8% in the temperature range from 200°C to 700°C was attributed to complete crystallization of cubic spinel phase of calcium ferrite, oxidative decomposition of carbon atoms of GO, loss of lattice water and crystallization of orthorhombic phase of calcium ferrite . Further a sharp weight loss of 21.4% in the temperature range between 700°C to 900°C was ascribed to decomposition of partially reduced graphene oxide by pyrolysis and rearrangement of carbon framework .…”

Section: Resultsmentioning

confidence: 99%

Greener route for microwave enhanced syntheses of bioactive 1,5‐benzodiazepines using heterogeneous calcium ferrite/graphene oxide nanocomposite as a novel and sustainable catalyst

Gupta

Ameta

Punjabi

2020

Journal of Heterocyclic Chem

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In the present paper, a novel and benign protocol for microwave enhanced one pot syntheses of 2,3‐dihydro‐1,5 benzodiazepine derivatives from substituted acetophenones, aryl‐aldehydes and o‐phenylene diamine using heterogeneous calcium ferrite/graphene oxide (CF/GO) nanocomposite has been reported. The catalyst was prepared by ultrasonication method and characterized by spectral and analytical techniques. The CF/GO nanocomposite was employed for environmentally benign synthesis of 2,3‐dihydro‐1,5 benzodiazepines. The synthesized benzodiazepine derivatives were screened for their antimicrobial activities against various bacteria and fungi. The present synthetic strategy offered several advantages such as excellent yields in short span of time, simple modus operandi, ease of isolation and purification of products, simple recovery and reusability of the catalyst. A tentative mechanism for synthesis of 2,3‐dihydro‐1,5 benzodiazepine using CF/GO nanocatalyst has also been proposed.

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“…Since about 43% of total solar radiation falls in the visible spectral region, the use of efficient photocatalysts absorbing visible light becomes a priority [12,13], also allowing for a decrease in energy consumption and associated costs [14,15]. Zinc/calcium mixed ferrites have appeared as interesting semiconductors for photocatalysis [16]: the incorporation of calcium improved both biocompatibility and magnetic properties compared to neat zinc ferrite [17,18] and pointed to a possible recovery and reuse of the magnetic nanoparticles. These nanoparticles present an estimated bandgap of 1.78 eV allowing for the use of visible light in effluent photoremediation [16].…”

Section: Introductionmentioning

confidence: 99%

“…Zinc/calcium mixed ferrites have appeared as interesting semiconductors for photocatalysis [ 16 ]: the incorporation of calcium improved both biocompatibility and magnetic properties compared to neat zinc ferrite [ 17 , 18 ] and pointed to a possible recovery and reuse of the magnetic nanoparticles. These nanoparticles present an estimated bandgap of 1.78 eV allowing for the use of visible light in effluent photoremediation [ 16 ].…”

Section: Introductionmentioning

confidence: 99%

Photodeposition of Silver on Zinc/Calcium Ferrite Nanoparticles: A Contribution to Efficient Effluent Remediation and Catalyst Reutilization

et al. 2021

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The efficient photodegradation of textile dyes is still a challenge, especially considering resistant azo dyes. In this work, zinc/calcium mixed ferrite nanoparticles prepared by the sol–gel method were coupled with silver by a photodeposition method to enhance the photocatalytic potency. The obtained zinc/calcium ferrites are mainly cubic-shaped nanoparticles sized 15 ± 2 nm determined from TEM and XRD and an optical bandgap of 1.6 eV. Magnetic measurements indicate a superparamagnetic behavior with saturation magnetizations of 44.22 emu/g and 27.97 emu/g, respectively, for Zn/Ca ferrite and Zn/Ca ferrite with photodeposited silver. The zinc/calcium ferrite nanoparticles with photodeposited silver showed efficient photodegradation of the textile azo dyes C.I. Reactive Blue 250 and C.I. Reactive Yellow 145. Subsequent cycles of the use of the photocatalyst indicate the possibility of magnetic recovery and reutilization without a significant loss of efficiency.

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Structural and magnetic properties of sol-gel derived CaFe2O4 nanoparticles

Cited by 39 publications

References 19 publications

CaFe2O4 ferrite nanofibers via solution blow spinning (SBS)

CaFe2O4 ferrite nanofibers via solution blow spinning (SBS)

Greener route for microwave enhanced syntheses of bioactive 1,5‐benzodiazepines using heterogeneous calcium ferrite/graphene oxide nanocomposite as a novel and sustainable catalyst

Photodeposition of Silver on Zinc/Calcium Ferrite Nanoparticles: A Contribution to Efficient Effluent Remediation and Catalyst Reutilization

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