Surfactant based synthesis and magnetic studies of cobalt ferrite
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Surfactant based synthesis and magnetic studies of cobalt ferrite Meenal Gupta1 · Anusree Das2 · Satyabrata Mohapatra1 · Dipankar Das2 · Anindya Datta1 Received: 27 March 2020 / Accepted: 18 July 2020 © Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract Nanoparticles of cobalt ferrite were synthesized by two different surfactants cetyl trimethyl ammonium bromide (CTAB) and sodium dodecyl sulphate (SDS) by the microemulsion method. Formation of cobalt ferrite was confirmed by structural characterization techniques XRD and TEM. The magnetic properties of these systems were studied using Mössbauer spectroscopy and SQUID magnetometry. The study determined the impact of the synthetic procedure and surfactant composition on the nanomaterial characteristics. The overall magnetic response for the material was different compared to the bulk with a major decrease in room temperature magnetic saturation. Magnetic properties were affected by the type of surfactant template due to its impact on the geometry of the synthesized cobalt ferrite nanoparticles.
* Anindya Datta [email protected] Meenal Gupta [email protected] Anusree Das [email protected] Satyabrata Mohapatra [email protected] Dipankar Das [email protected] 1
BFR-206, B Block, University School of Basic and Applied Sciences, Guru Gobind Singh Indraprastha University, Dwarka, Delhi, India 110078
UGC-DAE CSR, Bidhan Nagar, Kolkata, West Bengal, India
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Surfactant based synthesis and magnetic studies of cobalt ferrite
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Keywords Cobalt ferrite · Surfactant · Magnetic · Mössbauer spectroscopy
1 Introduction Magnetic properties associated with materials are heavily modified as these approach nanoscale. Large surface area and quantum nanosize effect contribute towards superparamagnetism and quantum tunnelling [1]. Ferrite magnetic nanoparticles have been found to be crucial materials for application in magnetic resonance imaging (MRI), ferrofluid technology, guided drug delivery, magnetocaloric refrigeration among others. Among ferrites, the spinel ferrites are the source of immense interest because of their cubic symmetry [2–4]. Spinel structure was first observed by Bragg in natural form in MgAl2O4[5]. This type of lattice arrangement was observed and further studied for magnetic nanoparticles such as various ferric oxides or ferrites [6, 7]. The natural preference of oxides for the spinel FCC structure due to its stability has inspired the study of the impact on various chemical and physical properties of spinel ferrites by introducing disturbance to such an ordered system [8]. Cobalt ferrite nanoparticle has a mixed inverse spinel structure with divalent cobalt cations and trivalent ferric cations distributed at tetrahedral (A) and octahedral (B) sites in its lattice [9]. Its chemical stability and magnetic hardness facilitate its applications in magnetic refrigeration, high-density recording, spintroni
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