Facile room temperature CTAB-assisted synthesis of mesoporous nano-cobalt ferrites for enhanced magnetic behaviour

Journal Article · Sun Apr 15 00:00:00 EDT 2018 · Materials Research Bulletin

DOI:https://doi.org/10.1016/J.MATERRESBULL.2017.12.026· OSTI ID:22803920

Thomas, Jisha Mary; Nagaraj, K. ^[1]; Prince, A. A.M. ^[2]

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1. Department of Chemistry, Madras Christian College, Chennai 600 059, Tamil Nadu (India)
2. Department of Chemistry, Ramakrishna Mission Vivekananda College, Chennai 600 004, Tamil Nadu (India)

Highlights: • Synthesis of mesoporous nano-cobalt ferrites are carried out CTAB medium. • Crystalline cobalt ferrite phase was formed below CMC of CTAB. • Bilayer arrangement of CTA-OH-Fe-Co growing units leads to inter-particle pores. • Enhanced magnetic properties (M{sub s} and H{sub c}) were obtained in synthesized cobalt ferrites. - Abstract: We report a facile, room temperature synthesis of nanostructured mesoporous cobalt ferrites using the cationic surfactant, cetyltrimethylammonium bromide (CTAB). The synthesis was carried out at various concentrations of CTAB ranging from its pre- to post-micellar concentrations. The pristine and calcined samples exhibit pure cobalt ferrite phase which are confirmed by XRD studies. The morphology of all uncalcined samples was quasi-spherical as shown by TEM images. Nitrogen adsorption – desorption study on pristine samples indicates the presence of mesopores in them. The magnetic properties of the uncalcined and calcined samples were studied by vibrating sample magnetometry. Coercivity and saturation magnetization were found to vary with the concentration of the CTAB employed. Also, the pristine samples were soft magnets, whereas the calcined samples tended towards exhibiting hard magnetism. We have proposed a mechanism to explain the mesoporosity of nanostructured ferrite based the role of CTAB in the present synthetic method.

• OSTI ID: 22803920
• Journal Information: Materials Research Bulletin, Vol. 100; Other Information: Copyright (c) 2017 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); ISSN 0025-5408
• Country of Publication: United States
• Language: English

Related Subjects

77 NANOSCIENCE AND NANOTECHNOLOGY
ADSORPTION
AMMONIUM COMPOUNDS
COBALT COMPOUNDS
COERCIVE FORCE
CONCENTRATION RATIO
DESORPTION
FERRITES
MAGNETIC PROPERTIES
MAGNETIZATION
MAGNETS
MORPHOLOGY
NANOMATERIALS
NANOSTRUCTURES
NITROGEN
SYNTHESIS
TEMPERATURE RANGE 0273-0400 K
TRANSMISSION ELECTRON MICROSCOPY
X-RAY DIFFRACTION