Facile room temperature CTAB-assisted synthesis of mesoporous nano-cobalt ferrites for enhanced magnetic behaviour. (April 2018)

• Record Type: Journal Article
• Authors: C., Amirthavalli; Thomas, Jisha Mary; K., Nagaraj; A.A.M., Prince
• Is Part Of: Materials research bulletin. Volume 100(2018)
• Page Start: 289
• Page End: 294
• Publication Date: 2018-04
• Subjects: Ferrites -- Cobalt ferrites -- Cationic surfactant -- BET -- Mesoporous -- Magnetic property; Materials -- Periodicals; Crystal growth -- Periodicals; Matériaux -- Périodiques; Cristaux -- Croissance -- Périodiques; Crystal growth; Materials; Periodicals; 620.11
• DOI: 10.1016/j.materresbull.2017.12.026
• Languages: English
• ISSNs: 0025-5408

Abstract

Graphical abstract: 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 (Ms and Hc ) 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.