Solvothermal synthesis of CoFe2O4 hollow spheres

Polyvinylpyrrolidone (PVP) in nanoparticle synthesis

“…152 These researchers noticed different magnetic behaviours among the CoFe 2 O 4 -PVP nanocomposites prepared using small or large CoFe 2 O 4 NPs. Hollow CoFe 2 O 4 spheres composed of smaller NPs were synthesized solvothermally with either PVP or PEG, together with oleic acid, NaAc, FeCl 3 and CoCl 2 at 200 o C. 153 A solvothermal route was used also for the preparation of Co 0.8 Ni 0.2 Fe 2 O 4 NPs with EG as solvent. The as-prepared NPs were modified by silane A and the resulting materials were dispersed ultrasonically in a PVP-ethanol solution to yield Co 0.8 Ni 0.2 Fe 2 O 4 /PVP composite nanofibers.…”

Fabrication of CoFe2O4 hollow fibers by direct annealing of the electrospun composite fibers and their magnetic properties

“…3 As a kind of magnetic materials, cobalt ferrite (CoFe 2 O 4 ) has received more and more research attention because of its large magnetocrystalline anisotropy and magnetostriction, chemical and mechanical stability, and unique non-linear spinwave properties, as well as its applications potentials in high-density magnetic storage media, high-performance electromagnetic and spintronic devices. [4][5][6][7] Therefore, various morphologies nanostructure including hollow spheres, 8,9 octahedral, 10 nanorings, 11 nanowires, 12 nanofibers, 13 and nanotubes 14 have been prepared by numbers of synthesis approaches. Among these morphologies, one-dimensional magnetic nanomaterials have considerable importance due to their longest axial ratio among the 1D nanoctructures which are expected to have unique magnetism.…”

Structure and magnetic properties of nanocrystalline cobalt ferrite powders synthesized using organic acid precursor method

“…It is worth mentioning that, most of the magnetic properties of CoFe 2 O 4 strongly depend on the size and the shape of the nanoparticles, which are closely related to the preparation method. Various preparation techniques have been accordingly developed to produce CoFe 2 O 4 nanoparticles including chemical co-precipitation [2,[7][8][9][10], microemulsion [11][12][13], sol-gel method [14,15], hydrothermal [16][17][18], solvothermal [19], organic precursor method [20][21][22][23][24], ball milling [25,26], forced hydrolysis in a polyol medium [27][28][29], mechanochemical method [30,31], sonochemical [32] and complexometric synthesis [22,33].…”