Preparation of a nanocomposite of magnetic, conducting nanoporous polyaniline and hollow manganese ferrite

Abstract

A nanocomposite of conducting, protonated, polyaniline and hollow MnFe 2 O 4 was successfully synthesized by in situ selfassembly polymerization. First, core-shell hollow spheres of MnFe 2 O 4 were fabricated by template polymerization, in which ferrite nanoparticles were coated onto the surface of functionalized core polystyrene (PS) spheres, and the core polymer was subsequently removed by calcination. Fourier transform infrared spectroscopy spectra of the ferrite-coated PS spheres and MnFe 2 O 4 hollow spheres confirmed the elimination of the organic template after calcination. Scanning electron microscopy images revealed that the resultant composite was structurally nanoporous. The shape and holes of the MnFe 2 O 4 spheres were investigated by transmission electron microscopy. In addition, the magnetic properties of the nanocomposite and MnFe 2 O 4 were characterized on a vibrating sample magnetometer with maximum saturation magnetization values of 1.59 and 66.7 emu g À1 , respectively. The X-ray diffraction patterns of the ferrite sample agreed well with the standard pattern of the cubic structure. Atomic force microscopy was used for surface morphology analysis.

Fabrication and adsorption properties of magnetic graphene oxide nanocomposites for removal of arsenic (V) from water

“…Besides, to investigate adsorption capacity, the experimental data were applied to the Langmuir and Freundlich isotherm models. The linear equations for isotherm models are expressed as follows (equations (5) and (6)) where q m (mg/g) is the maximum adsorption capacity, k 1 (l/mg) is the Langmuir constant, and n and k f (l/mg) are the Freundlich constants (Hosseini et al., 2011).…”

“…where q m (mg/g) is the maximum adsorption capacity, k 1 (l/mg) is the Langmuir constant, and n and k f (l/mg) are the Freundlich constants (Hosseini et al, 2011).…”

Enhanced magnetic properties of polymer-magnetic nanostructures synthesized by ultrasonication

“…At low temperatures (~32 K) of 0.2PUNCF (ZFC), the moment was decreased (0.0135 emu/g) may be due to blocking of particle moment in chaotic directions. The magnetic moment of 0.2PUNCF (ZFC) was enhanced with increase in temperature and it was saturated (0.0482 emu/g) above 350 K could be due to deliberate rotation of the magnetization of thermal hindered particles moment in the direction of field [40][41]. FC of 0.2PUNCF, the moment decreased with increase in temperature and at low temperature (5 K), it increased to 0.102 emu/g.…”

Thermal infrared and microwave absorbing properties of SrTiO3/SrFe12O19/polyaniline nanocomposites

“…The thermal infrared is also a part of the solar spectrum and thus can be exploited for satellite measurements that operate in solar occultation mode [1]. Today, since many types of radar absorbing materials are commercially available and, the most cost effective means of shielding radar radiation, controlling electromagnetic interference and dissipating electrostatic charge is to use magnetic or dielectric fillers [2,3] or intrinsically conducting polymers [4][5][6][7]. Conductive polymers by having conjugated double bonds have important roles in creating the electric current and in the absorption of electromagnetic waves are also very effective.…”