Study of preparation and properties on polymer-modified magnetite nanoparticles

Abstract

In this paper, polyacrylamide (PAM)-modified magnetite (Fe 3 O 4 ) nanoparticles were prepared by in situ polymerization in aqueous solution. The particle size, morphology, crystal phase and magnetic properties were measured utilizing scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier-transform infrared spectroscopy (FTIR), X-ray diffraction (XRD) and vibrating sample magnetometer (VSM), respectively. The size distribution and stability of the nanoparticles in aqueous solution were evaluated using the laser particle size analyzer and ultraviolet-visible spectroscopy (UV-vis). The influences of the dose of acrylamide (AM) and the pH value on the particle size and stability were also examined. The results showed that the Fe 3 O 4 nanoparticles possessed superparamagnetic property and super dispersion stability in aqueous solution after PAM modification.

Synthesis and Characterization of Bi-Functional Poly (Acrylic Acid-Co-2-hydroxyethylmethacrylate) Coated Iron Oxide Magnetic Composite Particles

“…Various approaches to the synthesis of magnetic polymer particles have been investigated [3][4][5][6][7][8]. These include the coprecipitation of ferrous and ferric salts under alkaline conditions in presence of either polymers or surfactants, cross-linking of functional polymers in an emulsifierstabilized magnetic nanoparticle dispersion and layer-bylayer self-assembly of alternating layers of polyelectrolyte and magnetic nano-particles onto colloidal templates [9][10][11].…”

Co(II) anchored glutaraldehyde crosslinked magnetic chitosan nanoparticles (MCS) for synthesis of 2,4,5‐trisubstituted and 1,2,4,5‐tetrasubstituted imidazoles

“…Various polymeric materials have been used for the surface modification of magnetic nanoparticles. [37][38][39][40][41][42] So in continuation of our previous efforts towards a green environmental approach in heterogeneous catalysis, [43,44] in the work reported here we developed a simple and efficient method for the formation of MCSGT@Co(II) magnetic catalyst as shown in Scheme 1. We used chitosan as a material for the surface modification of Fe 3 O 4 magnetic nanoparticles due to its significant properties like ready availability, non-toxicity, biocompatibility, biodegradability, antibacterial property, low immunogenicity and chemical properties (polycationic, hydrophilicity, reactive groups, etc.…”