Resumo

TONG, Ruili et al. Study of preparation and properties on polymer-modified magnetite nanoparticles. S.Afr.j.chem. (Online) [online]. 2015, vol.68, pp.99-104. ISSN 1996-840X.  http://dx.doi.org/10.17159/0379-4350/2015/V68A15.

In this paper, polyacrylamide (PAM)-modified magnetite (Fe₃O₄) 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 nano-particles 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 Fe₃O₄ nanoparticles possessed superparamagnetic property and super dispersion stability in aqueous solution after PAM modification.

Palavras-chave : Magnetite (Fe₃O₄); nanoparticles; superparamagnetism; polymer modification; colloidal stability.

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