Abstract
The incorporation of magnetic barium hexaferrite nanoparticles in a transparent polymer matrix of poly(methyl methacrylate) (PMMA) is reported for the first time. The barium hexaferrite nanoplatelets doped with Sc3+, i.e., BaSc0.5Fe11.5O12 (BaHF), having diameters in the range 20 to 130 nm and thicknesses of approximately 5 nm, are synthesized hydrothermally and stabilized in 1-butanol with dodecylbenzenesulfonic acid. This method enables the preparation of monolithic nanocomposites by admixing the BaHF suspension into a liquid monomer, followed by in-situ, bulk free-radical polymerization. The PMMA retains its transparency for loadings of BaHF nanoparticles up to 0.27 wt.%, meaning that magnetically and optically anisotropic, monolithic nanocomposites can be synthesized when the polymerization is carried out in a magnetic field. The excellent dispersion of the magnetic nanoparticles, coupled with a reasonable control over the magnetic properties achieved in this investigation, is encouraging for the magneto-optical applications of these materials.
Highlights
The development of polymer-basedcomposites that incorporate inorganicparticles into organic polymers makes it possible to adjust their mechanical, thermal, electrical, optical and magnetic properties, depending on the intrinsic properties of the inorganic material[1,2,3]
The monomer methyl methacrylate (MMA) exhibits a good miscibility with iron oxide nanoparticles coated with oleic acid, but agglomeration can occur during the polymerization step
In this contribution we report, for the first time, about a synthesis procedure that allows for the integration of magnetic monodomain barium hexaferrite nanoparticles with the nominal composition of BaSc0.5Fe11.5O12 (BaHF), and with an anisotropic, plate-like shape, into a polymer composite exhibiting a MO response
Summary
Gregor Ferk[1], Peter Krajnc[1], Anton Hamler[2], Alenka Mertelj[3], Federico Cebollada[4], Miha Drofenik1,5 & Darja Lisjak[5]. The incorporation of magnetic barium hexaferrite nanoparticles in a transparent polymer matrix of poly(methyl methacrylate) (PMMA) is reported for the first time. The barium hexaferrite nanoplatelets doped with Sc3+, i.e., BaSc0.5Fe11.5O12 (BaHF), having diameters in the range 20 to 130 nm and thicknesses of approximately 5 nm, are synthesized hydrothermally and stabilized in 1-butanol with dodecylbenzenesulfonic acid. This method enables the preparation of monolithic nanocomposites by admixing the BaHF suspension into a liquid monomer, followed by in-situ, bulk free-radical polymerization. It is of crucial importance to retain the transparency of the polymer after the incorporation of the nanoparticles; this transparency can be lost due to Rayleigh scattering from large
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