Preparation and Characterization of a Superparamagnetic Polymer Nanocomposite

Fe(CO)$_{5}$ decomposition produced ferro- and superparamagnetic polymer nanocomposites. Fe(CO)$_{5}$ and Cloisite 20A clay were combined in a closed vial for 12 hours, then opened to air for 2 hours. M\"{o}ssbauer analysis indicated formation of Fe$_{2}$O$_{3}$ on clay; mass analysis indicated 12{\%} Fe in clay. A Brabender mixed Fe$_{2}$O$_{3}$/clays with PMMA and EVA at ratios by mass of 9:4:36 and 1:1:4 respectively (Fe(CO)$_{5}$:clay:polymer). TEM displayed Fe$_{2}$O$_{3}$ nanoparticles, 3.3 $^{+}$ 0.8 nm in diameter, adsorbed on exfoliated clay platelet surfaces in polymer matrices. VSM data indicated superparamagnetism with moments of 510.3 emu/g$_{(Fe2O3)}$ (PMMA) and 8.46 emu/g$_{(Fe2O3)}$ (EVA). DMA showed 37{\%} decreased dynamic modulus (EVA) and 11{\%} (PMMA) due to Fe$_{2}$O$_{3}$. TGA indicated PMMA stability to 400$^{o}$C (9.3{\%} mass residual) and EVA to 435$^{o}$C (11{\%} mass residual). Cell adhesion tests showed Fe$_{2}$O$_{3}$/clay enhanced proliferation, promising applications in bone implants.