Magnetite (Fe3O4) nanoparticles becomes a new innovation that gets attention of biomedicine scientists. Magnetite can be applied to cancer treatment as a drug carrier because it’s good biocompatibility and very low toxicity. The purpose of this study was to determine the effect of temperature and stirring rate on the magnetite particle characteristics prepared by co-precipitation method. Firstly, FeCl3 and FeCl2 with 2:1 mole ratio were reacted with 10% NH4OH at 40 - 80°C temperatures and stirring speed of 300 - 500 rpm in a beaker glass. Subsequently, the precipitate was separated using filter paper and it dried into air oven at 100°C. The properties of obtained magnetite powder were determined using XRD and SEM. From XRD pattern indicates that magnetite formed at all temperatures with crystallite diameter in the range of 10-12 nm. The SEM results indicate the agglomeration of the magnetite particles with size in the range of 2.7 to 3.3 μm. In the other hand, the higher of temperature and stirring rate of agitation will make the agglomeration of the particles become more uniform. The increasing of temperature and the stirring rate will increase the magnetite crystallinity level.
Stainless steel 316L is a metal which used as bone plate, however this metal has low biocompatibility in a human body. For increasing their biocompatibility, the stainless steel 316L need to be coated with hydroxyapatite (HA). The purpose of this research is to study the effect of applied voltage and deposition time on the properties of HA coated 316L stainless steel. Stainless steel 316L was cut into 20×20×1 mm3 dimension then HA solution was prepared in ethanol solution used magnetic stirrer for 2 hours and 200 rpm. The HA powder was deposited by electrophoretic deposition (EPD) using carbon as anode and stainless steel 316L as cathode. Powder was coated on stainless steel substrate at 40, 50 and 60 volt and deposition time 10, 20, and 30 minutes. Thickness of HA layer on substrate increased, as the time deposition increased with resultof 35 μm, 50 μm and 60 μm at deposition 50 volt and deposition time of 10, 20 and 30 minutes. Thickness HA coatings can decrease the corrosion of stainless steel, in deposition time 10, 20, and 30 minutes is 0.91, 0.704, and 0.56 mpy. at applied voltage 50 volt and deposition time 30 minutes was obtained suitable for bone plate.
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