Fauziatul Fajaroh

Synthesis of Fe3O4 Nanoparticles using PEG Template by Electrochemical Method

One of the nanoparticles which have been developed is magnetite. Due to its magnetism and reactivity, this particle can be used in various fields including technology, environment, and biomedical. One simple method to synthesize magnetite is electro-oxidation of iron in the water. The particle size produced by this method can be adjusted by controlling the electrochemical cell parameters. Unfortunately, this method usually releases polydispersed particles. One solution to overcome this problem is by using an in situ PEG in the synthesis process. In this research, PEG 6000 was chosen as a template, so the synthesis process was performed by electro-oxidation of iron in the dilute solution of PEG. Particles with an average diameter of 62.5 nm were obtained. The monodispersity, surface area, and crystallinity of the particles increased in this way. The specific surface area increased from 55.322 to 391.314 m2/g. The results of XRD and FTIR analysis showed that PEG acted as a template in the synthesis process. In addition, the yield obtained with PEG template was larger than without the template. This method is quite promising as a way of synthesis of magnetite nanoparticles.

The electrolysis time on electrosynthesis of hydroxyapatite with bipolar membrane

The electrochemical method with bipolar membrane has been successfully used for the synthesis of hydroxyapatite. In this work, we have developed 2 chambers electrolysis system separated by a bipolar membrane. The membrane was used to separate cations (H+ ions produced by the oxidation of water at the anode) and anions (OH− ions produced by the reduction of water at the cathode). With this system, we have designed that OH− ions still stay in the anions chamber because OH− ions was very substantial in the hydroxyapatite particles formation. The aim of this paper was to compare the electrolysis time on electrosynthesis of hydroxyapatite with and without the bipolar membrane. The electrosynthesis was performed at 500 mA/cm2 for 0.5 to 2 hours at room temperature and under ultrasonic cleaner to void agglomeration with and without the bipolar membrane. The electrosynthesis of hydroxyapatite with the bipolar membrane more effective than without the bipolar membrane. The hydroxyapatite has been appeared at 0.5 h ...

Phase Control of TiO2 Prepared by TiCl4 Hydrolysis and Electrochemical Method

The phase structure of TiO 2 dependent on applications. It is importat to develop an effective method to control the phase structure of TiO 2 . In this study, the TiO2 was synthesized by TiCl 4 hydrolysis method. The control of hydrolysis was done by electrochemical method in a cell consisting of two plate carbon as electrodes. The electrodes distance was set to 2.6 to 4 cm and immersed in solution at dimensions of (5 × 2) cm. The electrodes were connected to the positive and negative terminals of a DC power supply for 1 to 2.5 hours. The voltage was varied from 5 to 15 V at constant stirring and room temperature. The resulted suspension was aged for 48 hours. The solution was filtered. The powder dried directly in an oven at 150°C for 2 hours, washed 2 times, and dried again 60 °C for 6 hours. In this work, the voltage, electrode distance, and TiCl 4 initial concentration can control the phase structure of TiO 2 .

Synthesis of Magnetite Nanoparticles by Electrochemical Method Using Pulsed-Direct Current

Magnetite (Fe3O4) is one of the most important magnetic materials and is widely used in industry. In recent years, monodispersed magnetite nanoparticles have attracted increasing attention due to their good biocompatibility, strong superparamagnetic properties, low toxicity and easy preparation process [1]. Magnetite nanoparticles find many applications in the biomedical industry, such as targeted drug delivery, hyperthermia treatment, cell separation, magnetic resonance imaging, immunoassays and the separation of biochemical products [2]. They are also useful for environmental processes, such as the treatment of water and wastewater [3].

Influence of the Synthesis Conditions on the Properties of Fe3O4 Nanoparticles Prepared by Surfactant‐Free Electrochemical Method

We have been succesfully synthesized monodispersed magnetite nanoparticles by electro‐oxidation of iron in plain water without using any surfactant. The characteristics of particles produced, i.e., crystallinity, size, and magnetic behavior, are influenced by the synthesis conditions including the current density and the inter‐electrodes distance. The crystallinity and size of particles increase by increasing the current density and by decreasing the inter‐electrodes distance. The mean size of magnetite nanoparticles produced by this method ranging from 10 to 30 nm depending on the synthesis conditions. Although there are some impurities in the form of FeOOH, which is a non‐magnetic material, the nanoparticles still exhibit ferromagnetic behavior with a relatively high saturation magnetization ranging from 60 to 70 emu.g− and a coercivity ranging from 140 to 295 Oe depending on the synthesis condition. This simple method appears to be a promising synthetic route to producing magnetite nanoparticles for ma...