In this research, a simple and efficient cathodic electrochemical deposition (CED) route was developed for the preparation of magnetite nanoparticles (NPs) in an aqueous media. The surface of magnetite NPs was also coated for the first time via an in situ procedure during the CED process. In this method, initially, the Fe3O4 NPs (with size ~10 nm) were prepared from the Fe2+/Fe3+ chloride bath through CED process. Then, dextran as the coating agent was coated on the surface of Fe3O4 NPs during the CED process. The prepared NPs were characterized by different techniques such as XRD, FE-SEM, TEM, IR, TGA, DLS and VSM. The XRD results proved the pure magnetite i.e. Fe3O4 crystal phase of the prepared samples. Morphological observations through FE-SEM and TEM revealed particle morphology with nano-sizes of 8 nm and 12 nm for the naked and dextran coated NPs, respectively. The dextran coat on the surfaces of NPs was confirmed by FT-IR and DSC-TGA analyses. The average hydrodynamic diameters of 17 nm and 54 nm were measured from DLS analysis for the naked and dextran coated NPs, respectively. The magnetic analysis by VSM revealed that prepared NPs have superparamagnetic behavior i.e. Ms= 82.3 emu g–1, magnetization Mr= 0.71 emug–1 and Ce= 2.3 Oe for the naked NPs, and Ms= 43.1 emu g–1, Mr =0.47 emu g–1 and Ce=0.81Oe for the dextran coated NPs. These results implied that this electrochemical strategy can be recognized as an effective preparation method of polymer coated Fe3O4 NPs. پرونده مقاله

In this paper, a rapid and room temperature electrochemical method is introduced for preparation of Ni doped iron oxide nanoparticles (Ni-IONs) grafted with ethylenediaminetetraacetic acid (EDTA) and polyvinyl alcohol (PVA). EDTA/Ni-IONs and PVA/Ni-IONs samples were prepared through base electro-generation on the cathode surface from aqueous solution of iron(II) chloride, iron(III) nitrate and nickel chloride salts with EDTA/PVA additive. Uniform and narrow particle size Ni-IONs with an average diameter of 15 nm was achieved. Ni doping into the crystal structure of synthesized IONs and also surface grafting with EDTA/or PVA were established through FT-IR and EDAX analyses. The saturation magnetization values for the resulting EDTA/Ni-IONs and PVA/Ni-IONs were found to be 38.03 emu/g and 33.45 emu/g, respectively, which proved their superparamagnetic nature in the presence of applied magnetic field. The FE-SEM observations, XRD and VSM data confirmed the suitable size, crystal structure and magnetic properties of the prepared samples for uses in biomedical aims پرونده مقاله

In this paper, a rapid and room temperature electrochemical method is introduced in preparation of Ni doped iron oxide nanoparticles (Ni-IONs) grafted with ethylenediaminetetraacetic acid (EDTA) and polyvinyl alcohol (PVA). EDTA/Ni-IONs and PVA/Ni-IONs samples were prepared through base electro-generation on the cathode surface from aqueous solution of iron(II) chloride, iron(III) nitrate and nickel chloride salts with EDTA/PVA additive. Uniform and narrow particle size Ni-IONs with an average diameter of 15 nm was achieved. Ni doping into the crystal structure of synthesized IONs and also surface grafting with EDTA/or PVA were established through FT-IR and EDAX analyses. The saturation magnetization values for the resulting EDTA/Ni-IONs and PVA/Ni-IONs were found to be 38.03 emu/g and 33.45 emu/g, respectively, which proved their superparamagnetic nature in the presence of applied magnetic field. The FE-SEM observations, XRD and VSM data confirmed the suitable size, crystal structure and magnetic properties of the prepared samples for uses in biomedical aims. پرونده مقاله

In this research, a simple and efficient cathodic electrochemical deposition (CED) route wasdeveloped for the preparation of magnetite nanoparticles (NPs) in an aqueous media. Thesurface of magnetite NPs was also coated for the first time via an in situ procedure during theCED process. In this method, initially, the Fe3O4 NPs (with size ~10 nm) were prepared from theFe2+/Fe3+ chloride bath through CED process. Then, dextran as the coating agent was coatedon the surface of Fe3O4 NPs during the CED process. The prepared NPs were characterizedby different techniques such as XRD, FE-SEM, TEM, IR, TGA, DLS and VSM. The XRD resultsproved the pure magnetite i.e. Fe3O4 crystal phase of the prepared samples. Morphologicalobservations through FE-SEM and TEM revealed particle morphology with nano-sizes of 8nm and 12 nm for the naked and dextran coated NPs, respectively. The dextran coat on thesurfaces of NPs was confirmed by FT-IR and DSC-TGA analyses. The average hydrodynamicdiameters of 17 nm and 54 nm were measured from DLS analysis for the naked and dextrancoated NPs, respectively. The magnetic analysis by VSM revealed that prepared NPs havesuperparamagnetic behavior, i.e. Ms=82.3 emu g–1, magnetization Mr=0.71 emug–1 and Ce=2.3Oe for the naked NPs, and Ms=43.1 emu g–1, Mr=0.47 emu g–1 and Ce=0.81Oe for the dextrancoated NPs. These results implied that this electrochemical strategy can be recognized as aneffective preparation method of polymer coated Fe3O4 NPs. پرونده مقاله