Both of chitosan (CS) and magnetite are biocompatible and biodegradable materials. In this study, natural CS/magnetite nanocomposite was prepared with in situ precipitation. Surface morphology, magnetite nanoparticles size and investigation of nanocomposite composition More
Both of chitosan (CS) and magnetite are biocompatible and biodegradable materials. In this study, natural CS/magnetite nanocomposite was prepared with in situ precipitation. Surface morphology, magnetite nanoparticles size and investigation of nanocomposite composition was done with scanning electron microscope(SEM), Transmition electron microscope(TEM) and Fourier transform infrared (FTIR). Magnetite nanoparticles and its crystal size investigation were done with X-ray diffraction (XRD) which was 23.5 nm.magnetic properties measurements were done with Vibrating sample magnetometer (VSM) which saturated magnetization was 3.04 emug-1 and cohersive force was 128.39Oe. Chitosan/magnetite nanocomposite with lower contents of magnetite had lower saturated magnetization. This nanocompoaite was superparamagnetic. For investigation of viability, samples cultured in the presence of stem cells and results show that this nanocomposite has biocompatibility.
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Electroless nickel boron coatings usually due to wear and corrosion resistance that is well regarded. Electroless nickel boron through the chemical reduction of nickel ions on the surface of the catalytic caused and controlled until the solution is in contact with the r More
Electroless nickel boron coatings usually due to wear and corrosion resistance that is well regarded. Electroless nickel boron through the chemical reduction of nickel ions on the surface of the catalytic caused and controlled until the solution is in contact with the reaction continues. In this study, Ni-B-ZrO2 nano composite coating was made by adding 4 g⁄l of ZrO2 nano particles to nickel – boron electroless solution on samples of CK45 steel; Then the coated samples heat treated for one hour at 400℃. The morphology and chemical compound was examined using SEM equipped by EDX. Electrochemical corrosion behavior of coatings in 3.5 showed by adding ZrO2nano particles the corrosion resistant of coatings improves. Electrochemical impedance spectroscopy showed that the coating after the heat treatment hadn't a protective effect And substrate are vulnerable to corrosion. Abrasion behavior by pin on disk test was measured at ambient temperature and Vickers hardness was measured by a micro hardness testing machine devices. The results showed that adding zirconia nanoparticles to the amount of 4g⁄l increased hardness and wear resistance of the coating. Coating composite samples of nickel - boron – zirconia without heat treatment the best results for the three parameters simultaneously high hardness, abrasion resistance and excellent corrosion resistance was good.
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In this paper wrought aluminum sheets with thickness of 5 mm were square butt welded by friction stir lap welding (FSLW) and gas tungsten arc lap welding (GTALW) methods to campare their corrosion behavior. of the welding zone was probed by tafel polarization curve. Opt More
In this paper wrought aluminum sheets with thickness of 5 mm were square butt welded by friction stir lap welding (FSLW) and gas tungsten arc lap welding (GTALW) methods to campare their corrosion behavior. of the welding zone was probed by tafel polarization curve. Optical metallography (OM) and scaninig electron microscop (SEM) were used to study morphology. Energy dispersive spectroscopy (EDS) were used to analysis different zone of the welds. EDS analysis proved deposits of iron and silicon in samples. FSLW and GTALW resulted in equiaxed grains of about 5 and 18 micrometr respectively, while GTALW caused dendritic structure of the welded region. To assessment mechanical properties, micro hardness test were accure. Resistance to corrosion was greater for the FSLW grains than the GTALW structure. In both cases, susceptibility to corrosion attack was greater in the welded region than the base metal section. . microhardness of FSLW specimen were grater than GTALW specimen.
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