جستجوی مقالات مرتبط با کلیدواژه "فرسایش لیزری" در نشریات گروه "مواد و متالورژی"

In this research, copper nanoparticles were synthesized via laser ablation in liquid using a nanosecond Nd:YAG laser. First, the effect of wavelengths of 532 nm and 1064 nm on the synthesis of copper nanoparticles in acetone and distilled water was investigated. After finding the appropriate wavelength, the effect of synthesis media in the presence of surfactants containing cetyltrimethylammonium chloride, sodium dodecyl sulfate, and polyvinyl pyrrolidone on copper nanoparticles was studied. Visible-ultraviolet optical spectroscopy, atomic absorption spectroscopy, dynamic light diffraction, and field emission scanning electron microscopy were employed to investigate the optical properties, synthesis efficiency, size, and morphology of copper nanoparticles prepared by the laser ablation in liquid method, respectively. The results showed that copper nanoparticles could be successfully synthesized in an acetone medium at 1064 nm wavelength. Also, due to the formation of copper oxides instead of copper nanoparticles, there is a slight possibility of preparing copper nanoparticles in aqueous environments.

In this research, Cu/Ag core-shell nanoparticles were synthesized by laser ablation in liquid using a nanosecond Nd:YAG laser. The synthesis of Cu/Ag core-shell nanoparticles by the laser ablation in liquid method was done in a single step by setting the process parameters at 450 mj/pulse energy, 1064 nm wavelength, 3 Hz frequency and 6 mm/s scanning speed in an acetone environment. Characterization of the synthesized nanoparticles using ultraviolet visible spectroscopy (UV-Vis), atomic absorption spectroscopy (AAS), dynamic light scattering (DLS), field emission scanning electron microscopy (FESEM), high resolution transmission electron microscopy (HRTEM), and X-ray diffraction (XRD) were performed. The investigations confirmed that CACS nanoparticles had nanometric size, spherical morphology, and core-shell structure of pure copper/silver.