Shape control of nickel crystals and catalytic hydrogenation performance of ruthenium-on-Ni crystals

Nickel crystals with various shapes were obtained via hydrothermal synthesis. The effect of temperature and surfactant on nickel morphology was studied.

Molecular dynamics studies of irradiation effects on hydrogen isotope diffusion through nickel crystals and grain boundaries

Molecular dynamics construction of the Arrhenius plot accounts for all possible diffusion paths in defective materials.

Synthesis of Carbon-Silica Nanomaterials by Carbonization of Cellulose Acetate and Polyisocyanate Copolymer

Cellulose acetate and polyisocyanate copolymer synthesized by mechanical mixing of cellulose acetate, polyisocyanate and fumed silicon dioxide in the presence of nickel chloride was carbonized in silicon dioxide template. Copolymer and silicon dioxide template were formed simultaneously. Composite structure and composition was studied with SEM and EDS. SEM showed that porous carbonaceous nanomaterial was synthesized. Formed carbon is represented by coating on silicon dioxide, layered ribbon-like and fibrous structures in template pores with size from several nm (thickness) to several microns (length). Metallic nickel crystals up to 200 nm in size were fabricated in composite pores from Nickel chloride by reduction of Ni2 with products of pyrolysis of organic compounds.

Synthesis and the Structural Transformation of fcc to hcp in Ni-Graphene Nanocomposite by Simple Chemical Route via Sonication

We report the synthesis and structural transformation of fcc to hcp in Ni-graphene (Ni-Gr) composite by simple chemical route via sonication. The syntheses of Ni-Gr composite by simultaneous reduction method, and the effect of different composition ratio on morphology and crystal structure were examined in our present study. The results indicated that the graphene ratio played an important role in crystal structure and d-spacing in nickel crystals. Different compositions have shown different behavior. The nanonickel clusters of various shapes with coated graphene and decorated as nickel on graphene sheets are observed. The synthesized composites were characterized using X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), and transmission electron microscope (TEM). The XRD patterns indicated crystal lattice modifications in some composites while composites with a higher graphene ratio produced very small crystals with uniform lattice parameter and d-spacing. FE-SEM images indicated the growth of Datura fruit like shapes of nickel clusters in higher composition of nickel while the composites with least concentration of nickel were composed of cubical nanoparticles grown on graphene sheets. TEM analysis revealed many Ni nanoparticles surrounding the smooth petals like surface of graphene, with average diameters of spiky nickel nanoparticles being about 50 nm and 124 nm, respectively, on 200 nm of scale.

The Crystallization Research on the Zr-Based Bulk Metallic Glasses by Ion Thinning

Transmission Electron Microscope (TEM) and X-Ray Diffraction (XRD) were used to investigate crystallization of the Zr70Cu8Ti7Ni15 bulk amorphous alloy, the results show that the edge region of BMGs sample produces nanosize Nickel crystals using the method of the ion thinning to make the TEM sample. The quantity of nanocrystals is proportional to the time of ion thinning and they are not residual crystals in the BMGs.