Methods: Novel approach on synthesis of Ni nanoparticles using NiCl2 as precursor and aqueous extract of Desmodium gangeticum root as the reducing agent. Nanoparticles were characterized for its average size, morphology, functional moieties and thermal stability by UV-Visible spectrophotometry, X-Ray Diffractometry (XRD), Scanning Electron Microscopy (SEM), Fourier Transform Infrared spectroscopy (FTIR) and Thermo Gravimetric Analysis (TGA) respectively. Cytotoxicity was also determined against LLC PK1 cell lines using LDH assay.
The synthesis of nickel nanoparticles by the reduction of nickel chloride with hydrazine in the cationic water-in-oil microemulsions of water/CTAB (cetyltrimethylammonium bromide)/-hexanol at 73 °C has been studied. By the analyses of electron diffraction pattern and X-ray diffraction, the resultant particles were characterized to be the pure nickel crystalline with a face-centered cubic (fcc) structure. The investigation on the composition of microemulsion solution indicated that the average diameter of nickel nanoparticles was affected mainly by the ratio of CTAB to -hexanol instead of the size of microemulsion droplets. Smaller particles could be obtained at higher ratios of CTAB to -hexanol. At a constant nickel chloride concentration, the average diameter of nickel nanoparticles decreased with the increase of hydrazine concentration and then approached to a constant value when the concentration ratio of hydrazine to nickel chloride was above 10. At a sufficient high hydrazine concentration, the average diameter of nickel nanoparticles was independent of nickel chloride concentration. The effects of microemulsion composition and the concentrations of hydrazine and nickel chloride on the particle size are discussed in detail. The magnetic measurements for a typical sample with an average diameter of 4.6 nm showed that the resultant nickel nanoparticles were superparamagnetic due to extremely small size. The saturation magnetization (26.2 emu/g), remanent magnetization (0.67 emu/g), and the coercivity (7.5 Oe) were significantly smaller than those of the bulk nickel, reflecting the nanoparticle nature. In addition, the magnetization was observed to increase with the decrease of temperature due to the decrease in thermal energy.
Zinc Oxide—From Synthesis to Application: A Review - MDPI
Anovel and simple technique for the synthesis of self-protected nickelnanoparticles is realized by the inter-matrix synthesis of nickelnanoparticles by cation exchange reduction in two types of resins.
Polyol Synthesis of Silver Nanoparticles: ..
In summary, we provided a novel cost effective green approach for the synthesis of Ni nanoparticle using Desmodium gangeticum aqueous root extract. We prepared stable nanoparticle aggregates with spherical geometry and size of around 23 nm. The synthesised nanoparticle is safe for the use as it did not show any significant cytotoxicity in LLC PK1 epithelial cells. Further the presence of phenolic content and the resultant reducing property not only render antioxidant property but also makes it good antimicrobial agent.