ABSTRACT
A simple co-precipitation method has been used for the synthesis of Co(2+) and Ni(2+)-doped zinc borate nanopowders. X-ray diffraction (XRD), Fourier transform infrared (FT-IR), UV/Vis absorption, Scanning electron microscope (SEM) with EDS and photoluminescence (PL) spectroscopies techniques has been employed for their characterization. Powder X-ray diffraction data reveals that the crystal structure belongs to monoclinic for both as-prepared samples. SEM images showed surface morphology of the prepared samples. Optical absorption spectra showed the characteristic bands of doped ions in octahedral site symmetry. From the optical absorption data crystal field and inter-electronic repulsion parameters are evaluated. The FT-IR spectra showed the characteristic vibrational bands related to ZnO, BO3 and BO4 molecules. Photoluminescence spectra exhibited the emission bands in ultraviolet and blue regions.
Subject(s)
Borates/chemistry , Cobalt/chemistry , Nanoparticles/chemistry , Nickel/chemistry , Zinc/chemistry , Cations, Divalent/chemistry , Luminescence , Luminescent Measurements , Nanoparticles/ultrastructure , Powders , Spectrophotometry, Ultraviolet , Spectroscopy, Fourier Transform Infrared , X-Ray DiffractionABSTRACT
Crude enzyme extract obtained from the petioles of the plant piper betel- Bengal variety as been evaluated for various physico-chemical studs such as estimation of protein content, thin layer chromatography, optical activity and tests for the presence of thiol groups, disulphide and peptide linkages and the results are discussed.
ABSTRACT
Brachylepis nervosa, Wight and Arnot, belongs to the family asclepiadaceae is indigenous to ills of the Nilgiris and distribution of which is restricted to Wellington and kothagiri. The present work summarises preliminary phytochemical characters of this plant.
