V. Mote, B. Dole,
Volume 12, Issue 1 (march 2015 2015)
Abstract
Mn doped ZnO nanocrystals were prepared by co-precipitation route sintered at 450 °C temperature. XRD
results indicate that the samples having hexagonal (wurtzite) structure. From X-ray data it is found that the lattice
parameters increase with increasing Mn concentration. The X-ray density decreases with increasing Mn concentration
of Zn
1-x
Mnx
O nanocrystals. It indicates that the Mn ions go into the Zn site in the ZnO lattice structure. TEM results
reveal that the pure and Mn substituted ZnO samples are spherical in shape with average particle size about 20-60
nm. The crystalline size and lattice strain were evaluated by Williamson-Hall (W-H) analysis using X-ray peak
broadening
data. All other relevant physical parameters such as strain, stress and energy density were calculated by the different
models Viz, uniform deformation model (UDM), uniform deformation stress model (UDSM) and Uniform deformation
energy density model (UDEDM) considering the Williamson-Hall analysis. These models reveal different strain values
it may be due to the anisotropic nature of the material. It is found that the mean particle size of Zn
1-x
MnxO
nanoparticles was estimated from TEM analysis, Scherrer’s formula & W-H analysis is highly comparable
F. Salehtash, H. Banna Motejadded Emrooz, M. Jalaly,
Volume 15, Issue 2 (June 2018)
Abstract
Mesoporous SiO2 nanopowder was synthesized under an acidic condition by a sol-gel method using various amounts of cetyltrimethyl ammonium bromide (CTAB) as structure directing agent. The samples were investigated with XRD, SEM, FTIR, TEM and N2 absorption-desorption analysis. Also, the incremental effect of surfactant were examined. The results obtained from the analysis suggested that an increase in the amount of surfactant resulted in increasing specific surface area, pore size and pore volume, of the synthesized particles up to 549 m2.g-1, 17.3 nm, and 2 cm3.g-1, respectively. Absorption behavior of the mesoporous silica was investigated for degradation of methylene blue pigments (MB) in aqueous solutions. The samples SC0, SC0.5 and SC1 showed the maximum absorption capacities of 333, 454 and 526 mg/g, respectively
