Shaista Ali
Government College University, Lahore, Chemistry, Faculty Member
- Lecturer at GC University Lahore, Pakistanedit
Research Interests:
In the current study, XRD peak profile analysis, optical and catalytic properties of pure ZnO–NiO and CdS doped ZnO-NiO nanocomposites were investigated. Average crystallite size, strain, dislocation density and bond length were... more
In the current study, XRD peak profile analysis, optical and catalytic properties of pure ZnO–NiO and CdS doped ZnO-NiO nanocomposites were investigated. Average crystallite size, strain, dislocation density and bond length were determined with X-ray peak profile analysis. Optical properties such as band gap, extinction coefficient, refractive index, optical conductivity, and dielectric constants were studied by solid phase spectroscopy (SPS). The blue shift was observed in ZnO–NiO as compare to bulk ZnO due to the quantum confinement while red shift was found in CdS/ZnO–NiO nanocomposites as compare to ZnO–NiO nanocomposites is due to bulk defects inducing delocalization and pressure induced effect. The optical conductivity of ZnO–NiO nanocomposites was observed increased with doping of CdS on ZnO–NiO from 4.57 × 1018 to 6.71 × 1018 S–1, respectively. It was observed that catalytic efficiency depends on the particle size and band gap of the nanocomposites.
Research Interests:
—Lanthanum Oxide (La 2 O 3) nanoparticles were synthesized by precipitation method using alkylbenzyl dimethyl ammonium chloride (Benzalkonium chloride) surfactant. The critical micelle concentration (CMC) value of the surfactant was... more
—Lanthanum Oxide (La 2 O 3) nanoparticles were synthesized by precipitation method using alkylbenzyl dimethyl ammonium chloride (Benzalkonium chloride) surfactant. The critical micelle concentration (CMC) value of the surfactant was determined using conductance and surface tension methods. The nanoparticles were characterized using Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), scanning electron microscopy (SEM), energy dispersive X-ray (EDX) and X-ray diffraction (XRD) analysis. Crystallite size and geometry of La 2 O 3 nanoparticles, established through XRD, are 40 nm and hexagonal, respectively. The optical property was calculated using solid phase UV-visible absorption spectrophotometer with band gap of 4.2 eV. Photocatalytic effi ciency of La 2 O 3 nanoparticles was studied against bromophenolblue (organic pollutant) with and without UV radiations. Percentage degradation and fi rst order rate constant values were determined as 24.7% and 0.0942 min –1 without irradiation and that they were 50.4 % and 0.0941 min-1 with irradiation, respectively.
Research Interests:
Fingermarks are one of the most useful forms of evidence in identification and can provide generalized proof of identity in crime investigation. They are developed using various conventional powders. The novel nanopowder ZnO-SiO2 was... more
Fingermarks are one of the most useful forms of evidence in identification and can provide generalized proof of identity in
crime investigation. They are developed using various conventional powders. The novel nanopowder ZnO-SiO2 was synthesized via the conventional heating method and characterized by Fourier transform infrared spectroscopy (FTIR), scanning electron microscope (SEM), energydispersive
X-ray (EDX) analysis, transmission electron microscope (TEM), and X-ray diffraction (XRD). The mean particle size of ZnO-SiO2
nanopowder calculated through TEM was 32.9 nm. The development of fingermarks was carried out by powder dusting and small particle reagent (SPR) methods. Powder dusting method was used for the development of latent fingermarks on various dry, nonporous, and semi-porous surfaces. The SPR method was also applied to wet nonporous surface. The developed latent fingermarks using ZnO-SiO2 nanopowder were found to have excellent quality with very clear third-level ridges detail and had better visibility than commercially available white powder.
crime investigation. They are developed using various conventional powders. The novel nanopowder ZnO-SiO2 was synthesized via the conventional heating method and characterized by Fourier transform infrared spectroscopy (FTIR), scanning electron microscope (SEM), energydispersive
X-ray (EDX) analysis, transmission electron microscope (TEM), and X-ray diffraction (XRD). The mean particle size of ZnO-SiO2
nanopowder calculated through TEM was 32.9 nm. The development of fingermarks was carried out by powder dusting and small particle reagent (SPR) methods. Powder dusting method was used for the development of latent fingermarks on various dry, nonporous, and semi-porous surfaces. The SPR method was also applied to wet nonporous surface. The developed latent fingermarks using ZnO-SiO2 nanopowder were found to have excellent quality with very clear third-level ridges detail and had better visibility than commercially available white powder.
Research Interests:
In vitro study to evaluate toxic effects of metal oxides nanoparticles on energy producing cycle was conducted. In this study oxidation of sodium succinate in aqueous solution was investigated by using potassium ferricyanide as an... more
In vitro study to evaluate toxic effects of metal oxides nanoparticles on energy producing cycle was conducted.
In this study oxidation of sodium succinate in aqueous solution was investigated by using potassium ferricyanide as an oxidizing agent. Kinetic measurements were carried out on kinetic mode of spectrophotometer at max 420 nm. Effect of different metal oxides (MgO and CaO) nanoparticles was observed on the oxidation of succinate at 25 ± 0.5 °C. These metal oxides nanoparticles were prepared by hydrothermal
method and their characterization were done by using FTIR, TGA, SEM-EDX, TEM and XRD. Kinetic results indicated that these nanoparticles inhibit the conversion of succinate into fumerate. The inhibition is directly dependent on particle size of the nanoparticles and it was observed that particle
size is inversely related to the oxidation rate of succinate. It was concluded at the end that elevated concentrations
of metal oxides nanoparticles can severely affect the Krebs cycle by inhibiting succinate oxidation and lead to various metabolic disorders.
In this study oxidation of sodium succinate in aqueous solution was investigated by using potassium ferricyanide as an oxidizing agent. Kinetic measurements were carried out on kinetic mode of spectrophotometer at max 420 nm. Effect of different metal oxides (MgO and CaO) nanoparticles was observed on the oxidation of succinate at 25 ± 0.5 °C. These metal oxides nanoparticles were prepared by hydrothermal
method and their characterization were done by using FTIR, TGA, SEM-EDX, TEM and XRD. Kinetic results indicated that these nanoparticles inhibit the conversion of succinate into fumerate. The inhibition is directly dependent on particle size of the nanoparticles and it was observed that particle
size is inversely related to the oxidation rate of succinate. It was concluded at the end that elevated concentrations
of metal oxides nanoparticles can severely affect the Krebs cycle by inhibiting succinate oxidation and lead to various metabolic disorders.
Research Interests:
Synthesis of Magnesium oxide (MgO) nanoparticles and zinc deposited magnesium oxide (Zn/MgO) nanoparticles was carried out using hydrothermal and deposition-precipitation method with the variation of 1-Propanol (organic solvent)... more
Synthesis of Magnesium oxide (MgO) nanoparticles and zinc deposited magnesium oxide (Zn/MgO) nanoparticles
was carried out using hydrothermal and deposition-precipitation method with the variation of 1-Propanol (organic
solvent) concentration, sodium hydroxide and urea concentration. The nanoparticles were characterized by using
FTIR, TGA, SEM-EDX, TEM and XRD. The photocatalytic efficiency of MgO and Zn/MgO nanoparticles was studied
by degradation of 2,4,6-trinitrophenol (TNP), which is highly acute and toxic and causes skin and eyes diseases, liver
malfunction and tumor formation. Photodegradation of TNP was carried out under UV irradiation and confirmed by
using HPLC and GC-MS. MgO and Zn/MgO nanoparticles that were synthesized by using urea showed higher firstorder
rate constant (k) value and percentage degradation as compared to nanoparticles that were synthesized using NaOH.
It was observed that the concentration of solvent has direct relation with the k value of degradation of TNP
was carried out using hydrothermal and deposition-precipitation method with the variation of 1-Propanol (organic
solvent) concentration, sodium hydroxide and urea concentration. The nanoparticles were characterized by using
FTIR, TGA, SEM-EDX, TEM and XRD. The photocatalytic efficiency of MgO and Zn/MgO nanoparticles was studied
by degradation of 2,4,6-trinitrophenol (TNP), which is highly acute and toxic and causes skin and eyes diseases, liver
malfunction and tumor formation. Photodegradation of TNP was carried out under UV irradiation and confirmed by
using HPLC and GC-MS. MgO and Zn/MgO nanoparticles that were synthesized by using urea showed higher firstorder
rate constant (k) value and percentage degradation as compared to nanoparticles that were synthesized using NaOH.
It was observed that the concentration of solvent has direct relation with the k value of degradation of TNP