Papers by Nadia A Abdulrahman
Iraqi journal of science, Jul 30, 2023
With and without the use of magnetic fields, titanium dioxide (TiO2) nanoparticles were synthesiz... more With and without the use of magnetic fields, titanium dioxide (TiO2) nanoparticles were synthesized using the hydrothermal method at extremely high temperatures and pressures. Titanium tetra isopropoxide [Ti(C12H28O4)] was used for the preparation, which was performed at pH 7 and under temperatures of 160 and 190 ˚C. UV spectroscopy, XRD crystallography, FE-SEM microscopy were used for characterizations. From UV spectroscopy, the energy gap values were clearly affected by the increase in temperature and the presence of the magnetic field. At the temperatures of 160 and 190 o C for TiO2 without magnetic field, FE-SEM microscopy images have shown an average crystal diameter of 13.436 and 12.551 nm, respectively. While for TiO2 with the presence of magnetic field, the crystal diameters were found to be 14.665 and 14.468 nanometers, respectively, at same temperatures. Additionally, XRD analysis has revealed that the average crystal size of TiO2 at 160 and 190 ˚C without a magnetic field is 13.13 and 11.59 nanometers, respectively. While the crystal sizes for TiO2 in the presence of a magnetic field were determined to be 13.19 and 12.93 nanometers, respectively.
Iraqi Journal of Science
With and without the use of magnetic fields, titanium dioxide (TiO2) nanoparticles were synt... more With and without the use of magnetic fields, titanium dioxide (TiO2) nanoparticles were synthesized using the hydrothermal method at extremely high temperatures and pressures. Titanium tetra isopropoxide [Ti(C12H28O4)] was used for the preparation, which was performed at pH 7 and under temperatures of 160 and 190 ˚C. UV spectroscopy, XRD crystallography, FE-SEM microscopy were used for characterizations. From UV spectroscopy, the energy gap values were clearly affected by the increase in temperature and the presence of the magnetic field. At the temperatures of 160 and 190 oC for TiO2 without magnetic field, FE-SEM microscopy images have shown an average crystal diameter of 13.436 and 12.551 nm, respectively. While for TiO2 with the presence of magnetic field, the crystal diameters were found to be 14.665 and 14.468 nanometers, respectively, at same temperatures. Additionally, XRD analysis has revealed that the average crystal size of TiO2 at 160 and 190 ˚C without a magnetic f...
Archives in Chemistry, 2020
This work presents temperatureimpact on ZnO nanostructures growth when synthesized via solvo-ther... more This work presents temperatureimpact on ZnO nanostructures growth when synthesized via solvo-thermal technique. For a temperature range of:70, 100, 130 and 160 oC, and precursors of Zinc acetate dihydrate and sodium hydroxide (both dissolved in methanol)we noticed an obvious temperature impact on the grain size and hence an obvious variation on the corresponding band gap energy. Having the fact that ZnO is a semiconductor; variation of ZnO nanostructures band gap energy means variation of quantum confinement effect; which is considered to be an essential parameter to tune semiconductors optical and electrical properties. This work also presents solvent impact on ZnO nanostructures growth when synthesized via hydro-solvo-thermal technique at temperatures of 70 oC and 150oC, and precursors of Zinc acetate dihydrate and sodium hydroxide; both dissolved in H2O:Methanole solution mixtures of: 1:3,2:2, 3:1 and 1:3. Again, we noticed an obvious solvent impact on ZnO nanostructures shapes a...
We tried to overcome some industrial defects of crystals (Cu doped ZnO) while improving some of i... more We tried to overcome some industrial defects of crystals (Cu doped ZnO) while improving some of its features through the use of three important factors: Doping (5% Cu), temperature, and magnetic field effect. We have identified some of its properties and dimensions through UV, XRD and FE-SEM measurements. We have succeeded in preparing Cu doped ZnO Nanostructure with different lengths and diameters, more uniform crystals, as well as multiple energy gap values. This allows it to be used in a wide range of technology applications. Energy gap values are clearly affected by the increase in temperature and the presence of the magnetic field. The size of the crystals increases with the increase in temperature and the presence of the magnetic field. The crystals become more uniform and the artificial defects decrease. The change in the dimensions of the crystals with increasing temperature depends on the nature of doping and the nature of semiconductor metallurgy. Lengths and diameters of ...
Research Journal of Pharmacy and Technology, 2020
Helicobacter pylori are implicated in the pathogenesis of several human gastric diseases and lead... more Helicobacter pylori are implicated in the pathogenesis of several human gastric diseases and lead to significant morbidity and mortality worldwide. This study aimed to estimate serum levels of vitamin B12 in Iraqi individuals infected with H. pylori and comparing them with healthy individuals. This case-control study was performed between January and June 2019 on eighty-four participants (41 female and 43 male) distributed evenly into patients and control groups. Serum vitamin B12 was measured and complete blood count was performed. The results revealed that patients group had decreased levels of hemoglobin, hematocrit, mean corpuscular volume, mean corpuscular hemoglobin, and mean corpuscular hemoglobin concentration, red blood cell, white blood cells and platelet compared to healthy individuals. Moreover vitamin B12 level of patients (females and males) was significantly lower than that of control group (396.2±101.3 vs. 706±269pg/ml) for females and (253±100 vs. 629±151 pg/ml) for males. Vitamin B12 might be used as a valuable indicator for anemic patients having gastritis since it is strongly correlated to Hb, HCT, MCV, MCH, MCHC and PLT level in infected patients.
Iraqi journal of science, 2021
5wt% copper doped zinc oxide (Cu-ZnO) nanostructures were prepared via the hydrothermal technique... more 5wt% copper doped zinc oxide (Cu-ZnO) nanostructures were prepared via the hydrothermal technique at different temperatures of 70, 100, 130, 160 and 190oC. UV spectroscopy, FE-SEM microscopy, XRD crystallography, and EDS measurements were used for nanostructure characterization. UV spectroscopy indicated a red shift for the absorption peaks, and hence a blue shift for the energy gap values, as temperature increased from 70 to 190oC. FE-SEM microscopy showed an increase in the average lengths and diameters of the nanostructures following a similar increase in temperature. XRD crystallography indicated decent structural patterns for Cu-ZnO nanostructures with an increase in crystallite size upon temperature increase. Interestingly, three unprecedented extra indices appeared in the structural pattern at 190oC, which might indicate a configuration of hexagonal crystallite with three extra planes. EDS measurements indicated the sole presence of Cu, Zn and O.
Solid State Technology, 2020
We were prepared 5wt% Cobalt doped zinc oxide (Co-ZnO) nano crystals via hydrothermal technique ... more We were prepared 5wt% Cobalt doped zinc oxide (Co-ZnO) nano crystals via hydrothermal technique at different temperatures of 70, 100, 130, 160 and 190oC. UV spectroscopy, XRD crystallography, EDS measurements, FE-SEM microscopy were used for characterizations and TEM microscopy. UV spectroscopy has shown absorbance peaks at: 370, 375, 377, 378 and 380 nm, and accordingly, values of energy gaps of: 3.35324, 3.30853, 3.29098, 3.28174, and 3.26447 eV; this is at the range of temperatures of: 70, 100, 130, 160 and 190oC, respectively. XRD crystallography has shown intense diffraction angles for the indices of: 100, 002, 101, 102, 112, 110, 103, 200, 112, 201, 311, 004 and 202 at a range of diffraction angles between10 to 80 degree. We experiential two extra indices at the diffraction angles of 44.56 o and 72.44o which have not been mentioned formerly by others, and we suppose this might indicates the formation of hexagonal crystallites with two extra planes. We measurements ...
NeuroQuantology, 2020
This work presents crystallites characterization via XRD spectroscopy for ZnO nanoparticles previ... more This work presents crystallites characterization via XRD spectroscopy for ZnO nanoparticles previously prepared via hydrothermal technique at four different temperatures of 70, 100, 130 and 160 oC. As an industrial semiconductor, crystallite characterization is essential to rationally tune ZnO optical, mechanical, electrical and chemical properties. Braggs angles were used to estimate the internal distances, lattice constants and unit cell volumes. Scherre equation was used to estimate crystallites sizes and the number of unit cells inside a single crystallite. Williamson Hall analysis was used to estimate crystallites strain, crystallites stress and crystallites energy density. And finally, SSP analysis was used to estimate the relation between crystallites sizes and crystallites strain. In general, XRD spectroscopy has indicated an average crystallite size of 40 nm with a short elongated hexagonal unit cell which agglomerated as wurtzite like shapes. SEM images have indicated a gradual growth for ZnO nanoparticles starting at > 40 to end up at > 500 nm as temperatures increased from 70 to 160 oC.
Work in this thesis involves manipulating the interaction between light and matter in order to re... more Work in this thesis involves manipulating the interaction between light and matter in order to retrieve important information from adsorbed molecules, such as their structure and/or function, and henceforth, to gain insight into highly sensitive detection capabilities for biosensor applications. Such III Contents
Nano Letters, 2012
We report a new approach for creating chiral plasmonic nanomaterials. A previously unconsidered, ... more We report a new approach for creating chiral plasmonic nanomaterials. A previously unconsidered, far-field mechanism is utilized which enables chirality to be conveyed from a surrounding chiral molecular material to a plasmonic resonance of an achiral metallic nanostructure. Our observations break a currently held preconception that optical properties of plasmonic particles can most effectively be manipulated by molecular materials through near-field effects. We show that far-field electromagnetic coupling between a localized plasmon of a nonchiral nanostructure and a surrounding chiral molecular layer can induce plasmonic chirality much more effectively (by a factor of 10 3) than previously reported near-field phenomena. We gain insight into the mechanism by comparing our experimental results to a simple electromagnetic model which incorporates a plasmonic object coupled with a chiral molecular medium. Our work offers a new direction for the creation of hybrid molecular plasmonic nanomaterials that display significant chiroptical properties in the visible spectral region.
Nanoscale, 2013
We demonstrate that engineered artificial gold chiral nanostructures display significant levels o... more We demonstrate that engineered artificial gold chiral nanostructures display significant levels of non-linear optical activity even without plasmonic enhancement. Our work suggests that although plasmonic excitation enhances the intensity of second harmonic emission it is not a prerequisite for significant non-linear (second harmonic) optical activity. It is also shown that the non-linear optical activities of both the chiral nanostructures and simple chiral molecules on surfaces have a common origin, namely pure electric dipole excitation. This is a surprising observation given the significant difference in length scales, three orders of magnitude, between the nanostructures and simple chiral molecules. Intuitively, given that the dimensions of the nanostructures are comparable to the wavelength of visible light, one would expect non-localised higher multipole excitation (e.g. electric quadrupole and magnetic dipole) to make the dominant contribution to non-linear optical activity. This study provides experimental evidence that the electric dipole origin of non-linear optical activity is a generic phenomenon which is not limited to sub-wavelength molecules and assemblies. Our work suggests that viewing nonplasmonic nanostructures as "meta-molecules" could be useful for rationally designing substrates for optimal non-linear optical activity.
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Papers by Nadia A Abdulrahman