Mohammed Essa
@applied.uofallujah.edu.iq
Vice Dean of the College of Applied Science
University of Fallujah.
EDUCATION
PhD. Laser & Molecular
Renewable Energy / University of Baghdad / College of
Science/ 2017
RESEARCH, TEACHING, or OTHER INTERESTS
Renewable Energy, Sustainability and the Environment, Electronic, Optical and Magnetic Materials, Computer Science Applications, Instrumentation
Scopus Publications
Scholar Citations
Scholar h-index
Scholar i10-index
Scopus Publications
Ahmed B. Taha, Mohammed Shaalan Essa, and Bahaa Toama Chiad
AIP Publishing
Ahmed B. Taha, Mohammed Sh. Essa, and Bahaa T. Chiad
AIP Publishing
Mushtaq Talib Al-Helaly, Bahaa T. Chiad, Nathera A. Al-Tememee, and Mohammed Sh. Essa
AIP Publishing
Ahmed Basim Taha, Mohammed Shaalan Essa, and Bahaa Toama Chiad
Trans Tech Publications, Ltd.
In this research, a homemade autoclave reactor was used for preparing iron oxide nanoparticles by hydrothermal technique at different reaction times by using ferric chloride, ferrous sulfate, and ammonium hydroxide as raw materials. The XRD characterization showed that the nanoparticles of the samples have high crystallinity with the crystal phase of magnetite, furthermore, the crystal phase of hematite appears clearly as the reaction time increased. The SEM results showed when the time of reaction increased the average particle size increased too from 28.1 to 49.2 nm. That means the reaction time is an effective parameter for the nanoparticle's growth, The EDX spectrum verified the confirmation of iron oxide nanoparticles by the appearance of Iron and Oxygen peaks. The FT-IR results showed that all samples have an absorption peak at about 578 cm-1 corresponding to the Fe-O bond stretching modes of the in magnetite and the peak of hematite appeared as the reaction time increased above 2 hours which was confirmed with XRD results. Finally, the reaction time is a powerful tool for controlling in size and phase of nanoparticle preparation. Keywords: Hydrothermal, Iron Oxide, Reaction time, magnetite, and hematite.
Bahaa T. Chiad, Mushtaq T. Al-Helaly, Mohammed Sh. Essa, and Nathera A. Al-Tememee
Journal of Physics: Conference Series IOP Publishing
The existing investigation explains the consequence of irradiation of red laser on the optic properties of (CoO2) films. The film was equipped by the utilization of semi-computerized spray pyrolysis technique (SCSPT), it is the first time that this technique is used in the preparation and irradiation using a laser in this technique. From the XRD analysis, the crystalline existence with trigonal crystal system was when the received films were processed by continuous red laser (700 nm) with power (>1000mW)for different laser irradiation time using different number of times a laser scan (0, 6, 9, 12, 15 and 18 times) with total irradiation time(0,30,45,60,75,90 min) respectively at room temperature. The optic properties of CoO2 thin samples was struck by light of red laser. The parameters such as the absorbance, coefficient of absorption coefficient of extinction refractive index, optic conductivity, the realϵ_1 and imaginaryϵ_2part of the dielectric constant of the films rises subsequently by laser irradiation, only the transmittance was decremented with laser ray of light. The optic energy gap was reduced from (1.91eV) without irradiation to (1.57eV) and subsequent laser irradiation, and there is a great alteration of optical energy gap values for photovoltaic (PV) utilization. As the results showed that the laser irradiation method has a clear change in the optical properties with less time and energy than the traditional annealing methods, this is the aim of the study.
Omar Shakir Shafeq, Bahaa Fakhry Shehab, Mohammed Sh. Essa, and Baha T. Chiad
IOP Conference Series: Materials Science and Engineering IOP Publishing
Mohammed Sh. Essa, Bahaa T. Chiad, and Zaid L. Hadi
IOP Publishing
Abstract Spray pyrolysis technique was employed for depositing Nickel oxide thin films onto glass substrates at 350±10 °C. An aqueous solution of NiCl2.4[H2O] within 0.01 M used for spraying. XRD examination revealed polycrystalline cubic phase of NiO thin films. The crystallinity growth along (111), (200), and (202) planes at 2θ = 37.28°, 43.29°, and 62.91°, respectively. AFM was examined and showed low roughness in the selected area. Thickness was calculated using Fizeau Fringes interferometric method that found around 175 nm. FTIR investigation endorses the vibration mode of the Ni-O bond. The absorption investigation was carried out in the range 350-750 nm, and the energy band gap was found to be about 3.68 eV. The microscopic imaging showed an adequate surface morphology with fine distribution of coating on the substrate.
Zaid L. Hadi, Mohammed Sh. Essa, and Bahaa T. Chiad
IOP Publishing
Abstract A fully computerized system of spray pyrolysis was employed for fabricating copper tin sulphite ternary thin film onto glass substrates. During deposition process, the glass substrate was maintained at 310 ± 10 °C. After dissolving the raw chemicals, a mixture of their aqueous solutions was used for spraying process. The optimum solution mixture at the volumetric ratio [S/(Cu+Sn)=1] at 1.5 of pH. XRD investigation was approved a monoclinic phase of CTS. A number of different platform speed was tested in the deposition process. XRD diffraction peaks were described at 2θ = 28.39°, 33.02°, 47.34°, and 56.39° corresponding to the ( 2 ¯ 1 ¯ 1 ) ( 2 ¯ 0 6 ) , ( 2 ¯ 0 10 ) , and ( 3 ¯ 2 ¯ 10 ) , respectively. These are crystal planes of monoclinic copper tin sulphide. The FTIR study certified a number of the chemical bond of Cu-, Sn- and S-. The grain size was observed in the range of nano using Scherrer formula. Studying surface morphology of CTS films reveals a uniform coating on the substrates which approved by SEM investigations.
Ahmed A Anber, Mohammed Sh Essa, Ghada A Kadhim, and Shaymaa S Hashim
IOP Publishing
In this work, nanoparticles copper oxide were prepared by using an atmospheric-pressure plasma jet in NaCl–NaOH–NaNO3 electrolytic system. Atmospheric-Pressure Plasma Jet was employed as the electrode (Cathode) while the anode was made of the copper strip. The formation and structure of the samples have been characterized via Fourier-transformation infrared (FTIR), X-ray diffraction patterns (XRD) and optical microscope. From the outcomes, the morphology was showed copper oxide nanocrystals by this technique is rely on the media of electrolytic and preparation time. It was cleared from (XRD), the addition of CuCl2 with the compositions was led to increase appearance of copper oxide. The uniformity of copper oxide nanoparticles with the average grain size about 70,104 nm. These results encourage preparing these nanostructures for using in industrial applications.
Mohammed Sh. Essa, Bahaa T. Chiad, and Khalil A. Hussein
IOP Publishing
Chemical thermal deposition techniques are highly depending on deposition platform temperature as well as surface substrate temperatures, so in this research thermal distribution and heat transfer was calculated to optimize the deposition platform temperature distribution, determine the power required for the heating element, to improve thermal homogeneity. Furthermore, calculate the dissipated thermal power from the deposition platform. Moreover, the thermal imager (thermal camera) was used to estimate the thermal destitution in addition to, the temperature allocation over 400cm2 heated plate area. In order to reach a plate temperature at 500 oC, a plate supported with an electrical heater of power (2000 W). Stainless steel plate of 12mm thickness was used as a heated plate and deposition platform and subjected to lab tests using element analyzer X-ray fluorescence system (XRF) to check its elemental composition and found the grade of stainless steel and found to be 316 L. The total heat losses calculated at this temperature was 612 W. Homemade heating element was used to heat the plate and can reach 450 oC with less than 15 min as recorded from the system.as well as the temperatures recorded and monitored using Arduino/UNO microcontroller with cold-junction-compensated K-thermocouple-to-digital converter type MAX6675.
Mays K. Ali, M. Essa and B. T. Chiad
University of Baghdad College of Science
In this study, the number of times of heating of olive oil was studied. For the different refineries, the study was conducted using a temperature of 300K and for several times to determine the validity of the olive oil which is used for frying purposes after it was used for more than once times. It was found that there were significant changes in the behavior of the photophysical behavior like absorption and emission; there are changes in the nature and composition of the olive oil molecule, which makes it not useful for human use. The number of heating times was ten. The heating times also showed significant changes in the nature of the oil, such as color, taste, density, and smell.
Ahmed Abed Anber, Mohammed Shalan Essa, Ghada Ayad Kadhim, Ali Jabar Fraih, Adil A. Anber, Farqad F. Edin, and Ammar S. Hameed
American Scientific Publishers
Mohammed Sh. Essa, Bahaa T. Chiad, and Omer Sh. Shafeeq
Author(s)
Thin Films of Copper Oxide (CuO) absorption layer have been deposited using home-made Fully Computerized Spray Pyrolysis Deposition system FCSPD on glass substrates, at the nozzle to substrate distance equal to 20,35 cm, and computerized spray mode (continues spray, macro-control spray). The substrate temperature has been kept at 450 °c with the optional user can enter temperature tolerance values ± 5 °C. Also that fixed molar concentration of 0.1 M, and 2D platform speed or deposition platform speed of 4mm/s. more than 1000 instruction program code, and specific design of graphical user interface GUI to fully control the deposition process and real-time monitoring and controlling the deposition temperature at every 200 ms. The changing in the temperature has been recorded during deposition processes, in addition to all deposition parameters. The films have been characterized to evaluate the thermal distribution over the X, Y movable hot plate, the structure and optical energy gap, thermal and temperature...
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