Amel Merzah - Academia.edu (original) (raw)

Papers by Amel Merzah

Journal of Chemical and Petroleum Engineering, 2015

This article includes the preparation of luminescence materials from rare earth (Eu) ion doping Y... more This article includes the preparation of luminescence materials from rare earth (Eu) ion doping Yttrium Oxide (Y 2 O 3) 70% and SiO 2 25% and study the characteristics of phosphors for ultraviolet to visible conversion. The phosphor materials have been synthesized by two steps: Preparing the powder by solid state method using Y 2 O 3 , SiO 2 and Eu 2 O 3 with doping materials concentration (70%, 25% and 5%) respectively and different calcination temperature (1000, 1200 and 1400 o C). The second step is to prepare the colloid solution by dispersing the produced powder in a polyvinyl alcohol solution (4%). Powder preparation is achieved by mixing the powder according to weight percentage, milling by a ball mill using yttrium stabilized zirconia with the aid of propanol for homogenization then calcination the mixture at the above temperatures. The produced powder was characterized by X-Ray diffraction. Colloid preparation is achieved by dissolving the PVA in water (4%) then dispersing the powder into the solution by using the hot plate magnetic stirrer and ultrasonic bath. The produced powder was characterized by using Fourier transform infrared (FTIR) and Photoluminescence spectra (PL). The results of photoluminescence spectra show that samples were emitting red color with wave length of 612nm. The intensity of emission was increased with increasing calcination temperature.

Al-Khwarizmi Engineering Journal, 2014

The aim of the present work is to control of metal buried corrosion by alteration the depended on... more The aim of the present work is to control of metal buried corrosion by alteration the depended on the characteristics of each media. The corrosion rates in different media (soil, sand, porcelanite stone and gravel) for specimens of low carbon steel were measured by two methods weight loss method and polarization m weight loss measured by buried specimens in these medias separately for 90 days. The polarization method includes preparing of specimen and salt solutions have electrical resistivity equivalent electrical resistivity of these media. The corrosion rate of two method results in (soil > sand> porcelainte stone> gravel). The lower corrosion rate happened in gravel media because of characteristics of high electrical resistivity and lower porosity for gravel while the higher corrosion rate occurred in the soil.

Iraqi Journal of Chemical and Petroleum Engineering, 2015

This article includes the preparation of luminescence materials from rare earth (Eu ) ion doping ... more This article includes the preparation of luminescence materials from rare earth (Eu ) ion doping Yttrium Oxide (Y2O3) 70% and SiO2 25% and study the characteristics of phosphors for ultraviolet to visible conversion. The phosphor materials have been synthesized by two steps: Preparing the powder by solid state method using Y2O3, SiO2 and Eu2O3 with doping materials concentration (70%, 25% and 5%) respectively and different calcination temperature (1000, 1200 and 1400 oC). The second step is to prepare the colloid solution by dispersing the produced powder in a polyvinyl alcohol solution (4%) . Powder preparation is achieved by mixing the powder according to weight percentage, milling by a ball mill using yttrium stabilized zirconia with the aid of propanol for homogenization then calcination the mixture at the above temperatures. The produced powder was characterized by X-Ray diffraction. Colloid preparation is achieved by dissolving the PVA in water (...

Journal of Chemical and Petroleum Engineering, 2014

Membrane manufacturing system was operated using dry/wet phase inversion process. A sample of hol... more Membrane manufacturing system was operated using dry/wet phase inversion process. A sample of hollow fiber membrane was prepared using (17% wt PVC) polyvinyl chloride as membrane material and N, N Dimethylacetamide (DMAC) as solvent in the first run and the second run was made using (DMAC/Acetone) of ratio 3.4 w/w. Scanning electron microscope (SEM) was used to predict the structure and dimensions of hollow fiber membranes prepared. The ultrafiltration experiments were performed using soluble polymeric solute poly ethylene glycol (PEG) of molecular weight (20000 Dalton) 800 ppm solution 25 °C temperature and 1 bar pressure. The experimental results show that pure water permeation increased from 25.7 to 32.2 (L/m 2 .h.bar) by adding acetone to the dope solution, while rejection decreased from 91.8 to 63.2%.

$Research paper thumbnail of Improvement of Iraqi Red Kaolin as a Refractory Material$

Engineering and Technology Journal, 2014

In this work refractory material was prepared from Iraqi red kaolin with the addition of differen... more In this work refractory material was prepared from Iraqi red kaolin with the addition of different proportions of silica and alumina (10, 15, 20 %) for each one and the red kaolin 70%. The powders were mixed in a ball mill, sieved, formed, dried at 110 o C for 8 hrs and then fired at different temperatures 800, 900, 1000 and 1100 o C for 2 hrs. The physical properties(linear and volumetric shrinkage ,apparent density and porosity) were calculated from the measured data .It was found that the higher the firing temperature the better the properties of the prepared samples for a given mixture ,the best properties obtained in this work was 70%red kaolin,10%silica and 20%alumina).

Corrosioninduced damage in reinforced concrete structure such as bridges, parking garages, and bu... more Corrosioninduced damage in reinforced concrete structure such as bridges, parking garages, and buildings, and the related cost for maintaining them in a serviceable condition, is a source of major concern for the owners of these structures. Fly ash produced from south Baghdad power plant with different concentrations (20, 25 and 30) % by weight from the cement ratio were used as a corrosion inhibitor as a weight ratio from the cement content. The concrete batch ratio under study was (1:1.5:3) cement, sand and gravel respectively which is used in Iraq. All the raw materials used were locally manufactured. Concrete slabs (250x250x70) mm dimensions were casted, using Poly-wood molds. Two steel bars were embedded in the central position of each slab at the midheight (about 35 mm), with a space of 100 mm between each other. A 16 concrete slabs were prepared (0, 20, 25 and 30) wt. % of fly ash. The specimens were partially immersed in 3.5 wt. % NaCl solution in order to predict the corros...

$Research paper thumbnail of Iraqi Bauxite and Porcalinite Rocks Based Refractory, Preparation and Studying Properties$

Al-Khwarizmi Engineering Journal, 2017

Locally natural occurring Iraqi rocks of Bauxite and Porcelanite (after pre calcinations at 100... more Locally natural occurring Iraqi rocks of Bauxite and Porcelanite (after pre calcinations at 1000oC for 1hr) were used, with the addition of different proportions of MgO and Al2O3, to prepare refractory materials. The effects of these additives on the physical and thermal properties of the prepared refractories were investigated. Many batches of Bauxite/MgO, Bauxite/Al2O3, Bauxite/MgO/Al2O3, and Porcelanite/ MgO/Al2O3 were prepared. The mixture is milled and classified into different size fractions; fine (less than 45μm) 40%, middle (45-75μm) 40%, and coarse (75-106μm) 20% . X-ray diffraction technique was used to identify the structure of Bauxite and Porcelanite rocks. The samples were formed by semi dry pressing with the addition of few drops of water as a binder. These samples were sintered at 1100oC for 2hrs. Physical properties (linear shrinkage, density and porosity), and the thermal properties (thermal conductivity, diffusivity and specific heat) w...

Automation, Control and Intelligent Systems, 2015

The present work include preparation of phosphors materials from rare earth (Eu) ion doping Silic... more The present work include preparation of phosphors materials from rare earth (Eu) ion doping Silicon Oxide (SiO 2), and study the characteristics of phosphors for ultraviolet to visible conversion. The phosphor materials have been synthesized by two steps, the first was preparing the powder by solid state method usingSiO 2 , and Eu 2 O 3 with doping concentration of 5% and different calcination temperature (1000, 1200 and 1400 o C), the second step is the preparing of the colloid by dispersing the produced powder in a polyvinyl alcohol solution (4%). Powder preparation achieved by mixing the powder according to weight percentage, milling then calcinning the mixture at the above temperatures. The produced powder was characterized by X-Ray diffraction .The X-Ray resultsshow a mismatch with the standard peaks. The difference may be due to the variation in purity of the materials and the phases before calcination. Colloid preparation achieved by dissolving the PVA in water (4%) then dispersing the powder into the solution by using the hot plate magnetic stirrer and ultrasonic bath. The produced powder was characterized by using Fourier transform infrared (FTIR) and Photoluminescence spectra (PL). The results of photoluminescence spectra show that samples doped with Europium ions emit red color with wave length 612nm.The intensity of emission was increased with increasing calcination temperature.

Journal of Chemical and Petroleum Engineering, 2007

DESALINATION AND WATER TREATMENT, 2021

One of the major problems in the petrol industry is water contamination. This study deals with th... more One of the major problems in the petrol industry is water contamination. This study deals with the treatment of contaminated waters of the North Gas Company in Kirkuk province north of Iraq. There are many different processes and additive materials that can be used to treat contaminated water. In this study, different materials were added to give a coagulated layer that can help in the treatment of the contaminates in polluted water which then can be removed through filtration. The combined mixture of 80% porcelanite and 20% bentonite additives were applied as a coagulation agent in the present work. A comparison treatment performance was also made with aluminum sulfate. Milling and grinding to a fine powder using a ball mill was adopted to produce a homogeneous bed of porcelanite and bentonite as new flocculants, results revealed that higher treatment efficiencies can be obtained using the new flocculent. Removal efficiencies of 93%, 94%, 91%, and 85% were achieved respectively for...

IOP Conference Series: Materials Science and Engineering

The industrial and agricultural waste water contains many contaminants; one of them is the food c... more The industrial and agricultural waste water contains many contaminants; one of them is the food carmoisine dye E112, which causes a series problems for the environment. Adsorption using porous media is one of the solutions to this problem. In the present work, activated silica sand (ASS), activated carbon (AC), porcelanite, silt and composite porous media, were prepared and used to remove the E112 from waste water using adsorption technique. It was predicted that the removal efficiency was affected by many factors such as time, pH, dose and ozonation of media. These factors were studied and analyzed to investigate the best media which is the activated carbon with the highest removal efficiency than the other porous medias. The results showed that: • The best removal efficiency of carmoisine dye E-112 was by activated carbon (AC) that reaching to 76% under specific conditions (7 of pH, 20g of AC and 10 mg/l initial concentration of dye) which were selected after several attempts unti...

This study is designed to prepare and evaluate a new composite material composed of Porcelanite a... more This study is designed to prepare and evaluate a new composite material composed of Porcelanite and lithium metasilicate, mixing them in different weight percentages 20:80, , 25:75, 40:60, 50:50,and 75:25, respectively, in order to develop a new composite material by a solid state reaction method, with advanced properties for physical and mechanical which can be used for dental veneer applications. Results show that the percentage of Porcelanite strongly enhances these properties for the composite, until reaching the sample with (75% Porcelanite and 25% Lithium meta silicate), which is begun to reduce. The best weight percentage from the view of physical properties, cold crushing strength, and the micro hardness, will be the 50% Porcelanite, which is suggested it to be as a good dental material used in veneer applications.