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Papers by Aboubakr Abdullah
Chemistry of Materials, 2016
Chemical Engineering Research and Design, 2016
Research Perspectives on Functional Micro- and Nanoscale Coatings, 2000
Materials Science and Engineering: A, 2016
Qatar Foundation Annual Research Conference, Nov 13, 2014
Nanomedicine (London, England), Jan 8, 2016
Wound dressings play an important role in a patient's recovery from health problems, as unatt... more Wound dressings play an important role in a patient's recovery from health problems, as unattended wounds could lead to serious complications such as infections or, ultimately, even death. Therefore, wound dressings since ancient times have been continuously developed, starting from simple dressings from natural materials for covering wounds to modern dressings with functionalized materials to aid in the wound healing process and enhance tissue repair. However, understanding the nature of a wound and the subsequent healing process is vital information upon which dressings can be tailored to ensure a patient's recovery. To date, much progress has been made through the use of nanomedicine in wound healing due to the ability of such materials to mimic the natural dimensions of tissue. This review provides an overview of recent studies on the physiology of wound healing and various wound dressing materials made of nanofibers fabricated using the electrospinning technique.
Surface and Coatings Technology, 2015
In spite of the excellent resistance of stainless steel (SS) towards uniform corrosion, overcomin... more In spite of the excellent resistance of stainless steel (SS) towards uniform corrosion, overcoming various localized corrosion could be a real challenge. This work presents an analysis of the failure behavior of 316L SS air chiller tube with a peripheral crack used in a Qatari gas company in Qatar. Macroscopic failure characteristics were analyzed by means of visual inspection, digital imaging while light microscopy, electron microscopy (SEM / EDX), and X-ray fluorescence (XRF) were employed for microstructural and fractographic characterization. The results indicate that the failure phenomenon that was primarily initiated by Cl-led to an eventual autocatalytic pitting corrosion. The failure reasons of the tube are related to the combined effect of constant and cyclic external stresses, as well as internal residual stress originated from various operating conditions.
Journal of the American Chemical Society, Jan 17, 2015
Core-shell magnetic mesoporous silica microspheres (Magn-MSMs) with tunable large mesopores in th... more Core-shell magnetic mesoporous silica microspheres (Magn-MSMs) with tunable large mesopores in the shell are highly desired in biocatalysis, magnetic bio-separation and enrichment. In this study, a shearing assisted interface co-assembly in n-hexane/water bi-liquid systems is developed to synthesize uniform Magn-MSMs with magnetic core and mesoporous silica shell for an efficient size-selective biocatalysis. The synthesis features the rational control over the electrostatic interaction among cationic surfactant molecules, silicate oligomers and Fe3O4@RF microspheres (RF: resorcinol formaldehyde) in the presence of shearing-regulated solubilization of n-hexane in surfactant micelles. Through this multicomponent interface co-assembly, surfactant-silica mesostructured composite has been uniformly deposited on the Fe3O4@RF microspheres, and core-shell Magn-MSMs are obtained after removing the surfactant and n-hexane. The obtained Magn-MSMs possess excellent water dispersibility, uniform...
Qatar Foundation Annual Research Forum Proceedings, 2013
Applied Surface Science, 2017
Microporous and Mesoporous Materials, 2016
International Journal of Electrochemical Science, Apr 1, 2012
Cobalt and nickel oxides-graphene nanocomposites have been prepared by a simple chemical route. T... more Cobalt and nickel oxides-graphene nanocomposites have been prepared by a simple chemical route. The structure, morphology and properties were characterized using X-ray diffraction (XRD) and Transmission Electron Microscope (TEM). The electrocatalytic activity for the methanol oxidation reaction in acidic medium of these nanocomposites compared to platinum has been confirmed using cyclic voltammetry technique.
Meeting Abstracts, Feb 15, 2012
Two main theories were proposed to explain crevice corrosion for metals and alloys; the pH-chlori... more Two main theories were proposed to explain crevice corrosion for metals and alloys; the pH-chloride theory , which mainly discusses solution composition changes within the crevice and the IR voltage drop theory , which attributes crevice corrosion to both the potential and composition changes within the crevice.
This thesis is classified into four chapters. While chapter 1 is only an introductory chapter tha... more This thesis is classified into four chapters. While chapter 1 is only an introductory chapter that summarizes the two mechanisms that are trying to explain localized corrosion of metals and alloys, Chapter 4 is the conclusions and future work chapter that presents the new achievements that have been added to the field of corrosion science by this work besides the proposed work to be done in the future. Chapters 2 and 3 are the core of this thesis and each of them has its own abstract, objective, and literature review, experimental, results and discussion, conclusions, and references list. In chapter 2, Crevice corrosion of an experimental Al 6111-like alloy with 0.68% Cu has been studied using potentiodynamic and potentiostatic techniques in different concentrations of sodium chloride and in 0.1M nitric acid solutions. Potentiodynamic experiments show that the alloy has an active/passive transition in a saturated sodium chloride solution at elevated temperatures (90 and 70 o C). Also, a steep electrode potential gradient, E(x), within the crevice has been measured using a microprobe connected to a SCE and controlled by a 3-D manipulator, and the observed locations of corrosion on the crevice wall are similar to the locations seen previously for systems in which it was clear that the shift of E(x) into the active peak region of the polarization curve on the crevice wall stabilized the crevice corrosion process. The same active peak E(x) relationship was observed for the Al 6111-like alloy in 0.1 M nitric acid solutions at room temperature.
Porous nanocrystalline carbon and nitrogen (CN)-doped TiO 2 photocatalyst was prepared using carb... more Porous nanocrystalline carbon and nitrogen (CN)-doped TiO 2 photocatalyst was prepared using carbon tetrachloride and polyaniline as precursors. The obtained powders were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), Raman spectroscopy, Fourier transform infrared (FT-IR) spectroscopy, and gravimetric analysis. The purpose of this work was to explore the state and location of nitrogen and carbon atoms introduced inside the TiO 2 lattice and to study the exploitation of the photocatalytic activity of the CN-doped TiO 2 for application in phenol degradation under UV illumination. After 30 min from the illumination onset, 64% and 57% of the phenol were degraded when the CN-doped TiO 2 and TiO 2 catalysts were used respectively. ª 2015 The Authors. Production and hosting by Elsevier B.V. on behalf of King Saud University. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
Aluminum industry produces hundreds of tons of spent pot lining (SPL) waste every year. SPL is cl... more Aluminum industry produces hundreds of tons of spent pot lining (SPL) waste every year. SPL is classified into two types: 1 st cut and 2nd cut. The 1 st cut SPL which is the material under study in this work is mainly composed of graphite (~ 60%), ceramic material and Al metal (~ 10%). On contrary with the 2nd Cut SPL, there is a consensus that the 1 st cut SPL is a hazardous material and must be treated be-fore dumping it in a landfill. Recycling it will be more beneficial if possible. The aim of this study is reviewing of the anodes paste that are used in Aluminum reduction cell by studying their structure and physical properties and suggesting new methods for choosing a new binders that could be satisfied and improved the current anodes. Moreover, by comparing anodes paste with the new inert anodes technology which now under development and that could be used to observe the difference in their structures and properties.
Chemistry of Materials, 2016
Chemical Engineering Research and Design, 2016
Research Perspectives on Functional Micro- and Nanoscale Coatings, 2000
Materials Science and Engineering: A, 2016
Qatar Foundation Annual Research Conference, Nov 13, 2014
Nanomedicine (London, England), Jan 8, 2016
Wound dressings play an important role in a patient's recovery from health problems, as unatt... more Wound dressings play an important role in a patient's recovery from health problems, as unattended wounds could lead to serious complications such as infections or, ultimately, even death. Therefore, wound dressings since ancient times have been continuously developed, starting from simple dressings from natural materials for covering wounds to modern dressings with functionalized materials to aid in the wound healing process and enhance tissue repair. However, understanding the nature of a wound and the subsequent healing process is vital information upon which dressings can be tailored to ensure a patient's recovery. To date, much progress has been made through the use of nanomedicine in wound healing due to the ability of such materials to mimic the natural dimensions of tissue. This review provides an overview of recent studies on the physiology of wound healing and various wound dressing materials made of nanofibers fabricated using the electrospinning technique.
Surface and Coatings Technology, 2015
In spite of the excellent resistance of stainless steel (SS) towards uniform corrosion, overcomin... more In spite of the excellent resistance of stainless steel (SS) towards uniform corrosion, overcoming various localized corrosion could be a real challenge. This work presents an analysis of the failure behavior of 316L SS air chiller tube with a peripheral crack used in a Qatari gas company in Qatar. Macroscopic failure characteristics were analyzed by means of visual inspection, digital imaging while light microscopy, electron microscopy (SEM / EDX), and X-ray fluorescence (XRF) were employed for microstructural and fractographic characterization. The results indicate that the failure phenomenon that was primarily initiated by Cl-led to an eventual autocatalytic pitting corrosion. The failure reasons of the tube are related to the combined effect of constant and cyclic external stresses, as well as internal residual stress originated from various operating conditions.
Journal of the American Chemical Society, Jan 17, 2015
Core-shell magnetic mesoporous silica microspheres (Magn-MSMs) with tunable large mesopores in th... more Core-shell magnetic mesoporous silica microspheres (Magn-MSMs) with tunable large mesopores in the shell are highly desired in biocatalysis, magnetic bio-separation and enrichment. In this study, a shearing assisted interface co-assembly in n-hexane/water bi-liquid systems is developed to synthesize uniform Magn-MSMs with magnetic core and mesoporous silica shell for an efficient size-selective biocatalysis. The synthesis features the rational control over the electrostatic interaction among cationic surfactant molecules, silicate oligomers and Fe3O4@RF microspheres (RF: resorcinol formaldehyde) in the presence of shearing-regulated solubilization of n-hexane in surfactant micelles. Through this multicomponent interface co-assembly, surfactant-silica mesostructured composite has been uniformly deposited on the Fe3O4@RF microspheres, and core-shell Magn-MSMs are obtained after removing the surfactant and n-hexane. The obtained Magn-MSMs possess excellent water dispersibility, uniform...
Qatar Foundation Annual Research Forum Proceedings, 2013
Applied Surface Science, 2017
Microporous and Mesoporous Materials, 2016
International Journal of Electrochemical Science, Apr 1, 2012
Cobalt and nickel oxides-graphene nanocomposites have been prepared by a simple chemical route. T... more Cobalt and nickel oxides-graphene nanocomposites have been prepared by a simple chemical route. The structure, morphology and properties were characterized using X-ray diffraction (XRD) and Transmission Electron Microscope (TEM). The electrocatalytic activity for the methanol oxidation reaction in acidic medium of these nanocomposites compared to platinum has been confirmed using cyclic voltammetry technique.
Meeting Abstracts, Feb 15, 2012
Two main theories were proposed to explain crevice corrosion for metals and alloys; the pH-chlori... more Two main theories were proposed to explain crevice corrosion for metals and alloys; the pH-chloride theory , which mainly discusses solution composition changes within the crevice and the IR voltage drop theory , which attributes crevice corrosion to both the potential and composition changes within the crevice.
This thesis is classified into four chapters. While chapter 1 is only an introductory chapter tha... more This thesis is classified into four chapters. While chapter 1 is only an introductory chapter that summarizes the two mechanisms that are trying to explain localized corrosion of metals and alloys, Chapter 4 is the conclusions and future work chapter that presents the new achievements that have been added to the field of corrosion science by this work besides the proposed work to be done in the future. Chapters 2 and 3 are the core of this thesis and each of them has its own abstract, objective, and literature review, experimental, results and discussion, conclusions, and references list. In chapter 2, Crevice corrosion of an experimental Al 6111-like alloy with 0.68% Cu has been studied using potentiodynamic and potentiostatic techniques in different concentrations of sodium chloride and in 0.1M nitric acid solutions. Potentiodynamic experiments show that the alloy has an active/passive transition in a saturated sodium chloride solution at elevated temperatures (90 and 70 o C). Also, a steep electrode potential gradient, E(x), within the crevice has been measured using a microprobe connected to a SCE and controlled by a 3-D manipulator, and the observed locations of corrosion on the crevice wall are similar to the locations seen previously for systems in which it was clear that the shift of E(x) into the active peak region of the polarization curve on the crevice wall stabilized the crevice corrosion process. The same active peak E(x) relationship was observed for the Al 6111-like alloy in 0.1 M nitric acid solutions at room temperature.
Porous nanocrystalline carbon and nitrogen (CN)-doped TiO 2 photocatalyst was prepared using carb... more Porous nanocrystalline carbon and nitrogen (CN)-doped TiO 2 photocatalyst was prepared using carbon tetrachloride and polyaniline as precursors. The obtained powders were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), Raman spectroscopy, Fourier transform infrared (FT-IR) spectroscopy, and gravimetric analysis. The purpose of this work was to explore the state and location of nitrogen and carbon atoms introduced inside the TiO 2 lattice and to study the exploitation of the photocatalytic activity of the CN-doped TiO 2 for application in phenol degradation under UV illumination. After 30 min from the illumination onset, 64% and 57% of the phenol were degraded when the CN-doped TiO 2 and TiO 2 catalysts were used respectively. ª 2015 The Authors. Production and hosting by Elsevier B.V. on behalf of King Saud University. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
Aluminum industry produces hundreds of tons of spent pot lining (SPL) waste every year. SPL is cl... more Aluminum industry produces hundreds of tons of spent pot lining (SPL) waste every year. SPL is classified into two types: 1 st cut and 2nd cut. The 1 st cut SPL which is the material under study in this work is mainly composed of graphite (~ 60%), ceramic material and Al metal (~ 10%). On contrary with the 2nd Cut SPL, there is a consensus that the 1 st cut SPL is a hazardous material and must be treated be-fore dumping it in a landfill. Recycling it will be more beneficial if possible. The aim of this study is reviewing of the anodes paste that are used in Aluminum reduction cell by studying their structure and physical properties and suggesting new methods for choosing a new binders that could be satisfied and improved the current anodes. Moreover, by comparing anodes paste with the new inert anodes technology which now under development and that could be used to observe the difference in their structures and properties.