Materials Literature
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The interactions of metal ions with Ligand (L5) and Ligand (L6) at various ionic strength in 70% DMF-water mixture is investigated by Calvin-Bjerrum pH-metric technique at 28 10C. The ionic strength data were used to study the correct mechanism of complexation reaction. The thermodynamic properties of electrolyte solu…
The thermal properties and miscibility of cellulose acetate (CA) and industrial waste lignin (L) blends were investigated by thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), scanning electron microscopy (SEM) and Fourier transform infra-red spectroscopy (FTIR) over the entire range of composi…
Des composés azaoxa[4]helicenes cationiques possédant une structure non-symétrique et hélicoïdale ont été synthétisés. Deux différentes approches mettant en jeu deux étapes de synthèse à partir d'un même précurseur ont été explorées. Afin de rendre possible la purification de l'azaoxa[4]helicenes, une nouvelle méthode…
Polythiophene (PTh) has attracted much attention because of its high electrical conductivity, good thermal stability, ease and high redox activity, stability and good mechanical properties. In the present work, samples of PTh were synthesized by using chemical oxidative polymerisation method with different concentrati…
Terpolymeric ligand was prepared by the condensation of phydroxyacetophenone (P) and aniline (A) with formaldehyde (F) with 1:1:3 molar proportions in the presence of hydrochloric acid as a catalyst. Polychelates were prepared by using metal acetate, metal salts and PAF ligand in DMF medium. In the present paper, elec…
The aim of the research work was to investigate the corrosion behaviour of basalt short fiber reinforced aluminum metal matrix composites (MMCs) in alkaline solution using weight loss method. The Al/basalt MMCs contains basalt short fiber from 2.5 to 10 % in steps of 2.5 wt. % and fabricated using liquid metallurgy te…
Thesis. M.E. American University of Beirut. Department of Mechanical Engineering, 2014. ET:6065
The terpolymer resins abbreviated as HPEG-I and HPEG-II were synthesized by polycondensation of p-hydroxybenzaldehyde, terephthalic acid and ethylene glycol using molar ratio 1:1:3 and 2:1:4 of monomers in presence of polyphosphoric acid as catalyst. The tentative structures of these resins were determined by Elementa…
This thesis studies the anisotropic magneto-resistance (AMR) in electronically phase separated La0.7-xPrxCa0.3MnO3 (LPCMO) epitaxial thin films. Different Pr doping levels, epitaxial strain, magnetic fields, temperature and two dimensional confinement effects have been used to understand this fundamental spintronics p…
Thin films of hafnium oxide (HfO2) deposited by atomic layer deposition (ALD) have been studied extensively as a high-k replacement for the SiO2 gate in field effect transistors. The use of ALD process allows one to grow homogeneous thin films at low temperatures with a precise control of thickness [1]. Some important…
In the present work multilayered micro/nanocrystalline (MCD/NCD) diamond coatings were developed by Hot Filament Chemical Vapour Deposition (HFCVD). The aim was to minimize the surface roughness with a top NCD layer, to maximize adhesion onto the Si3N4 ceramic substrates with a starting MCD coating and to improve the…
With the rapid development of industry, air and water pollution has become a critical topic to the public and scientific community since the quality of air and water is essential for the prosperity of life. In this study, two novel adsorbents, Fe3O4@polydopamine (PDA)-Ag microspheres and SBA-15-Ag composites, have bee…
The main limitation of the current method for predicting spacecraft catastrophic fragmentation upon collision with large debris is the total independence of the critical value of the energy-to-target mass ratio from both the satellite configuration and impact point. In fact, each target has its own disintegration ener…
In the upgrading of heavy feeds, it is essential to avoid the onset formation of mesophase, which is considered a precursor for coke formation. The formation of this aromatic dense phase leads to serious problems such as catalyst deactivation, limiting the vacuum residue conversion, and fouling in the reactors and the…
1-(2'-Furyl)-3-(2"-hydroxy-5"-chloro-3"-substituted phenyl)-1,3-propanedione(Iac) reacts with sulphuryl chloride in dioxane to give 3-chloro-2-(2'-furyl)-6-chloro substituted chromone (IIa-c). (Ia-c) reacts with Br2 in dioxane to yield 3-bromo-2-(2'furyl)-6-chloro-8-substituted chromone (IId-f). Similarly, (Ia-c) also…
Photocatalytic degradation of organic pollutants by metal oxide has attracted significant attention by researchers because of its usefulness in handling environmental contaminants. Due to the fact that the photo-generated holes in the valence band and the photo-generated electrons in the conduction band of an excited…
The equilibrium constant in the standard state Kstd for the uni-bivalent ion exchange between the resin (R) and the aqueous solution (aq)
Existing methods to investigate preferential weld corrosion are dominated by empirical data. Such empirical models are limited in representing realistic corrosion mechanism which has segmented regions and individual of localised corrosion. Thus, it needs a concept that can interprete both each segmented regions and mu…
International audience
В работе исследованы состав, структура и механические свойства сварных соединений жаропрочных титановых сплавов ВТ8 и ВТ3-1, полученных аргонно-дуговой сваркой с применением опытных присадочных материалов, модифицированных иттрием. Установлено влияние структурного состояния присадочных материалов (литое и субмикрокрис…