Materials Literature
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Crystalline, electric and fracture properties of Pb(Zr0.52Ti0.48)O3 (PZT) thin films are strongly affected by annealing temperatures in rapid treatment annealing (RTA) of metal organic decomposition (MOD). X-ray diffraction (XRD), RT66A standard ferroelectric analyzer and Vickers indentation method were used to invest…
Novel approach to rheological modelling of a fly ash-water mixture is proposed. The model is first tested against the available experimental data for a corn starch-water, a glass beads-water and a fly ash-water mixture and then used taking the advantage of available CFD code for a calculation of major and minor losses…
This work presents an experimental investigation which correlates the flexure load capacity loss of reinforced concrete beams with the amount of steel cross section loss due to localized corrosion of the embedded steel. Concrete beams (100x150x1500 mm) with the central portion contaminated by chlorides, placed during…
In this study, the MAXIM technique was used in an attempt to clarify the phase transformation sequence that occurs during in situ annealing of galvanized samples. A diffractometer equipped with a novel imaging system comprising a Micro-Channel Plate in front of a CCD camera was used. The galvanized samples were produc…
The distance of concrete structures from the sea is an important aspect when studying the deleterious effect of airborne salinity in marine environment zone. It permits to know how the durability of structures is affected by increasing the distance from the sea. This paper presents results of an experimental work on a…
The ASTA4 876-91 standard establishes a corrosion forecast of concrete reinforced bar by measuring the electrochemical potential. This forecast is based on thermodynamic considerations without taking into account the kinetic of the corrosion process. A comparison was made between the results obtained based on this sta…
This paper deals with theoretical foundations of micromechanical constitutive modeling of porous polycrystalline ceramic materials under compression. The porosity of the material is assumed to be closed and distributed in grains and along grain boundaries. It strongly influences both material elastic features and micr…
This work is part of an International Cooperation Agreement for the conservation of historical monuments made of reinforced concrete in Brasilia. This research is based on a routine inspection of the National Theatre of Brasilia, a city recognized by UNESCO in 1987 as world cultural heritage. The structure, entirely m…
This paper analyzes the use of recycled construction and demolition debris as aggregate for the construction of concrete blocks to be used in sealing masonry. Initial studies addressed the definition of parameters used in the mix of conventional materials (traditionally used in the production of concrete blocks), invo…
The present work evaluates the method of electrochemical extraction of chloride ions for the rehabilitation of corroded concrete structures. The influence of the concrete cover and the water-to-cement ratio in the efficiency of the method was studied by determining the initial and the final chloride content. Electroch…
The tetragonal to monoclinic (t–m) phase transformation of zirconia has been the object of extensive investigations of the past 20 years and is now recognized as being of martensitic nature. However, martensitic transformation has only been observed by transmission electron microscopy or indirect methods. Though the b…
Our continuing research on the preparation, characterization, materials properties, and biodegradability of polylactide (PLA)/organically modified layered silicate (OMLS) nanocomposites has yielded results on PLA/montmorillonite nanocomposites. Montmorillonite (mmt) modified with dimethyldioctadecylammonium cation was…
Abstract Synthetic materials considered for biohybrid skin or other tissue engineering applications have to support cellular interaction and colonisation of implants. However, despite the number of studies reported in the literature, there is no agreement on the principal factors applicable to modulate the interaction…
Superparamagnetic iron oxide nanoparticles have been used for many years as magnetic resonance imaging contrast agents or in drug delivery applications. Tissue and cell-specific drug targeting by these nanoparticles can be achieved by employing nanoparticle coatings or carrier-drug conjugates that contain a ligand rec…
Biocompatibility relies essentially on surface phenomena, represented by cell-cell, cell-material and material (polymer)-protein interactions. An in vivo and in vitro experimental investigation was carried out on the biomaterials of two different classes with a good potential for in situ utilisation. Non-resorbable (P…
Summary Recent laboratory research in a wide range of porous media shows that creating foam in steady flow in homogeneous media requires exceeding a minimum pressure gradient ∇pmin. Data fit trends predicted by a model in which foam generation depends on attaining sufficient ∇p to mobilize liquid lenses present before…
In this article we review some of the basic aspects of rare earth spectroscopy applied to vitreous materials. The characteristics of the intra-atomic free ion and ligand field interactions, as well as the formalisms of the forced electric dipole and dynamic coupling mechanisms of 4f-4f intensities, are outlined. The c…
Abstract : Releases of Dense Non-Aqueous Phase Liquids (DNAPLs) at a large number of public and private sector sites in the United States pose significant challenges in site remediation and long-term site management. Extensive contamination of groundwater occurs as a result of significant dissolved plumes generated fr…
Acid-soluble collagen (ASC) and pepsin solubilized collagen (PSC) were isolated from the skins of black drum (Pogonias cromis) and sheepshead seabream (Archosargus probatocephalus) harvested in the Gulf of Mexico coastal waters. The yields of ASCs on dry basis from black drum and sheepshead were estimated at 2.3 and 2…
Metal-ceramic joining has slowly but steadily become an important manufacturing step. The evolution of joining processes has allowed ceramics to be used in combination with metals in a number of hybrid devices from traditional light bulbs and seals to improved cutting tools and modern monitoring and measuring electron…