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Preparation of hybrid biomaterials for bone tissue engineering
Tissue engineering has evolved from the use of biomaterials for bone substitution that fulfill the clinical demands of biocompatibility, biodegradability, non-immunogeneity, structural strength and porosity. Porous scaffolds have been developed in many forms and materials, but few reached the need of adequate physical…
Magnesium and its alloys as degradable biomaterials: corrosion studies using potentiodynamic and EIS electrochemical techniques
Magnesium is potentially useful for orthopaedic and cardiovascular applications. However, the corrosion rate of this metal is so high that its degradation occurs before the end of the healing process. In industrial media the behaviour of several magnesium alloys have been probed to be better than magnesium performance…
Influence of ionic strength on the viscosities and water loss of bentonite suspensions containing polymers
A study was made of the influence of ionic strength (S) on the apparent (AV) and plastic (PV) viscosities and water loss (WL) of sodium bentonite suspension with polymers. Na-bentonite was dispersed in water (4.86% w/w) of different ionic strengths (S = 0.0, 0.015, 0.030 and 0.045 M) followed by the addition of polyme…
Materials Research - Ibero-american Journal of Materials: judicious, fair and educative!
Structural characterization of mullites synthesized by thermal decomposition of topaz
The structure of mullite obtained by thermal decomposition of topaz at 1340 °C and after additional thermal treatment at 1600 °C was characterized by 29Si and 27Al MAS NMR spectroscopy and x ray diffraction. No amorphous phase was detected by these techniques. The 29Si MAS NMR spectra of the mullite samples showed fou…
Buckling Response of Rectangular Laminated Composite Plates with Cutouts
Influence of different surface treatments on the fracture toughness of a commercial ZTA dental ceramic
The objective of this study was to investigate how mechanical surface treatments performed for removal of excess of molten glass, influence the fracture toughness of a dental zirconia toughened alumina (In-Ceram® Zirconia). Infiltrated ZTA disks were submitted to three different surface treatments (grinding, sandblast…
Deformation Due to Moving Loads at Boundary Surface
Characterization of ceramic powders used in the inCeram systems to fixed dental Prosthesis
InCeram (Vita Zahnfabrik- Germany) is known as a high strength ceramic being used for core crowns and for fixed partial denture frameworks. InCeram system consists of slip-casting technique which is used for to build the framework, which is then pre-sintered obtaining an open-pore microstructure. The material gains it…
Encapsulation of the alpha-tocopherol in a glassy food model matrix
alpha-tocopherol was encapsulated in a glassy food model based on solution of maltodextrin (DE 20) and gelatin, through the use of quick freeze and freeze-drying procedures. The ratio of the maltodextrin, alpha-tocopherol and gelatin was 3:2:1 respectively. The morphology of the glassy food model was observed by scann…
Effect of kaolin treatment temperature on mortar chloride permeability
The present paper discusses the results of chloride resistance tests conducted on ordinary Portland cement (OPC) mortars containing a Colombian kaolin pre-treated at temperatures of from 600 to 800 ºC. The resulting metakaolin (MK) was added to OPC mortar mixes in proportions of 10 and 20% by cement weight. The mortar…
Mechanical properties of hot mix asphalt made with recycled aggregates from reclaimed construction and demolition debris
The mix design for asphalt mixtures containing recycled aggregates from construction and demolition debris was evaluated. The tests conducted to characterize the mechanical behaviour of these mixtures showed that the mechanical properties of mixtures with recycled and virgin aggregate are similar. The asphalt mixtures…
Evaluation of shrinkage temperature of bovine pericardium tissue for bioprosthetic heart valve application by differential scanning calorimetry and freeze-drying microscopy
Bovine pericardium bioprosthesis has become a commonly accepted device for heart valve replacement. Present practice relies on the measurement of shrinkage temperature, observed as a dramatic shortening of tissue length. Several reports in the last decade have utilized differential scanning calorimetry (DSC) as an alt…
Effect of silica fume and SBR latex on the pasteaggregate interfacial transition zone
This paper deals with the effect of silica fume and styrene-butadiene latex (SBR) on the microstructure of the interfacial transition zone (ITZ) between Portland cement paste and aggregates (basalt). Scanning Electron Microscope (SEM) equipped with energy dispersive x ray analysis system (EDX) was used to determine th…
Effect of sterilization on the properties of CDHA-OCP-beta-TCP biomaterial
The effect of the method of sterilization on the physical, chemical and mechanical properties of a new bone repairing material was studied. The material was obtained by thermal hydrolysis of beta-tricalcium phosphate/orthophosphoric acid cement and was composed of calcium deficient hydroxyapatite, octacalcium phosphat…
Editorial
The effects of steel fibre reinforced concrete on system ductility
Steel fibre-reinforced concrete is being used extensively today in both field applications and experimental studies on concrete strength and ductility. The state of passive confinement generated by the fibre delays cracking and enhances ductility. The present paper reports on both experimental and analytical studies.…
Comparative study of porosity and pores morphology of unalloyed iron sintered in furnace and plasma reactor
Samples of unalloyed iron were sintered in the presence of an abnormal glow discharge using a confined anode-cathode configuration. The samples were placed on a holder acting as the discharge anode inside an AISI 1020 steel hollow cathode. Heating of the outer cathode was obtained by the bombardment of ions and energe…
Electrical Properties of (Bi,Y)4Ti3O12Thin Films Grown by RF Sputtering Method
Yttrium(Y)-substituted bismuth titanate <TEX>$(Bi_{4-x},Y_x)Ti_3O_{12}$</TEX> [x=0, 0.25, 0.5, 0.75, 1](BYT) thin films were deposited using an RF sputtering method on the <TEX>$Pt/TiO_2/SiO_2/Si$</TEX> substrates. The structural properties and electrical properties of yttrium-substituted <TEX>$(Bi_4-xYx)Ti_3O_{12}$</…