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Conservation of the stone in Cibeles Fountain, Madrid , Spain
The water in Cibeles Fountain flows in a closed circuit and is replaced every 6 months. After this period of time, an increase in bicarbonate, sulfate, calcium and magnesium contents is registered in the water, as well as a slight increase in its acidity. This acidity, favored by atmospheric pollution, is the main cau…
Influence of Calcification Solution on in vitro Chitosan Mineralization
The influence of the calcification solution on the mineralization of chitosan membranes was analysed. Two factors were studied: pH and chemical composition (excess of calcium or phosphate ions) of solutions. Substrates (membranes) of chitosan underwent mineralization by soaking in calcification solutions for 7 days at…
Evaluation of hexahydrated magnesium chloride (Bischofite) performance as a chemical stabilizer of granular road surfaces
Hexahydrated Magnesium Chloride or Bischofite is a salt. It has different properties that enable it to be useful as a chemical stabilizer of granular road surfaces: its capacity of absorbing and retaining humidity from its surrounding environment, increases water surface tension and decreases its vapor pressure. The o…
Acto conmemorativo del 50 aniversario de la revista Materiales de Construcción
Determination of the OH- Content in the aqueous phase of hardened cementitious materials by an empirical Leaching method
The most reliable method to determine the concentration of hydroxyl ions in the aqueous phase of hardened cementitious materials is the squeezing of concrete at high pressures. However, this method needs special equipment as well as a relatively high amount of sample to be carried out. In present research, the determi…
Surface Modification of Polymeric Materials by Plasma Treatment
Low-temperature plasma treatment has been used in the last years as a useful tool to modify the surface properties of different materials, in special of polymers. In the present work low temperature plasma was used to treat the surface of asymmetric porous substrates of polysulfone (PSf) membranes. The main purpose of…
Electrochromic Properties of Sol-gel Coating of Nb2O5 and Nb2O5:Li+
Thin solid films of Nb2O5 and Nb2O5:Li+ were prepared by the sol-gel process using the sonocatalytic method. The films reported here were prepared from a NbCl5 as precursor and butanol as solvent. Through the addition of lithium salt LiCF3SO3 to the precursor solution, films with different electrochemical performance…
Structural Evaluation and Performance of Portland Cement Concretes After Exposure to High Temperatures
We evaluated the "residual" thermal conductivity of Portland cement concretes (with characteristic compressive strength at 28 days, f ck, of 20 MPa and 50 MPa) at room temperature after heat-treating at 180 °C, 300 °C and 600 °C. The description of the geometry of the structure was carried out using mercury intrusion…
Ultrasonic Measurements In Brazilian Hardwood
This paper reports on a study of the application of ultrasound waves in wood with the purpose of evaluating the latter's mechanical properties. The evaluation is based on the correlation between the speed of sound, modulus of elasticity and density. The speed of transmission is sensitive to the material's quality-dete…
Synchrotron SAXS Studies of Nanostructured Materials and Colloidal Solutions: A Review
Structural characterisations using the SAXS technique in a number of nanoheterogeneous materials and liquid solutions are reviewed. The studied systems are protein (lysozyme)/water solutions, colloidal ZnO particles/water sols, nanoporous NiO-based xerogels, hybrid organic-inorganic siloxane-PEG and PPG nanocomposites…
Evolution and quantification of the main Sensitisers in commercial portland cements
The commercial Portland cements contain minor elements in their chemical compositions. The presence of these elements has a direct incidence in different aspects: rheological behaviour, reaction kinetics, environmental, etc. Some of them also have a negative effect on the human health; so, chromium (Cr), nickel (Ni) a…
Materials Research - Revista Ibero-americana de Materiais: Criteriosa, justa e educativa!
Hydrous Tantalum Phosphates for Ion Exchange Purposes: A Systematic Study
This work describes two methods of preparation of hydrous tantalum phosphates and their characterization as ion exchangers. The hydrous metallic phosphate compounds were chemically and physically characterized by thermal gravimetric analysis, X-ray diffractometry and surface area measurements. By the first method, tan…
Transição de Fase Difusa e Propriedades Dielétricas de Cerâmicas Ferroelétricas de (Pb, Ba)Nb2O6
Tungsten bonze structured lead barium niobate (Pb1-xBa xNb2O6) ferroelectric ceramics were prepared by the conventional mixed oxide method and their dielectric properties were carefully investigated. All studied samples presented elevated values of maximum dielectric constant (epsilon'm) and its corresponding temperat…
Influence of Fiber Length Distribution on Strength Efficiency of Fibers in Yarn
The tensile and tear strengths and hence the durability of a cotton fabric are greatly influenced by the length and strength of cotton fibers in addition to the fabric structure. This is so because fiber length to a large extent determines yam strength, which ultimately contributes to fabric strength. Also, fiber leng…
The Coordination of CuII in Zeolites − Structure and Spectroscopic Properties
Zeolites loaded with transition metal ions are promising heterogeneous catalysts. Knowledge about the location and structure of the metal centers is of paramount importance for the understanding of the catalytic potential of these materials. In this work, the spectroscopic studies of the coordination of CuII in zeolit…
Clay Mineralogy of Phyllic and Intermediate Argillic Alteration at Bingham, Utah
The earliest alteration mineral zones in the porphyry Cu-Mo-Au ore deposit at Bingham, Utah, include the outermost propylitic and inner potassic alteration of igneous rocks. Innermost phyllic and intermediate argillic alteration is superimposed on propylitic and potassic alteration. Petrographic, X-ray diffraction, an…
Three-Dimensional Computer Modeling of Warp Knitted Structures
In this work, a 3D computer aided designing (CAD) system is developed for solid modeling and visual simulation of warp knitted structures on Silicon Graphics workstations. In the first part, a three-dimensional cylindrical and uniform solid yarn model is developed, such that its central axis is a space curve, using no…
A VO2-Based Multifunctional Window with Highly Improved Luminous Transmittance
A novel window structure composed of VO 2 thermochromic film with TiO 2 antireflection (AR) coating was proposed. TiO 2 was chosen as the best AR candidatefor reasons that it is an AR material superior to the reported SiO 2 , and that it is capable to make the window multifunctional with excellent photocatalytic prope…