The high efficiency of corrosion inhibition of synthetic organic inhibitors in the industries of chemical cleaning, acid etching, acidification of oil wells and acid desalination is well recognized. However, most of these inhibitors are toxic to the environment and human health. This has forced to look for more secure corrosion inhibitors called "green corrosion inhibitors" due to its non-toxicity, biodegradability and low cost. In recent years, the use of natural polysaccharides as an environmentally safe corrosion inhibitor has received special attention. For this reason, the present study, evaluates the mucilage of Linum usitatissimum, which contains a high content of polysaccharides, as a corrosion inhibitor of ASTM A335 grade P11 steel in HCl -1.0 M.

El objetivo del estudio es Desarrollar nuevas membranas biocompatibles basadas en biopolímeros conjugados con nanopartículas ferroeléctricas de titanato de bario, manteniendo sus propiedades piezoeléctricas, con potencial aplicación en implantes que aceleren el proceso de osteogénesis. Metodología: El diseño es experimental. El procedimiento será el siguiente: 1. Optimización del tratamiento de recocido de las nanopartículas de titanato de bario (BaTiO3) para la formación de la estructura ferroeléctrica y, su modificación superficial con grupos hidroxilos (-OH). 2. Caracterización morfológica (por Microscopia electrónica de barrido-MEB y de transmisión), tamaño promedio y potencial Z (Dynamic light scattering-DLS), estructura cristalina (por difracción de rayos X), estructura química por FTIR de las nanopartículas ferroeléctricas de titanato de bario. 3. Formación...

In this study, the inhibition of the corrosion of ASTM A192 steel in HCl 0,5 M at temperature different, by the Linum usitatissimum mucilage, was investigated using techniques: Tafel extrapolation, linear polarization resistance, electrochemical impedance spectroscopy and electrochemical frequency modulation. The Linum mucilage acts as an optimum corrosion inhibitor of ASTM A192 steel in HCl. The average inhibition efficiency obtained with the evaluated techniques were of 84,3% at 25 °C, 89,0% at 45 °C and 91,8% at 65 °C, with a concentration of the mucilage of 1 g/l. It was found that the efficiency of inhibition and the adsorption constant increased with increasing temperature. The standard enthalpy of adsorption was positive and the apparent activation energy decreased with the increase of the concentration of the mucilage. All these parameters indicate that the adsorption of flaxs...

In this study, the inhibition of the corrosion of ASTM A192 steel in HCl 0,5 M at temperature different, by the Linum usitatissimum mucilage, was investigated using techniques: Tafel extrapolation, linear polarization resistance, electrochemical impedance spectroscopy and electrochemical frequency modulation. The Linum mucilage acts as an optimum corrosion inhibitor of ASTM A192 steel in HCl. The average inhibition efficiency obtained with the evaluated techniques were of 84,3% at 25 °C, 89,0% at 45 °C and 91,8% at 65 °C, with a concentration of the mucilage of 1 g/l. It was found that the efficiency of inhibition and the adsorption constant increased with increasing temperature. The standard enthalpy of adsorption was positive and the apparent activation energy decreased with the increase of the concentration of the mucilage. All these parameters indicate that the adsorption of flaxs...

Spherical titanium barium nanoparticles with an average size about 100 nm in the tetragonal crystal phase were obtained by peroxide synthesis. To prevent their agglomeration and reduce the toxic effect, the surface of nanoparticles was chemically modified with sodium oleate and chitosan. Influence of surface modification by these compounds on agglomeration of nanoparticles in aqueous solutions, their spectral features, as well as generation of the second optical harmonic were investigated.

Comprende el estudio de las microfibras de un textil (camiseta) de la cultura Chimú. Esta cultura se desarrolló en la costa norte del Perú. Para determinar la materia prima y calidad estructural de las microfibras, los resultados del textil Chimú fueron comparados con los correspondientes para las microfibras del algodón de la costa norte del Perú (algodón nativo). Las imágenes de microscopia electrónica de barrido revelaron que los hilos del textil Chimú están compuestos por un conjunto de microfibras entrelazadas. Las técnicas de espectroscopia de rayos X por energía dispersiva y de plasmas inducidos por láser permitieron identificar átomos característicos de la celulosa en las microfibras del textil Chimú y del algodón nativo.