La mecano-síntesis es una técnica de producción de nuevos materiales metálicos en fases fuera del equilibrio termodinámicos, tales como soluciones sólidas extendidas, solcuiones sólidas amorfas, fases nanocristalinas, fases nanovítreas, cuasicristales. entre algunas de las más importantes. Su característica principal es que  no necesita pasar por  los elevados puntos de fusión de los metales o de las aleaciones metálicas reactantes. El presente trabajo realiza una descripción del fundamento teórico y la parte experimental de la técnica de mecanosíntesis.

This work deals with the characterization study by 57Fe Mössbauer spectroscopy of natural rocks with high content of iron oxides and iron compounds such as magnetite Fe3O4 and magnetite with chalcopirite Fe3O4.CuFeS2. This study presents also a comparative study using X-ray diffraction. The diffraction pattern belonging to magnetite was analyzed with the Rietveld refinement method obtaining results that agree with the information available for natural samples. Mössbauer measurements at low temperatures were undertaken with the purpose of identifying the different strucural sites for Fe ions in samples with high magnetite content.

The extensive utilization of dyes across diverse industries has resulted in environmental pollution, leading to the degradation of water bodies. To prevent environmental contamination, the use of eco-friendly dyes and innovative processes for dye degradation is crucial. This study aimed to investigate the color removal process of cochineal dye (Dactylopius coccus Costa) using the atmospheric pressure plasma jet (APPJ: Atmospheric Pressure Plasma Jet) technique. The dye extracted from the cochineal insect was treated with APPJ and the resulting color removal process was analyzed. Optical emission spectroscopy (OES) was used to investigate the plasma emission lines, and UV-Vis spectroscopy was used to monitor the color removal process. The results revealed that the decolorization of cochineal dye was a result of an oxidative degradation process caused by the interaction of the reactive spe...

The author(s) disclosed receipt of the following financial support for the research, authorship, and/or publication of this article: J.C.-V. thanks to Circulo de Investigacion e Innovacion de Materiales Avanzados para la Industria y Biomedicina of FONDECYT (CONCYTEC) under grant No 011-2014-FONDECYT, and to the Brazilian Society of Physics (PLAF program) that financed part of this work. C. V.L., J.Q.-M. and V.P.R. are grateful to FONDECYT (CONCYTEC) for financial support through the Excellence Center Program.