Sol-gel, One Technology by Produced Nanohybrid with Anticorrosive Properties

AbstractThe evolution of nanotechnology has been allowed modify the material properties since of chemical architecture. In this work, we development nanohybrids sol-gel process, silica particles are incorporated a functionalized polymer resin (type epoxy and/or phenolic) with carboxylic groups. When the metallic plate is coating formed film ceramic glass. The incorporation this particles into to polymeric matrix, allowed to obtain performance corrosive properties. The structural characteristics of the different materials prepared, phenolic resin (RF), the resin functionalized (RFF) and its corresponding hybrids (RF-SiO2 and RFF- SiO2), were studied by infrared spectroscopy and morphological changes were analyzed by scanning electron microscopy. Then cooper plates were coated with these materials to evaluate their corrosion performance. The corrosion performance evaluation for each of these coatings RF, RFF, RE- SiO2 and RFF- SiO2 were determined by the following tests: a misty saline chamber operated under accelerated corrosive conditions for corrosion advance measurement, abrasion and adhesion

Incorporation of Nanohybrid Films of Silica into Recycled Polystyrene Matrix

An alternative for the reutilization of polystyrene waste containers consisting in creating a hybrid material made of SiO2 nanoparticles embedded in a matrix of recycled polystyrene (PSR) has been developed. Recycled polystyrene functionalized (PSRF) was used to influence the morphological and antifog properties by the sol-gel synthesis of nanohybrid silica. To this end, silica nanoparticles were produced from alkoxide precursors in the presence of recycled polystyrene. The functionalization of this polymeric matrix was with the purpose of uniting in situ carboxyl and silanol groups during the sol-gel process. In this way, opaque or transparent solid substrates can be obtained, with each of these endowed with optical conditions that depend on the amount of reactants employed to prepare each nanohybrid specimen. The nanohybrids were labelled as SiO2/PSR (HPSR) and SiO2/PSRF (HPSRF) and their properties were then compared to those of commercial polystyrene (PS). All the prepared samples were used for coating glass substrates. The hydrophobicity of the resultant coatings was determined through contact angle measurement. The nanohybrid materials were characterized by FT-IR and 1H-NMR techniques. Additionally, TGA and SEM were employed to determine their thermal and textural properties

Biocompatible Metal-Oxide Nanoparticles: Nanotechnology Improvement of Conventional Prosthetic Acrylic Resins

Nowadays, most products for dental restoration are produced from acrylic resins based on heat-cured Poly(Methyl MethAcrylate) (PMMA). The addition of metal nanoparticles to organic materials is known to increase the surface hydrophobicity and to reduce adherence to biomolecules. This paper describes the use of nanostructured materials, TiO2 and Fe2O3, for simultaneously coloring and/or improving the antimicrobial properties of PMMA resins. Nanoparticles of metal oxides were included during suspension polymerization to produce hybrid metal oxides-alginate-containing PMMA. Metal oxide nanoparticles were characterized by dynamic light scattering, and X-ray diffraction. Physicochemical characterization of synthesized resins was assessed by a combination of spectroscopy, scanning electron microscopy, viscometry, porosity, and mechanical tests. Adherence of Candida albicans cells and cellular compatibility assays were performed to explore biocompatibility and microbial adhesion of standard and novel materials. Our results show that introduction of biocompatible metal nanoparticles is a suitable means for the improvement of conventional acrylic dental resins

Caracterización morfológica de asfalto modificado con diferentes copolímeros a altas concentraciones.

Se analizaron las microestructuras de asfalto modificado con diferentes copolimeros comerciales, estireno-butadieno-estireno (SBS), ethilen-vinil-acetato (EVA) y etilen-glicil-acrilato (EGA), mezclados con asfalto AC-20™, de Petróleos Mexicanos, mediante microscopia electrónica de transmisión. Las mezclas se realizaron con un mezclador de alto esfuerzo cortante a ISOOC por una hora. en un intervalo de concentración de lOa 12 % de polimero modificador

Viscoelasticidad no lineal en asfaltos modificados con polímero

El diseño y la construcción de carreteras y autopistas, así como materiales para impermeabilizar que tengan una vida útil más larga, es una de las prioridades de los ingenieros civiles.La selección de materiales adecuados con respecto a las condiciones climáticas y la frecuencia de la carga es la prioridad de los ingenieros químicos. El uso de los Asfaltos Modificados con Polímeros (AMPs) para estas aplicaciones, ha ido continuamente en aumento en todo el mundo, debido a que con una cantidad relativamente pequeña de polímero añadido, puede mejorar significativamente el rendimiento y durabilidad.En la práctica, la reología es una de las herramientas más útiles para el estudio de los AMPs. En particular, la reología no lineal puede dar una información única que ayuda a interpretar cómo el polímero se organiza íntimamente cuando se mezcla con el asfalto. En el pasado,muchos trabajos han descrito el comportamiento lineal de los AMPs. En este trabajo se presenta una breve descripción de las propiedades reológicas lineales. Sin embargo,la atención particular se ha puesto en obtener las propiedades reológicas no lineales tales como viscosidad de cizallamiento (y)o11 (y,t), a partir de las propiedades lineales medibles utilizando el modelo de Wagner-LodgeU·ll. La región viscoelástica no lineal se describe a través de una función Cfl(t, "i ) combinatoria memoria-amortiguamiento que depende del tiempo t y la deformación ó la velocidad de deformación y

Incorporation of Nanohybrid Films of Silica into Recycled Polystyrene Matrix

An alternative for the reutilization of polystyrene waste containers consisting in creating a hybrid material made of SiO2 nanoparticles embedded in a matrix of recycled polystyrene (PSR) has been developed. Recycled polystyrene functionalized (PSRF) was used to influence the morphological and antifog properties by the sol-gel synthesis of nanohybrid silica. To this end, silica nanoparticles were produced from alkoxide precursors in the presence of recycled polystyrene. The functionalization of this polymeric matrix was with the purpose of uniting in situ carboxyl and silanol groups during the sol-gel process. In this way, opaque or transparent solid substrates can be obtained, with each of these endowed with optical conditions that depend on the amount of reactants employed to prepare each nanohybrid specimen. The nanohybrids were labelled as SiO2/PSR (HPSR) and SiO2/PSRF (HPSRF) and their properties were then compared to those of commercial polystyrene (PS). All the prepared samples were used for coating glass substrates. The hydrophobicity of the resultant coatings was determined through contact angle measurement. The nanohybrid materials were characterized by FT-IR and 1H-NMR techniques. Additionally, TGA and SEM were employed to determine their thermal and textural properties

Nanopartículas de plata: Aplicaciones biomédicas

El impacto de la nanotecnología en diversos ámbitos de la biomedicina se incrementa día a dio, la implementación de diversos tipos y combinaciones de nanomateriales ha permitido obtener mejores herramientas para el diagnóstico y tratamiento de enfermedades. El uso de nanopartícuIas metálicas, específicamente nanopartículas de plata, se ha generalizado; algunos de los retos en su implementación es la búsqueda del método de síntesis, tamaño, morfología y dosis ideales para tratar problemas relacionados a infecciones sistémicas mediadas por microorganismos patógenos; en el desarrollo de nuevos dispositivos de diagnóstico, biosensores y en tratamientos contra el cáncer, evidenciado el potencial que estas nanopartículas ofrecen para tratamientos médicos y preventivos

Estado del arte del proceso sol-gel en México

A bibliographical research was conducted in order to present the state of art of sol-gel process.A partir de una revisión bibliográfica, realizada por alumnos de la Maestría en Ciencia e Ingeniería de Materiales de laUNAM, se muestra el estado del arte del proceso sol-gel en México

Estado del arte del proceso sol-gel en México

A partir de una revisión bibliográfica, realizada por alumnosde la Maestría en Ciencia e Ingeniería de Materiales de laUNAM, se muestra el estado del arte del proceso sol-gel en México.A bibliographical research was conducted in order to present the state of art of sol-gel process