Artículos y presentaciones en Congresos

URI https://digital.cic.gba.gob.ar/handle/11746/94

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  • El territorio como escenario para el diseño: el caso de la fiesta del barro en Punta Indio
    ( 2019) Aguyaro, Mariano Javier
    Hemos sido formados por una matriz académica donde el único conocimiento considerado como “valido” es aquel proveniente de la visión cientificista europea. En consecuencia, se fueron perdiendo muchos saberes, cosmovisiones y formas de entender la realidad tanto de los pueblos originarios, como así también las propias de la particular hibridación cultural de nuestro territorio. Del mismo modo, el Diseño Industrial es una disciplina importada que se impuso en nuestro continente bajo una metodología proyectual científico positivista y se consolido como el dogma para el “buen diseño”. Postura que término por ningunear y desplazar cualquier otra producción por fuera de estos cánones, es decir, a aquellos objetos con características locales o ancladas a los valores culturales de un territorio en particular. Sin embargo, esas producciones, responden al universo simbólico de la cultura que lo origina, se encuentran implícitos saberes que construyen a través de las prácticas cotidianas y de su tradición. Es por ello que se sostiene aquí que es innegable su potencial contribución para ampliar nuestra perspectiva disciplinar. Para dar cuenta de esta posición se toma como caso la experiencia desarrollada en la 3ª y 4ª Fiesta del Barro en Punta indio.
  • Zeolitas sintetizadas a partir de vidrio volcánico en medio alcalino
    ( 2017) Locati, Fransisco ; Marfil, Silvina Andrea ; Lescano, Leticia ; Madsen, Lenis ; Cravero, Fernanda ; Castillo, Luciana Alicia ; Barbosa, Silvia ; Maiza, Pedro
    In this work, synthesis studies were performed using a partially zeolitized vitreous tuff (rich in mordenite) from the province of Mendoza, with 0.1, 0.5 and 1N NaOH solutions at temperatures of 40 and 95°C. The process was monitored by X-ray diffractometry and scanning electron microscopy. Experiences showed that the material can be homogenized improving its crystallinity, transforming the relict glass and mordenite in to a Na-P zeolite of phillipsite-Na family (Na5,7Al5,7Si10,3O32.12H2O) with subordinate analcime and problable chabazite. The reaction evolution was more effective and fast ar 95ºC in 1 N NaOH solution.
  • Intensity of sulfonitric treatment on multiwall carbon nanotubes
    ( 2017) Gómez, Sofía ; Rendtorff Birrer, Nicolás Maximiliano ; Aglietti, Esteban ; Sakka, Yoshio ; Suárez, Gustavo
    We present a study of sulfonitric treatment and its effect on MWCNTs at different temperatures (90, 110, 130 and 150°C) using DRX, XPS, FTIR, Raman spectroscopy, TEM and zeta potential. It was found that oxidation starts with the C-C and C-H bonds generating different oxidized groups from alcohol to carboxylic acid, following a sequential oxidation. Given that heterocoagulation needs a maximum zeta potential gap between the ceramic and the MWCNT surface and it significantly exist a risk of manipulate acids at high temperature it is recommended to use acid treatment of CNT at 110 °C for generating ceramic composites by heterocoagulation.
  • Surface modification of multiwall carbon nanotubes by sulfonitric treatment
    ( 2016) Gómez, Sofía ; Rendtorff Birrer, Nicolás Maximiliano ; Aglietti, Esteban ; Sakka, Yoshio ; Suárez, Gustavo
    Carbon nanotubes are widely used for electronic, mechanical, and optical devices due to their unique structural and quantum characteristics. The species generated by oxidation on the surface of these materials permit binding new reaction chains, which improves the dispersibility, processing and compatibility with other materials. Even though different acid treatments and applications of these CNT have been reported, relatively few research studies have focused on the relationship between the acid treatment and the formation of nanodefects, specific oxidized species or CNT surface defects. In this work, multiwall carbon nanotube (MWCNT) oxidation at 90°C was characterized in order to determine the acid treatment effect on the surface. It was found that oxidized species are already present in MWCNT without an acid treatment, but there are not enough to cause water-based dispersion. The species were identified and quantified by infrared spectroscopy and X-ray photoelectron spectroscopy. Also, transmission electron microscopy observations showed not only modifications of the oxidized species, but also morphological damage on the surfaces of MWCNT after being subjected to the acid treatment. This effect was also confirmed by Raman spectroscopy. The acid treatment generates higher oxidized species, decreasing the zeta potential in the whole pH range.
  • Relation between mechanical and textural properties of dense materials of tetragonal and cubic zirconia
    ( 2016) Gómez, Sofía ; Suárez, Gustavo ; Rendtorff Birrer, Nicolás Maximiliano ; Aglietti, Esteban
    In the current paper we present a study of the sinterability of two zirconia (ZrO2) nanopowders with different content of yttrium oxide (Y2O3) 3 and 8 % tetragonal and cubic zirconia, respectively. After sintering between 900-1500ºC, the samples were characterized in terms of their density and porosity using Archimedes technique. Their grain size was evaluated using scanning electron microscope (SEM). Vickers hardness and fracture toughness (KIC) were measured by the indentation method. The results showed that pores are almost eliminated at sintering temperatures higher than 1400ºC and grain size is larger due to the agglomerates formed as a result of grain growth. Vickers hardness evaluated at 1400ºC sintering temperature is greater than that obtained at 1500ºC due to the grain growth produced at this temperature. In addition, we show a correlation between Vickers hardness and the porosity, obtained by evaluating empirical and theoretical models.