Artículos y presentaciones en Congresos
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Examinando Artículos y presentaciones en Congresos por Autor "Cabello, Carmen Inés"
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Acceso Abierto Dynamic laser speckle technique as an alternative tool to determine hygroscopic capacity and specific surface area of microporous zeolites(2018) Mojica Sepúlveda, Ruth Dary; Mendoza Herrera, Luis Joaquín; Grumel, Eduardo Emilio; Soria, Delia Beatriz; Cabello, Carmen Inés; Trivi, Marcelo RicardoAdsorption phenomena have several technological applications such as desiccants, catalysts, sep- aration of gases, etc. Their uses depend on the textural properties of the solid adsorbent and the type of the adsorbed liquid or gas. Therefore, it is important to determine these properties. The most common measurement methods are physicochemical based on adsorption of N2 to determine the surface area and the distribution of pores size. However these techniques present certain limi- tations for microporous materials. In this paper we propose the use of the Dynamic Laser Speckle (DLS) technique to measure the hygroscopic capacity of a microporous natural zeolite and their modi ed forms. This new approach based on the adsorption of water by solids allows determine their speci c surface area (S). To test the DLS results, we compared the obtained S values to those calculated by di erent conventional isotherms using the N2 adsorption-desorption method. - Artículo
Acceso Abierto Hydro-Adsorption Study by Dynamic Laser Speckle of Natural Zeolite for Adsorbent and Fertilizer Applications(2016) Mojica Sepúlveda, Ruth Dary; Mendoza Herrera, Luis Joaquín; Agosto, María Florencia; Grumel, Eduardo Emilio; Soria, Delia Beatriz; Cabello, Carmen Inés; Trivi, Marcelo RicardoThe dynamic behavior caused by hydro-adsorption process of materials based on a rich mineral clinoptilolite together with their acidic, basic and calcinated forms has been studied by the dynamic laser speckle (DLS) technique. We propose a modified Peleg’s equation to improve fitting of DLS data. Textural (BET), structural (XRD) and spectroscopic (FTIR) properties were also studied and compared. We demonstrated that DLS was the most sensitive, simple and inexpensive method for comparing the performance of adsorptive materials with slightly modified surfaces. It also allowed the correlation with physicochemical properties.