855 resultados para gel electrolytes


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Tesis (Maestría en Ciencias, con especialidad en Química Analítica) U.A.N.L.

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Tesis (Maestría en Ciencias con Especialidad en Ingeniería Cerámica) U.A.N.L.

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Tesis (Maestría en Ciencias con Especialidad en Ingeniería Cerámica) U.A.N.L.

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[Tesis] ( Maestría en Ciencias con Orientación a Ingeniería Cerámica ) U.A.N.L.

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Tesis (Maestría en Ciencias de la Ingeniería Mecánica con Especialidad en Materiales) UANL, 2010.

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Tesis (Maestría en Ciencias de la Ingeniería Mecánica con Orientación en Procesos Sustentables) UANL, 2012.

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Tesis (Maestría en Ciencias con Orientación en Farmacia) UANL, 2011.

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Tesis (Maestría en Odontología Avanzada) UANL, 2014.

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[Tesis] ( Doctor en Ciencias con Orientación en Ing. Cerámica) U.A.N.L.

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In the present work Titania bulk powders and coatings were prepared by subjecting titanium isopropoxide solution to a controlled hydrolysis-condensation process. The powders were characterized using techniques such as FTIR for their chemical interactions, TG-DTA for the thermal decomposition features, XRD for the phase assemblage, BET specific surface area analysis for the textural features. The study discusses the preparation methods and the characterization techniques employed and a detailed discussion on the physico-chemical characterization of the prepared systems. The influence of dopants and leaching on the physico-chemical properties as well as their influence on photo activity is also included. The structural/functional coatings of different Titania compositions includes in this study. Coatings on pre-treated glass surfaces with the best compositions prepared showed 90 % transmittance in the visible region.

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The thesis covers a systematic investigation on the synthesis of silica aerogels and microspheres with tailored porosity, at ambient conditions by varying the experimental parameters as well as using organic templates. Organically modified silica-gelatin and silica-chitosan hybrids were developed for the first time using alkylalkoxysilanes such as MTMS and VTMS. Application of novel silica-biopolymer antiwetting coatings on different substrates such as glass, leather and textile is also demonstrated in the thesis.

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Transition metal-loaded (3%) nanocrystalline sulfated titania (ST) powders are prepared using the sol–gel technique. Anatase is found as the active phase in all the samples. Sulfate ion impregnation decreases the crystallite size and stabilizes the anatase phase of TiO2. Acidity of the samples is found to increase by the incorporation of sulfate ion and also by the modification by transition metal ions. All the prepared catalysts are found stable up to 700 °C.