Publication: Puesta en marcha y aplicación a polvos cerámicos del método de reflectancia difusa en espectroscopía de infrarrojo
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2012-04-26
Defense date
2012-04-25
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Abstract
La Espectroscopia de Infrarrojos (IR) es un método muy usado en investigación e industria para realizar controles de calidad y mediciones dinámicas de forma sencilla y fiable. Al medir a una frecuencia específica a lo largo del tiempo, se pueden determinar cambios en el carácter o la cantidad de un enlace particular. Los espectrómetros modernos de investigación pueden tomar mediciones infrarrojas a lo largo de todo el rango de interés con una frecuencia de hasta 32 veces por segundo. Esto hace que la observación de reacciones químicas y procesos sea más rápida y precisa. El término espectroscopia infrarroja con transformada de Fourier (FTIR) se origina en el hecho de que una transformada de Fourier (un algoritmo matemático) es necesario para convertir los datos en bruto en el espectro real. La reflectancia difusa (DRS) está presente cuando el espectro es función de los fenómenos de adsorción y de los de dispersión que se producen al analizar muestras fuertemente dispersantes como polvos. La DRS no es una técnica de superficie ya que las medidas también reflejan la composición de todo el conjunto. No obstante puede servir para estudiar la superficie si se deposita una fase sobre un substrato que nos dé un espectro en la misma región. La técnica más apropiada para estudiar superficies es mediante FTIR-ATR. El objetivo principal de este proyecto es la puesta a punto del accesorio de infrarrojo para el análisis FTIR-DRS y su aplicación a polvos cerámicos. Para llevar a cabo este objetivo se estudiará los manuales proporcionados por la casa proveedora del equipo y se realizará un esquema de utilización del accesorio para el espectrómetro de infrarrojo. A su vez se buscará información sobre las últimas líneas de investigación y se buscará la optimización de los ensayos. Para la puesta a punto se utilizarán polvos cerámicos (SiC, B4C… de diferentes granulometrías), evaluando los espectros obtenidos. Se hará una comparativa de nuestros resultados con los espectros obtenidos mediante otras técnicas de espectroscopia infrarroja con el fin de comprobar la validez de nuestros ensayos y las desviaciones de los mismos. Finalmente, con los resultados experimentales obtenidos se podrán extraer unas conclusiones, que aplicadas en este campo abren un amplio abanico de posibilidades y aplicaciones a diversos procesos industriales. _______________________________________________________________________________________________________________
Infrared spectroscopy is a method widely used in research and industry for quality control and dynamic measurements easily and reliably. By measuring at a specific frequency over time, can determinate changes in the character or quantity of a particular link. Modern research spectrometers can take infrared measurements across the entire range of interest at a rate of up 32 times per second. This makes the observation of chemical reactions and processes more quickly and accurately. The term spectroscopy Fourier transform infrared (FTIR) originates in the fact that a Fourier transform (a mathematical algorithm) is needed to convert raw data into real spectrum. The diffuse reflectance (DRS) is present when the spectrum is based on adsorption phenomena and scattering that occur when analyzing samples such as powders strongly dispersing. DRS is a technique that measures surface and also reflect the composition os the whole. However, it can be used to study the surface if a phase is deposited on a substrate to give us a spectrum in the same region. The technique is suitable for studying surfaces by FTIR-ATR. The main objective of this project is the development of infrared point of attachment to the FTIR-DRS analysis and its application to ceramic powders. To accomplish this objective study the manuals provided by the provider of equipment and will be an accessory use scheme for the infrared spectrometer, At the same time will seek information on the last lines of investigation and search optimization trials. For the set up was used ceramic powders (SiC, B4C… of different grain sizes), evaluating the spectra obtained. There will be a comparison of our results with spectra obtained by other means of infrared spectroscopy to verify the validity of our assays and deviations from them. Finally, experimental results may draw conclusions that applied to open a wide field of possibilities and applications to various industrial processes.
Infrared spectroscopy is a method widely used in research and industry for quality control and dynamic measurements easily and reliably. By measuring at a specific frequency over time, can determinate changes in the character or quantity of a particular link. Modern research spectrometers can take infrared measurements across the entire range of interest at a rate of up 32 times per second. This makes the observation of chemical reactions and processes more quickly and accurately. The term spectroscopy Fourier transform infrared (FTIR) originates in the fact that a Fourier transform (a mathematical algorithm) is needed to convert raw data into real spectrum. The diffuse reflectance (DRS) is present when the spectrum is based on adsorption phenomena and scattering that occur when analyzing samples such as powders strongly dispersing. DRS is a technique that measures surface and also reflect the composition os the whole. However, it can be used to study the surface if a phase is deposited on a substrate to give us a spectrum in the same region. The technique is suitable for studying surfaces by FTIR-ATR. The main objective of this project is the development of infrared point of attachment to the FTIR-DRS analysis and its application to ceramic powders. To accomplish this objective study the manuals provided by the provider of equipment and will be an accessory use scheme for the infrared spectrometer, At the same time will seek information on the last lines of investigation and search optimization trials. For the set up was used ceramic powders (SiC, B4C… of different grain sizes), evaluating the spectra obtained. There will be a comparison of our results with spectra obtained by other means of infrared spectroscopy to verify the validity of our assays and deviations from them. Finally, experimental results may draw conclusions that applied to open a wide field of possibilities and applications to various industrial processes.
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Keywords
Espectroscopia de infrarrojos, Pulvimetalurgia, Cerámica industrial, Algoritmos matemáticos