ESPECTROSCOPIA INFRARROJA TRANSFORMADA FOURIER PDF

Fourier-transform infrared spectroscopy FTIR [1] is a technique used to obtain an infrared spectrum of absorption or emission of a solid, liquid or gas. An FTIR spectrometer simultaneously collects high-spectral-resolution data over a wide spectral range. This confers a significant advantage over a dispersive spectrometer, which measures intensity over a narrow range of wavelengths at a time. The term Fourier-transform infrared spectroscopy originates from the fact that a Fourier transform a mathematical process is required to convert the raw data into the actual spectrum. The most straightforward way to do this, the "dispersive spectroscopy" technique, is to shine a monochromatic light beam at a sample, measure how much of the light is absorbed, and repeat for each different wavelength.

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ISSN This work consists of a literature review on the use of Fourier Transform Infrared Spectroscopy FTIR as a possible technique to study the hydration of cement. We compared studies in which we studied the hydration of different pastes at early ages. It was also analyzed the growth of the hydration products when the cement is mixed with water.

Cement pastes used in two of the works are modified with polymers, which can be seen by the delay in growth of one of the hydration products calcium hydroxide in time by action of the polymers within the cement matrix.

Major peaks are: calcium hydroxide, gypsum, hydrated calcium silicate, calcium carbonate and the ettringite. The peak at cm -1 corresponding to calcium hydroxide Ca OH 2 , which is formed while the silicate phases are dissolved. The gypsum generates a peak at cm The peaks at , , , and cm -1 were due to calcium carbonate. The carbonates occur for wavenumbers cm -1 , cm -1 and cm In the range of cm -1 was observed an increase of calcium silicate hydrate CSH as hydration occurs.

Peaks were detected at cm -1 after hydration, which points to the early formation of ettringite. All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License.

Services on Demand Journal. Similars in SciELO. Keywords : infrared spectroscopy; cement hydration. How to cite this article.

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Fourier-transform infrared spectroscopy

Skip to search form Skip to main content You are currently offline. Some features of the site may not work correctly. Resumen: El objetivo del presente trabajo es poner de manifiesto la importancia adquirida por la espectroscopia del infrarrojo medio, especialmente empleando la transformada de Fourier, durante los ultimos anos en el campo de la quimica analitica de procesos, centrandonos en el control medioambiental y alimentario. Palabras clave: Espectroscopia infrarrojo medio, transformada de Fourier, quimica analitica de procesos, control medioambiental, control alimentario, revision. Save to Library. Create Alert. Launch Research Feed.

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