FT-IR Spectroscopy

Feb 01, 2013
Spectroscopy
Polystyrene film is useful for routine checking of FT-IR spectrometer performance, but variations in film thickness and scattering can cause large variations in the results.
Oct 16, 2012
Wavelength
By Spectroscopy Editors
Click here to view the complete Wavelength newsletter from October 16, 2012.
Sep 14, 2012
Wavelength
By Spectroscopy Editors
The well-established technique of Fourier transform infrared (FT-IR) spectroscopy offers analytical capabilities for diverse applications, and chemometrics and spectral interpretation software are important elements of the technique.
Aug 01, 2012
Special Issues
The micro attenuated total reflectance (ATR) chemical imaging of polymers, in particular polymer laminates, typically requires significant pressure to ensure good sample-to-ATR crystal contact. For thin cross-sectioned materials, ensuring structural rigidity against this pressure requires significant sample preparation, such as resin embedding, cutting, and polishing.
Aug 01, 2012
Special Issues
Self-assembled monolayers (SAMs) can be applied in a variety of technical areas. Infrared characterization of these materials is a challenge because of the low concentrations on the surfaces. This article reviews the sampling methods for characterization and presents data comparing the different approaches.
Aug 01, 2012
Special Issues
Infrared reflection spectroscopy is a tool that can be used to study coated plastics, but the spectra can show unexpected features. In this report, we calculate the specular reflectance for a flat surface of two different polymers as well as how their spectra change when the other polymer is added as a film with a thickness of up to 2.5 ?m. One of the unusual phenomena we observe is that "derivative"-shaped substrate bands invert in sign as the other polymer is added as a coating. We also show how the reflection of the surface changes and becomes polarized as the angle of incidence increases.
Aug 01, 2012
Special Issues
The beginning of the age of Fourier transform infrared (FT-IR) spectroscopy meant the availability of digital spectra and opened the possibility of using computers to compare a single spectrum against a reference database containing thousands of spectra, thereby allowing enormous efficiency gains in the comparison of unknown spectra to reference materials. Various algorithms can be used to create a hit quality index (HQI), which is a measure of how well the query spectrum compares against each reference spectrum.
Jun 18, 2012
Spectroscopy
By Spectroscopy Editors
Bernhard Lendl and Cosima Koch of the Vienna University of Technology have developed a new method for on-line monitoring of fermentations using mid-infrared spectroscopy.
May 11, 2012
Spectroscopy
By Spectroscopy Editors
Part of a new podcast series presented in collaboration with the Federation of Analytical Chemistry and Spectroscopy Societies (FACSS), in connection with SciX 2012 ? the Great Scientific Exchange, the North American conference (39th Annual) of FACSS.
Dec 01, 2011
Spectroscopy
Case studies involving fouling and product quality illustrate the effective use of this method.
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