Special Issues-08-01-2012

Special Issues

FT-IR Search Algorithm – Assessing the Quality of a Match

August 01, 2012

Articles

27

8

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.

Infrared Specular Reflection Calculated for Polymer Films on Polymer Substrates: Models for the Spectra of Coated Plastics

August 01, 2012

Articles

27

8

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.

Infrared Analysis of Self Assembled Monolayers

August 01, 2012

Articles

27

8

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.

Sample Preparation - Free Micro ATR FT-IR Chemical Imaging of Polymers and Polymer Laminates

August 01, 2012

Articles

27

8

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.

Vol 27 No 8 Spectroscopy August 2012 Regular Issue PDF

August 01, 2012

Issue PDF

27

8

Click the title above to open the Spectroscopy August 2012 regular issue, Vol 27 No 8, in an interactive PDF format.