| Date |
Topic |
| Archived |
Introduction to Thermal Analysis for Materials Characterization
Thermal Analysis defines a group of analytical techniques which are used to determine physical properties of materials as a function of temperature. Most products which are exposed to temperature changes during their lifetime are characterized by Thermal Analysis.
The presentation will show examples for the usage of
- DSC for measuring heat flow into and from a sample
- TGA for measuring mass loss or gain due to decomposition or evolution of volatiles
- TMA for assessing dimensional properties of materials
- DMA for measuring viscoelastic characteristics of materials
|
| Archived |
Thermal Analysis of Biodegradable Material - From Modulated Temperature DSC to HyperDSC™
Some natural materials are being studied as green alternative to synthetic plastics. One of them is wheat gluten. Thermal analysis has beed used to characterize wheat gluten based material. Thermogravimetry TGA allows to determine the water content and the degradation temperature of wheat gluten which are important factors to consider for processing. Conventional DSC, StepScan DSC and HyperDSC are used to compare the detection capability of the glass transition of wheat gluten protein which is often plasticized by moisture.
The study of a wheat gluten/additive system confirms that the protein structure can be modified by the additive. |
| Archived |
Characterization of Architectural and Safety Glass using UV/Vis/NIR and FT-IR Spectroscopy
Many important parameters of architectural and safety glass must be quickly and accurately measured, to ensure correct performance in use. Testing methods must be rapid, precise and non-destructive.
The use of UV/Vis/NIR Spectroscopy is well-established in glass analysis. The correct choice of instrumentation and sampling accessory is discussed for a range of different sample types, along with the experimental requirements for key measurements and testing protocols. For protection glass, parameters such as UV, Visible, Near-IR and luminous transmittance and relative visual attenuation are discussed, and for single, double and triple-glazed architectural glass, methods for the reflectance and transmittance properties of thin-film coatings are described. New legislation requires accurate measurement of the emissivity of coated, tempered architectural glass in order to determine the thermal insulation characteristics of the window, and we describe the new FT-IR accessories and testing methods which are now available. |
| Archived |
Best Practices in UV/Vis/NIR Specular Reflectance Measurements on Optics and Optical Coatings
UV/Vis/NIR Specular reflectance is among the most important and useful techniques for characterizing optical samples such as laser mirrors, anti-reflection coatings and beamsplitters. We will discuss criteria involved in selection of the most appropriate accessory depending on the measurement angles, the sample size and type and the desired accuracy. The principles of relative and absolute reflectance measurements are discussed, along with sample preparation tips to obtain the best results. We discuss how and when to use polarizers, along with a considerations of how to obtain the highest possible experimental accuracy. Additionally we discuss the use of FT-IR Spectroscopy for the characterization of optical materials. |
| Archived |
Understanding materials on the microscale using FT-IR Imaging technology
ATR FT-IR imaging with germanium crystals offers the potential for acquiring infrared spectral images at up to four times higher spatial resolution than is possible using conventional reflectance or transmission imaging. This technology enables users to have easy spectroscopic access to difficult samples which are hard to image in transmission or reflection, or which have confusing depth structure. The technical aspects and example applications (human hair, pharmaceuticals and polymers) of FT-IR ATR imaging will be presented. |
« Back to PerkinElmer Application Online Seminar Series
|