Application Note 204: Determination of the glass transition temperatures Tg of maltose and its dependence on relative humidity by infinite dilution inverse gas chromatography
The glass transition temperature Tg is an important property for the characterisation of polymeric, food, pharmaceutical and many natural products. iGC-SEA can provide a fast and accurate determination of this property as well as its dependence on relative humidity. This paper describes the characterisation of maltose with decane at infinite dilution. Read on >
Application Note 215: A sorption study microporous materials by infinite dilution inverse gas chromatography
Finite concentration iGC-SEA is a useful tool for the investigation of surface and pore properties. A novel combination of finite concentration iGC-SEA and thermal desorption provides the possibility to separate micropore adsorption from surface and mesopore adsorption. This allows the calculation of BET values with physical relevance for highly microporous materials and the consideration of molecular sieve effects. Read on >
Application Note 216: Characterization of surface properties of glass fibres by inverse gas chromatography
In the present paper dispersive surface energies and specific free energies have been calculated for different modified E-glass fibre surfaces. Both different sizing and different polymer coatings have been investigated to consider changes in the surface chemistry and surface energy during different fibre treatments. Read on >
Application Note 301: An Overview of iGC-SEA – A new instrumental technique for characterizing the physico-chemical properties of pharmaceutical materials.
This application note gives a brief description of the technique, the instrument and some examples of its application within pharmaceutical physic chemical analysis.
The increasing sophistication of pharmaceutical drugs and drug delivery technologies has created the need for new techniques to measure the physic chemical properties of a wide range of solid pharmaceutical ingredients and formulations. Inverse gas chromatography (iGC-SEA) is a gas phase technique, first developed over 40 years ago, to study the surface and bulk properties of particulate and fibrous materials. iGC-SEA has the potential to unlock some of the more difficult to measure physicochemical properties of pharmaceutical materials such as powder surface energies, acid/base/polar functionality of surfaces, diffusion kinetics, solubility parameters, surface heterogeneity and phase transition temperatures/humidities. Read on >
Application Note 303: An Overview – Characterization of strong solid-vapor interactions by inverse gas chromatography.
The surface properties of powders and fibres are important parameters in the handling and performance of a wide range of solid materials. iGC SEA has been specifically designed to address many of the issues faced by physical properties researchers, including fully automated operation and the ability to measure samples in a controlled humidity environment. This Application note gives a brief description of the technique, the instrument and some examples of its application to a range of polymeric materials analysis problems. Read on >