Inverse Gas Chromatography-Surface Energy Analyzer (iGC-SEA)
Surface Measurement Systems
The iGC-SEA continues Surface Measurement Systems’ pioneering history with inverse gas chromatography (iGC), which now spans more than fifteen years.
The iGC-SEA is a second generation iGC instrument. It is the world’s only commercial instrument based on the iGC principle. The unique SMS injection scheme provides a wide range of injection concentrations with unrivalled accuracy and reproducibility.
How does the iGC-SEA work?
The iGC-SEA is based on Inverse Gas Chromatography (iGC) methodology and is a gas phase technique for characterising surface and bulk properties of solid materials. The principles of IGC are very simple, being the reverse of a conventional gas chromatographic (GC) experiment.A cylindrical column is uniformly packed with the solid material of interest, typically a powder, fibre or film. A pulse of constant concentration of gas is then injected down the column at a fixed carrier gas flow rate, and the time taken for the pulse or concentration front to elute down the column is measured by a detector. A series of iGC measurements with different gas phase probe molecules then allows access to a wide range of phyisco-chemical properties of the solid sample.
The injected gas molecules passing over the material adsorb on the surface with a partition coefficient KS:
Ks = Vn / Ws
Where VN is the net retention volume – the volume of carrier gas required to elute the injection through the column, and WS is the mass of the sample. VN is a measure of how strongly the probe gas interacts with the solid sample and is the fundamental data obtained from an IGC experiment; from it a wide range of surface and bulk properties can be calculated.
Instrument features include:
Unrivalled accuracy and repeatability
Fully automated operation
Comprehensive data analysis software
Up to 12 different probe gas molecules
User friendly wizard based software
Optional humidity control
In-Situ sample pre-conditioning
Wide temperature range
Column packing accessory
The iGC-SEA provides unique access to the following physico-chemical properties of a wide range of solid materials in a controlled humidity environment:
Dispersive and polar surface energies
Heats and entropies of adsorption
Permeability, solubility and diffusion
Micropore and mesopore distributions
Competitive (Multicomponent) adsorption
Surface energy heterogeneity mapping
Typical iGC-SEA Applications – iGC-SEA provides access to unique physicochemical information for:
Cosmetics and Personal Care Products
Food Products and Ingredients
Minerals and Coals
Flavourings and Perfumes
Natural and Artificial Fibres
Coatings and Thin Films
Polymers, Fillers and Composites