Inverse Gas Chromatography-Surface Energy Analyzer (iGC-SEA)
Description
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.
Key Differences
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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
Acid/base interactions
Phase transitions
Sorption isotherms
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:
Pharmaceuticals
Cosmetics and Personal Care Products
Food Products and Ingredients
Minerals and Coals
Building Materials
Flavourings and Perfumes
Natural and Artificial Fibres
Biopolymers
Coatings and Thin Films
Supported Catalysts
Polymers, Fillers and Composites
Microporous Materials
Technical Specification
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