Characterization of Surface Properties Using Inverse Gas Chromatography

Characterization of surface properties via inverse gas chromatography (IGC) has become an indispensable tool for probing the physicochemical interactions of solid materials. By injecting vapour-phase probe molecules into a column packed with the material of interest, IGC yields precise measurements of retention volumes, from which dispersive and polar surface energies, as well as acid–base constants, can be derived. Advances in thermal modelling and improved understanding of probe cross-sectional areas have refined the quantification of London dispersion and specific interactions. The technique has been applied across a broad array of substrates—from inorganic catalysts and metal oxides to polymers and carbonaceous fibres—enabling insights into adhesion, coating performance, adsorption phenomena and interface compatibility. Recent methodological innovations address previous inconsistencies by incorporating temperature-dependent models, more accurate molecular area estimations and robust regression approaches, thereby delivering reproducible and comparable surface energy parameters. Such developments not only deepen fundamental knowledge of surface thermodynamics but also guide the design of materials for catalysis, composite interfaces, 3D printing and environmental applications.

Research from Nature Portfolio

Recent studies have employed IGC at infinite dilution to elucidate the thermodynamic surface properties of supported catalysts. One investigation examined H-β-zeolite-supported rhodium catalysts across a range of metal loadings and temperatures. By testing multiple models for alkane probe surface areas, researchers revealed significant deviations in the dispersive surface energy determined via classical and new approaches, and uncovered a non-linear relationship with specific surface area. The study further demonstrated pronounced amphoteric behaviour—balanced acidic and basic interactions—with Lewis constants finely tuned by catalyst composition. A novel regression framework based on linear free-energy models provided acid–base constants with near-ideal correlation, overcoming irregularities of traditional methods. These insights improve the precision of surface characterisation for heterogeneous catalysts and inform optimisation of catalytic interfaces.

Characterization of Surface Properties Using Inverse Gas Chromatography publication trend

The graph below shows the total number of articles in characterization of surface properties using inverse gas chromatography across all publications each year (not limited to Nature Index journals).

Technical terms

Inverse gas chromatography (IGC): A physicochemical technique in which probe molecules are passed over a solid sample to measure retention and derive surface interaction energies.

Dispersive surface energy: Component of surface free energy arising from non-polar van der Waals interactions between the surface and probe molecules.

Polar surface energy: Portion of surface free energy associated with polar interactions such as dipole–dipole and hydrogen bonding forces.

Lewis acid–base properties: Quantitative measures of a surface’s electron-accepting (acidic) and electron-donating (basic) sites determined via probe adsorption.

Net retention volume: Corrected volume of carrier gas required to elute a probe molecule from the sample, used to calculate surface interaction parameters.

References

1. Inverse Gas Chromatography to Characterize the Surface Properties of Solid Materials. Chemistry of Materials (2024).
2. New approach to determine the surface and interface thermodynamic properties of H-β-zeolite/rhodium catalysts by inverse gas chromatography at infinite dilution. Scientific Reports (2020).
3. New Progress on London Dispersive Energy, Polar Surface Interactions, and Lewis’s Acid–Base Properties of Solid Surfaces. Molecules (2024).
4. New Advances on the Dispersive and Polar Surface Properties of Poly(styrene-co-butadiene) Using Inverse Gas Chromatography. Polymers (2024).
5. Determination of Hydrophobic Dispersive Surface Free Energy of Activated Carbon Fibers Measured by Inverse Gas Chromatographic Technique. Nanomaterials (2023).