Characterisation of microporous materials by dynamic sorption methods

Thermodynamics of binary gas adsorption in nanopores

“…Since its introduction in the 90's, 42 isothermal dynamic vapour sorption methods have been extensively used in a very wide range of scientific fields, including pharmaceutical, 43 food 44 or materials science, 45 as well as chemical sensor applications. 46 In the present study, the adsorption of the binary gas mixture of TBA and toluene was carried out using the VTI-SA+ Vapour Sorption apparatus from TA instruments.…”

Metal-Organic Frameworks Characterization via Inverse Pulse Gas Chromatography

“…IGC experiments can be carried out under two different conditions: infinite dilution and finite concentration. Infinite dilution has been identified as appropriate for the heat of sorption and surface energy examination of particles [39]. Infinite dilution at low surface coverage indicates a minimal amount of the tested probe molecule is injected.…”

Some Irregularities in the Evaluation of Surface Parameters of Solid Materials by Inverse Gas Chromatography

“…Inverse gas chromatography (IGC) at infinite dilution can be considered a surface technique that gives interesting information on the surface thermodynamic properties of materials and nanomaterials, such as the dispersive surface energy, the specific free energy of adsorption, and the Lewis acid–base constants. − The determination of these surface properties is very important to understand the behavior of materials during chemical synthesis, process engineering, wettability, adsorption, diffusion, evaporation, food technology, biomaterials, and pharmaceuticals. The dispersive surface energy and the specific properties of many solid particles were characterized by using IGC, such as oxides, metals, − ceramic materials, and other solid substrates and nanostructures. − The Lewis acid base constants of solid surfaces − can be also determined by IGC from the determination of the specific variables. The dispersive surface energy of solid particles calculated by Dorris–Gray from the Fowkes relation was correlated to the work of adhesion W a and the free energy of adsorption Δ G a 0 by relation : Δ G a 0 = N a W a = 2 N a γ l d γ s d Where a is the surface area of adsorbed molecule, γ l d the dispersive component of the liquid solvent γ l d , and scriptN Avogadro’s number.…”