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

Temperature Dependence of the Polar and Lewis Acid–Base Properties of Poly Methyl Methacrylate Adsorbed on Silica via Inverse Gas Chromatography

“…Several chromatographic methods and models [29,30,[32][33][34][35][36][37][38][39][42][43][44][45][46][47] have been used in the literature to determine the polar contribution ∆G p a . The first separation method of the London dispersive and polar interactions between a solid surface and a polar molecule was proposed by Saint-Flour and Papirer [29,30], using the logarithm of the vapor pressure P 0 of the probes.…”

“…The notion of the deformation polarizability α 0 was proposed by Donnet et al [33], whereas the concept of the topological index χ T was used by Brendlé and Papirer [34,35]. Hamieh criticized the different previous methods and models in several studies [38,39,[42][43][44][45][46][47] by proving the thermal effect on the surface area of molecules and by showing the many difficulties and irregularities encountered when trying to obtain accurate values of the physicochemical parameters of the molecules adsorbed on the solid surfaces. This allowed us to propose a new method based on the London dispersive interaction energy between the solvents and the solid surfaces.…”

Thermal Surface Properties, London Dispersive and Polar Sur-face Energy of Graphene and Carbon Materials by Inverse Gas Chromatography at Infinite Dilution

“…The obtained results of 𝑅𝑇𝑙𝑛𝑉 and the application of the Hamieh thermal model which gave the expressions of the surface area 𝑎 𝑇 and the dispersive surface energy 𝛾 𝑇 of organic molecules as a function of the temperature 𝑇 [22][23][24][25][26], led to the representation of 𝑅𝑇𝑙𝑛𝑉 as a function of 2𝒩𝑎 𝑇 𝛾 / in Figure 1 for graphene and carbon materials. Figure 2 showed that the graphene exhibited the highest 𝛾 𝑇 for all temperatures followed by the reduced graphene oxide, while the lowest 𝛾 𝑇 was obtained in the case of the oxidized carbon fibers.…”

“…However, the results obtained by these authors were based on the hypothesis which considered the surface area and the London dispersive surface energy of the organic molecules as constant parameters. This was failed by several research works [22][23][24][25][26] proving an important variation of the above parameters as a function of the temperature. Lee et al [27] also determined the London dispersive and polar components, and the Lewis acid-base properties of the surface free energy of graphene materials using IGC technique at an infinite dilution at room temperature.…”

“…The lack of information and the different gaps encountered in this research area guided the objective of our study for an accurate determination of the surface properties of graphene and carbon materials which are very required to obtain a real guidance for the design and manufacturing of graphene-based biomaterials, medical instruments, structural composites, electronics, and renewable energy devices [20]. The present work is then devoted to the determination of thermal surface properties, the London dispersive and polar acid-base surface energies, and the Lewis's acid-base parameters of graphene and carbon materials as a function of the temperature by using IGC technique at infinite dilution and applying our new approach based on the Hamieh thermal model [22][23][24][25][26].…”