Hamieh, T. The Effect of Temperature on the Surface Energetic Properties of Carbon Fibers Using Inverse Gas Chromatography. Crystals2024, 14, 28.
Hamieh, T. The Effect of Temperature on the Surface Energetic Properties of Carbon Fibers Using Inverse Gas Chromatography. Crystals 2024, 14, 28.
Hamieh, T. The Effect of Temperature on the Surface Energetic Properties of Carbon Fibers Using Inverse Gas Chromatography. Crystals2024, 14, 28.
Hamieh, T. The Effect of Temperature on the Surface Energetic Properties of Carbon Fibers Using Inverse Gas Chromatography. Crystals 2024, 14, 28.
Abstract
This paper constitutes an original and new methodology for the determination of the surface properties of carbon fibers in the two oxidized and untreated forms by inverse gas chromatography technique at infinite dilution based on the effect of the temperature on the surface area of the various organic molecules adsorbed on the carbon fibers. The studied thermal effect proved a large deviation of the classical methods or models relative to the new determination of the surface properties of carbon fibers, such as the dispersive component of their surface energy, the free surface energy, the free specific energy, the enthalpy and entropy of adsorption of molecules on the carbon fibers. The obtained specific enthalpy and entropy of adsorption for the polar solvents led to the determination of the Lewis’s acid-base constants of carbon fibers. Different molecular models and chromatographic methods were used to quantify the surface thermodynamic properties of carbon fibers and compared to the thermal model. The obtained results proved that the oxidized carbon fibers gave more specific interaction energy and greater acid-base constants than that of the untreated carbon fibers and thus highlighting the important role of the oxidization on the acid-base of fibers. The determination of the specific acid-base surface energy of the two carbon fibers showed greater values of the oxidized carbon fibers relative to the untreated carbon fibers. An important basic character was highlighted for the two studied carbon fibers, larger than the acidic character. It was observed that the Lewis’s acid-base constants of the oxidized carbon fibers are larger than that of the untreated fibers with more accentuated basic charterer. This result was confirmed by all molecular models and chromatographic methods.
Keywords
Dispersive surface energy; specific acid-base surface energy; specific surface enthalpy and entropy of adsorption; Lewis’s acid base enthalpic and entropic constants; thermal effect.
Subject
Chemistry and Materials Science, Materials Science and Technology
Copyright:
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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