Adsorption – desorption kinetics of water vapor on hydroxyapatite/glass/carbon fiber biocomposites
DOI:
https://doi.org/10.15407/hftp17.01.027Keywords:
hydroxyapatite, glass, carbon fibers, adsorption, specific surface area, morphology, thermal stabilityAbstract
The important task of medical materials science is to create multifunctional materials, particularly, materials for bone replacement with improved adsorption properties to load them with drugs for their direct local action in an area of the lesion. In this regard, the aim of work is to study the kinetics of adsorption-desorption of water vapor on biogenic hydroxyapatite/glass/carbon fiber (BHA/glass/CF) composites depending on the content of the fiber component, as well as to study their specific surface area, morphology, and thermal stability. The study allows for the prediction of the behavior of composites during their storage and further use as medical materials.
Microstructural studies were performed by scanning electron microscopy (SEM). The specific surface area of the materials was determined by gas adsorption (Brunauer-Emmett-Teller theory, BET). The kinetics of adsorption and desorption of water vapor were studied using the gravimetric method of analysis. Thermal analysis (TG-DTA) was performed in air within a temperature range from 20 to 1000 °C.
The TG-DTA method of the starting materials and the obtained composites confirmed that the technology used for their preparation allows for keeping carbon fibers in the structure. The SEM studies demonstrated a complex specific porous structure of the obtained BGA/glass/СF biocomposites with the presence of visible carbon fibers in their structure. It has been found that the specific surface area of the composites can be varied from 101 to 537 m2/g by changing the carbon fiber content from 10 to 50 %. It has been shown that biocomposites’ adsorption properties also depend on the carbon fibers’ content. According to a 24-hour study of the adsorption process, it was found that the value of the reduced adsorbed mass of water molecules increases from 0.0392 to 0.162 with an increase in the carbon fiber content from 10 to 50 %. It was shown that the desorption process is a linear function of temperature and depends on an increase in the rate of temperature increase.
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Copyright (c) 2026 O.R. Parkhomey, V.D. Klipov, V.S. Zenkov, O.Ye. Sych, N.D. Pinchuk, V.G. Kolesnichenko

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