Surface of Dispersed Clay Materials: Physicochemical and Acid-base Properties
Experimentally determined are the mineral composition, surface morphology, dispersion and unique surface of dispersed clay fillers of varying chemical nature. Natural clay dispersion fillers are commonly used in various applications in the production of modern polymer composites and other composite materials. Clay mineral disperses fillers of different chemical and mineral compositions used as testing materials: bentonite clay, kaolinite clay and diabase flour. The structure of the hydroxyl-hydrated surface layer of the filler surface was analyzed using thermogravimetric (TG) analysis and differential thermal analysis (DTA). Using pK-metric and pH-metric methods, the volume and acidity of the surface active centers of clay fillers have been investigated. It was known that the mineral composition is the deciding factor in the acid-base surface properties of clay fillers. The thickness, at such large scales, of the hydroxyl-hydrated surface layer influences the surface acidity. It has been shown that clay fillers are distinguished by greater acidity than the fillers that consist of kaolinite, including montmorillonite as the dominant minerals. The acid-base properties of the surface are dependent on the chemical composition of the impurities and associated minerals in the mixed clay fillers.
Author (s) Details
Department of General Chemistry, Kharkiv National University of Civil Engineering and Architecture, Sumska Str., 40, 61002, Kharkiv, Ukraine.
National University of Civil Protection of Ukraine, Research Center, Chernyshevska str., 94, 61023, Kharkiv, Ukraine.
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