Acid-basic surface properties of clay disperse fillers

The mineral composition, surface morphology, dispersion and specific surface of dispersed clay fillers of various chemical nature have been experimentally determined. As materials for research used clay mineral disperse fillers of various chemical and mineral composition: bentonite clay, kaolinite c...

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Bibliographic Details
Published in:	MATEC web of conferences Vol. 230; p. 3004
Main Authors:	Danchenko, Yuliya, Andronov, Vladimir, Sopov, Viktor, Khmyrov, Igor, Khryapynskyy, Anton
Format:	Journal Article Conference Proceeding
Language:	English
Published:	Les Ulis EDP Sciences 01-01-2018
Subjects:	Bentonite Chemical composition Clay minerals Differential thermal analysis Differential thermogravimetric analysis Dispersion Fillers Kaolinite Montmorillonite Morphology Properties (attributes) Surface layers Surface properties
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Summary:	The mineral composition, surface morphology, dispersion and specific surface of dispersed clay fillers of various chemical nature have been experimentally determined. As materials for research used clay mineral disperse fillers of various chemical and mineral composition: bentonite clay, kaolinite clay and diabase flour. Using the thermogravimetric (TG) analysis and the differential thermal analysis (DTA), the structure of the hydroxyl-hydrated surface layer of the filler surface has been studied. The amount and acidity of the surface active centers of clay fillers have been investigated using pK-metric and pH-metric methods. It was established that the mineral composition is the determining factor in the acid-base surface properties of clay fillers. The thickness of the hydroxyl-hydrated surface layer affects the acidity of the surface, at certain large sizes. It has been shown that clay fillers, which include montmorillonite as the dominant minerals, are characterized by higher acidity than the fillers that consist of kaolinite. In the mixed clay fillers, the acid-base properties of the surface depend on the chemical nature of the impurities and related minerals.
ISSN:	2261-236X 2274-7214 2261-236X
DOI:	10.1051/matecconf/201823003004