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The surface properties of clay minerals modified by intensive dry milling — revisited

Vdović, Neda; Jurina, Irena; Škapin, Srečo D.; Sondi, Ivan (2010) The surface properties of clay minerals modified by intensive dry milling — revisited. Applied clay science, 48 (4). pp. 575-580. ISSN 0169-1317

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Abstract

The present study broadens the research on the effect of the intensive physical disintegration of clays (kaolinite and “Otay” montmorillonite) and mica (ripidolite) minerals, carried out by high-energy ball milling (HEBM), on their surface physico-chemical characteristics, i.e., the specific surface area (SSA), the cation exchange capacity (CEC), and the electrokinetic properties. It has been shown that the mechanical disintegration of clays occurs in two consecutive processes: in significant changes to the size, morphology and structure of the phyllosilicate solids, followed by the alteration of their physico-chemical properties. The initial particle size diminution of clays resulted in significant increases in the SSA and CEC values, and in the exposure of new, amphoteric surfaces to the experimental environment, significantly changing their electrophoretic mobilities (EPM). Prolonged milling produces amorphous alumina-silicate aggregates. These solids exhibited the same morphological properties, SSA and CEC, despite the fact that they were formed from initially different clay minerals, in the sense of their structural, chemical, and surface physico-chemical characteristics. In contrast, the electrophoretic mobilities of these samples have shown altered characteristics, exemplifying the significance of the initial chemical composition and the formation of different types of surface structures on the physico-chemical processes at amorphous solid-surface–liquid interfaces.

Item Type: Article
Uncontrolled Keywords: ball-milling; electrokinetics; kaolinite; montmorillonite; ripidolite; surface characteristics
Subjects: NATURAL SCIENCES > Geology
Divisions: Division for Marine and Enviromental Research
Projects:
Project titleProject leaderProject codeProject type
Nanočestice u biogeokemijskim procesima u okolišuIvan Sondi098-0982934-2742MZOS
Depositing User: Irena Jurina Tokić
Date Deposited: 20 Dec 2016 13:52
Last Modified: 20 Dec 2016 13:52
URI: http://fulir.irb.hr/id/eprint/2195
DOI: 10.1016/j.clay.2010.03.006

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