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Intercalation of vermiculite in presence of surfactants
AbstractVermiculite was modified with surfactants in order to enable intercalation of vermiculite layers. Since vermiculite has negative charges on its surfaces, it was expected that cationic surfactant would expand the clay mineral layers more than an anionic surfactant. Nevertheless, negative parts of the anionic surfactants interacted with the positively charged edges of vermiculite and caused to super lattice structure so, unexpectedly the expansion of the layers was determined to be fully collapsed phase of vermiculite. Colloidal and structural properties of vermiculite dispersions were examined in presence of anionic, cationic and nonionic surfactants. The results showed that cationic surfactant covered the surface of the vermiculite with a second layer but the expansion of the clay mineral layer was limited compared to the anionic surfactant. The anionic surfactant produced electrostatic interaction with the positively charged edges of vermiculite and fully expanded the layer structure of the vermiculite.
Graphical abstract
HighlightsCharacteristic properties of Vermiculite, including the flow propertiesEffect of cationic, anionic and nonionic surfactants to the colloidal and structural properties of vermiculiteFully collapsed structure of vermiculite in presence of anionic surfactantThe success of the anionic surfactant to open the interlayers of vermiculite more than cationic surfactants
Intercalation of vermiculite in presence of surfactants
AbstractVermiculite was modified with surfactants in order to enable intercalation of vermiculite layers. Since vermiculite has negative charges on its surfaces, it was expected that cationic surfactant would expand the clay mineral layers more than an anionic surfactant. Nevertheless, negative parts of the anionic surfactants interacted with the positively charged edges of vermiculite and caused to super lattice structure so, unexpectedly the expansion of the layers was determined to be fully collapsed phase of vermiculite. Colloidal and structural properties of vermiculite dispersions were examined in presence of anionic, cationic and nonionic surfactants. The results showed that cationic surfactant covered the surface of the vermiculite with a second layer but the expansion of the clay mineral layer was limited compared to the anionic surfactant. The anionic surfactant produced electrostatic interaction with the positively charged edges of vermiculite and fully expanded the layer structure of the vermiculite.
Graphical abstract
HighlightsCharacteristic properties of Vermiculite, including the flow propertiesEffect of cationic, anionic and nonionic surfactants to the colloidal and structural properties of vermiculiteFully collapsed structure of vermiculite in presence of anionic surfactantThe success of the anionic surfactant to open the interlayers of vermiculite more than cationic surfactants
Intercalation of vermiculite in presence of surfactants
İşçi, Sevim (author)
Applied Clay Science ; 146 ; 7-13
2017-05-24
7 pages
Article (Journal)
Electronic Resource
English
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