Structure Formation in Dispersions of Montmorillonite in the Presence of Quaternary Ammonium Salts

The aim is to study the influence of cationic surfactants – quaternary ammonium salts – for structure formation in montmorillonite suspensions by studying the rheological and colloidal-chemical properties of such systems. Relying on x-ray diffraction analysis we identify surfactant molecules close to a parallel position relative to the basal surface of mineral with the interlayer space of 1.6 nm. By using rheometry we obtain flow curves and corresponding values of boundary shear stress for dispersions of montmorillonite in the presence of cationic surfactants. We show the extreme character changes of rheological characteristics of montmorillonite dispersions depending on the concentration of surfactant. Highs in the curves of boundary shear stress on the concentration of surfactant correspond to formation of a continuous mesh between particles with “edge–face” orientation. We demonstrate that the use of cationic surfactants changes the shear stress to maximum (15 Pa) in the concentration of surfactant 1 mmol/dm3, and gradually decreases to almost zero with a further increase surfactant content. These results lay foundation for determining the optimal parameters of porous heterostructures synthesis and regulation of their properties by changing the hydrophilic-hydrophobic balance of source systems.

Publication year: 
2013
Issue: 
3
УДК: 
544.72:547-304.2
С. 140–144. Іл. 2. Бібліогр.: 16 назв.
References: 

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References [transliteration]: 

1. L. Betega de Paiva et al., “Organoclays: Properties, preparation and applications”, Appl. Clay Sci., no. 42, рp. 8–24, 2008.
2. M.S. Auerbach, Handbook of layered materials. UK, London: CRC Press, 2004, 646 p.
3. G. Kickelbick, Hybrid materials: synthesis, characterization, and applications. Weinheim: Wiley-VCH, 2007, 498 p.
4. A. Galarneau et al., “Porous clay heterostructures (PCH) as acid catalysts”, Chem. Com., no. 17, pр. 1661–1662, 1997.
5. H.Y. Zhu et al., “Molecular engineered porous clays using surfactants”, Appl. Clay Sci., no. 20, pp. 165–175, 2002.
6. Shabanova N.A., Sarkisov P.D. Zol'-gel' tekhnologii. Nanodispersnyĭ kremnezem. – M.: BINOM. Laboratorii͡a znaniĭ, 2012. – 328 s.
7. Tarasevich I͡U.I., Ovcharenko F.D. Adsorbt͡sii͡a na glinistykh mineralakh. – K.: Nauk. dumka, 1975. – 352 s.
8. Shramm G. Osnovy prakticheskoĭ reologii i reometrii. – M.: Kolos, 2003. – 312 s.
9. G.W. Brindley and G. Brown, Crystal Structures of Clay Minerals and Their X-Ray Identification. UK, London: Mineral. Soc., 1980, 496 p.
10. Zhu Jianxi et al., “Arrangement models of alkylammonium cations in the interlayer of HDTMA+ pillared montmorillonites”, Chinese Sci. Bull., no. 4, pp. 368–372, 2003.
11. E. Tombácz and M. Szekeres, “Surface charge heterogeneity of kaolinite in aqueous suspension in comparison with montmorillonite”, Appl. Clay Sci., no. 34, pp. 105–124, 2006.
12. P.F. Luckham and S. Rossi, “The colloidal and rheological properties of bentonite suspensions”, Adv. Colloid Interface Sci., vol. 82, pр. 43–92, 1999.
13. M. Janek and G. Lagaly, “Interaction of a cationic surfactant with bentonite: a colloid chemistry study”, Colloid Polym. Sci., vol. 281, pp. 293–301, 2003.
14. D. Penner and G. Lagaly, “Influence of organic and inorganic salts on the coagulation of montmorillonite dispersions”, Clays and Clay Minerals, vol. 48, pр. 246–255, 2000.
15. S. Gürses et al., “Monomer and micellar adsorptions of CTAB onto the clay/water interface”, Desalination, vol. 264, рp. 165 172, 2010.
16. B. Rózycka-Roszak et al., “Hydration of alkylammonium salt micelles - influence of bromide and chloride counterions”, Z. Naturforsch C, no. 55, pр. 1–7, 2000.

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