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Alkyl ammonium intercalation of Mozambican bentonite
AbstractOrgano-bentonites containing quaternary ammonium surfactants were prepared using purified bentonite from the Boane deposit in Mozambique. The intercalation was effected by intimate mixing of the surfactants into a concentrated dispersion of soda ash activated bentonite. TG indicated organic contents that exceeded CEC expectations by up to 21mass %. XRD results were consistent with: (i) paraffin-type extended chain intercalation at tilt angles of 27° to 33°; and (ii) interdigitated monolayer intercalation of the C14 single alkyl chain surfactant and bilayer intercalation of the C16 double alkyl chains and its 1:1 mixture with the single chain surfactant. However, FTIR analysis revealed disordered alkyl chain conformations. White oil dispersions containing 10mass % organo-bentonite (inorganic basis) featured high viscosities. They showed strong shear thinning behaviour confirming the ability of the montmorillonite particles to exfoliate.
Alkyl ammonium intercalation of Mozambican bentonite
AbstractOrgano-bentonites containing quaternary ammonium surfactants were prepared using purified bentonite from the Boane deposit in Mozambique. The intercalation was effected by intimate mixing of the surfactants into a concentrated dispersion of soda ash activated bentonite. TG indicated organic contents that exceeded CEC expectations by up to 21mass %. XRD results were consistent with: (i) paraffin-type extended chain intercalation at tilt angles of 27° to 33°; and (ii) interdigitated monolayer intercalation of the C14 single alkyl chain surfactant and bilayer intercalation of the C16 double alkyl chains and its 1:1 mixture with the single chain surfactant. However, FTIR analysis revealed disordered alkyl chain conformations. White oil dispersions containing 10mass % organo-bentonite (inorganic basis) featured high viscosities. They showed strong shear thinning behaviour confirming the ability of the montmorillonite particles to exfoliate.
Alkyl ammonium intercalation of Mozambican bentonite
Massinga, Pedro H. Jr. (Autor:in) / Focke, Walter W. (Autor:in) / de Vaal, Phillip L. (Autor:in) / Atanasova, Maria (Autor:in)
Applied Clay Science ; 49 ; 142-148
28.04.2010
7 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
Alkyl ammonium intercalation of Mozambican bentonite
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