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Formation of organo-highly charged mica

AuthorsAlba, María D. ; Orta, M. Mar ; Castro Arroyo, Miguel Ángel ; Pavón, Esperanza ; Pazos, M. Carolina ; Valencia Rios, J. S.
Issue Date2011
PublisherAmerican Chemical Society
CitationLangmuir : the ACS journal of surfaces and colloids 27: 9711- 9718 (2011)
AbstractThe interlayer space of the highly charged synthetic Na-Mica-4 can be modified by ion-exchange reactions involving the exchange of inorganic Na + cations by surfactant molecules, which results in the formation of an organophilic interlayer space. The swelling and structural properties of this highly charged mica upon intercalation with n-alkylammonium (RNH 3)+ cations with varying alkyl chain lengths (R = C12, C14, C16, and C18) have been reported. The stability, fine structure, and evolution of gaseous species from alkylammonium Mica-4 are investigated in detail by conventional thermogravimetric analysis (TGA), Fourier transform infrared spectroscopy (FTIR), in situ X-ray diffraction (XRD), and solid-state nuclear magnetic resonance (MAS NMR) techniques. The results clearly show the total adsorption of n-alkylammonium cations in the interlayer space which expands as needed to accommodate intercalated surfactants. The surfactant packing is quite ordered at room temperature, mainly involving a paraffin-type bilayer with an all-trans conformation, in agreement with the high density of the organic compounds in the interlayer space. At temperatures above 160 °C, the surfactant molecules undergo a transformation that leads to a liquid-like conformation, which results in a more disordered phase and expansion of the interlayer space. © 2011 American Chemical Society.
Identifiersdoi: 10.1021/la200942u
issn: 0743-7463
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