Modeling of alkyl quaternary ammonium cations intercalated into montmorillonite lattice

Journal Article · Wed May 15 04:00:00 EDT 2013 · Materials Research Bulletin

DOI:https://doi.org/10.1016/J.MATERRESBULL.2013.01.026· OSTI ID:22290424

Daoudi, El Mehdi; Boughaleb, Yahia; El Gaini, Layla ^[1]; Meghea, Irina ^[2]; Bakasse, Mina ^[1]

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1. Faculty of Science, University Chouaib Doukkali, 24000 El Jadida (Morocco)
2. University POLITEHNICA of Bucharest (Romania)

Highlights: ► The modification of montmorillonites by three surfactants increases the basal spacing. ► The model proposed show a bilayer conformation for the surfactant ODTMA. ► The DODMA and TOMA surfactants adopt a paraffin type arrangement. ► Behavior of surfactants in interlayer space was confirmed by TGA and ATR analysis. - Abstract: The objective of this work was to study the conformation of the quaternary ammonium cations viz., octadecyl trimethyl ammonium (ODTMA), dioctadecyl dimethyl ammonium (DMDOA) and trioctadecyl methyl ammonium (TOMA) intercalated within montmorillonite. The modified montmorillonite was characterized by X-ray diffraction in small angle (SAXS), thermal analysis (TGA) and infrared spectroscopy of attenuated total reflection (ATR). The modification of organophilic montmorillonites by the three surfactants ODTMA, DMDOA and TOMA increases the basal spacing from their respective intercalated distances of 1.9 nm, 2.6 nm and 3.4 nm respectively. The increase in the spacing due to the basic organic modification was confirmed by the results of thermal analysis (TGA) and infrared spectroscopy (ATR), and also supported by theoretical calculations of longitudinal and transversal chain sizes of these alkyl quaternary ammonium cations.

• OSTI ID: 22290424
• Journal Information: Materials Research Bulletin, Journal Name: Materials Research Bulletin Journal Issue: 5 Vol. 48; ISSN MRBUAC; ISSN 0025-5408
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ABSORPTION SPECTROSCOPY
CATIONS
INFRARED SPECTRA
LAYERS
MONTMORILLONITE
PARAFFIN
SMALL ANGLE SCATTERING
SURFACTANTS
THERMAL GRAVIMETRIC ANALYSIS
X-RAY DIFFRACTION