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Structural characterization of solid trivalent metal dodecyl sulfates: from aqueous solution to lamellar superstructures

Content Provider	Royal Society of Chemistry (RSC)
Author	Carvalho, Rui A. Valente, Artur J. M. Bermudez, Verónica de Zea Pereira, Rui F. P. Castro, Ricardo A. E. Burrows, Hugh D.
Copyright Year	2013
Abstract	Metal dodecyl sulfates of trivalent aluminium, chromium, lanthanum and gadolinium were prepared by addition of the corresponding salts to aqueous solutions of sodium dodecyl sulfate at the natural pH (ca. 6). Using X-ray diffraction, FT-IR and NMR spectroscopy, DSC, thermogravimetry and polarizing light thermomicroscopy it is shown that metal dodecyl sulfates are formed with lamellar structures. These have different degrees of hydration, which depend upon the metal ion. In some cases there is evidence for coexistence of different lamellar phases. The metal is strongly bound electrostatically to the sulfate group, and although the alkyl chain is in an extended conformation, there are suggestions of local disordering of the methylene groups adjacent to the anionic head group. SEM with an EDS probe on the trivalent metal complexes shows a 1 : 3 ratio at the surface identical to the bulk structure. Studies by SEM and AFM provide evidence of periodicity, which is likely to be induced by the lamellar, layered structures. Differences are observed in the thermal behavior, which appear to reflect both the coordination behavior of the metal ion and the degree of hydration.
Starting Page	1420
Ending Page	1433
Page Count	14
File Format	HTM / HTML PDF
ISSN	20462069
Volume Number	3
Issue Number	5
Journal	RSC Advances
DOI	10.1039/c2ra21906a
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Methylene bridge Dodecane Thermogravimetric analysis Gadolinium Ion Aluminium Fourier-transform infrared spectroscopy Sodium dodecyl sulfate X-ray crystallography DSC Alkyl Chromium Conformational isomerism Lanthanum Nuclear magnetic resonance Sulfate
Content Type	Text
Resource Type	Article
Subject	Chemistry Chemical Engineering

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