A X-ray photoelectron spectroscopy study of HDTMAB distribution within organoclays
Frost, Ray L., He, Hongping, Zhou, Qin, Kloprogge, J. Theo, Duong, Loc V., & Wood, Barry (2007) A X-ray photoelectron spectroscopy study of HDTMAB distribution within organoclays. Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 66(4-5), pp. 1180-1188.
X-ray photoelectron spectroscopy (XPS) in combination with X-ray diffraction (XRD) and high-resolution thermogravimetric analysis (HRTG) has been used to investigate the surfactant distribution within the organoclays prepared at different surfactant concentrations. This study demonstrates that the surfactant distribution within the organoclays depends strongly on the surfactant loadings. In the organoclays prepared at relative low surfactant concentrations, the surfactant cations mainly locate in the clay interlayer whereas the surfactants occupy both the clay interlayer space and the interparticle pores in the organoclays prepared at high surfactant concentrations. The former adopts a lateral arrangement for the intercalated surfactants within the interlayer while the latter has a paraffin arrangement. This can well explain the dramatic surface area and pore volume decrease of organoclays compared to those of starting clays. XPS survey scans show that, at low surfactant concentration (< 1.0 CEC), the ion exchange between Na+ and HDTMA+ is dominant whereas both cations and ion pairs occur in the organoclays prepared high concentrations (> 1.0CEC). High-resolution XPS spectra show that the modification of clay with surfactants has prominent influences on the binding energies of the atoms in both clays and surfactants, and nitrogen is the most sensitive to the surfactant distribution within the resultant organoclays.
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|Item Type:||Journal Article|
|Keywords:||organoclay, surface chemistry, colloids, nanochemistry, XPS|
|Subjects:||Australian and New Zealand Standard Research Classification > CHEMICAL SCIENCE (030000) > PHYSICAL CHEMISTRY (INCL. STRUCTURAL) (030600) > Colloid and Surface Chemistry (030603)|
|Divisions:||Past > QUT Faculties & Divisions > Faculty of Science and Technology|
|Copyright Owner:||Copyright 2007 Elsevier|
|Copyright Statement:||Reproduced in accordance with the copyright policy of the publisher.|
|Deposited On:||16 Mar 2007|
|Last Modified:||29 Feb 2012 13:34|
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