Thistlethwaite, P.J., Gee, M.L., and Wilson, David (1996) Diffuse reflectance infrared fourier transform spectroscopic studies of the adsorption of oleate/oleic acid onto zirconia. Langmuir, 12 (26). pp. 6487-6491.

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Abstract

Diffuse reflectance infrared Fourier transform (DRIFT) spectroscopy is used to characterize the adsorbed species when zirconia is exposed to aqueous oleate and oleic acid over a range of pH. The results show that, at pH 9, both oleate anions and oleic acid dimer are adsorbed. The adsorption of oleate anions at a pH where the surface is negatively charged contravenes expectations based on simple electrostatics and indicates another driving force for adsorption, most probably the coordination of oxygen lone pair electrons into zirconium vacant 3d orbitals. At pH 3 both oleate anions and oleic acid monomer are adsorbed with the spectra indicating that H-bonding between C=O groups and surface ZrOH2+ groups contributes to the adsorption of the latter. The intensity distribution in the CH3/CH2 stretch bands of oleate/oleic acid adsorbed at pH 3 differs from that in pure oleic acid. This is tentatively attributed to interactions between the hydrocarbon tails and the protonated surface.

Item ID:	39018
Item Type:	Article (Research - C1)
ISSN:	1520-5827
Date Deposited:	03 Dec 2015 05:18
FoR Codes:	03 CHEMICAL SCIENCES > 0306 Physical Chemistry (incl Structural) > 030606 Structural Chemistry and Spectroscopy @ 50% 03 CHEMICAL SCIENCES > 0306 Physical Chemistry (incl Structural) > 030603 Colloid and Surface Chemistry @ 50%
SEO Codes:	97 EXPANDING KNOWLEDGE > 970103 Expanding Knowledge in the Chemical Sciences @ 100%
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