Adsorption isotherms of cationic pyridinium surfactants at the solid/liquid interface were obtained on aqueous dispersions of titanium dioxide as a function of the electrification features of the adsorbent. The surfactants, prepared in the laboratory, were a symmetric ‘gemini-like’ dimer (1,1 -bidodecyl-4,4 - bipyridinium chloride) and its related simple monomeric salt (1-dodecyl-4-methylpyridinium chloride). X-ray photoelectron spectroscopy analyses were performed both on the bare adsorbent and in the presence of the adsorbates. The XPS regions of Ti 2p, O 1s, N 1s and C 1s were specifically investigated. The nature of the interactions supporting the adsorption and the molecule orientation/co-area are discussed in the light of the different experimental evidence.
Adsorption of cationic ?gemini? surfactants at the TiO2/solution interface / S. Ardizzone, C.L. Bianchi, P. Quagliotto, G. Viscardi. - In: SURFACE AND INTERFACE ANALYSIS. - ISSN 0142-2421. - 34:1(2002), pp. 652-656. [10.1002/sia.1380]
Adsorption of cationic ?gemini? surfactants at the TiO2/solution interface
S. ArdizzonePrimo
;C.L. BianchiSecondo
;
2002
Abstract
Adsorption isotherms of cationic pyridinium surfactants at the solid/liquid interface were obtained on aqueous dispersions of titanium dioxide as a function of the electrification features of the adsorbent. The surfactants, prepared in the laboratory, were a symmetric ‘gemini-like’ dimer (1,1 -bidodecyl-4,4 - bipyridinium chloride) and its related simple monomeric salt (1-dodecyl-4-methylpyridinium chloride). X-ray photoelectron spectroscopy analyses were performed both on the bare adsorbent and in the presence of the adsorbates. The XPS regions of Ti 2p, O 1s, N 1s and C 1s were specifically investigated. The nature of the interactions supporting the adsorption and the molecule orientation/co-area are discussed in the light of the different experimental evidence.Pubblicazioni consigliate
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