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Adsorption of cationic ‘gemini’ surfactants at the TiO 2 /solution interface
Author(s) -
Ardizzone S.,
Bianchi C. L.,
Quagliotto P.,
Viscardi G.
Publication year - 2002
Publication title -
surface and interface analysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.52
H-Index - 90
eISSN - 1096-9918
pISSN - 0142-2421
DOI - 10.1002/sia.1380
Subject(s) - cationic polymerization , adsorption , x ray photoelectron spectroscopy , pyridinium , aqueous solution , chemistry , chloride , dimer , inorganic chemistry , monomer , molecule , pulmonary surfactant , titanium dioxide , chemical engineering , polymer chemistry , organic chemistry , polymer , biochemistry , engineering
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. Copyright © 2002 John Wiley & Sons, Ltd.