P. Joo et A. Fitch, IONIC AND MOLECULAR-TRANSPORT IN HYDROPHOBIZED MONTMORILLONITE FILMS - AN ELECTROCHEMICAL SURVEY, Environmental science & technology, 30(9), 1996, pp. 2681-2686
Clay-modified electrodes are used to investigate the swelling properti
es of quaternary ammonium cation-modified Wyoming montmorillonite. Dis
ruption of the structure of the clay was observed at modification rate
s exceeding 37% of the available exchange sites. Signals for the trans
port of an anionic pore sampler were attenuated in the presence of the
QAC-modified clays. The electrochemistry of nitrobenzene proved the p
resence of hydrophobic locations within the clay film. Nitrobenzene tr
ansport was attenuated by the presence of the clay film but to a lesse
r extent than the anion, suggesting sorption of the aromatic to the mo
dified clay.