The transport properties of ionic (Fe(CN)63- and Ru(NH3)63+) and nonionic (p-benzoquinone and nitrobenzene) probes within hydrophobized montmorillonite flms have been investigated by cyclic voltammetric methods. The rate of hydrophobization was one third less than CEC (cation exchange capacity). Flms permeability was altered by changing the concentration of the supporting NaCl electrolyte and also by creating different rates of hydrophobization. Structural changes can be interpreted by non-DLVO "hydration forces" theories. Diffusional transport exhibited similar properties in the cases of Fe(CN)63- and p-benzoquinone probes, which both have no interactions with the hydrophilic clay film. Permeation rates were changed in the cases of Ru(NH3)63+ and nitrobenzene probes. Causes were different, however: electrostatic interactions played their part with Ru(NH3)63+ ions, while adsorption and partition made the difference in the case of nitrobenzene.
|Number of pages||8|
|Journal||Magyar Kemiai Folyoirat, Kemiai Kozlemenyek|
|Publication status||Published - Aug 1 1997|
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