Abstract
During systematic research into the intercalation of alkylamines in layered α-[Zr(PO 4) 2]H 2 · H 2O, some favorable cases have been found in which the intercalate, in the presence of water, exfoliates giving rise to a colloidal dispersion of platelike particles of zirconium phosphate partially or totally neutralized by alkylammonium ions. This exfoliation occurs dramatically during the intercalation of propylamine. From this dispersion, very similar to that obtained with smectite clays, a suspension of very thin lamellae of highly hydrated α-[Zr(PO 4) 2]H 2 is formed after a deintercalation process. The thin lamellae may be easily recomposed in the form of films, membranes, or flexible pellicles by filtering the suspension on a porous plastic filter or by spraying the suspension on a suitable support and leaving it to dry. The present paper reports the conditions for the formation of the colloidal dispersion as well as the preparation of the pellicles, films, and membranes. Finally, some properties of the colloidal dispersion and the membranes are reported. Pellicular zirconium phosphate shows promise for applications in the field of ion-exchange, heterogeneous catalysis, chromatographic supports, and protonic conductors.
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