In this paper, the colloidal properties of nanosized zeolites with MFI and BEA topology structure were investigated. It is found thatξ potential of nanosized zeolites varied with the change of zeolite structures and composition. The influences of salt concentration and pH value on theξpotential of the nanosized zeolites have been studied. With the increase of the salt concentration, theξ potential gradually decreased and even possessed opposite charges. The effects ofξpotential on the colloidal aggregation and stability are also detected. A cretainξpotential is necessary to stabilize the zeolite colloid, while too lowξpotential may bring on aggregation of the colloid. At stuitabie temperature, nanozeolite can be self- assembled by capillary force to form transparent self-standing fibers. The crystal size significantly influences the character of the products. The zeolites with smaller crystal size are rather apt to form long, dense and transparent zeolite fibers.

Key words: NANOPHASE MATERIALS, ZEOLITE, COLLOID, ELECTRIC POTENTIAL, ELECTROLYTE