Layer-by-layer assembly of nanozeolite - Zeolite coated fibers and hollow zeolite fibers

Zeolite coated fibers (abbreviated as ZCF) were successfully fabricated usi ng carbon fibers as templates and nanozeolite as building block, through la yer - by - layer assembly technique. After removal of the templates by calc ination, intact hollow fibers of zeolite (abbreviated as HFZ) were also obt ained. The optimum performance conditions for obtaining these types of mate rials were systematically studied. The pH value of the zeolite colloidal so lution was a key factor affecting the fabrication of these zeolite coated f ibers and hollow zeolite fibers. Other conditions, such as ionic strength o f the dipping solution, drying the samples after every layer of zeolite nan ocrystals deposited and adsorbing a PDDA layer on the silicalite - 1 coated carbon fibers before drying also bad influence on fabricating intact fiber s. The wall thickness and composition of these novel materials could be rea dily tailored by varying the number of nanozeolite/PDDA [poly(diallyldimeth yl ammonium chloride)] deposition cycles and zeolite types used, respective ly. The hollow zeolite fibers with hybrid walls were also fabricated throug h stepwise deposition of different kinds of nanozeolites.