Linkage-nondestructive surface migration of zeolite microcrystals during monolayer assembly on glass through ionic linkages.
Monolayers of zeolite microcrystals were prepared on glass plates with three different types of linkage between zeolite crystals and the substrate, namely, (a) covalent, (b) ionic, and (c) poly electrolyte-mediated ionic linkages using sonication with stacking (SS) as the method. The required periods for the coverage to reach 100% were 2, 3, and 7 min, respectively, upon changing the linkage from (a) to (b) and to (c), respectively, indicating that the surface migration becomes slower as the binding strength increases. The coverage, binding strength, and degree of close packing gradually decreased with reaction time with (a) as the linkage while those with (b) and (c) as the linkages remain essentially unaltered. The results indicate that the surface migration of crystals undergo linkage-destructively when crystals were attached to the substrates through covalent linkages and linkage-nondestructively when crystals were attached to the substrates through ionic linkages.
Lee
Jin Seek
JS
Center for Microcrystal Assembly, Center for Nanoporous Materials, Department of Chemistry, and Program of Integrated Biotechnology, Sogang University Seoul 121-742, Korea.
Yoon
Kyung Byung
KB