Zeolitic jelly-donuts: Micron-sized cubes of zeolite A having a monocrystalline shell and an amorphous core were synthesized by in situ crystallization of sodium aluminosilicate gel in uncrosslinked chitosan hydrogel. Formation of cubelike core–shell structures involves particle aggregation and surface-to-core crystallization induced by the hydrogel network, and provides a new model for zeolite nucleation and growth mechanisms.
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Yao et al. (2008) studied this question.
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