Title: Design and synthesis of hierarchical materials from ordered zeolitic building units
Authors: Kirschhock, Christine ×
Kremer, Sebastien
Vermant, Jan
Van Tendeloo, Gustaaf
Jacobs, Pierre
Martens, Johan #
Issue Date: Jul-2005
Publisher: VCH Verlagsgesellschaft
Series Title: Chemistry - a European Journal vol:11 issue:15 pages:4306-4313
Abstract: The crystallization of colloidal silicalite-1 from clear solution is one of the best understood zeolite formation processes. Colloidal silicalite-1 formation involves a self-assembly process in which nanoslabs and nanotablets with a silicalite-1 type connectivity are formed at intermediate stages. During the assembly process, with strongly anisometric particles present, regions appear with orientational correlations, as evidenced with measurements of dynamic light scattering, viscosity, and rotation of polarized light. The presence of such regions rationalizes the unexpected differences between the crystallization kinetics under microgravity and on earth. The discovery of the locally oriented regions sheds new light on currently poorly understood hydrodynamic effects on the zeolite formation processes, such as the influence of stirring on the phases obtained and the subsequent kinetics. Addition of surfactants or polymers modifies the ordering of the zeolitic building units in the correlated regions, and new types of hierarchical materials named zeogrids and zeotiles can be obtained.
ISSN: 0947-6539
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Soft Matter, Rheology and Technology Section
Centre for Surface Chemistry and Catalysis
× corresponding author
# (joint) last author

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