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Externally directed assembly of disk-shaped zeolite particles by an electric field

Published online by Cambridge University Press:  25 January 2011

Manish Mittal ,
Raul F. Lobo  and
Eric M. Furst
Manish Mittal
Affiliation:
Department of Chemical Engineering, University of Delaware, Newark, Delaware 19716
Raul F. Lobo
Affiliation:
Department of Chemical Engineering, University of Delaware, Newark, Delaware 19716
Eric M. Furst*
Affiliation:
Department of Chemical Engineering, University of Delaware, Newark, Delaware 19716
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

Alternating current (AC) electric fields generated by coplanar electrodes are used to externally direct the assembly of submicrometer sized disk-shaped zeolite particles. At the edge of the electrode, zeolite particles assemble in a brushlike structure that forms because of an interplay between an induced dipolar interaction and the drag force due to AC electroosmotic flow. Far from the electrode edge, where the fluid is quiescent, the disk-shaped particles form a nearly hexagonally close-packed structure, similar to suspensions of spherical particles. These results demonstrate a surprising generality of field-directed structures and offer promise for a hierarchical fabrication of nanostructures from zeolites.

Type
Reviews
Information
Journal of Materials Research , Volume 26 , Issue 2: Focus Issue: Self-Assembly and Directed Assembly of Advanced Materials , 28 January 2011 , pp. 215 - 222
Copyright
Copyright © Materials Research Society 2011

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