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Seedless assembly of colloidal crystals by inverted micro-fluidic pumping

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Abstract

We propose a simple seedless approach to assemble millimeter sized monolayer single colloidal crystals with desired orientations at predetermined locations on an unstructured charged substrate. This approach utilizes the millimeter-ranged fluid flow on the bottom glass substrate induced by an ion exchange resin (IEX) fixed on top of the closed sample cell. The fluid flow increases with decreasing height of the sample cell and increasing radius R of the IEX. For a single inverted pump, millimeter sized monolayer single crystals of hexagonal close packing can be obtained. For two closely spaced (D ∼ 4R) pumps, the formed crystals have a predefined orientation along the line connecting the two IEX. By patterning IEX into different structures, colloidal crystals of different complex patterns form. The present method paves a convenient way for fabricating high quality monolayer colloidal crystals for a variety of applications.

Graphical abstract: Seedless assembly of colloidal crystals by inverted micro-fluidic pumping

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Publication details

The article was received on 04 Feb 2018, accepted on 13 Mar 2018 and first published on 13 Mar 2018


Article type: Paper
DOI: 10.1039/C8SM00256H
Citation: Soft Matter, 2018, Advance Article
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    Seedless assembly of colloidal crystals by inverted micro-fluidic pumping

    R. Niu and T. Palberg, Soft Matter, 2018, Advance Article , DOI: 10.1039/C8SM00256H

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