Microfluidic assembly of homogeneous and janus colloid-filled hydrogel granules

Robert F. Shepherd; Jacinta C. Conrad; Summer K. Rhodes; Darren R. Link; Manuel Marquez; David A. Weitz; Jennifer A. Lewis

doi:10.1021/la060759+

Microfluidic assembly of homogeneous and janus colloid-filled hydrogel granules

Robert F. Shepherd, Jacinta C. Conrad, Summer K. Rhodes, Darren R. Link, Manuel Marquez, David A. Weitz, Jennifer A. Lewis

University of Illinois Urbana-Champaign

Research output: Contribution to journal › Article › peer-review

Abstract

The microfluidic assembly of colloid-filled hydrogel granules of varying shape and composition is described. First, drops are formed by shearing a concentrated colloidal microsphere-acrylamide suspension in a continuous oil phase using a sheath-flow device. Both homogeneous and Janus (hemispherically distinct) spheres and disks are produced by confining the assembled drops in microchannels of varying geometry. Next, photopolymerization is carried out shortly after drop breakup to preserve their morphology. Representative wet and dried granules are characterized using fluorescence and scanning electron microscopy, respectively. Our approach offers a facile route for assembling colloid-filled hydrogel granules with controlled shape and composition.

Original language	English (US)
Pages (from-to)	8618-8622
Number of pages	5
Journal	Langmuir
Volume	22
Issue number	21
DOIs	https://doi.org/10.1021/la060759+
State	Published - Oct 10 2006

ASJC Scopus subject areas

General Materials Science
Condensed Matter Physics
Surfaces and Interfaces
Spectroscopy
Electrochemistry

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10.1021/la060759+

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AU - Shepherd, Robert F.

AU - Conrad, Jacinta C.

AU - Rhodes, Summer K.

AU - Link, Darren R.

AU - Marquez, Manuel

AU - Weitz, David A.

AU - Lewis, Jennifer A.

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AB - The microfluidic assembly of colloid-filled hydrogel granules of varying shape and composition is described. First, drops are formed by shearing a concentrated colloidal microsphere-acrylamide suspension in a continuous oil phase using a sheath-flow device. Both homogeneous and Janus (hemispherically distinct) spheres and disks are produced by confining the assembled drops in microchannels of varying geometry. Next, photopolymerization is carried out shortly after drop breakup to preserve their morphology. Representative wet and dried granules are characterized using fluorescence and scanning electron microscopy, respectively. Our approach offers a facile route for assembling colloid-filled hydrogel granules with controlled shape and composition.

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Microfluidic assembly of homogeneous and janus colloid-filled hydrogel granules

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