Journal
ELECTROPHORESIS
Volume 32, Issue 23, Pages 3424-3430Publisher
WILEY-BLACKWELL
DOI: 10.1002/elps.201100303
Keywords
Colloidal crystals; Interconnected ordered nanoporous networks; Nanofluidics; Protein concentration; Surface-charge induced ion depletion effect
Funding
- National 973 Basic Research Program [2007CB714501, 2007CB936404]
- National Natural Science Foundation of China [21035002, 20975047, 20890020]
- National Science Fund for Creative Research Groups [20821063]
- Natural Science Foundation of Jiangsu Province [BK2010009]
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We report a controllable method to fabricate silica colloidal crystals at defined position in microchannel of microuidic devices using simple surface modification. The formed PCs (photonic crystals) in microfluidic channels were stabilized by chemical cross-linking of Si-O-Si bond between neighboring silica beads. The voids among colloids in PCs integrated on microfluidic devices form interconnected nanoporous networks, which show special electroosmotic properties. Due to the surface-charge induced ion depletion effect mechanism, FITC-labeled proteins can be efficiently and selectively concentrated in the anodic boundary of the ion depletion zone. Using this device, about 103- to 105-fold protein concentration was achieved within 10?min. The present simple on chip protein concentration device could be a potential sample preparation component in microfluidic systems for practical biochemical assays.
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