Journal
JOURNAL OF MATERIALS CHEMISTRY
Volume 22, Issue 2, Pages 495-501Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c1jm13090k
Keywords
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Funding
- Natural Science Foundation of China [90606003]
- International Science & Technology Cooperation Program of China [2010DFB30300]
- Chinese 863 High Tech Project [2007AA022007]
- Program for New Century Excellent Talents in University [NCET-09-0338]
- Hunan Provincial Natural Science Foundation of China [08111002, 10117002]
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A strategy of combining physical embedding and covalent crosslinking was developed to encapsulate cysteamine-capped quantum dots (QDs) into agarose hydrogel microbeads (AHM). Cystetimine-capped QDs were encapsulated into the pores of agarose hydrogel microbeacis by virtue of hydrogen bonding between the amino groups of cysteamine and hydroxyl groups of agarose, resulting in more than 6.0 x 10(7) QDs per microbead. Polyethylenimine (PEI) and oxalaldehyde were then introduced to form a covalently crosslinked network to further stabilize the encapsulation. The resulting hybrid hydrogel microbeads exhibited high doping capacity and negligible QDs leakage, and enabled optical multicolor barcoding.
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