期刊
JOURNAL OF MATERIALS CHEMISTRY
卷 21, 期 31, 页码 11472-11477出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c1jm10432b
关键词
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资金
- National Creative Research Initiative [R16-2002-003-01001-0]
- World Class University, National Research Foundation of Korea (NRF) [R31-10013]
- Hanwha Chemical Co
- SNU
- Ministry for Health, Welfare & Family Affairs, Republic of Korea [A092145]
- Seoul Science Fellowship
- [2010-0029138]
We report a transformation of hydrophobic iron oxide nanoparticles to hydrophilic and biocompatible maghemite nanocrystals by controlled thermal treatment followed by dextran coating. Sodium sulfate salt was used as matrix for preventing aggregation during the thermal treatment at high temperature. Through the thermal treatment and subsequent isolation process, highly crystalline bare maghemite nanocrystals with high magnetization were produced. Subsequent coating with dextran derivatives produced hydrophilic and biocompatible iron oxide nanocrystals. Among various kinds of dextran derivatives, polyanionic carboxymethyl dextran (CM-dextran) was most efficient for stabilizing the nanocrystals in aqueous media. CM-dextran coated nanocrystals exhibited high relaxivity originating from the high magnetization and assembled structure.
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