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In a typical procedure, 0.5 mL of the Fe3O4 nanocrystals in chloroform was poured into 5 mL of 0.55M aqueous cethyltrimethylammonium bromide (CTAB) solution and the resulting solution was stirred vigorously for 30 min. The formation of an  oil-in-water microemulsion resulted in a turbid brown solution. Then, the mixture was heated up to 60 degree and aged at that temperature for 10 min under stirring to evaporate the chloroform , resulting in a transparent black Fe3O4/CTAB solution. The resulting solution was added to a mixture of 45 mL of water and 0.3 mL of 2M NaOH solution and the mixture was heated up to 70oC under stirring. Then, 0.5 mL of  tetraethylorthosilicate (TEOS), 50  ¦ÌL of RITC-APTES solution, and 3 mL of ethylacetate was added to the reaction solution in sequence.
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