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2 Preparation of Fe3O4@SiO2 nanoparticles The Fe3O4 nanoparticles (300 mg) were redispersed in the mixture of anhydrous ethanol (160 mL) and ultrapure water (40 mL) by sonication for approximately 15 min. Subsequently, under continuous mechanical stirring (700 rpm), ammonium hydroxide (5 mL) and TEOS (0.7 mL) were consecutively added into the reaction mixture. The reaction proceeded at 40 ¡æ for 12 h under continuous mechanical stirring. The resulting product was obtained by magnetic separation and then washed with ultrapure water thoroughly. ÓÃÕâÖÖ·½·¨ºÏ³ÉµÄ£¬Ã¿´Î¿ÉÒԵõ½Fe3O4@SiO2 ¶àÉÙ¸öºÁ¿ËµÄ£¿ÎÒ³¢ÊÔÁËһϠFe3O4 (300 mg)µÃµ½Fe3O4@SiO2 330mg£¬¸Ð¾õ°üÉÏÈ¥µÄSiO2ÊDz»ÊÇÓеãÉÙ°¡£¿²ËÄñһö£¬Ð»Ð»Ö¸µã |
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2Â¥2015-12-25 10:59:45
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3Â¥2015-12-28 19:19:13
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4Â¥2015-12-29 16:34:02









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