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Ferrite magnetic nanoparticles
Fe3O4 (2 g) and NiCl2¡¤6H2O (10 wt% of nickel on ferrite) were stirred at
room temperature in aqueous solution for 1 h. After impregnation, the
suspension was adjusted to pH 12 by adding sodium hydroxide (0.5m)
and stirred for 10 to 12 h. The solid was washed by distilled water (5
10 mL). The obtained metal precursors were reduced by adding an aqueous
solution of 0.2m NaBH4 dropwise under gentle stirring in an ice¨C
water bath for 30 min until no bubbles were observed in the solution.
The resulting Fe3O4Ni MNPs were ultrasonicated for 10 min and then
washed with distilled water and subsequently with ethanol. The synthesized
Fe3O4Ni MNPs were characterized by several techniques such as
XRD, ICP-AES, TEM, and FEG-SEM-EDS.£¬ÇëÎÊÕâÀïÃæµÄÅðÇâ»¯ÄÆÓ¦¸ÃÔõô´¦Àí£¿ÎÒÖ±½ÓÅäÖÆµÄÅðÇâ»¯ÄÆÈÜÒº¼Óµ½ÈÜÒºÖÐÈ¥£¬Ã»Óеõ½ÀíÏëЧ¹û¡£

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