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The as prepared nanoparticles(1 g) were dispersed in a mixture of 100 mL of ethanol and 20 mL of DOW. TEOS (2 mL) and ammonium hydroxide (2.5 mL) were added subsequently under vigorous mechanic stirring at room temperature. After keeping the stirring for 20 h, the obtained Fe3O4/SiO2 composites were washed with ethanol and water for three times and dried under vacuum overnight. Hereafter, the produced composite (1 g) and APTES (1 mL) were dispersed in 50 mL of toluene and stirred at room temperature for 24 h.

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