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??÷•?????????The preparation of different sized silica spheres involves the ammonia-catalyzed hydrolysis and condensation of TEOS in an aqueous ethanol solution via the classical st?ober method.21,22 Taking the synthesis of ∼190 nm silica spheres as an example, 15 mL of absolute ethanol, 5 mL of DI water, and 0.7 mL of 28% NH3 3H2O were mixed and stirred. A total of 0.6 mL of TEOS was added into the mixture quickly. After a reaction time of about 10 h, the silica spheres were isolated by centrifugation. Then the white precipitate was washed with ethanol three times.
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