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For the preparation of CeO2 nanoparticles, cerium nitrate and azodicarbonamide were used as starting materials and other materials were used as additives. Typically, 0.434 g Ce(NO3)3 ¢ 9H2Owas dissolved in 50mLdoubly distilledwater, and 0.11 g AZOwas added to the aqueous solution of Ce(NO3)3. This is followed by the addition of a different amount of additives.The solution was sonicated at room temperature for 3 h by a high-intensity ultrasonic probe (Misonix, XL sonifier, 1.13-cm-diameter Ti horn, 20 KHz, 100 W/cm2). During sonication,the temperature of the reaction mixture rose to ca. 80¡ÀC. The suspension was then centrifuged, and the precipitate was washed with distilled water and ethanol and then dried under vacuum at room temperature. A yellow fine powder was obtained. The pH of the solution is measured before and after the sonication and is found to increase after the reaction. |
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lcc830306(½ð±Ò+5):лл ²¹³ä 2010-05-04 11:02
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