Monodispersed superfine ZnO powders with particle size of about 200～ 400nm were successfully prepared by the decompressed distillation process with n butyl alcohol as the solvent. The starting materials were Zn(NO3)2...Monodispersed superfine ZnO powders with particle size of about 200～ 400nm were successfully prepared by the decompressed distillation process with n butyl alcohol as the solvent. The starting materials were Zn(NO3)2· 6H2O and NH3· H2O. TG DSC, XRD, TEM and BET surface areas techniques were used to characterize the precursor and as prepared superfine ZnO powders. In the preparation process of superfine ZnO powders, two techniques including the decompressed distillation with n butyl alcohol and washing with absolute ethanol were used to avoid agglomeration. It is showed that the decompressed distillation process has a better effect in avoiding agglomeration than washing with absolute ethanol. The precursor obtained by the decompressed distillation technique has a lower calcination temperature than the one obtained by washing with absolute ethanol. Zincite phase of ZnO with some impurities was obtained when the precursor was calcined at 200℃ for 2h. After it was calcined at 300℃ for 2h, pure superfine ZnO powder was obtained.展开更多
文摘Monodispersed superfine ZnO powders with particle size of about 200～ 400nm were successfully prepared by the decompressed distillation process with n butyl alcohol as the solvent. The starting materials were Zn(NO3)2· 6H2O and NH3· H2O. TG DSC, XRD, TEM and BET surface areas techniques were used to characterize the precursor and as prepared superfine ZnO powders. In the preparation process of superfine ZnO powders, two techniques including the decompressed distillation with n butyl alcohol and washing with absolute ethanol were used to avoid agglomeration. It is showed that the decompressed distillation process has a better effect in avoiding agglomeration than washing with absolute ethanol. The precursor obtained by the decompressed distillation technique has a lower calcination temperature than the one obtained by washing with absolute ethanol. Zincite phase of ZnO with some impurities was obtained when the precursor was calcined at 200℃ for 2h. After it was calcined at 300℃ for 2h, pure superfine ZnO powder was obtained.
