第 32 卷第 4 期 |  | Vol. 32 No. 4 | 2002 年 8 月 | Aug 2002 |
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所屬欄目:其它
均相成核—水熱法制備納米氧化鋅 |
商桑斌; 楊幼平; 劉開(kāi)宇(中南大學(xué)化學(xué)化工學(xué)院; 湖南長(cháng)沙; 410083) |
摘 要:制備納米氧化鋅的關(guān)鍵是成核與生長(cháng)控制。采用尿素為均相沉淀劑 ,結合水熱處理 ,溫度 130℃ ,反應時(shí)間為 3~ 5h制備了粒徑小 ,分布窄的納米氧化鋅。Zn2 +的均相成核與其濃度、OH- 的濃度有關(guān) ,體系中Zn(OH) 2 的過(guò)飽和度越大 ,則成核數量越多 ,所制備的氧化鋅顆粒越小 ;與以氫氧化鋅膠體為前驅體的共沉淀技術(shù)相比 ,均相沉淀技術(shù)有利于氧化鋅納米晶粒均勻生長(cháng) ;此外 ,添加有機物作分散劑可以減弱微小晶粒間的疊合生長(cháng) ,有利于制備均一性較好的納米氧化鋅。 |
關(guān)鍵詞:納米氧化鋅; 均相成核; 水熱處理 |
中圖分類(lèi)號:TQ132.4 文獻標識碼:A 文章編號:1009-9212(2002)04-0049-02 |
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Synthesis of Nanoscale ZnO by Homogeneous Nucleation in Hydrothermal Process |
SANG Shang-bin; et al(College of Chemisty and Chemical Engyneering; Central South University; Changsha; 410083; China) |
Abstract:Using urea as homogeneous precipitation agent,nanosize zinc oxide crystalline with a small size and a narrow size ditribution has been synthesized at 130℃ and a reaction time 2~5h by homogeneous nucleation method in hydrothermal process.The greater the supersuturaton of Zn(OH) 2,the more the nuclei,and the smaller the crystallines.The number of nuclei formed in the nucleation process depends on the concentration of Zn 2+ and OH -.Compared with the dissolution and recrystallization process in which Zn... |
Key words:nanoscale ZnO; homogeneous nucleation; hydrothermal process |
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收稿日期:2002-07-20
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