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納米銀的制備----物理方法

來(lái)源: 時(shí)間:2012-09-08 09:46:23 瀏覽次數:

1 物理粉碎法 物理粉碎法是通過(guò)機械粉碎、超聲波、電火花爆炸等方法將原料粉碎得到納米銀粒子。Sendova M等人Ⅲo 通過(guò)在惰性氣體中,于低溫的襯底上,采用高壓磁控濺射
1 物理粉碎法
物理粉碎法是通過(guò)機械粉碎、超聲波、電火花爆炸等方法將原料粉碎得到納米銀粒子。
Sendova M等人Ⅲo 通過(guò)在惰性氣體中,于低溫的襯底上,采用高壓磁控濺射,制出了含納米銀粒子的二氧化硅薄膜。此方法的特點(diǎn)是操作簡(jiǎn)單易行、成本低,但產(chǎn)品純度低,顆粒分布不均勻,且不容易獲得較小粒徑的產(chǎn)品。
2 真空冷凝法
真空冷凝法是在真空或惰性氣體氛圍中,用加熱、激光、電弧高頻感應等方法產(chǎn)生高溫,使銀原料氣化或形成等離子體,然后驟冷使之凝結得到納米銀粒子。
Baker C等人在惰性氣體氛圍中,通過(guò)冷凝的方法制備出了納米銀粒子。此方法具有純度高、結晶組織好、粒度可控的優(yōu)點(diǎn),但技術(shù)設備要求高,一般要求純度很高的銀原料,且存在著(zhù)納米銀粒子聚結的缺點(diǎn)。但是如何解決設備和原料純度雙高要求是關(guān)鍵的問(wèn)題。
3 機械球磨法
機械球磨法是以粉碎與研磨為主體,控制適當的條件得到純元素、合金或復
合材料的納米銀粒子。
Xu等人曾報道了在一196℃的低溫下對銀粉進(jìn)行高能機械球磨,得到了納米銀粒子。機械球磨法的優(yōu)點(diǎn)是操作簡(jiǎn)單、成本低,但產(chǎn)品純度低,顆粒分布不均勻。因此此方法的關(guān)鍵是如何提高產(chǎn)品純度和增加顆粒的均勻度。
關(guān)鍵字: 
北京 江蘇 山東 天津 浙江
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