FORMATION OF MONODISPERSED SNO2 POWDERS OF VARIOUS MORPHOLOGIES
FORMATION OF MONODISPERSED SNO2 POWDERS OF VARIOUS MORPHOLOGIES
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DOI：
10.1007/bf00652261
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发表时间：
1995-07-01
影响因子：
2.4
通讯作者：
MATIJEVIC, E
中科院分区：
文献类型：
--
作者：
OCANA, M;SERNA, CJ;MATIJEVIC, E
描述了由窄尺寸分布和各种形态的颗粒组成的胶体 SnO2 粉末的几种制备程序。 SnCl4 气溶胶在气态氨存在下水解，产生众态直径 < 2 μm 的结晶不良的 SnO2 球体。根据制备条件，酸性 (HCl) SnCl4 溶液的强制水解会产生棱柱形颗粒或由微小、强烈聚集、伸长的亚基组成的球晶。在这两种情况下，颗粒均处于纳米尺寸范围（< 100 nm），具有晶体金红石结构。在甲酰胺存在下，SnCl4溶液水解可得到结晶度良好的棒状SnO2颗粒（约0.3μm）。结论是，溶解的 SnCl4 的水解往往会产生拉长的 SnO2 颗粒，根据实验条件，这些颗粒可能处于不同的聚集状态。
Several procedures for the preparation of colloidal SnO2 powders, consisting of particles of narrow size distribution and of various morphologies, are described. The hydrolysis of SnCl4 aerosols in the presence of gaseous ammonia produces poorly crystalline SnO2 spheres of modal diameters < 2 mu m. Depending on the preparation conditions, the forced hydrolysis of acidic (HCl) SnCl4 solutions yields either prismatic particles or spherulites composed of tiny, strongly aggregated, elongated subunits. In both cases the particles are in the nanometer size range (< 100 nm) having crystalline rutile structure. Rod-like SnO2 particles (similar to 0.3 mu m) of good crystallinity can be obtained by hydrolysis of SnCl4 solutions in the presence of formamide. It is concluded that the hydrolysis of dissolved SnCl4 tends to produce elongated SnO2 particles which, depending on the experimental conditions, may be at different aggregation states.