摘要
根据纳米材料的结构特点,我们把它们分为两类。一类是具有高密度的紧密结构,如文献[1]中报导的纳米铁;只一类是低密度具有大量纳米尺寸空洞的无规网络结构,如文献[2]中报导的纳米氧化锡。两者的根本差别在于是否存在高体积分数的纳米空洞。紧密结构纳米材料具有大量的晶界结构,而多孔网络结构纳米材料具有大量的表面结构,这导致两者物化性质的巨大差异。
According to the structural character of the nanophase materials, the nanophase materials have been divided into two categories: one of them is a kind of tight structure with a high density, such as nanocrystalline Fe in ref [1]; the other is a random network with a low density represented by nanocrystalline SnO_2. The most distinction of the two kinds is that the structure has a high density of nanosize voids or not. The materials with the tight structure consist of grains and great number of interfaces; but the materials with latter structure consist of grains and great number of surfaces. This causes the difference in physical and chemical properties of them.
出处
《功能材料》
EI
CAS
CSCD
1993年第4期303-305,共3页
Journal of Functional Materials
基金
国家自然科学基金
关键词
纳米材料
微结构
nano material
microstnicture
