非水纳米分散系的冷冻蚀刻电镜原位观测

研究了冷冻蚀刻电镜技术原位观测合成的纳米分散系的制样步骤、制样方法 ,并利用冷冻蚀刻电镜技术原位观测了四种纳米分散系中分散相的粒度、粒度分布和聚集状态 .研究结果表明 :蚀刻时间对电镜照片图像质量有较大影响 ,蚀刻时间应根据分散系中分散相含量、粒度大小来选 ;冷冻蚀刻电镜用于原位观测非水纳米分散系 ,具有准确、直观、清晰、立体的特点 ,并且可同时采集多种信息 .

Freeze-etching Replication Transmission Electron Microscopy In-situ Observation of the Non-aqueous Nano-dispersion System

The step and approach of specimen making for freeze-etching replication transmission electron microscopy(FERTEM) that was used for the in-situ observation of in-situ synthesizing nano-dispersion system were studied. The diameter, diameter distribution and conglomeration behavior of nanoparticles in four sorts of dispersion system were observed by FERTEM technique. The results indicated that the image quality of transmission electron microscopy was closely related to the freeze-ecthing time, and the freeze-ecthing time should correspond to the content and diameter of nanoparticles in the dispersion system. The FERTEM technique provided a reliable means for the in-situ observation of the non-aqueous nano-dispersion system, and can collect manifold information simultaneously.