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纳米材料作为高科技产品在诸多领域有着广泛的应用,但它和百姓生活始终存在着距离,可谓“只闻其名,不见其形”。资料表明,在制取纳米颗粒的过程中存在的最大问题就是硬团聚,即颗粒聚集,导致超过纳米尺寸。如何解决这一问题就成为实验能否成功的关键。笔者选取琼脂作为实验载体,借助琼脂的高分子网络结构阻碍和降低了Al_2O_3的接触机会,从而大大减少了团聚现象的产生,在中学实验室里获得了颗粒尺寸小、分散均匀的纳米Al_2O_3粉体。
As a high-tech product, nanomaterials have been widely used in many fields, but there is always a distance between them and people’s life. The data show that the biggest problem in the process of nanoparticle preparation is the hard agglomeration, ie the agglomeration of particles, which leads to exceeding the nanometer size. How to solve this problem has become the key to the success of the experiment. The author selected agar as the experimental carrier, with agar macromolecule network structure impede and reduce the exposure of Al 2 O 3, thus greatly reducing the agglomeration phenomenon, obtained in the middle school laboratory particle size is small, uniform dispersion of nano-Al 2 O 3 powder .