纳米固体或纳米微粒是指颗粒粒度属于纳米量级 (1～ 10 0ｎｍ)的固态颗粒。固态颗粒有两种来源 :一是自然界本来就存在的 ,如矿产资源 ;二是用人工方法合成的 ,如陶瓷、金属等 ,是用天然矿物原料和化学原料经高温烧结或其他方法制成。相应地纳米材料也有两种来源 :一、自然界中 Nanometer solid or nanoparticle refers to solid particles with a particle size of nanometer (1 ~ 100 nm). There are two sources of solid particles: First, nature has existed, such as mineral resources; the second is the use of synthetic methods, such as ceramics, metals, etc., are natural mineral raw materials and chemical raw materials by high temperature sintering or other methods. Correspondingly, nanomaterials come from two sources: First, in nature