一个纳米微粒所包含的原子总数随着它的粒径的减小而减少,但粒径的减小会导致粒子的表面积急剧增大,使表面原子所占的比例迅速增加和表面能迅速增大。由于表面原子的增多,导致原子配位不足和高的表面能,使这些表面原子具有高的活性,极不稳定,很容易与其他原子结合,引起纳米粒子 The total number of atoms contained in a nanoparticle decreases as its particle size decreases, but the decrease in particle size results in a sharp increase in the surface area of ​​the particles, a rapid increase in the proportion of surface atoms and a rapid increase in surface energy . Due to the increase of surface atoms, resulting in insufficient coordination of atoms and high surface energy, these surface atoms with high activity, very unstable, it is easy to combine with other atoms, causing nanoparticles