Nanoscale materials in chemistry Particle radii Number of atoms Percentage of surface atoms 10nm 4000 40% 1nm 30 99% 100 20 0 10 2030 4050 粒度nm Ex.Gold particles between 2 to 3 nm in diameter becomes chemically active.Nanoscale materials in chemistry Particle radii Number of atoms Percentage of surface atoms 10nm 4000 40% 1nm 30 99% Ex. Gold particles between 2 to 3 nm in diameter becomes chemically active