Particle size refers to the dimensions of a particle, usually measured in nanometers (nm) when dealing with nanomaterials. The size of nanoparticles typically ranges from 1 to 100 nm. The importance of particle size cannot be overstated as it influences the surface area-to-volume ratio, which in turn affects the chemical reactivity and physical properties of the material. Smaller particles have a larger surface area relative to their volume, which can enhance catalytic activity and increase the rate of chemical reactions.
