Size is a fundamental parameter that affects the physical and chemical properties of nanoparticles. Techniques like Dynamic Light Scattering (DLS), Transmission Electron Microscopy (TEM), and Scanning Electron Microscopy (SEM) are commonly used to measure nanoparticle size. Smaller nanoparticles have a larger surface area-to-volume ratio, which can significantly influence their reactivity and interaction with biological systems.
