Also, I would like to know if there was a difference between the size of particles measured by zeta and TEM.
Dear Mohamed Esmat:
DLS method nanoparticle size is defined as the hydrodynamic spheres. Along with the adsorbed molecules of the solvent. DLS technique can not identify it cylindrical or spherical. The diffusion of nanoparticles is determined. TEM method can determine the crystallinity, the distance between the planes of atoms, the shape of the nanoparticles, the size of the adsorption layer ..
Best regards
With Dynamic Light Scattering (DLS) the most robust parameters are the z-average (harmonically weighted intensity mean) and polydispersity index (PDI), a measure of the width of the distribution, from the cumulants analysis. These weight the distribution as r6 (or volume2). Microscopy looks at the numbers of particles and calculated a mean accordingly where each particle has equal validity - D[1,0} in mathematical terms, A 100 nm particle has the same mass as 1 million 1 nm particles. You may say it's a one in a million particle and insignificant but it makes up 50% of the mass (and therefore 50% of the simple value) of the system. See also the attached.
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