Transcription of Dynamic Light Scattering Training
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Dynamic Light Scattering Training Achieving reliable nano particle sizing Dr Ryan Shaw (Sales and Application Support) Light Scattering Theory Aims of this 1 Understand what Light Scattering is 2 Understand what Rayleigh Scattering is 3 Understand what Mie Scattering is What is Light Scattering ? Light Scattering is a consequence of the interaction of Light with the electric field of a small particle or molecule An incident photon induces an oscillating dipole in the electron cloud As the dipole changes, energy is radiated in all directions This radiated energy is called scattered Light Rayleigh Theory Rayleigh theory is applicable for small particles and molecules whose diameters are less than 1/10th of the laser wavelength ( For the He-Ne laser ( = 633nm) used in the Zetasizer, this equates to particles less than about 60nm The Scattering produced by such small particles is isotropic equal in all directions The intensity of Light they produce is proportional to d6 where d is the particle diameter (ie.))
Protein Analysis (L Curve) › Best suited for protein samples – will give narrow peaks › Automatically picks the optimal solution (distribution) › Calculates 20 possible distributions and the closeness of fit (X-axis) is plotted as a function of smoothness (Y-axis) › Tangents are fitted and the intersection between the
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