This is an entry level system for the measurement of particle size at a 90 degree scattering angle using Dynamic Light Scattering, also with the ability to measure zeta potential and molecular weight using Static Light Scattering.

The principle of dynamic light scattering is that fine particles and molecules that are in constant random thermal motion, called Brownian motion, diffuse at a speed related to their size, smaller particles diffusing faster than larger particles. To measure the diffusion speed, the speckle pattern produced by illuminating the particles with a laser is observed. The scattering intensity at a specific angle will fluctuate with time, and this is detected using a sensitive avalanche photodiode detector (APD). The intensity changes are analyzed with a digital autocorrelator which generates a correlation function. This curve can be analyzed to give the size and the size distribution.

Size measurement and Zeta potential measurement Rs. 450 per sample