Time Re­solved Multi-Angle Com­bined Stat­ic and Dy­nam­ic Light Scat­ter­ing

The ALV/CGS-3/MD-8 Multidetection Laser Light Scattering Goniometer System simultaneously analyzes static and dynamic light scattering at 8 different observation angles. A laser at a wavelength of 632.8 nm and a power of 35 mW (Soliton HeNe) is used as a light source. 

Regime of observation angles: 20° < Θ < 136° 

Regime of momentum transfer: 0.0050 nm-1 < q < 0.027 nm-1 (depends on solvent) 

Evaluation of static light scattering reveals a weight averaged molar mass, a mean squared radius of gyration and a form factor of scattering polymers and colloids. The particles usually are smaller than a micrometer. 

Evaluation of dynamic light scattering reveals a diffusion coefficient (and its distribution in case of polydisperse samples) of scattering polymers and colloids. 

The Instrument makes available for the first time  a simultaneous recording of the time resolved evolution of the particle mass, the geometric size and the diffusion coefficient (together with the corresponding hydrodynamically effective radius) and its distribution. This enables to follow growth processes with a time resolution of 10 s.

Accessible Quantities: molar mass, squared radius of gyration, form factor, diffusion coefficient  and its distribution. The molar mass is a weight averaged molecular weight. Squared radius of gyration, form factor and diffusion coefficient are z-averaged values. The diffusion coefficient can be translated into a hydrodynamically effective radius via the Stokes-Einstein relation.

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