Time Re­solved Multi-Angle Stat­ic Light Scat­ter­ing

The instrument is a home built device described by Becker, A.; Schmidt, M. Macromol.Chem Macromol.Symp. (1991) 50, 249. The instrument makes accessible a time resolved analysis of static light scattering at 19 pairs of fixed observation angles with the angles of each pair being placed on opposite sites of the laser beam respectively. The angles on either side of the laser result in 19 data points equally spaced on a q2-axis. A laser at a wavelength of 632.8 nm and a power of 75 mW (Melles Griot Model 05-LHP-928) is used as a light source. 

Regime of observation angles: 25.84° < Θ < 143.13° 

Regime of momentum transfer: 0.0064 < 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. 

The Instrument makes available a simultaneous recording of the time resolved evolution of the particle mass, the geometric size and the form factor. This enables to follow growth processes with a time resolution of 1 s.

Accessible Quantities: molar mass, squared radius of gyration and form factor. The molar mass is a weight averaged molecular weight. Squared radius of gyration and form factor are z-averaged values.

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