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Multi-Angle Light Scattering Instrument

The LRSM installed a new Multi-angle Light Scattering Instrument – an LS Spectrometer, from LS instruments in the Spring of 2023.  This instrument enables a broad range of materials characterization through static and dynamic light scattering. Capabilities enabled by the SLS/DLS instrument include particle size determination, studies of relaxation dynamics, and investigation of thermodynamic interactions of species in suspension (e.g., nanoparticles; polymers; colloidal species).

The instrument is equipped with a 3D Cross-correlation capability that enables it to distinguish intensity decorrelation that originates from single vs multiple scattering events. As a result, the instrument can be used to collect dynamic light scattering data from samples that exhibit multiple scattering, i.e. concentrated, opaque systems. The Modulated 3D Cross-Correlation option enhances the signal from the cross-correlation measurement. Additional options include sample rotation (for measurements of non-ergodic systems), and temperature resolved measurements.

Standard measurements:

  • Particle sizing: hydrodynamic Radius (Rh) and radius of gyration (Rg)
  • Size distribution and polydispersity
  • Particle dynamics: diffusion coefficient, mean square displacement,
  • Polymer molecular weight (MW ~ 360 – 3600000 Dalton)
  • 2nd virial coefficient
  • Rayleigh ratio
  • Form and structure factors
  • Inter-particle distance in charged systems
  • Aggregation
  • Etc.

Specifications:


Sample volume 50 μL to 4 ml
Particle size range (Rh) 0.15 nm to 5 μm
Radius of gyration (Rg) 5 nm to 5 μm
Molecular weight 360 – 3,600,000 Dalton
Angular range 12° to 150° (+/- 0.01°) Recommended 15° to 150°
Laser Fiber-coupled laser 120 mW, 638 nm
Correlator 320 channels, delay time 12.5 ns to 15 h, auto- and cross-correlation
Temperature up to 90 °C

Source: https://lsinstruments.ch/en/products/ls-spectrometer

For light scattering tutorials:

 

Facility Type: 
Confocal Microscopy
Materials characterization
Rheometry

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