LS Instruments DWS RheoLab III Diffusing Wave Spectroscopy Microrheometer

The LS Instruments DWS RheoLab III is a contact-free diffusing wave spectroscopy (DWS) microrheometer for measuring the viscoelastic properties of soft, fragile, turbid, and opaque materials. The system analyzes microstructure dynamics without mechanical contact, shear, or sample deformation.

• Measurement method: Non-contact DWS microrheology
• Sample volume: 150 µL to 1.5 mL, depending on the cuvette used
• Viscosity range: 0.1 mPa·s to 1000 Pa·s
• Frequency range: 0.01 rad/s to 10⁵ rad/s
• Temperature range: 4 to 85°C
• Laser: Class 1, 687 nm, 40 mW
• Sample format: Small-volume sealed cuvettes
• Installed measurement options: DWS particle sizing and backscattering mode
• Included equipment: LSI RheoLab III, computer with LSLab, power cables, and communication cables

The broad frequency range supports analysis across short- and long-timescale dynamics, while the small-volume cuvette format minimizes sample consumption. The instrument is suitable for characterizing gels, polymers, emulsions, complex fluids, biological materials, and other soft-matter systems.

Typical applications include:

• Monitoring curing, gelation, and structural evolution
• Measuring viscoelastic properties of biological and fragile materials
• Studying microstructure changes in turbid or opaque samples
• Supporting formulation development and quality control
• Research in biotechnology, biopharmaceutical development, molecular materials, and synthetic biology workflows

This pre-owned system was made in 2022, cleaned, inspected, calibrated, and tested for DWS measurement, particle sizing, and backscattering performance.