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LS Instruments - Model DWS RheoLab -Optical Rheometer
The DWS RheoLab™ is an optical rheometer. It provides access to the sample`s viscoelastic properties over an unmatched frequency range and enables the study of textures and microstructures while requiring only small sample volumes. Since the measurements are contact-free and non-destructive, the use of a tightly sealed sample cell allows studies of stability or shelf-life over long periods for highly viscoelastic and fragile microstructures. Based on the powerful DWS Microrheology technique, the DWS RheoLabTM is ideally suited for a wide range of viscoelastic samples, including polymers, microgels, protein solutions, emulsions, particle suspensions, dairy, and cosmetic products.
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What can it measure?
- Viscosity
- Elasticity
- Mean square displacement
- Particle size
- 2 in 1 instrument: Both a rheometer and a particle sizer
- Measure highly viscous samples
- Characterize fragile microstructures
- Technology : Diffusing Wave Spectroscopy with Echo Technology (EU Patent)
- Scattering geometry : Transmission (backscattering optional)
- Viscosity range : 0.1 m Pa · s to 1000 Pa · s *
- Storage (G’) & loss (G’’) moduli : 1 Pa to 50 kPa *
- Frequency range : 0.5 rad/s to 105 rad/s (106 rad/s with extended frequency upgrade)
- Particle sizing** (radius) : 0.1 to 1 µm * (accuracy of ±5% in the turbid range)
- Cuvette sizes : 1 x 10 mm, 2 x 10 mm, 5 x 10 mm, 10 x 10 mm
- Sample volume : 150 µL to 1.5 mL, depending on cuvette used
- Temperature range : 5 to 100 °C (optional: 5 to 180 °C) with stability better than ±0.02 °C ***
- Laser class : 1
- Laser : 685 nm with 45 mW
- Detector : High sensitive APD, QE > 65%
- Detection : Single mode fiber with integrated optics
- Correlator :
- Two channel multiple tau, 12.5 ns to 1 h
- Two channel linear tau with selectable lag time
- Software : Including microrheological analysis
- Laboratory requirements : < 60 % relative humidity and T = 17 to 26 °C
- Size : 38 x 31 x 24 cm
- Weight : Approx. 14 kg