Main characteristics of the RS6000 rheometer (Thermo-Haake), and the geometry-dependent ranges in stress (σ) and shear rate () for a gap of 1mm using 22 mm stator and 20 mm rotor ( 60 mm height) are tabulated below. The standard measuring cells are made of polycarbonate with the thickness of the wall reduced to about 0.2 mm around the X-ray beam position. Aluminum and vespel cells are also available for high temperature and good organic solvents. The wall-thickess is reduced to 0.1 mm at the beam position on the stator and rotor.  

  Angular speed (rpm) Torque (Nm) Stress σ (Pa) Shear rate (s-1) Angular resolution (rad) Frequency (Hz)
min 10-7 2 10-7  10-2 1.5 10-6 3.0 10-7 0.00001
max 1500 0.2 10000 1800 - 100


In addition, a capillary cell with stator 2 mm and rotor 1 mm diameter is also available for lower background in USAXS and samples with limited quantity, however with significantly reducedrheological sensitivity.

T. Narayanan, R. Dattani, J. Möller, and P. Kwaƛniewski,  Review of Scientific Instruments 91, 085102 (2020).

Picture of the RS6000 rheometer installed on the beamline and the schematic view of the scattering geometry.

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