Accessory for MCR:
Characterization of magneto-rheological fluids
Magneto-rheological fluids (MRF) are “smart” materials which react almost instantly to an applied magnetic field with a change in their rheological properties. This change in rheological properties (e.g. an increase of viscosity) can be simulated and measured with an MCR rheometer combined with the Magneto-Rheological Device. This setup enables the application of a controlled magnetic field with a flux density of more than 1 Tesla.
Full control of all parameters and results
The Magneto-Rheological Device is used to investigate the influence of a magnetic field on magneto-rheological fluids. The applied magnetic flux density of more than 1 Tesla is controlled and adjusted by the rheometer software. In addition, a Hall sensor and a temperature sensor allow online measurements of the actual magnetic flux density and temperature. All parameters are directly transferred to the rheometer software. Predefined measuring templates and an automated demagnetization process are also available.
Simulation of a magnetic field under perfectly controlled conditions
A bottom plate with built-in coils produces a unique magnetic field of up to 1.4 Tesla in the air gap. In combination with a magnetic yoke, which covers the bottom plate, a homogenous magnetic field and perpendicular field lines with respect to the plate are obtained. The combined liquid and Peltier temperature control allows you to control the sample temperature between -10 °C and 170 °C (lower temperatures available on request). The parallel-plate system with 20 mm diameter is made of non-magnetized metal, preventing radial forces acting on the shaft.
A patented technology keeps the sample in place even at high shear rates
Many magneto-rheological fluids and some ferrofluids show elastic properties when subjected to a magnetic field, therefore they tend to escape the gap when high shear is applied. The patented TwinGap™ geometry solves this problem with a unique design. It consists of a ferromagnetic parallel-plate system which is filled with sample underneath, at the edge and on the top. A cover seals the system and encloses the sample, enabling measurements at shear rates of up to 3000 s-1.
Smart solution for investigating many different applications
Due to their unique (“smart”) rheological properties, magneto-rheological fluids and ferrofluids are used in a variety of different applications. Typical examples of such applications include:
- Engineering: clutches, valves, sealing, brakes, dampers, shock absorbers
- Medicine: drug targeting, magnetic hyperthermia, human prosthesis
- Seismic dampers, body armor, heat transfer, and many more
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Combined rheological methods - From rheo-optics to magneto-rheology and beyond Application Reports
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