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TA Instruments -Waters Corporation
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TA Instruments - Model ARES-G2 -Rheometer

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The ARES-G2 is the most advanced rotational rheometer for research and material development. Rheology is the study of flow and deformation of materials under the influence of an external force or stress. The combination of stress, strain and shear behavior forms the basis of rheology, the science of the deformation of materials. Rheology measurements are used to ensure successful material processing, optimize product performance, gain insights into complex microstructures and develop novel materials.

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Rheometers are high-precision instruments that measure flow and deformation by applying a force to a sample and measuring the resulting stress or strain, allowing for measurement of viscosity and modulus. Rheological measurements are typically performed using a high-precision instruments known as rheometers to obtain critical material parameters such as viscosity and modulus. With a rheometer, viscosity measurements extend far beyond the limits of a traditional viscometer, characterizing non-Newtonian behaviors like shear thinning, thixotropy, and yield stress of complex fluids (emulsions, suspensions, paints, inks, coatings, slurries). Oscillatory rheology measures viscoelasticity (Storage Modulus, Loss Modulus, Tan Delta) of materials ranging from low-viscosity fluids to stiff solids in DMA mode (Dynamic Mechanical Analysis).
The ARES-G2 is a premier high-performance rheometer that provides the most accurate rheological data over a wide range of conditions. The ARES-G2 is routinely used in leading R&D labs and manufacturing sites to relate the material chemistry to its processability and end-use properties for a wide variety of materials ranging from proteins to polymers, coatings to composites, and everything in between.
Unlike competitive systems, the ARES-G2 is the only rheometer equipped with the industry-leading separate motor and transducer technology (SMT) which eliminates any inertial contributions and provides users with unrivaled data accuracy over a wide range of test conditions. Coupled with fast-responding, uniform, accurate temperature control, the ARES-G2 allows users to perform rheological measurements while replicating processing and end-use conditions. These measurements thus enable users to optimize the processability of new and existing materials in a time- and cost-effective manner, define robust CQAs and ensure that the finished products meet the end-use KPIs around product performance, consumer perception and storage stability. The ARES-G2 accessories are easy to install and use, and they provide an added dimension to rheological measurements. ARES-G2 users gain detailed insights into a material’s micro-structure and relate it to the end-use properties, helping push the boundaries of materials research and development in pure and applied sciences.

The ARES-G2 platform offers an array of features including:

  • Unrivaled data accuracy over a wide range of conditions simulating processing and end-use conditions
    • Only rheometer with true SMT technology that completely eliminates inertia, even under the most challenging conditions
    • Accurate and fast-responding temperature control
  • Complete data transparency and control with access to raw data that can be plotted in TRIOS or easily exported for processing in third-party software
  • Future proof with fully integrated DMA mode for solids testing (bending, tension, compression) and advanced techniques such as:
      • Arbitrary wave
      • Large Amplitude Oscillatory Shear (LAOS)
      • Fourier Transform (FT) Rheology Analysis
      • Orthogonal Superposition (OSP) and 2 Dimensional Small Amplitude Oscillatory Shear (2D-SAOS) techniques
      • Optimally windowed-chirp (OWCh)

and much more…

Force/Torque Rebalance Transducer (Sample Stress)

  • Transducer Type: Force/Torque Rebalance
  • Transducer Torque Motor: Brushless DC
  • Transducer Normal/Axial Motor: Brushless DC
  • Minimum Transducer Torque in Oscillation: 0.05 µN.m
  • Minimum Transducer Torque in Steady Shear: 0.1 µN.m
  • Maximum Transducer Torque: 200 mN.m
  • Transducer Torque Resolution: 1 nN.m
  • Transducer Normal/Axial Force Range: 0.001 to 20 N
  • Transducer Bearing: Groove Compensated Air

An accurate mechanical measurement is based on the fundamental assumption of a controlled variable (stimulation) and a measured variable (response). The separation of these key experimental quantities guarantees the greatest accuracy. Moreover, the analytical components dedicated to each task should be optimized to their assigned role. In the case of a modulus measurement, the application of strain and the measurement of stress should be separated, or in the case of a viscosity measurement, the application of strain rate and the measurement of stress are to be decoupled.This is the approach taken by the TA Instruments ARES-G2, leading to measurements free of instrument artifacts over wide ranges of stress, strain, and frequency.