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Multi-Sample Couette Viscometer for Polymer Formulations



H J. Walls, Robert F. Berg, Eric J. Amis


We describe a prototype scalable viscometer aimed at facilitating rapid measurements of multiple samples. The device simultaneously measures the viscosity of four samples in an array of Couette cells. Each cell contains a rotor with an embedded permanent magnet that is driven by an oscillating magnetic field generated by a 2-axis Helmholtz coil. The angular displacement of the rotors is recorded by a CCD camera. Image analysis determines the amplitude and phase of the rotors with respect to the coil s sinusoidal current. The viscosity of each sample influences the amplitude and phase of the rotor, which can be predicted with a viscously damped oscillator model. We present data for Newtonian fluids with viscosities from 50 to 2,000 mPa s. The results suggest that our approach can be extended to non- Newtonian fluids.
Measurement Science & Technology
No. 1


combinatorial methods, combinatorial viscometer, Couette cell, high throughput materials testing, magnetic rheometer, rheology


Walls, H. , Berg, R. and Amis, E. (2005), Multi-Sample Couette Viscometer for Polymer Formulations, Measurement Science & Technology, [online], (Accessed July 12, 2024)


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Created January 1, 2005, Updated February 19, 2017