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Publication Citation: Multi-Sample Couette Viscometer for Polymer Formulations

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Author(s): H J. Walls; Robert F. Berg; Eric J. Amis;
Title: Multi-Sample Couette Viscometer for Polymer Formulations
Published: January 01, 2005
Abstract: 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.
Citation: Measurement Science & Technology
Volume: 16
Issue: No. 1
Keywords: combinatorial methods;combinatorial viscometer;Couette cell;high throughput materials testing;magnetic rheometer;rheology
Research Areas: Polymers