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  • Title: Capillary viscometer for fully automated measurement of the concentration and shear dependence of the viscosity of macromolecular solutions.
    Author: Grupi A, Minton AP.
    Journal: Anal Chem; 2012 Dec 18; 84(24):10732-6. PubMed ID: 23130673.
    Abstract:
    The construction and operation of a novel viscometer/rheometer are described. The instrument is designed to measure the viscosity of a macromolecular solution while automatically varying both solute concentration and shear rate. Viscosity is calculated directly from Poiseuille's law, given the measured difference in pressure between two ends of a capillary tube through which the solution is flowing at a known rate. The instrument requires as little as 0.75 mL of a solution to provide a full profile of viscosity as a function of concentration and shear rate, and it can measure viscosities as high as 500 cP and as low as 1 cP, at shear rates between 10 and 2 × 10(3) s(-1). The results of control experiments are presented to document the accuracy and precision of measurement at both low and high concentration of synthetic polymers and proteins.
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