We compared rheological properties of various polymer solutions as measured by particle tracking microrheology and conventional rheometry. First, zero shear viscosity was obtained using Stokes-Einstein equation at longer times of mean square displacement (MSD) curve in particle tracking microrheology, and compared to the one determined by rotational-type bulk rheometer. The zero shear viscosity from particle tracking microrheology matched well with the one from bulk rheometry. Second, dynamic modulus was determined using two models, Maxwell model and Euler's equation, since these have been most frequently adopted in previous studies. When Euler's equation was used, loss modulus matched well with the one from bulk rheometry for all frequency range. However, storage modulus was unstable at low frequencies, stemming from non-smoothing out in fitting process. When the Maxwell model was used, two results agreed well at low concentration of polymer solution, and the dynamic modulus at small frequency region which are difficult to detect in bulk rheometry could also be measured. However, both zero shear viscosity and dynamic modulus at higher concentration polymer solution from particle tracking microrheological measurement deviated from those from bulk rheometry, due to the error caused by limited resolution of the apparatus. Based on these results, we presented a guideline for the reliable performance of this new technique.
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