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The viscoelastic behavior of polymer solutions is commonly measured usingoscillating shear rheometry, however, the accuracy of such methods is limitedby the oscillating frequency of the equipment and since the relaxation time ofthe dilute polymer solutions is short, this requires measurement at very highfrequencies. Microrheology has been proposed to overcome this technicalchallenge. Yet the equipment for resolving the statistics of particledisplacements in microrheology is expensive. In this work, we measured theviscoelastic behavior of Methocel solutions at various concentrations using aconventional epi-fluorescence microscope coupled to a high-speed intensifiedcamera. Statistical Particle Tracking is used in analyzing the mean-squareddisplacement of the dispersive particles. Relaxation times ranging from 0.76 -9.00 ms and viscoelastic moduli, G' between 11.34 and 3.39 are reported forMethocel solutions of concentrations between 0.063 - 0.5%

Measuring the viscoelastic behavior of dilute polymer solutions using high-speed statistical particle microrheology