Microrheology of polyethylene oxide using diffusing wave spectroscopy and single scattering

@article{citeulike:822252, abstract = {Experiments investigating the local viscoelastic properties of a simple uncross-linked flexible polymer are performed on polyethylene oxide solutions in the semidilute regime using polystyrene beads of varying sizes and surface chemistry as probes. We measure the thermal motions of the beads to obtain the elastic and viscous moduli of our sample. Two different dynamic light scattering techniques; diffusing wave spectroscopy and quasielastic light scattering (QELS); are used to determine the dynamics of the probe particles. Diffusing wave spectroscopy probes the short time dynamics of the scatterers while QELS or single scattering measures the dynamics at larger times. This results in a larger frequency overlap of the data obtained from the microrheological techniques with the data obtained from the conventional bulk measurements. The moduli are estimated using a modified algebraic form of the generalized Stokes-Einstein equation. Comparison of microrheology with bulk measurements shows excellent similarity confirming the applicability of this method for simple; uncross-linked polymeric systems.}, author = {Dasgupta, Bivash R. and Tee, Shang-You and Crocker, John C. and Frisken, B. J. and Weitz, D. A. }, citeulike-article-id = {822252}, doi = {10.1103/PhysRevE.65.051505}, journal = {Physical Review E}, keywords = {dws, microrheology, weitz}, month = {May}, number = {5}, pages = {051505+}, posted-at = {2008-04-28 20:33:18}, priority = {2}, publisher = {American Physical Society}, title = {Microrheology of polyethylene oxide using diffusing wave spectroscopy and single scattering}, url = {http://dx.doi.org/10.1103/PhysRevE.65.051505}, volume = {65}, year = {2002} }

TY - JOUR ID - citeulike:822252 TI - Microrheology of polyethylene oxide using diffusing wave spectroscopy and single scattering JF - Physical Review E VL - 65 IS - 5 SP - 051505 PB - American Physical Society N2 - Experiments investigating the local viscoelastic properties of a simple uncross-linked flexible polymer are performed on polyethylene oxide solutions in the semidilute regime using polystyrene beads of varying sizes and surface chemistry as probes. We measure the thermal motions of the beads to obtain the elastic and viscous moduli of our sample. Two different dynamic light scattering techniques; diffusing wave spectroscopy and quasielastic light scattering (QELS); are used to determine the dynamics of the probe particles. Diffusing wave spectroscopy probes the short time dynamics of the scatterers while QELS or single scattering measures the dynamics at larger times. This results in a larger frequency overlap of the data obtained from the microrheological techniques with the data obtained from the conventional bulk measurements. The moduli are estimated using a modified algebraic form of the generalized Stokes-Einstein equation. Comparison of microrheology with bulk measurements shows excellent similarity confirming the applicability of this method for simple; uncross-linked polymeric systems. KW - dws KW - microrheology KW - weitz AU - Dasgupta, Bivash AU - Tee, Shang-You AU - Crocker, John AU - Frisken, BJ AU - Weitz, DA PY - 2002/05/20/ UR - http://dx.doi.org/10.1103/PhysRevE.65.051505 ER -