Motion of molecular probes and viscosity scaling in polyelectrolyte solutions at physiological ionic strength

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Abstract

We investigate transport properties of model polyelectrolyte systems at physiological ionic strength (0.154 M). Covering a broad range of flow length scales-from diffusion of molecular probes to macroscopic viscous flow-we establish a single, continuous function describing the scale dependent viscosity of high-salt polyelectrolyte solutions. The data are consistent with the model developed previously for electrically neutral polymers in a good solvent. The presented approach merges the power-law scaling concepts of de Gennes with the idea of exponential length scale dependence of effective viscosity in complex liquids. The result is a simple and applicable description of transport properties of high-salt polyelectrolyte solutions at all length scales, valid for motion of single molecules as well as macroscopic flow of the complex liquid.

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Sozanski, K., Wisniewska, A., Kalwarczyk, T., Sznajder, A., & Holyst, R. (2016). Motion of molecular probes and viscosity scaling in polyelectrolyte solutions at physiological ionic strength. PLoS ONE, 11(8). https://doi.org/10.1371/journal.pone.0161409

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