Critical overlap concentration and intrinsic viscosity data of xanthan gum aqueous solutions in dimethyl sulfoxide
T. Rodrigues, Francisco J. Galindo‐Rosales, Laura Campo-Deaño
Abstract
This is the supplementary information of the research paper “Haemodynamics around confined microscopic cylinders” by Rodrigues et al. [1]. The critical overlap concentration of entanglement of polymer coils indicates whether a polymer solution is dilute or semidilute. Here, the reader will find the determination of c* for xanthan gum aqueous solutions in 52 wt.% of dimethyl sulfoxide, often used as non-particulate blood analogues. From the shear flow curves of a dilution series of the polymer the zero-shear viscosities η0 were obtained, allowing us to estimate the intrinsic viscosity [η] based on the xanthan gum concentration of the fluids. Two methodologies for doing so are described: using information from multi-concentration measurements and from a single polymer solution (rough estimate). With the intrinsic viscosity the determination of c* is straightforward.