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Updated: Mar 3, 2026

Studying Large Amplitude Oscillatory Shear Response of Soft Materials
Published on: April 25, 2019
Complex solutions under shear and pressure: a rheometer setup for X-ray scattering experiments
D C F Wieland1, T Zander1, V M Garamus1
1Institute for Materials Research, Helmholtz Zentrum Geesthacht, Max-Planck-Strasse 1, Geesthacht 21502, Germany.
Abstract:
A newly developed high-pressure rheometer for in situ X-ray scattering experiments is described. A commercial rheometer was modified in such a way that X-ray scattering experiments can be performed under different pressures and shear. First experiments were carried out on hyaluronan, a ubiquitous biopolymer that is important for different functions in the body such as articular joint lubrication. The data hint at a decreased electrostatic interaction at higher pressure, presumably due to the increase of the dielectric constant of water by 3% and the decrease of the free volume at 300 bar.
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