%0 journal article %@ 0909-0495 %A Wieland, D.C.F., Zander, T., Haramus, V.M., Krywka, C., Dedinaite, A., Claesson, P., Willumeit-Roemer, R. %D 2017 %J Journal of Synchrotron Radiation %N 3 %P 646-652 %R doi:10.1107/S1600577517002648 %T Complex solutions under shear and pressure: a rheometer setup for X-ray scattering experiments %U https://doi.org/10.1107/S1600577517002648 3 %X 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.