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Complex solutions under shear and pressure: a rheometer setup for X‐ray scattering experiments |
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| Authors: | D. C. F. Wieland T. Zander V. M. Garamus C. Krywka A. Dedinaite P. Claesson R. Willumeit-Römer |
| Affiliation: | 1. Institute for Materials Research, Helmholtz Zentrum Geesthacht, Max-Planck-Strasse 1, Geesthacht21502, Germany;2. EMBL Hamburg, Notkestrasse 85, Hamburg22607, Germany;3. Department of Chemistry, Surface and Corrosion Science, KTH Royal Institute of Technology, Drottning Kristinas v?g 51, Stockholm10044, Sweden;4. SP Chemistry, Materials and Surfaces, SP Technical Research Institute of Sweden, Box 5607, StockholmSE-114 86, Sweden |
| 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. |
| Keywords: | rheology pressure small‐angle X‐ray scattering complex solutions hyaluronan |