Wieland D C F, Zander T, Garamus V M, Krywka C, Dedinaite A, Claesson P, Willumeit-Römer R
Institute for Materials Research, Helmholtz Zentrum Geesthacht, Max-Planck-Strasse 1, Geesthacht 21502, Germany.
Department of Chemistry, Surface and Corrosion Science, KTH Royal Institute of Technology, Drottning Kristinas väg 51, Stockholm 10044, Sweden.
J Synchrotron Radiat. 2017 May 1;24(Pt 3):646-652. doi: 10.1107/S1600577517002648. Epub 2017 Mar 22.
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.
本文描述了一种新开发的用于原位X射线散射实验的高压流变仪。对一台商用流变仪进行了改造，使其能够在不同压力和剪切条件下进行X射线散射实验。首次实验是在透明质酸上进行的，透明质酸是一种普遍存在的生物聚合物，对身体的不同功能（如关节润滑）很重要。数据表明，在较高压力下，静电相互作用减弱，这可能是由于水的介电常数增加了3%以及在300巴时自由体积减小所致。
