Combined Measurement of Translational and Rotational Motion of Nanocrystals using Coherent X-rays

在这个研究项目中，我们发展了一种利用准单色和准相干X射线来观测软物质中纳米晶体的平移和转动运动的实验技术。当相干X射线照射样品时，观察到被称为散斑的颗粒状散射图案。通过分析散斑强度的时间涨落，可以获得关于纳米晶体平移运动的信息。通过跟踪纳米晶体衍射点的运动，分析了纳米晶体的旋转运动。通过结合这些技术，我们成功地分析了结晶炭黑纳米粒子在丁苯橡胶中的复杂动力学。这项研究为利用X射线作为微观流变学的探针开辟了可能性。

In this research project, we have developed an experimental technique for the observation of translational and rotational motion of nanocrystals in soft matter by using quasi-monochromatic and quasi-coherent X-rays. When coherent X-rays illuminates samples, granular scattering patterns called speckle are observed. By analyzing temporal fluctuation of the speckle intensity, information on the translational motion of nanocrystals can be obtained. Rotational motion of nanocrystals is analyzed by tracking the movement of diffraction spots from nanocrystals. By combining these techniques, we have successfully analyzed complex dynamics of crystalline carbon black nanoparticles in styrene-butadiene rubber. This study opens up the possibility of using X-rays as a probe of microrheology.