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

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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.