Translational and Rotational Motion of Nanocrystals in Rubber
ORAL
Abstract
We present the observation of translational and rotational dynamics of carbon-black nanocrystals in styrene-butadien rubber using coherent X-ray scattering. X-ray photon correlation spectroscopy (XPCS) exploits the partial coherence of X-rays to provide the information of microscopic dynamics. In diffracted X-ray tracking (DXT) measurement, the motion of diffraction spots from single nanocrystals is monitored to track their rotational motion. A combination of XPCS and DXT reveals the detailed translational and rotational motion of nanocrystals in a medium. Experimentally XPCS requires a monochromatic beam whereas DXT requires a wide energy range to increase the probability of diffraction spots being on the Ewald sphere shells. This experimental incompatibility can be overcome by using an intense pink beam X-ray that is available using a helical undulator at synchrotron facilities.
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