Millisecond dynamics of colloidal suspension studied by X-ray photon correlation spectroscopy at the Shanghai Synchrotron Radiation Facility

Subjects: Nuclear Science and Technology >> Nuclear Science and Technology submitted time 2023-12-10

Chen-Hui Cui Zimu ZHOU Linfeng WEI Songlin LI Feng TIAN Xiuhong LI Zhi GUO Yihui XU Huaidong JIANG Renzhong TAI

Abstract： X-ray photon correlation spectroscopy (XPCS) has emerged as a powerful tool for probing the nanoscale
dynamics of soft condensed matter and strongly correlated materials owing to its high spatial resolution and
penetration capabilities. This technique requires high brilliance and beam coherence, which are not directly
available at modern synchrotron beamlines in China. To facilitate future XPCS experiments, we modified the
optical setup of the newly commissioned BL10U1 USAXS beamline at the Shanghai Synchrotron Radiation
Facility (SSRF). Subsequently, we performed XPCS measurements on silica suspensions in glycerol, which
were opaque owing to their high concentrations. Images were collected using a high frame rate area detector.
A comprehensive analysis was performed, yielding correlation functions and several key dynamic parameters.
All the results were consistent with the theory of Brownian motion and demonstrated the feasibility of XPCS at
SSRF. Finally, by carefully optimizing the setup and analyzing the algorithms, we achieved a time resolution of
2 ms, which enabled the characterization of millisecond dynamics in opaque systems.

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