SKM 2021 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

DY 5: Poster Session III: Statistical Physics, Complex Fluids and Soft Matter

DY 5.13: Poster

Dienstag, 28. September 2021, 17:30–19:30, P

Microsecond XPCS on soft matter probed at the European XFEL — •Francesco Dallari and Felix Lehmkühler — Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany

Many soft-matter systems are composed of nanoparticles or macromolecules dispersed in water. The characteristic time at the relevant length-scales of few nanometers falls therefore in the (sub)microsecond time-scales, making the measurement of the dynamical properties for these system an extremely challenging (often impossible) task at third generation synchrotron light sources. With the recent development of hard X-ray free electron lasers (XFELs) and fourth generation light sources, time-resolved experiments in this time- and length-scale regimes have become accessible. Here we present the first results on prototypical charge-stabilized silica nanoparticles dispersed in water both in diluted [1] and concentrated [2] systems. Tuning the pulse fluence we are able to probe and describe with thermodynamical models the diffusion properties in stationary systems and in systems driven by the XFEL pulses.

Bibliography:

[1] F. Lehmkühler, F. Dallari, A. Jain, et al. (2020). PNAS, 117, 24110-24116. https://doi.org/10.1073/pnas.2003337117

[2] F. Dallari, ,A. Jain, F. Lehmkühler, et al. (2021). IUCrJ 8, https://doi.org/10.1107/S2052252521006333.