Dynamics of soft nanoparticle suspensions at hard X-ray FEL sources below the radiation-damage threshold
| Autor: | Felix Lehmkühler, Joana Valerio, Dina Sheyfer, Wojciech Roseker, Martin A. Schroer, Birgit Fischer, Kensuke Tono, Makina Yabashi, Tetsuya Ishikawa, Gerhard Grübel |
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| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: | |
| Zdroj: | IUCrJ, Vol 5, Iss 6, Pp 801-807 (2018) |
| Druh dokumentu: | article |
| ISSN: | 2052-2525 20522525 |
| DOI: | 10.1107/S2052252518013696 |
| Popis: | The application of X-ray photon correlation spectroscopy (XPCS) at free-electron laser (FEL) facilities enables, for the first time, the study of dynamics on a (sub-)nanometre scale in an unreached time range between femtoseconds and seconds. For soft-matter materials, radiation damage is a major limitation when going beyond single-shot applications. Here, an XPCS study is presented at a hard X-ray FEL on radiation-sensitive polymeric poly(N-isopropylacrylamide) (PNIPAM) nanoparticles. The dynamics of aqueous suspensions of densely packed silica-PNIPAM core-shell particles and a PNIPAM nanogel below the radiation-damage threshold are determined. The XPCS data indicate non-diffusive behaviour, suggesting ballistic and stress-dominated heterogeneous particle motions. These results demonstrate the feasibility of XPCS experiments on radiation-sensitive soft-matter materials at FEL sources and pave the way for future applications at MHz repetition rates as well as ultrafast modes using split-pulse devices. |
| Databáze: | Directory of Open Access Journals |
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