Journal Article

PUBDB-2024-00817

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Real-time swelling-collapse kinetics of nanogels driven by XFEL pulses

Dallari, F. (Corresponding author)XFEL.EU*DESY* ; Lokteva, I.XFEL.EU*DESY* ; Moeller, J.XFEL.EU* ; Roseker, W.XFEL.EU*DESY* ; Goy, C.DESY* ; Westermeier, F.XFEL.EU*DESY* ; Boesenberg, U.XFEL.EU* ; Hallmann, J.XFEL.EU* ; Rodriguez-Fernandez, A.XFEL.EU* ; Scholz, M.XFEL.EU*DESY* ; Shayduk, R.XFEL.EU* ; Madsen, A.XFEL.EU* ; Gruebel, G.XFEL.EU*DESY* ; Lehmkühler, F. (Corresponding author)XFEL.EU*DESY*

2024
Assoc. Washington, DC [u.a.]

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Please use a persistent id in citations: doi:10.1126/sciadv.adm7876  doi:10.3204/PUBDB-2024-00817

Abstract: Stimuli-responsive polymers are an important class of materials with many applications in nanotechnology and drug delivery. The most prominent one is poly-N-isopropylacrylamide (PNIPAm). The characterization of the kinetics of its change after a temperature jump is still a lively research topic, especially at nanometer-length scales where it is not possible to rely on conventional microscopic techniques. Here, we measured in real time the collapse of a PNIPAm shell on silica nanoparticles with megahertz x-ray photon correlation spectroscopy at the European XFEL. We characterize the changes of the particles diffusion constant as a function of time and consequently local temperature on sub-microsecond timescales. We developed a phenomenological model to describe the observed data and extract the characteristic times associated to the swelling and collapse processes. Different from previous studies tracking the turbidity of PNIPAm dispersions and using laser heating, we find collapse times below microsecond timescales and two to three orders of magnitude slower swelling times.

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Contributing Institute(s):

1. Spectroscopy of molecular processes (FS-SMP)
2. Coherent X-ray Scattering (FS-CXS)
3. PETRA-S (FS-PETRA-S)
4. MID (XFEL_E1_MID)

Research Program(s):

1. 633 - Life Sciences – Building Blocks of Life: Structure and Function (POF4-633) (POF4-633)
2. 6G3 - PETRA III (DESY) (POF4-6G3) (POF4-6G3)
3. DFG project 194651731 - EXC 1074: Hamburger Zentrum für ultraschnelle Beobachtung (CUI): Struktur, Dynamik und Kontrolle von Materie auf atomarer Skala (194651731) (194651731)
4. DFG project 390715994 - EXC 2056: CUI: Advanced Imaging of Matter (390715994) (390715994)

Experiment(s):

1. MID: Materials Imaging and Dynamics (SASE2)
2. PETRA Beamline P10 (PETRA III)

Appears in the scientific report 2024

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