Journal Article

PUBDB-2025-01270

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Phase behavior of Silica-PNIPAm nanogels under high hydrostatic pressure

Striker, N. (Corresponding author)DESY* ; Krywka, C.Extern*HZG*Hereon* ; Goy, C.DESY* ; Hoevelmann, S. C.Extern* ; Giesselmann, N. C.Extern*DESY* ; Schulz, F.Extern* ; Lokteva, I.XFEL.EU* ; Westermeier, F.XFEL.EU*DESY* ; Caupin, F.Extern* ; Paulus, M.Extern* ; Lehmkühler, F. (Corresponding author)XFEL.EU*DESY*

2025
Munksgaard Copenhagen

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Please use a persistent id in citations: doi:10.1107/S1600576725003188  doi:10.3204/PUBDB-2025-01270

Abstract: The structure and dynamics of concentrated silica-PNIPAm nanogels are studied as a function of hydrostatic pressure up to 3500 bar. A combination of X-ray photon correlation spectroscopy and small-angle X-ray scattering shows similar characteristics of the dynamics for both temperature- and pressure-induced volume phase transitions of PNIPAm nanogels. Upon increasing the pressure and depending on the initial particle volume fraction, a transition from a liquid or glass state to a colloidal gel is observed for pressures $p \approx 1500$ bar at a temperature of 293 K. Time-dependent analysis of the dynamics shows ageing in glass and gel samples which is absent in the liquid state. This indicates stress-dominated dynamics upon pressure changes that equilibrate after few 100 s.

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Contributing Institute(s):

1. Spectroscopy of molecular processes (FS-SMP)
2. PETRA-S (FS-PETRA-S)
3. Helmholtz-Zentrum Hereon (Hereon)
4. DOOR-User (DOOR ; HAS-User)

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. AIM, DFG project G:(GEPRIS)390715994 - EXC 2056: CUI: Advanced Imaging of Matter (390715994) (390715994)
4. FS-Proposal: I-20221104 EC (I-20221104-EC) (I-20221104-EC)

Experiment(s):

1. PETRA Beamline P10 (PETRA III)

Appears in the scientific report 2025

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Database coverage:
; ; ; Clarivate Analytics Master Journal List ; Current Contents - Physical, Chemical and Earth Sciences ; DEAL Wiley ; Ebsco Academic Search ; Essential Science Indicators ; IF >= 5 ; JCR ; Nationallizenz ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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