%0 Journal Article
%A Striker, Nele
%A Krywka, Christina
%A Goy, Claudia
%A Hoevelmann, Svenja Carolin
%A Giesselmann, Niels Christian
%A Schulz, Florian
%A Lokteva, Irina
%A Westermeier, Fabian
%A Caupin, Frederic
%A Paulus, Michael
%A Lehmkühler, Felix
%T Phase behavior of Silica-PNIPAm nanogels under high hydrostatic pressure
%J Journal of applied crystallography
%V 58
%N 3
%@ 0021-8898
%C Copenhagen
%I Munksgaard
%M PUBDB-2025-01270
%P 919 - 926
%D 2025
%X 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  ≈ 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.
%F PUB:(DE-HGF)16
%9 Journal Article
%R 10.1107/S1600576725003188
%U https://bib-pubdb1.desy.de/record/626048