TY  - JOUR
AU  - Striker, Nele
AU  - Krywka, Christina
AU  - Goy, Claudia
AU  - Hoevelmann, Svenja Carolin
AU  - Giesselmann, Niels Christian
AU  - Schulz, Florian
AU  - Lokteva, Irina
AU  - Westermeier, Fabian
AU  - Caupin, Frederic
AU  - Paulus, Michael
AU  - Lehmkühler, Felix
TI  - Phase behavior of Silica-PNIPAm nanogels under high hydrostatic pressure
JO  - Journal of applied crystallography
VL  - 58
IS  - 3
SN  - 0021-8898
CY  - Copenhagen
PB  - Munksgaard
M1  - PUBDB-2025-01270
SP  - 919 - 926
PY  - 2025
AB  - 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.
LB  - PUB:(DE-HGF)16
DO  - DOI:10.1107/S1600576725003188
UR  - https://bib-pubdb1.desy.de/record/626048
ER  -