TY  - JOUR
AU  - Frielinghaus, Henrich
AU  - Dubey, Purushottam
AU  - Wu, Baohu
AU  - Odom, Mary
AU  - Zheng, Feifei
AU  - Shin, Eunjoo
AU  - Zolnierczuk, Piotr
AU  - Holderer, Olaf
AU  - Förster, Stephan
AU  - Heiden-Hecht, Theresia
TI  - Experimental critical dynamics of 3-methyl pyridine/D$_2$O mixtures without and with antagonistic salt
JO  - Physical review research
VL  - 5
IS  - 2
SN  - 2643-1564
CY  - College Park, MD
PB  - APS
M1  - FZJ-2023-01741
SP  - 023053
PY  - 2023
AB  - We observed the criticality in the structure and dynamics of a 3d- and 2d-Ising system consisting of 3-methyl pyridine (3MP) / D2O without and with antagonistic salt. We could describe both dynamic criticalities by the Kawasaki crossover function. The dynamic critical exponent was z=0.063±0.020 and 0.005±0.019 for 3 and 2 dimensions, which confirms earlier observations in the 3d case and confirms expectations in the 2d case. The amplitudes of the critical dynamics are governed by the bare viscosities experimentally, and by the coefficient R theoretically (latter is proportional to (4−d)−1 with the dimensionality d). This finding is in accordance with the lubrication effect that is also connected to lamellar systems of the Brazovskii criticality . This lubrication effect is tightly connected to a laminar flow enforced by the domain structure and also holds for our 2d-Ising system. The experimental techniques employed were small angle neutron and x-rays scattering (SANS and SAXS) for the static criticality and dynamic light scattering (DLS) and neutron spin echo spectroscopy (NSE) for the critical dynamics. Furthermore, the criticality of the viscosities was measured.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000981072100001
DO  - DOI:10.1103/PhysRevResearch.5.023053
UR  - https://juser.fz-juelich.de/record/1006604
ER  -