Journal Article

FZJ-2023-01741

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Experimental critical dynamics of 3-methyl pyridine/D$_2$O mixtures without and with antagonistic salt

Frielinghaus, H. (Corresponding author)FZJ* ; Dubey, P.FZJ* ; Wu, B.FZJ* ; Odom, M. ; Zheng, F. ; Shin, E. ; Zolnierczuk, P. ; Holderer, O.FZJ* ; Förster, S.FZJ* ; Heiden-Hecht, T.FZJ*

2023
APS College Park, MD

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Please use a persistent id in citations: http://hdl.handle.net/2128/34403  doi:10.1103/PhysRevResearch.5.023053

Abstract: 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.

Keyword(s): Polymers, Soft Nano Particles and Proteins (1st) ; Soft Condensed Matter (2nd)

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Contributing Institute(s):

1. JCNS-FRM-II (JCNS-FRM-II)
2. JCNS-4 (JCNS-4)
3. Neutronenstreuung (JCNS-1)
4. Heinz Maier-Leibnitz Zentrum (MLZ)

Research Program(s):

1. 6G4 - Jülich Centre for Neutron Research (JCNS) (FZJ) (POF4-6G4) (POF4-6G4)
2. 632 - Materials – Quantum, Complex and Functional Materials (POF4-632) (POF4-632)

Experiment(s):

1. KWS-X: SAXS-WAXS laboratory beamline

Appears in the scientific report 2023

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Database coverage:
; ; ; ; Article Processing Charges ; Clarivate Analytics Master Journal List ; DOAJ Seal ; Emerging Sources Citation Index ; Fees ; IF < 5 ; JCR ; SCOPUS ; Web of Science Core Collection

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