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@INPROCEEDINGS{Frielinghaus:1034076,
      author       = {Frielinghaus, Henrich},
      title        = {{S}tructure and dynamics of a quasi-binary liquid in 2 and
                      3 dimensions},
      reportid     = {FZJ-2024-06897},
      year         = {2024},
      abstract     = {We investigated a quasi-binary liquid of 3-methyl pyridine
                      and heavy water at the critical composition at different
                      temperatures close to the phase transition. When adding
                      antagonistic salt sodium tetraphenylborate the ions form
                      locally lamellar structures that enclose the binary fluid.
                      Then the system becomes 2-dimensional. Looking at the
                      critical fluctuations, the dimensionality is confirmed. The
                      dynamics of the 3 and 2-dimensional system displays
                      diffusion on large length scales (dynamic light scattering)
                      and fluctuations of the boundaries between the domains on
                      small length scales (neutron spin echo spectroscopy). From
                      that we obtain a master curve following the theory of
                      Kawasaki. On the one hand the critical exponent is obtained
                      that can be rationalized by theoretical concepts. The
                      overall prefactor of the master curve displays approx. 2
                      times faster diffusion for the 2-dimensional compared to the
                      3-dimensional system. This can be explained by much lower
                      viscosities (also measured) of the 2-dimensional system.
                      This is theoretically explained by the lubrication
                      effect.Looking at the high- scattering, we determined the
                      critical correlation-function exponent that is
                      extraordinarily large for the 2-dimensional system. It seems
                      that the composition fluctuations in the 2 dimensions and
                      the 3rd dimension are orientationally averaged.A short
                      excursion will also look on an aerogel as porous material
                      that interferes with the binary fluid.},
      month         = {Dec},
      date          = {2024-12-05},
      organization  = {MLZ User Meeting 2024, Munich
                       (Germany), 5 Dec 2024 - 6 Dec 2024},
      subtyp        = {Outreach},
      cin          = {JCNS-FRM-II / JCNS-4 / MLZ},
      cid          = {I:(DE-Juel1)JCNS-FRM-II-20110218 /
                      I:(DE-Juel1)JCNS-4-20201012 / I:(DE-588b)4597118-3},
      pnm          = {6G4 - Jülich Centre for Neutron Research (JCNS) (FZJ)
                      (POF4-6G4) / 632 - Materials – Quantum, Complex and
                      Functional Materials (POF4-632)},
      pid          = {G:(DE-HGF)POF4-6G4 / G:(DE-HGF)POF4-632},
      experiment   = {EXP:(DE-MLZ)NOSPEC-20140101},
      typ          = {PUB:(DE-HGF)6},
      url          = {https://juser.fz-juelich.de/record/1034076},
}