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@INPROCEEDINGS{Frielinghaus:872680,
      author       = {Frielinghaus, Henrich},
      title        = {{M}icroemulsions at planar surfaces with and without flow},
      school       = {University Stuttgart},
      reportid     = {FZJ-2020-00171},
      year         = {2019},
      abstract     = {Microemulsions consist of water, oil and surfactant.
                      Although thermodynamically stable, domains of pure water and
                      oil are formed on nanometer length scales and a surfactant
                      film in between that are ideally observable by small angle
                      scattering experiments. The bicontinuous microemulsion
                      displays a sponge structure that forms when equal volumes of
                      water and oil are mixed. Being exposed to hydrophilic planar
                      surfaces, a lamellar order is found in the vicinity to the
                      solid-liquid interface. The typical depth of the lamellae is
                      40 to 60nm, i.e. 4 to 6 perfect domains [1,2], before the
                      perforations describe the decay to the bicontinuous phase.
                      The membrane modes observed by neutron spin echo
                      spectroscopy under grazing incidence are faster at the
                      interface than in bulk [3]. This is an evidence for the
                      lubrication effect, a facilitated flow of the lamellae along
                      the interface. Employing clay platelets, the same effect
                      could be observed in a bulk sample [4]. Furthermore, at
                      smaller platelet diameters, the favorable modes of the
                      lamellae were cut, and the overall dynamics slowed down
                      similar to the bulk. Thus, the perfection of modes at the
                      interface is connected to the platelet diameter. At rather
                      high flow rates, the perforated transition region was
                      reduced in size, while the perfect lamellae were persistent
                      [2]. In macroscopic rheology experiments (Fig.1 left), the
                      microemulsion with rather large clay platelets showed
                      evidence for the lubrication effect on macroscopic scales,
                      while at lower clay dimensions the viscosity was
                      extraordinarily high [5] (Fig.1 right). Motivated by this
                      effect, the rheology of crude oils with large clay platelets
                      showed decreased viscosities at low temperatures (below
                      0°C). The dynamic asymmetry of the aromatic and aliphatic
                      portions and the lamellar alignment of the domains may
                      explain these findings.},
      month         = {Sep},
      date          = {2019-09-23},
      organization  = {49th Conference of the German Colloid
                       Society, Stuttgart (Germany), 23 Sep
                       2019 - 25 Sep 2019},
      subtyp        = {Outreach},
      cin          = {JCNS-FRM-II / JCNS-1 / MLZ},
      cid          = {I:(DE-Juel1)JCNS-FRM-II-20110218 /
                      I:(DE-Juel1)JCNS-1-20110106 / I:(DE-588b)4597118-3},
      pnm          = {6G4 - Jülich Centre for Neutron Research (JCNS) (POF3-623)
                      / 6G15 - FRM II / MLZ (POF3-6G15) / 6215 - Soft Matter,
                      Health and Life Sciences (POF3-621)},
      pid          = {G:(DE-HGF)POF3-6G4 / G:(DE-HGF)POF3-6G15 /
                      G:(DE-HGF)POF3-6215},
      experiment   = {EXP:(DE-MLZ)KWS1-20140101 / EXP:(DE-MLZ)KWS3-20140101 /
                      EXP:(DE-MLZ)J-NSE-20140101},
      typ          = {PUB:(DE-HGF)6},
      url          = {https://juser.fz-juelich.de/record/872680},
}