TY  - CONF
AU  - Frielinghaus, Henrich
TI  - Structure and Dynamics at the solid-liquid interface
PB  - Ibaraki U
M1  - FZJ-2018-03763
PY  - 2018
AB  - Microemulsions and lipid bilayer stacks have been studied adjacent to the solid hydrophobic interface using grazing incidence small angle neutron scattering (GISANS), grazing incidence neutron spin echo spectroscopy (GINSES), and neutron reflectometry (NR). The microemulsions display lamellar order while the structure is bicontinuous in the bulk [1]. The dynamics at the interface are approx. three times faster than in the bulk [2]. This coincides with the lubrication effect that describes the facilitated flow of the lamellar structure along the interface. The whole scenario was taken to a volume sample where interfaces were introduced by clay particles (at approx. 1% vol. content). Small platelets induce a rather weakly ordered lamellar structure while the large platelets have a well-ordered lamellar structure at the interface [3]. In rheology experiments the quality of the lamellar structure can be monitored as higher and lower viscosities, and therefore is a macroscopic confirmation of the lubrication effect [4]. For some examples of crude oils we could considerably lower the viscosity using clay particles. When the particle content is raised further to 2% to 3%vol, the lamellar order prevails, and the capillary condensation phase transition for microemulsions is observed [5]. The lipid bilayer system displays lamellar order at low concentrations of a disturbing molecule ibuprofen. The structure can turn to hexagonal when high concentrations of ibuprofen are added [6]. The lamellar system displays an astonishing viscoelastic behavior on the nanosecond timescale when applying GINSES [7]. This behavior is explained using a theory for lamellar stacks at an interface. Viscoelasticity of membrane stacks is highly interesting for mammalian joints where shocks could be dissipated over larger areas.All in all this rich information about near surface dynamics became accessible using a neutron resonator [8], which enhances the neutron wave field in the sample and, therefore, the scattering intensity for these difficult experiments.Keywords: GISANS, GINSES, Near Surface Structure and Dynamics, Boundary Condition, Industrial ApplicationsReferences[1] M. Kerscher et al. Phys. Rev. E 2011, 83, 030401.[2] H. Frielinghaus et al. Phys. Rev. E 2012, 85, 041408.[3] F. Lipfert et al. Nanoscale 2015, 7, 2578.[4] M. Gvaramia et al. arXiv 2018, 1709.05198 & submitted to Sci. Reports 2018.[5] M. Gvaramia et al. submitted to J. Coll. Interf. Sci. 2018.[6] S. Jaksch et al. Phys. Rev. E 2015, 91, 022716.[7] S. Jaksch et al. Sci. Reports 2017, 7, 4417.[8] H. Frielinghaus et al. Nucl. Instr. Meth. Phys. Res. A 2017, 871, 71.
T2  - 3rd Internatoinal Symposium of Quantum Beam Science at Ibaraki University,
CY  - 30 May 2018 - 2 Jun 2018, Mito (Japan)
Y2  - 30 May 2018 - 2 Jun 2018
M2  - Mito, Japan
LB  - PUB:(DE-HGF)6
UR  - https://juser.fz-juelich.de/record/849584
ER  -