A neutron spin echo resolved grazing incidence scattering study of crystallites in organic photovoltaic thin films

We present a structural and dynamical analysis of the influence of NaCl on multilayer stacks of phospholipids on a solid surface. To this end, multilayer stacks of phospholipids (L-α-phosphatidylcholine, abbreviated as SoyPC) are investigated with neutron reflectometry, grazing-incidence small-angle neutron scattering (GISANS) and grazing-incidence neutron-spin echo spectroscopy (GINSES). We show both that the NaCl influence on the structure is predominantly on water-head group interface and also, that the change in dynamics is restricted to an associated change in the inter-plane viscosity. Using this knowledge, it is possible to model the dynamical behavior of a phospholipid membrane in response to a salt concentration of the solvent using only a single parameter, namely the in-plane viscosity. The excellent agreement with our previously published model also strongly supports the existence of a thermally excited surface mode in phospholipid membranes for close-to-physiological conditions.

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A grazing incidence neutron spin echo study of near surface dynamics in p(MEO2MA-co-OEGMA) copolymer brushes

Colloid & Polymer Science ◽

10.1007/s00396-018-4421-9 ◽

2018 ◽

Vol 296 (12) ◽

pp. 2005-2014 ◽

Cited By ~ 3

Author(s):

Stefan Wellert ◽

Jessica Hübner ◽

Dikran Boyaciyan ◽

Oxana Ivanova ◽

Regine von Klitzing ◽

...

Keyword(s):

Spin Echo ◽

Grazing Incidence ◽

Neutron Spin ◽

Surface Dynamics ◽

Near Surface ◽

Neutron Spin Echo ◽

Copolymer Brushes

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Dynamics of caged microemulsion droplets: a neutron spin echo and dynamic light scattering study

Physica B Condensed Matter ◽

10.1016/j.physb.2004.04.026 ◽

2004 ◽

Vol 350 (1-3) ◽

pp. 200-203 ◽

Cited By ~ 7

Author(s):

Arnaud de Geyer ◽

Boris Molle ◽

Colette Lartigue ◽

Armel Guillermo ◽

Bela Farago

Keyword(s):

Light Scattering ◽

Dynamic Light Scattering ◽

Spin Echo ◽

Neutron Spin ◽

Neutron Spin Echo ◽

Scattering Study

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Comparison of dynamical theory and phase-object approximation for neutron scattering from periodic structures

Journal of Applied Crystallography ◽

10.1107/s0021889811032730 ◽

2011 ◽

Vol 44 (5) ◽

pp. 958-965 ◽

Cited By ~ 3

Author(s):

Rana Ashkar ◽

V. O. de Haan ◽

A. A. van Well ◽

R. Dalgliesh ◽

J. Plomp ◽

...

Keyword(s):

Neutron Scattering ◽

Periodic Structures ◽

Good Description ◽

Spin Echo ◽

Diffraction Gratings ◽

Grazing Incidence ◽

Dynamical Theory ◽

Neutron Spin ◽

Phase Object ◽

Neutron Spin Echo

Dynamical theory (DT) calculations have been successfully developed to explain neutron spin-echo resolved grazing-incidence scattering from diffraction gratings. The theory, without any adjustable parameters, has been shown in previous publications to accurately reproduce the sensitivity of the spin-echo polarization signal to sample specifications and scattering geometry. The phase-object approximation (POA), which is computationally less demanding than the DT, has also been used to analyze neutron spin-echo polarization data obtained from diffraction gratings. In this paper, POA and DT calculations are compared for neutron scattering from various diffraction gratings in different geometrical settings. POA gives a good description of the data for transmission cases, where the neutron beam is incident at large angles to the average grating surface. However, for the grazing-incidence reflection cases that were studied, the POA does not fit the data using the independently determined dimensions of the measured gratings. On the other hand, the good agreement between dynamical theory and the data from gratings with known profiles paves the way for its use to extract profile information from periodic samples with unknown structures.

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