scholarly journals Aligning self-assembled perylene bisimides in a magnetic field

2018 ◽  
Vol 54 (78) ◽  
pp. 10977-10980 ◽  
Author(s):  
Emily R. Draper ◽  
Matthew Wallace ◽  
Dirk Honecker ◽  
Dave J. Adams
Keyword(s):  
Magnetic Field ◽  
Thin Films ◽  
Neutron Scattering ◽  
Small Angle ◽  
Small Angle Neutron Scattering ◽  
Electrochemical Techniques ◽  
Perylene Bisimide ◽  
Self Assembled ◽  
Perylene Bisimides

Directional dependent photoresponsive perylene bisimide thin films can be made by aligning and drying under a magnetic field. This can be monitored by NMR and small angle neutron scattering and assessed by imaging and electrochemical techniques.

scholarly journals Feasibility of Probing the Filler Restructuring in Magnetoactive Elastomers by Ultra-Small-Angle Neutron Scattering

2021 ◽  
Vol 11 (10) ◽  
pp. 4470
Author(s):  
Inna A. Belyaeva ◽  
Jürgen Klepp ◽  
Hartmut Lemmel ◽  
Mikhail Shamonin
Keyword(s):  
Magnetic Field ◽  
Neutron Scattering ◽  
Small Angle ◽  
Small Angle Neutron Scattering ◽  
Iron Particles ◽  
Filler Particles ◽  
The Magnetic Field ◽  
Magnetoactive Elastomer

Ultra-small-angle neutron scattering (USANS) experiments are reported on isotropic magnetoactive elastomer (MAE) samples with different concentrations of micrometer-sized iron particles in the presence of an in-plane magnetic field up to 350 mT. The effect of the magnetic field on the scattering curves is observed in the scattering vector range between 2.5 × 10−5 and 1.85 × 10−4 Å−1. It is found that the neutron scattering depends on the magnetization history (hysteresis). The relation of the observed changes to the magnetic-field-induced restructuring of the filler particles is discussed. The perspectives of employing USANS for investigations of the internal microstructure and its changes in magnetic field are considered.

scholarly journals Quantitative 3D determination of self-assembled structures on nanoparticles using small angle neutron scattering

2018 ◽  
Vol 9 (1) ◽  
Author(s):  
Zhi Luo ◽  
Domenico Marson ◽  
Quy K. Ong ◽  
Anna Loiudice ◽  
Joachim Kohlbrecher ◽  
...  
Keyword(s):  
Neutron Scattering ◽  
Small Angle ◽  
Small Angle Neutron Scattering ◽  
Self Assembled

scholarly journals Magnetic field dependent small-angle neutron scattering on a Co nanorod array: evidence for intraparticle spin misalignment

2014 ◽  
Vol 47 (3) ◽  
pp. 992-998 ◽  
Author(s):  
A. Günther ◽  
J.-P. Bick ◽  
P. Szary ◽  
D. Honecker ◽  
C. D. Dewhurst ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Neutron Scattering ◽  
Cross Section ◽  
Field Dependence ◽  
Small Angle ◽  
Small Angle Neutron Scattering ◽  
Strong Field ◽  
Structural Parameters ◽  
Nanorod Array ◽  
Field Dependent

The structural and magnetic properties of a cobalt nanorod array have been studied by means of magnetic field dependent small-angle neutron scattering (SANS). Measurement of the unpolarized SANS cross section dΣ/dΩ of the saturated sample in the two scattering geometries where the applied magnetic fieldHis either perpendicular or parallel to the wavevectorkiof the incoming neutron beam allows one to separate nuclear from magnetic SANS, without employing the usual sector-averaging procedure. The analysis of the SANS data in the saturated state provides structural parameters (rod radius and centre-to-centre distance) that are in good agreement with results from electron microscopy. Between saturation and the coercive field, a strong field dependence of dΣ/dΩ is observed (in both geometries), which cannot be explained using the conventional expression of the magnetic SANS cross section of magnetic nanoparticles in a homogeneous nonmagnetic matrix. The origin of the strong field dependence of dΣ/dΩ is believed to be related to intradomain spin misalignment, due to magnetocrystalline and magnetoelastic anisotropies and magnetostatic stray fields.

scholarly journals First Experiment of Spin Contrast Variation Small-Angle Neutron Scattering on the iMATERIA Instrument at J-PARC

2020 ◽  
Vol 4 (4) ◽  
pp. 33 ◽  
Author(s):  
Yohei Noda ◽  
Tomoki Maeda ◽  
Takayuki Oku ◽  
Satoshi Koizumi ◽  
Tomomi Masui ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Neutron Scattering ◽  
Small Angle ◽  
Small Angle Neutron Scattering ◽  
Coherent Scattering ◽  
Proton Spin ◽  
Neutron Polarization ◽  
Stray Magnetic Field ◽  
Beam Experiment ◽  
Neutron Wavelength

Recently, we have developed a novel dynamic nuclear polarization (DNP) apparatus with a magnetic field of 7 T and a sample temperature of 1 K. High proton spin polarizations from −84% to 76%, for TEMPO doped polystyrene samples, have been demonstrated. This DNP apparatus satisfies the simultaneous requirement for quick and easy sample exchange and high DNP performance. On the iMATERIA (BL20) instrument at J-PARC, the first beam experiment using this DNP apparatus has been performed. For this experiment, the beamline was equipped with a supermirror polarizer. The stray magnetic field due to the superconducting magnet for DNP was also evaluated. The stray magnetic field plays an important role for in maintaining the neutron polarization during the transportation from the polarizer to the sample. The small-angle neutron scattering (SANS) profiles of silica-filled rubber under dynamically polarized conditions are presented. By applying our new analytical approach for SANS coherent scattering intensity, neutron polarization (PN) as a function of neutron wavelength was determined. Consequently, for the neutron wavelength, range from 4 Å to 10 Å, |PN| was sufficient for DNP-SANS studies.

scholarly journals Elucidation of density profile of self-assembled sitosterol + oryzanol tubules with small-angle neutron scattering

2012 ◽  
Vol 158 ◽  
pp. 223 ◽  
Author(s):  
Arjen Bot ◽  
Elliot P. Gilbert ◽  
Wim G. Bouwman ◽  
Hassan Sawalha ◽  
Ruud den Adel ◽  
...  
Keyword(s):  
Neutron Scattering ◽  
Density Profile ◽  
Small Angle ◽  
Small Angle Neutron Scattering ◽  
Self Assembled
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