Neutron diffraction from superparamagnetic colloidal crystals

被引：4

作者：

Licen, M. ^{[1
]}

Drevensek-Olenik, I. ^{[1
,2
]}

Coga, L. ^{[2
]}

Gyergyek, S. ^{[3
]}

Kralj, S. ^{[3
,4
]}

Fally, M. ^{[5
]}

Pruner, C. ^{[6
]}

Geltenbort, P. ^{[7
]}

Gasser, U. ^{[8
]}

Nagy, G. ^{[8
]}

Klepp, J. ^{[5
]}

机构：

[1] Jozef Stefan Inst, Dept Complex Matter, Jamova 39, SI-1000 Ljubljana, Slovenia

[2] Univ Ljubljana, Fac Math & Phys, Jadranska 19, SI-1000 Ljubljana, Slovenia

[3] Jozef Stefan Inst, Dept Mat Synth, Jamova 39, SI-1000 Ljubljana, Slovenia

[4] Nanos Sci Doo, Nanos SCI, Teslova 30, Ljubljana 1000, Slovenia

[5] Univ Vienna, Fac Phys, A-1090 Vienna, Austria

[6] Univ Salzburg, Dept Chem & Phys Mat, A-5020 Salzburg, Austria

[7] Inst Laue Langevin, CS 20156, F-38042 Grenoble 9, France

[8] Paul Scherrer Inst, Lab Neutron Scattering & Imaging, CH-5232 Villigen, Switzerland

来源：

JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS | 2017年 / 110卷

关键词：

Colloidal crystals; Superparamagnetic nanoparticles; Neutron scattering; PHOTONIC CRYSTALS; ANGLE; SCATTERING;

D O I：

10.1016/j.jpcs.2017.05.002

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

We fabricated a superparamagnetic ordered structure via self-assembly of a colloidal crystal from a suspension of maghemite nanoparticles and polystyrene beads. Such crystals are potential candidates for novel polarizing beam-splitters for cold neutrons, complementing the available methods of neutron polarization. Different bead sizes and nanoparticle concentrations were tested to obtain a crystal of reasonable quality. Neutron diffraction experiments in the presence of an external magnetic field were performed on the most promising sample. We demonstrate that the diffraction efficiency of such crystals can be controlled by the magnetic field. Our measurements also indicate that the Bragg diffraction regime can be reached with colloidal crystals.

引用

页码：234 / 240

页数：7

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