Clustering of Diamond Nanoparticles, Fluorination and Efficiency of Slow Neutron Reflectors

被引：14

作者：

Aleksenskii, Aleksander ^{[1
]}

Bleuel, Markus ^{[2
,3
]}

Bosak, Alexei ^{[4
]}

Chumakova, Alexandra ^{[4
]}

Dideikin, Artur ^{[1
]}

Dubois, Marc ^{[5
]}

Korobkina, Ekaterina ^{[6
]}

Lychagin, Egor ^{[7
,8
,9
]}

Muzychka, Alexei ^{[7
]}

Nekhaev, Grigory ^{[7
]}

Nesvizhevsky, Valery ^{[10
]}

Nezvanov, Alexander ^{[7
]}

Schweins, Ralf ^{[10
]}

Shvidchenko, Alexander ^{[1
]}

Strelkov, Alexander ^{[7
]}

Turlybekuly, Kylyshbek ^{[7
,11
,12
]}

Vul, Alexander ^{[1
]}

Zhernenkov, Kirill ^{[7
,13
]}

机构：

[1] Ioffe Inst, Polytech Skaya Str 26, St Petersburg 194021, Russia

[2] NIST, Gaithersburg, MD 20899 USA

[3] Univ Maryland, Dept Mat Sci & Engn, College Pk, MD 20742 USA

[4] European Synchrotron Radiat Facil, 71 Av Martyrs, F-38042 Grenoble, France

[5] Univ Clermont Auvergne, Inst Chim Clermont Ferrand ICCF UME 6296, CNRS, 24 Av Blaise Pascal, F-63178 Aubiere, France

[6] North Carolina State Univ, Dept Nucl Engn, Raleigh, NC 27695 USA

[7] Joint Inst Nucl Res, 6 Joliot Curie, Dubna 141980, Russia

[8] Lomonosov Moscow State Univ, Fac Phys, GSP-1 Leninskie Gory, Moscow 119991, Russia

[9] Dubna State Univ, Dept Nucl Phys, Univ Skaya 19, Dubna 141982, Russia

[10] Inst Max von Laue Paul Langevin, 71 Av Martyrs, F-38042 Grenoble, France

[11] LN Gumilyov Eurasian Natl Univ, Fac Phys & Technol, Satpayev Str 2, Nur Sultan 010000, Kazakhstan

[12] Minist Energy Republ Kazakhstan, Inst Nucl Phys, Ibragimova Str 1, Alma Ata 050032, Kazakhstan

[13] Forshungzentrum Julich GmbH, JCNS Heinz Maier Leibnitz Zentrum MLZ, 1 Lichtenbergstr, G-85748 Garching, Germany

来源：

NANOMATERIALS | 2021年 / 11卷 / 08期

关键词：

detonation nanodiamonds; nanopowder; reflectors of slow neutrons; albedo; clustering and agglomeration of nanodiamonds; deagglomeration; fluorination; size distribution; Monte Carlo; DETONATION NANODIAMOND; CROSS-SECTION; COLD NEUTRONS; SCATTERING; HYDROGEN; POWDER; CARBON; RANGE;

D O I：

10.3390/nano11081945

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Neutrons can be an instrument or an object in many fields of research. Major efforts all over the world are devoted to improving the intensity of neutron sources and the efficiency of neutron delivery for experimental installations. In this context, neutron reflectors play a key role because they allow significant improvement of both economy and efficiency. For slow neutrons, Detonation NanoDiamond (DND) powders provide exceptionally good reflecting performance due to the combination of enhanced coherent scattering and low neutron absorption. The enhancement is at maximum when the nanoparticle diameter is close to the neutron wavelength. Therefore, the mean nanoparticle diameter and the diameter distribution are important. In addition, DNDs show clustering, which increases their effective diameters. Here, we report on how breaking agglomerates affects clustering of DNDs and the overall reflector performance. We characterize DNDs using small-angle neutron scattering, X-ray diffraction, scanning and transmission electron microscopy, neutron activation analysis, dynamical light scattering, infra-red light spectroscopy, and others. Based on the results of these tests, we discuss the calculated size distribution of DNDs, the absolute cross-section of neutron scattering, the neutron albedo, and the neutron intensity gain for neutron traps with DND walls.

引用

页数：18

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