Effect of Particle Sizes on the Efficiency of Fluorinated Nanodiamond Neutron Reflectors

Over a decade ago, it was confirmed that detonation nanodiamond (DND) powders reflect very cold neutrons (VCNs) diffusively at any incidence angle and that they reflect cold neutrons quasi-specularly at small incidence angles. In the present publication, we report the results of a study on the effec...

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Autores principales:	Aleksander Aleksenskii, Marcus Bleuel, Alexei Bosak, Alexandra Chumakova, Artur Dideikin, Marc Dubois, Ekaterina Korobkina, Egor Lychagin, Alexei Muzychka, Grigory Nekhaev, Valery Nesvizhevsky, Alexander Nezvanov, Ralf Schweins, Alexander Shvidchenko, Alexander Strelkov, Kylyshbek Turlybekuly, Alexander Vul’, Kirill Zhernenkov
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	detonation nanodiamonds nanopowder reflectors of slow neutrons albedo size separation of nanodiamonds fluorination Chemistry QD1-999
Acceso en línea:	https://doaj.org/article/72942fe0cf7648abb32763dfce8b7410
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spelling	oai:doaj.org-article:72942fe0cf7648abb32763dfce8b74102021-11-25T18:32:11ZEffect of Particle Sizes on the Efficiency of Fluorinated Nanodiamond Neutron Reflectors10.3390/nano111130672079-4991https://doaj.org/article/72942fe0cf7648abb32763dfce8b74102021-11-01T00:00:00Zhttps://www.mdpi.com/2079-4991/11/11/3067https://doaj.org/toc/2079-4991Over a decade ago, it was confirmed that detonation nanodiamond (DND) powders reflect very cold neutrons (VCNs) diffusively at any incidence angle and that they reflect cold neutrons quasi-specularly at small incidence angles. In the present publication, we report the results of a study on the effect of particle sizes on the overall efficiency of neutron reflectors made of DNDs. To perform this study, we separated, by centrifugation, the fraction of finer DND nanoparticles (which are referred to as S-DNDs here) from a broad initial size distribution and experimentally and theoretically compared the performance of such a neutron reflector with that from deagglomerated fluorinated DNDs (DF-DNDs). Typical commercially available DNDs with the size of ~4.3 nm are close to the optimum for VCNs with a typical velocity of ~50 m/s, while smaller and larger DNDs are more efficient for faster and slower VCN velocities, respectively. Simulations show that, for a realistic reflector geometry, the replacement of DF-DNDs (a reflector with the best achieved performance) by S-DNDs (with smaller size DNDs) increases the neutron albedo in the velocity range above ~60 m/s. This increase in the albedo results in an increase in the density of faster VCNs in such a reflector cavity of up to ~25% as well as an increase in the upper boundary of the velocities of efficient VCN reflection.Aleksander AleksenskiiMarcus BleuelAlexei BosakAlexandra ChumakovaArtur DideikinMarc DuboisEkaterina KorobkinaEgor LychaginAlexei MuzychkaGrigory NekhaevValery NesvizhevskyAlexander NezvanovRalf SchweinsAlexander ShvidchenkoAlexander StrelkovKylyshbek TurlybekulyAlexander Vul’Kirill ZhernenkovMDPI AGarticledetonation nanodiamondsnanopowderreflectors of slow neutronsalbedosize separation of nanodiamondsfluorinationChemistryQD1-999ENNanomaterials, Vol 11, Iss 3067, p 3067 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	detonation nanodiamonds nanopowder reflectors of slow neutrons albedo size separation of nanodiamonds fluorination Chemistry QD1-999
spellingShingle	detonation nanodiamonds nanopowder reflectors of slow neutrons albedo size separation of nanodiamonds fluorination Chemistry QD1-999 Aleksander Aleksenskii Marcus Bleuel Alexei Bosak Alexandra Chumakova Artur Dideikin Marc Dubois Ekaterina Korobkina Egor Lychagin Alexei Muzychka Grigory Nekhaev Valery Nesvizhevsky Alexander Nezvanov Ralf Schweins Alexander Shvidchenko Alexander Strelkov Kylyshbek Turlybekuly Alexander Vul’ Kirill Zhernenkov Effect of Particle Sizes on the Efficiency of Fluorinated Nanodiamond Neutron Reflectors
description	Over a decade ago, it was confirmed that detonation nanodiamond (DND) powders reflect very cold neutrons (VCNs) diffusively at any incidence angle and that they reflect cold neutrons quasi-specularly at small incidence angles. In the present publication, we report the results of a study on the effect of particle sizes on the overall efficiency of neutron reflectors made of DNDs. To perform this study, we separated, by centrifugation, the fraction of finer DND nanoparticles (which are referred to as S-DNDs here) from a broad initial size distribution and experimentally and theoretically compared the performance of such a neutron reflector with that from deagglomerated fluorinated DNDs (DF-DNDs). Typical commercially available DNDs with the size of ~4.3 nm are close to the optimum for VCNs with a typical velocity of ~50 m/s, while smaller and larger DNDs are more efficient for faster and slower VCN velocities, respectively. Simulations show that, for a realistic reflector geometry, the replacement of DF-DNDs (a reflector with the best achieved performance) by S-DNDs (with smaller size DNDs) increases the neutron albedo in the velocity range above ~60 m/s. This increase in the albedo results in an increase in the density of faster VCNs in such a reflector cavity of up to ~25% as well as an increase in the upper boundary of the velocities of efficient VCN reflection.
format	article
author	Aleksander Aleksenskii Marcus Bleuel Alexei Bosak Alexandra Chumakova Artur Dideikin Marc Dubois Ekaterina Korobkina Egor Lychagin Alexei Muzychka Grigory Nekhaev Valery Nesvizhevsky Alexander Nezvanov Ralf Schweins Alexander Shvidchenko Alexander Strelkov Kylyshbek Turlybekuly Alexander Vul’ Kirill Zhernenkov
author_facet	Aleksander Aleksenskii Marcus Bleuel Alexei Bosak Alexandra Chumakova Artur Dideikin Marc Dubois Ekaterina Korobkina Egor Lychagin Alexei Muzychka Grigory Nekhaev Valery Nesvizhevsky Alexander Nezvanov Ralf Schweins Alexander Shvidchenko Alexander Strelkov Kylyshbek Turlybekuly Alexander Vul’ Kirill Zhernenkov
author_sort	Aleksander Aleksenskii
title	Effect of Particle Sizes on the Efficiency of Fluorinated Nanodiamond Neutron Reflectors
title_short	Effect of Particle Sizes on the Efficiency of Fluorinated Nanodiamond Neutron Reflectors
title_full	Effect of Particle Sizes on the Efficiency of Fluorinated Nanodiamond Neutron Reflectors
title_fullStr	Effect of Particle Sizes on the Efficiency of Fluorinated Nanodiamond Neutron Reflectors
title_full_unstemmed	Effect of Particle Sizes on the Efficiency of Fluorinated Nanodiamond Neutron Reflectors
title_sort	effect of particle sizes on the efficiency of fluorinated nanodiamond neutron reflectors
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/72942fe0cf7648abb32763dfce8b7410
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Effect of Particle Sizes on the Efficiency of Fluorinated Nanodiamond Neutron Reflectors

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