Foam with direction: unraveling the anisotropic radiation shielding properties of 2D boron nitride nanoplatelet foams

IF 9.1 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

npj 2D Materials and Applications Pub Date : 2024-02-26 DOI:10.1038/s41699-024-00451-2

Kazue Orikasa, Cheol Park, Sang-Hyon Chu, Calista Lum, Tony Thomas, Tyler Dolmetsch, Luiza Benedetti, Arvind Agarwal

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Abstract

Neutron radiation exposure is one of the main challenges faced during space missions. There is a critical need for advanced lightweight radiation shielding materials. Two-dimensional (2D) boron nitride nanoplatelets (BNNP) are excellent candidates for polymer matrix nanofillers due to their superior neutron shielding and thermal and mechanical properties. Furthermore, the 2D material anisotropic behavior unlocks the potential for composite property tailoring. This study fabricated ultra-lightweight lamellar BNNP foams (density 0.05 g cm–3 and 97.5% porous) via freeze-drying processing. The neutron shielding effectiveness or mass absorption coefficient of the BNNP foams with walls perpendicular to the direction of the radiation source was 14.47 cm2 g–1, while that of the foam with parallel configuration was only 8.51 cm2 g–1. The orientation-dependent neutron radiation shielding properties were modeled using the Beer-Lambert law for porous composite materials. The BNNP foam in this study has the potential to benefit advanced tailorable radiation shielding technologies for future aerospace missions.

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有方向的泡沫：揭示二维氮化硼纳米片泡沫的各向异性辐射屏蔽特性

中子辐照是太空任务中面临的主要挑战之一。目前迫切需要先进的轻质辐射屏蔽材料。二维（2D）氮化硼纳米片（BNNP）具有优异的中子屏蔽性能、热性能和机械性能，是聚合物基体纳米填料的绝佳候选材料。此外，二维材料各向异性的行为也为复合材料性能的定制挖掘了潜力。本研究通过冷冻干燥工艺制造了超轻片状 BNNP 泡沫（密度为 0.05 g cm-3，97.5% 多孔性）。壁面垂直于辐射源方向的 BNNP 泡沫的中子屏蔽效能或质量吸收系数为 14.47 cm2 g-1，而平行构型泡沫的中子屏蔽效能或质量吸收系数仅为 8.51 cm2 g-1。多孔复合材料的比尔-朗伯定律模拟了与取向相关的中子辐射屏蔽特性。本研究中的 BNNP 泡沫有望为未来的航空航天任务提供先进的可定制辐射屏蔽技术。

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来源期刊

npj 2D Materials and Applications Engineering-Mechanics of Materials

CiteScore

14.50

自引率

2.10%

发文量

审稿时长

15 weeks

期刊介绍： npj 2D Materials and Applications publishes papers on the fundamental behavior, synthesis, properties and applications of existing and emerging 2D materials. By selecting papers with the potential for impact, the journal aims to facilitate the transfer of the research of 2D materials into wide-ranging applications.