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Ultralight and Superelastic Gd2O3/Bi2O3 Nanofibrous Aerogels with Nacre-Mimetic Brick-Mortar Structure for Superior X-ray Shielding
Nano Letters ( IF 9.6 ) Pub Date : 2022-10-31 , DOI: 10.1021/acs.nanolett.2c03484
Li Xu 1 , Liqian Huang 1 , Jianyong Yu 2 , Yang Si 1, 2 , Bin Ding 1, 2
Affiliation  

The widespread use of X-rays has prompted a surge in demand for effective and wearable shielding materials. However, the Pb-containing materials currently used to shield X-rays are commonly bulky, hard, and biotoxic, severely limiting their applications in wearable scenarios. Inspired by the nacre, we report on ultralight, superelastic, and nontoxic X-ray shielding nanofibrous aerogels with microarch-engineered brick/mortar structure by combining polyurethane/Bi2O3 nanofibers (brick) and Gd2O3 nanosheets (mortar). The synergistic attenuation effect toward X-rays from the reflection of microarches and absorption of Bi/Gd elements significantly enhances the shielding efficiency of aerogels, and microarches/robust nanofibrous networks endow the materials with superelasticity. The resultant materials exhibit integrated properties of superior X-ray shielding efficiency (91–100%), ultralow density (52 mg cm–3), large stretchability of 800% reversible elongation, and high water vapor permeability (8.8 kg m–2 day–1). The fabrication of such novel aerogels paves the way for developing next-generation effective and wearable X-ray shielding materials.

中文翻译:

具有珍珠质仿砖砂浆结构的超轻超弹性 Gd2O3/Bi2O3 纳米纤维气凝胶可实现出色的 X 射线屏蔽

X 射线的广泛使用促使对有效和可穿戴屏蔽材料的需求激增。然而,目前用于屏蔽 X 射线的含铅材料通常体积大、坚硬且具有生物毒性,严重限制了它们在可穿戴场景中的应用。受珍珠母的启发,我们通过结合聚氨酯/Bi 2 O 3纳米纤维(砖)和 Gd 2 O 3报告了具有微拱工程砖/砂浆结构的超轻、超弹性和无毒 X 射线屏蔽纳米纤维气凝胶纳米片(砂浆)。微拱的反射和 Bi/Gd 元素的吸收对 X 射线的协同衰减效应显着提高了气凝胶的屏蔽效率,微拱/坚固的纳米纤维网络赋予材料超弹性。所得材料具有优异的 X 射线屏蔽效率 (91–100%)、超低密度 (52 mg cm –3 )、800% 可逆伸长率的大拉伸性和高水蒸气渗透率 (8.8 kg m –2天) 的综合性能–1)。这种新型气凝胶的制造为开发下一代有效且可穿戴的 X 射线屏蔽材料铺平了道路。
更新日期:2022-10-31
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