物理化学学报

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稀土-天然皮革可穿戴X射线防护材料的合成及性能

李倩1, 丁平平3, 王亚平1, 廖学品1,2, 石碧1,2   

  1. 1 四川大学生物质科学与工程学院, 成都 610065;
    2 四川大学, 制革清洁技术国家工程实验室, 成都 610065;
    3 成都理工大学成都理工大学核技术与自动化学院, 成都 610059
  • 收稿日期:2020-01-19 修回日期:2020-02-16 录用日期:2020-02-17 发布日期:2020-03-02
  • 通讯作者: 廖学品 E-mail:xpliao@scu.edu.cn
  • 基金资助:
    国家自然科学基金(21878191)资助项目

Preparation of a Rare Earth Natural Leather X-ray Protection Material and Its Properties

Qian Li1, Pingping Ding3, Yaping Wang1, Xuepin Liao1,2, Bi Shi1,2   

  1. 1 College of Biomass Science and Engineering, Sichuan University, Chengdu 610065, P. R. China;
    2 National Engineering Laboratory for Clean Technology of Leather Manufacture, Sichuan University, Chengdu 610065, P. R. China;
    3 Collage of Nuclear Technology and Automation, Chengdu University of Technology, Chengdu 610065, P. R. China
  • Received:2020-01-19 Revised:2020-02-16 Accepted:2020-02-17 Published:2020-03-02
  • Supported by:
    The project was supported by the National Natural Science Foundation of China (21878191).

摘要: 天然皮革(NL)具有质轻、无毒、柔软和可穿戴性好的特点。本文将稀土氧化物纳米粒子(RE)引入天然皮革中制备了稀土-天然皮革复合材料(RE-NL),并考察其X射线屏蔽性能。采用X射线衍射、扫描电子显微镜、透射电子显微镜等方法对所制备的材料进行表征,结果表明,通过制革的"复鞣"方法可成功制得稀土-天然皮革复合材料。对不同稀土天然皮革复合材料进行X射线屏蔽性能测定,发现纳米氧化镧-天然皮革(La-NL)有更优异的屏蔽性能,这是因为其K吸收边能量同X射线入射能量较近。当纳米La2O3在材料中的摩尔含量为7.80 mmol·cm-3时,所制备的La7.80-NL在40-80 keV有优异X射线屏蔽性能,比0.25 mm的铅板(摩尔含量为54.7 mmol·cm-3)具有更好的屏蔽性能,表明稀土在天然皮革中的高度均匀分布增强了其对X射线的屏蔽能力。力学性能测试表明稀土-天然皮革X射线屏蔽材料较高分子聚合物基稀土复合材料具有更好的力学性能和柔软性。

关键词: 天然皮革, 纳米稀土粒子, X射线, 可穿戴防护材料, 衰减效率

Abstract: X-rays are widely used in many fields, including medical imaging, chemical structure analysis, and nondestructive examinations. However, long-term X-ray exposure is harmful to human health. Hence, radiation protection materials, especially wearable materials with outstanding performances, are in need of development. Lead (Pb) plates are commonly used as traditional radiation protection materials but have the disadvantages of heavy mass, toxicity, and poor wearability. Cement and alloy also are used to shield the X-ray, whereas application is limited by its heavy mass. In recent years, the wearable polymer based radiation protection was developed but has the defect which is low interfacial compatibility, resulting in poor shielding properties of the material. The K or L absorption edge of an element plays a major role in the attenuation of X-ray photon energy, and has a significant attenuation effect on X-ray photons with similar energy. As an alternative, it has been reported that the K absorption edge of rare earth (RE) elements is located in the range of 40-80 keV, which corresponds to the energy range of X-rays and medical X-ray energy range. Additionally, natural leather (NL) is an abundant natural biomass that is composed of multi-layered collagen fibers and contains amino (-NH2), carboxyl (-COOH), and hydroxyl (-OH) groups. We believe that RE nanoparticles can be uniformly immobilized and stabilized by NL. In this study, we developed a novel strategy to prepare X-ray radiation protective materials by combining RE nanoparticles with NL. NL-based protective materials have the advantages of being lightweight and wearable while providing excellent protection. NL-based RE oxide nanoparticle composites (RE-NL) were successfully prepared by a "retanning" method and verified by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive spectrometer (EDS) and transmission electron microscopy (TEM). X-ray protection tests showed that La-NL had the best shielding performance compared to the other tested RE oxide-loaded NLs owing to the small difference between the K-edge energy of La and the incident energy. Moreover, La7.80-NL (La2O3 content of 7.80 mmol·cm-3, 0.7 mm) showed better protection performance than a Pb plate with a high-Z elemental content (54.7 mmol·cm-3, 0.25 mm) at 40-80 keV, confirming that the uniform distribution of RE oxides in NL provides enhanced X-ray shielding performance. The RE-NL also displayed a much better tensile strength, tear strength, and softness compared with polymer-based RE oxide composites. Meanwhile, it has the foldability and character of tailor. Therefore, the reported NL-based RE protective materials show promising potential for various scenarios requiring radiation protection.

Key words: Nature leather, Rare earth nanoparticle, X-ray, Wearable protective material, Attenuation efficiency

MSC2000: 

  • O644