High-entropy oxide reinforced HDPE polymer composite: A novel approach to gamma-ray shielding

IF 3.9 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Science and Engineering: B Pub Date : 2025-03-31 DOI:10.1016/j.mseb.2025.118262

Sidharth S Menon , S. Arshia , Amarnath Pasupathi , Arun Prasath Ramaswamy , Karunakara Naregundi , Yashodhara Indaje , Arvind Kumar Yogi , Yugeswaran Subramaniam

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Abstract

This study aims to synthesize high entropy oxide (HEO) nanoparticles reinforced high density polyethylene (HDPE) composites for effective gamma-ray shielding application. For this purpose, a phase-pure (La₀.₅Gd_0.5Ce₀.₅Y₀.₅)₂Zr₂O₇ HEO nanoparticles were produced through thermal plasma technique. As-synthesized HEO nanoparticles in pyrochlore structure, exhibit excellent thermal stability and structural integrity when annealed at 800 °C. The composites were prepared by adding different weight percentages (5, 10, 15, and 20 wt%) of as-synthesized HEO nanoparticles with HDPE matrix and studied their phase, microstructure, and mechanical properties. Backscattering and transmission experiments were conducted using various gamma radiation sources ⁵⁴Mn (835 keV), ⁶⁰Co (1170 keV), and ⁶⁰Co (1330 keV) to evaluate the radiation shielding parameters. The results indicate that increasing the weight percentage of HEO in the HDPE composite matrix leads to enhances the linear attenuation coefficient (LAC) irrespective of incident gamma radiation energy. In contrast, the half-value layer (HVL) and tenth-value layer (TVL) values of the composites decrease as the weight percentage of HEO increases in the HDPE matrix. The HDPE composite reinforced with 20 wt% HEO demonstrated superior radiation attenuation and enhanced mechanical stability compared to composites with lower HEO concentrations. It exhibited significantly improved gamma-ray shielding over pristine HDPE, reducing TVL from 37.13 cm to 16.68 cm and HVL from 11.32 cm to 5.02 cm at 835 keV photon energy. At 1330 keV, the composite achieved a 45 % reduction in HVL, a 44 % reduction in TVL, and a threefold increase in LAC.

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本研究旨在合成高熵氧化物（HEO）纳米粒子增强高密度聚乙烯（HDPE）复合材料，以有效屏蔽伽马射线。为此，研究人员采用热等离子体技术制备了相纯的（La0.5Gd0.5Ce0.5Y0.5）2Zr2O7 HEO 纳米粒子。合成的 HEO 纳米粒子具有热绿结构，在 800 ℃ 退火时表现出优异的热稳定性和结构完整性。在高密度聚乙烯基体中加入不同重量百分比（5、10、15 和 20 wt%）的合成 HEO 纳米粒子制备了复合材料，并对其相位、微观结构和机械性能进行了研究。使用各种伽马辐射源 54Mn（835 keV）、60Co（1170 keV）和 60Co（1330 keV）进行了背散射和透射实验，以评估辐射屏蔽参数。结果表明，增加高密度聚乙烯复合材料基体中 HEO 的重量百分比可提高线性衰减系数（LAC），而与入射伽马辐射能量无关。相反，复合材料的半值层（HVL）和十值层（TVL）值随着高密度聚乙烯基体中 HEO 重量百分比的增加而降低。与使用较低浓度 HEO 的复合材料相比，使用 20 wt% HEO 增强的高密度聚乙烯复合材料具有更好的辐射衰减性和更高的机械稳定性。与原始高密度聚乙烯相比，该复合材料的伽马射线屏蔽能力明显提高，在 835 keV 光子能量下，TVL 从 37.13 cm 降低到 16.68 cm，HVL 从 11.32 cm 降低到 5.02 cm。在 1330 千伏时，复合材料的 HVL 降低了 45%，TVL 降低了 44%，LAC 增加了三倍。

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来源期刊

Materials Science and Engineering: B 工程技术-材料科学：综合

CiteScore

5.60

自引率

2.80%

发文量

481

审稿时长

3.5 months

期刊介绍： The journal provides an international medium for the publication of theoretical and experimental studies and reviews related to the electronic, electrochemical, ionic, magnetic, optical, and biosensing properties of solid state materials in bulk, thin film and particulate forms. Papers dealing with synthesis, processing, characterization, structure, physical properties and computational aspects of nano-crystalline, crystalline, amorphous and glassy forms of ceramics, semiconductors, layered insertion compounds, low-dimensional compounds and systems, fast-ion conductors, polymers and dielectrics are viewed as suitable for publication. Articles focused on nano-structured aspects of these advanced solid-state materials will also be considered suitable.