Enhanced microwave absorption in organogels: The synergy of polar molecules and magnetic particles

IF 4.9 2区化学 Q2 CHEMISTRY, PHYSICAL

Colloids and Surfaces A: Physicochemical and Engineering Aspects Pub Date : 2024-11-07 DOI:10.1016/j.colsurfa.2024.135712

Wanting Xu , Jie Li , You Wu , Zhongchen Lu , Tao Wang , Wenbo Ju , Bin Yuan

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引用次数: 0

Abstract

Herein, wideband microwave absorbing materials with high flexibility are developed by creating a novel layered organogel composite consisting of carbonyl iron particles (CIP) and polyacrylamide (PAM), employing ethylene glycol (EG) as the solvent. The microwave absorbing properties of layered absorbers with different CIP contents are investigated over the 1–18 GHz range. An integrated stratified architecture was obtained using polar EG molecules and magnetic CIP particles, which were the main contributors to magnetic and dielectric losses in the PAM matrix. The results indicated that the minimum reflection loss reaches a value of −48.0 dB at a thickness of 2 mm and a frequency of 15.5 GHz; meanwhile, an effective absorption bandwidth of 3.2 GHz in the C-band can also be obtained. An analysis of the absorption mechanism shows that the combination of an impedance-matching layer composed of CIP magnetic particles and an absorption layer composed of EG polar molecules in the PAM matrix provides strong broadband absorption in the C-band. Overall, the CIP/EG@PAM organogel composites have simple preparation, high flexibility, and it has adhesion. This study provides a new strategy for designing wideband microwave absorbing materials.

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增强有机凝胶的微波吸收：极性分子和磁性颗粒的协同作用

本文以乙二醇（EG）为溶剂，通过制造由羰基铁颗粒（CIP）和聚丙烯酰胺（PAM）组成的新型层状有机凝胶复合材料，开发出了具有高柔性的宽带微波吸收材料。研究了不同 CIP 含量的分层吸收体在 1-18 GHz 范围内的微波吸收特性。利用极性 EG 分子和磁性 CIP 颗粒获得了一种集成分层结构，它们是 PAM 矩阵中磁损和介损的主要贡献者。结果表明，在厚度为 2 mm、频率为 15.5 GHz 时，最小反射损耗值达到 -48.0 dB；同时，在 C 波段还能获得 3.2 GHz 的有效吸收带宽。对吸收机制的分析表明，由 CIP 磁性颗粒组成的阻抗匹配层和 PAM 矩阵中由 EG 极性分子组成的吸收层相结合，可在 C 波段提供强大的宽带吸收。总之，CIP/EG@PAM 有机凝胶复合材料具有制备简单、柔韧性高、附着力强等特点。这项研究为设计宽带微波吸收材料提供了一种新策略。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Colloids and Surfaces A: Physicochemical and Engineering Aspects 化学-物理化学

CiteScore

8.70

自引率

9.60%

发文量

2421

审稿时长

56 days

期刊介绍： Colloids and Surfaces A: Physicochemical and Engineering Aspects is an international journal devoted to the science underlying applications of colloids and interfacial phenomena. The journal aims at publishing high quality research papers featuring new materials or new insights into the role of colloid and interface science in (for example) food, energy, minerals processing, pharmaceuticals or the environment.