Hierarchical hybrid conductive powders derived from Ag-deposited Janus particle/MWCNT nanocomposites for enhanced microwave absorption

IF 4.2 2区工程技术 Q2 ENGINEERING, CHEMICAL

Advanced Powder Technology Pub Date : 2025-04-03 DOI:10.1016/j.apt.2025.104861

Hengqian Jin, Shufei Wei, Yunpeng Jiang, Huarong Nie, Xinping Zhang, Aihua He

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引用次数: 0

Abstract

In this study, snowman-like Janus particles (PDVB/PS@SiO₂) were proposed as carriers of Ag nanoparticles (Ag@J) to construct a hierarchical hybrid conductive powders by further admixing with MWCNTs for the development of high-performance microwave-absorbing materials. The Ag@J/MWCNT composite powders have several advantages in microwave absorption, such as the polarization of SiO₂ hemispheres, multiple reflections and scattering of electromagnetic waves in the hollow cavity of PDVB/PS hemispheres, improved conductivity and dielectric loss originating from the dense deposition of Ag nanoparticles and incorporation of MWCNTs. Furthermore, the composite powders allow the interfacial polarization and favorable impedance matching. Notably, the asymmetric hemispheres of the Ag@J particles result in close packing, further reducing the transmission of electromagnetic waves. The Ag@J particles demonstrated a minimum reflection loss (RL_min), indicating their potential application in microwave absorption. When further integrated with MWCNTs, the Ag@J/MWCNT composite powders, containing 36.4 wt% of Ag@J, exhibited strong absorption (−27 dB), wide absorption bandwidth (16.5 − 18 GHz), and a low thickness (5.5 mm). The Janus particles reported in this study show high potential applications in microwave-absorbing powder materials.

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由镀银Janus颗粒/MWCNT纳米复合材料制备的增强微波吸收的分层杂化导电粉末

本研究提出雪人状Janus粒子（PDVB/PS@SiO2）作为银纳米粒子（Ag@J）的载体，进一步与MWCNTs混合，构建层次化杂化导电粉末，开发高性能吸波材料。Ag@J/MWCNT复合粉末在微波吸收方面具有许多优点，如SiO2半球的极化、电磁波在PDVB/PS半球中空腔中的多次反射和散射、银纳米粒子的致密沉积和MWCNTs的掺入提高了其导电性和介电损耗。此外，复合粉末允许界面极化和良好的阻抗匹配。值得注意的是，Ag@J粒子的不对称半球导致紧密堆积，进一步减少了电磁波的传输。Ag@J粒子具有最小的反射损失（RLmin），表明其在微波吸收方面具有潜在的应用前景。当与MWCNT进一步集成时，含有36.4% Ag@J的Ag@J/MWCNT复合粉末具有强吸收（- 27 dB）、宽吸收带宽（16.5 - 18 GHz）和低厚度（5.5 mm）的特点。本研究报道的Janus粒子在吸波粉末材料中具有很高的应用潜力。

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来源期刊

Advanced Powder Technology 工程技术-工程：化工

CiteScore

9.50

自引率

7.70%

发文量

424

审稿时长

55 days

期刊介绍： The aim of Advanced Powder Technology is to meet the demand for an international journal that integrates all aspects of science and technology research on powder and particulate materials. The journal fulfills this purpose by publishing original research papers, rapid communications, reviews, and translated articles by prominent researchers worldwide. The editorial work of Advanced Powder Technology, which was founded as the International Journal of the Society of Powder Technology, Japan, is now shared by distinguished board members, who operate in a unique framework designed to respond to the increasing global demand for articles on not only powder and particles, but also on various materials produced from them. Advanced Powder Technology covers various areas, but a discussion of powder and particles is required in articles. Topics include: Production of powder and particulate materials in gases and liquids(nanoparticles, fine ceramics, pharmaceuticals, novel functional materials, etc.); Aerosol and colloidal processing; Powder and particle characterization; Dynamics and phenomena; Calculation and simulation (CFD, DEM, Monte Carlo method, population balance, etc.); Measurement and control of powder processes; Particle modification; Comminution; Powder handling and operations (storage, transport, granulation, separation, fluidization, etc.)