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Molecules
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Nanoporous Materials in Electromagnetic Protection/Smart Applications
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Nanoporous Materials in Electromagnetic Protection/Smart Applications

A special issue of Molecules (ISSN 1420-3049). This special issue belongs to the section "Applied Chemistry".

Deadline for manuscript submissions: closed (31 March 2024) | Viewed by 4497

Special Issue Editors

Prof. Dr. Yuxin Zhang

E-Mail Website
Guest Editor
College of Material Science and Engineering, Chongqing University, Chongqing 400044, China
Interests: environmental protection; sustainability; renewable energy source; sewage treatment; anti-corrosion technology
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Yi Hou

E-Mail Website
Guest Editor
College of Materials Science and Engineering, Nanjing Tech University, Nanjing 211816, China
Interests: microwave adsorption; electromagnetic functional material; functional ceramics; SiC nanowires
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Given the considerable expansion of the application of wireless communications, radar systems and high-frequency circuit devices in the gigahertz (GHz) range, the problem of electromagnetic (EM) interference and EM compatibility is becoming increasingly serious. Overexposure to microwave energy not only interferes with radio communications and sensitive electronic devices but also endangers the health of humans. In view of this, eliminating unwanted EM energies and providing a safe electromagnetic environment is a challenging task. The advent of nanotechnology has given immense scope and opportunities for the fabrication of desired nanomaterials with large surface-to-volume ratios (excellent EM characteristics) and unique functionalities to attenuate EM waves. The nanomaterials play major roles in microwave absorption (and EM shielding), and typical nano-absorbent materials mainly include nano-ferromagnetic metal and alloys, nanoceramics, nano-oxide, nanocarbon materials and nanoporous materials. Despite the excellent progress in all types of nano-absorbent porous materials for EM pollution protection, significant challenges still remain to be addressed. Nano-absorbent materials have played and will undoubtedly continue to play critical roles in the future developments of EM pollution protection technologies.

The aim of this Special Issue is to collect state-of-the-art works on nanoporous materials, particularly on the application of nanostructured materials and nanoscale materials for a wide range of EM protection applications or other smart applications.

Prof. Dr. Yuxin Zhang
Prof. Dr. Yi Hou
Guest Editors

Manuscript Submission Information

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Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Molecules is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2700 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • nano-porous absorbent
  • nano-porous catalysts
  • ferromagnetic metal-based electromagnetic protection materials
  • MOFs-based electromagnetic protection materials
  • diatomite-based porous ceramics electromagnetic protection materials
  • graphene-based electromagnetic protection materials
  • carbon nanotube-based electromagnetic protection materials
  • 1D nano-electromagnetic protection materials
  • 2D nano-electromagnetic protection materials
  • 3D nano-electromagnetic protection materials
  • nanostructured electromagnetic protection materials
  • nanoscale electromagnetic protection materials
  • nanocomposite electromagnetic protection materials
  • nanomaterial-based applications for electromagnetic protection
  • porous nano-environmental governance materials
  • porous nanomaterial-based applications for microwave absorption
  • porous nanomaterial-based applications for electromagnetic shielding
  • nanomaterial-based applications for electromagnetic metamaterials
  • sustainable nanotechnology

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Published Papers (2 papers)

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Research

15 pages, 9993 KiB  
Article
Fabrication and Investigation of the Microwave Absorption of Nonwovens Modified by Carbon Nanotubes and Graphene Flakes
by Wenyan Gu, Jiang Shi, Jiaqiao Zhang, Qi Jia, Chengwei Liu, Haiyan Ge, Qilong Sun and Licheng Zhu
Molecules 2023, 28(17), 6419; https://doi.org/10.3390/molecules28176419 - 3 Sep 2023
Cited by 3 | Viewed by 1687
Abstract
This study aims to investigate the influences of carbon nanotubes (CNTs) and graphene flakes (GFs) on the microwave absorption performance of nonwovens. Nonwovens were modified with CNTs and GFs through an impregnation method, creating a series of absorption samples with different carbon nanomaterial [...] Read more.
This study aims to investigate the influences of carbon nanotubes (CNTs) and graphene flakes (GFs) on the microwave absorption performance of nonwovens. Nonwovens were modified with CNTs and GFs through an impregnation method, creating a series of absorption samples with different carbon nanomaterial contents. Then the absorption performance of the samples was tested on both sides in the X-band (8.2~12.4 GHz) and the Ku-band (12~18 GHz) using the arch method. The experimental results showed that the absorption performance of GF-impregnated nonwovens was superior to that of CNT-impregnated nonwovens, and the overall absorption performance in the Ku-band was better than in the X-band. At a CNT content of 5 wt.%, the reflection loss of the impregnated nonwovens on the backside reached a minimum of −14.06 dB and remained below −10 dB in the 17.42~17.88 GHz frequency range. The sample fabricated with 4 wt.% GFs in the impregnation solution exhibited the best absorption performance, with minimum reflection losses of −15.33 dB and −33.18 GHz in the X-band and Ku-band, respectively. When the GFs were at 3 wt.%, the absorption bandwidth below −10 dB reached 4.16 GHz. In contrast to CNT-impregnated nonwovens, the frontside of GF-impregnated nonwovens demonstrated better absorption performance in the Ku-band. The results of this work provide experimental data support for the fabrication and application of microwave absorption materials. Full article
(This article belongs to the Special Issue Nanoporous Materials in Electromagnetic Protection/Smart Applications)
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16 pages, 7836 KiB  
Article
High-Entropy Spinel Ferrites with Broadband Wave Absorption Synthesized by Simple Solid-Phase Reaction
by Xiu Chang, Zhiwei Duan, Dashuang Wang, Shushen Wang, Zhuang Lin, Ben Ma and Kaiming Wu
Molecules 2023, 28(8), 3468; https://doi.org/10.3390/molecules28083468 - 14 Apr 2023
Cited by 11 | Viewed by 2105
Abstract
In this work, high-entropy (HE) spinel ferrites of (FeCoNiCrM)xOy (M = Zn, Cu, and Mn) (named as HEO-Zn, HEO-Cu, and HEO-Mn, respectively) were synthesized by a simple solid-phase reaction. The as-prepared ferrite powders possess a uniform distribution of chemical components [...] Read more.
In this work, high-entropy (HE) spinel ferrites of (FeCoNiCrM)xOy (M = Zn, Cu, and Mn) (named as HEO-Zn, HEO-Cu, and HEO-Mn, respectively) were synthesized by a simple solid-phase reaction. The as-prepared ferrite powders possess a uniform distribution of chemical components and homogeneous three-dimensional (3D) porous structures, which have a pore size ranging from tens to hundreds of nanometers. All three HE spinel ferrites exhibited ultrahigh structural thermostability at high temperatures even up to 800 °C. What is more, these spinel ferrites showed considerable minimum reflection loss (RLmin) and significantly enhanced effective absorption bandwidth (EAB). The RLmin and EAB values of HEO-Zn and HEO-Mn are about −27.8 dB at 15.7 GHz, 6.8 GHz, and −25.5 dB at 12.9 GHz, 6.9 GHz, with the matched thickness of 8.6 and 9.8 mm, respectively. Especially, the RLmin of HEO-Cu is −27.3 dB at 13.3 GHz with a matched thickness of 9.1 mm, and the EAB reaches about 7.5 GHz (10.5–18.0 GHz), which covers almost the whole X-band range. The superior absorbing properties are mainly attributed to the dielectric energy loss involving interface polarization and dipolar polarization, the magnetic energy loss referring to eddy current and natural resonance loss, and the specific functions of 3D porous structure, indicating a potential application prospect of the HE spinel ferrites as EM absorbing materials. Full article
(This article belongs to the Special Issue Nanoporous Materials in Electromagnetic Protection/Smart Applications)
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