A microstructure-driven magnetic composite for excellent microwave absorption in extended Ku-band

Khatua, Bhanu Bhusan; De, Amitabha

doi:10.1039/d1tc06038d

Cited by 9 publications

(5 citation statements)

References 52 publications

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“…This is due to formation of a network of microcapacitors through a homogeneous dispersion. According to the Maxwell–Wagner–Sillars polarization principle, the different conductivities between conductive charges and polymer in the hydrogel lead to polarization and charge accumulation at the interfaces, which helps to increase the real part of the permittivity. , Also, a high conductive AgNRs content in the PAM-Alg-Ag hydrogel improved the imaginary part of the permittivity, which contributes to the high electrical loss due to the presence of free electrons in AgNRs . After PDMS encapsulation, the encapsulated hydrogel showed lower values because of the insulating nature of PDMS.…”

Section: Resultsmentioning

confidence: 99%

Elastomer Encapsulated Silver Nanorod Dispersed Polyacrylamide-Alginate Hydrogel for Water-Pressure-Dependent EMI Shielding Application

Paria

Bera

et al. 2022

ACS Appl. Eng. Mater.

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Smart electromagnetic interference (EMI) shielding materials with tunable EMI shielding effectiveness (SE) have garnered huge attention in the fabrication of next generation EM devices as well as innovative wearable electronics. Here, we report a polydimethylsiloxane (PDMS) encapsulated soft, flexible, and stretchable polyacrylamide (PAM)-alginate (Alg)-hydrogel/silver nanorod (AgNR) composite system for EMI SE application. The PDMS encapsulation not only enhances the tensile strength of the system from ∼0.057 MPa to ∼0.724 MPa but also restricts the evaporation of water from the hydrogel matrix. Consequently, at 14.5 GHz frequency, the EMI SE (∼48.72 dB) of the hydrogel was reduced to ∼10.52 dB (72 h at 30 °C) and ∼6.44 dB (72 h at 40 °C) and ∼8.03 dB after 1 week of settlement at ambient conditions. However, for the encapsulated hydrogel, the EMI SE (∼40.65 dB) value was marginally reduced to ∼33.86 dB, ∼31.45 dB, and ∼32.42 dB, respectively, under the same conditions. Moreover, by changing the sample thickness (increasing holding pressure in a VNA sample holder), the shielding performance can be altered from ∼48.72 to ∼53.63 dB for the hydrogel and from ∼40.65 to ∼44.03 dB for the encapsulated hydrogel. Thus, these findings provide an innovative strategy to fabricate a flexible and stretchable EMI shielding material with adjustable SE by varying the content of water and applying pressure for futuristic development in smart electronics.

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Section: Resultsmentioning

confidence: 99%

Elastomer Encapsulated Silver Nanorod Dispersed Polyacrylamide-Alginate Hydrogel for Water-Pressure-Dependent EMI Shielding Application

Paria

Bera

et al. 2022

ACS Appl. Eng. Mater.

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“…The superior magnetic properties of hybrid liquid metal fillers would contribute to the magnetic dipoles to attenuate electromagnetic waves and enhance the EMI shielding efficiency of LGN‐LCE. [ 33 ] The mechanistic insight of EMI shielding effect can be illustrated in Figure 3b. Electromagnetic radiation can be divided into three parts: absorption (A), reflection (R), and transmission (T).…”

Section: Resultsmentioning

confidence: 99%

Cuttlefish‐Inspired Self‐Adaptive Liquid Metal Network Enabling Electromagnetic Interference Shielding and Thermal Management

Xing

Chen

et al. 2023

Adv Materials Technologies

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With the refinement and miniaturization of integrated electronic devices, the requirements for stable operating temperature and antielectromagnetic interference are increasingly high. However, most of the current materials necessitate to develop the intelligent self‐adaptive regulation in response to external field stimuli to gratify the stipulations of different operating environments. Herein, cuttlefish‐inspired smart liquid metal based‐liquid crystal elastomer (LGN‐LCE) dual‐functional material enabling self‐adaptive electromagnetic wave interference shielding and thermal management is presented. Liquid crystal elastomer matrix endows the LGN‐LCE dynamic self‐morphing properties under thermal activation, which leads to the liquid metal network with tunable thermal/electrical conduction. The thermal conductivity of LGN‐LCE can be increased to 10.3 W m−1 K−1 with the rise of surrounding temperature, while the electrical conductivity of LGN‐LCE can be enhanced to 4.3 × 105 S m−1. Such promoted electrical conductivity helps strengthen electromagnetic interference (EMI) shielding performance of LGN‐LCE, and the minimum EMI shielding effectiveness of LGN‐LCE can be improved from 48 to 62 dB within the X‐band. This work may not only pave a new way to rationally design a self‐adaptive EMI shielding and thermal management systems, but also show good prospects for practical applications, including thermal management materials, EMI materials, flexible electronic materials, smart materials, artificial intelligence systems, biomedical, and aerospace applications.

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“…With the arrival of fifth-generation (5G) technology, electronic products have been used more widely in national defense, medical, military, and civil fields . At the same time, it also brings serious problems such as electromagnetic interference and radiation pollution. , Specifically, long-term exposure to electromagnetic wave environments can cause people to lose calcium, leading to visual disorders, leukemia, and other diseases . Besides, electromagnetic interference has an adverse effect on the reliability of weapon systems and disrupts the normal operation of digital devices .…”

Section: Introductionmentioning

confidence: 99%

Recent Progress of One-Dimensional Nanomaterials for Microwave Absorption: A Review

Wang

Zhu

Han

et al. 2023

ACS Appl. Nano Mater.

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With the increasing problems of electromagnetic interference and electromagnetic radiation, electromagnetic wave absorption (EMWA) materials have received considerable attention in civil and military fields. Among various EMWA materials, one-dimensional (1D) nanomaterials are recognized as a very promising candidate because of their unique aspect ratio, special shape anisotropy, large specific surface area, and simple manufacturing process. Herein, this paper presents a comprehensive review of recent research progress of 1D nanomaterials for EMWA applications, with a special focus on the advances in general preparation strategies and microscopic structure construction. Furthermore, the current challenge and future prospect of 1D electromagnetic absorbers are proposed, which should provide some guidelines for the design of advanced EMWA materials.

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A microstructure-driven magnetic composite for excellent microwave absorption in extended Ku-band

Abstract: In this work, we present an innovative approach for fabrication of efficient electromagnetic shielding material through tuning the microstructure of the filler in a flexible PDMS polymer matrix. Here, hollow...

Cited by 9 publications

References 52 publications

Elastomer Encapsulated Silver Nanorod Dispersed Polyacrylamide-Alginate Hydrogel for Water-Pressure-Dependent EMI Shielding Application

Elastomer Encapsulated Silver Nanorod Dispersed Polyacrylamide-Alginate Hydrogel for Water-Pressure-Dependent EMI Shielding Application

Cuttlefish‐Inspired Self‐Adaptive Liquid Metal Network Enabling Electromagnetic Interference Shielding and Thermal Management

Recent Progress of One-Dimensional Nanomaterials for Microwave Absorption: A Review

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