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231226s2022 xx |||||o 00| ||eng c |
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|a 10.1002/adma.202205376
|2 doi
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|a eng
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| 100 |
1 |
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|a Zhao, Zehao
|e verfasserin
|4 aut
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| 245 |
1 |
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|a Hydro/Organo/Ionogels
|b "Controllable" Electromagnetic Wave Absorbers
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|c 2022
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|a Text
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|a ƒaComputermedien
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|a ƒa Online-Ressource
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|a Date Revised 26.10.2022
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|a published: Print-Electronic
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|a Citation Status PubMed-not-MEDLINE
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|a © 2022 Wiley-VCH GmbH.
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|a Demand for electromagnetic wave (EMW) absorbers continues to increase with technological advances in wearable electronics and military applications. In this study, a new strategy to overcome the drawbacks of current absorbers by employing the co-contribution of functional polymer frameworks and liquids with strong EMW absorption properties is proposed. Strongly polar water, dimethyl sulfoxide/water mixtures, and highly conductive 1-ethyl-3-methylimidazolium ethyl sulfate ([EMI][ES]) are immobilized in dielectrically inert polymer networks to form different classes of gels (hydrogels, organogels, and ionogels). These gels demonstrate a high correlation between their dielectric properties and polarity/ionic conductivity/non-covalent interaction of immobilized liquids. Thus, the EMW absorption performances of the gels can be precisely tuned over a wide range due to the diversity and stability of the liquids. The prepared hydrogels show good shielding performance (shielding efficiency > 20 dB) due to the high dielectric constants, while organogels with moderate attenuation ability and impedance matching achieve full-wave absorption in X-band (8.2-12.4 GHz) at 2.5 ± 0.5 mm. The ionogels also offer a wide effective absorption bandwidth (10.79-16.38 GHz at 2.2 mm) via prominent ionic conduction loss. In short, this work provides a conceptually novel platform to develop high-efficient, customizable, and low-cost functional absorbers
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|a Journal Article
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|a hydrogels
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|a ionic conduction loss
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|a ionogels
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|a organogels
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|a polarization loss
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1 |
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|a Zhang, Limin
|e verfasserin
|4 aut
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| 700 |
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|a Wu, Hongjing
|e verfasserin
|4 aut
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| 773 |
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|i Enthalten in
|t Advanced materials (Deerfield Beach, Fla.)
|d 1998
|g 34(2022), 43 vom: 08. Okt., Seite e2205376
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|x 1521-4095
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|g volume:34
|g year:2022
|g number:43
|g day:08
|g month:10
|g pages:e2205376
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|u http://dx.doi.org/10.1002/adma.202205376
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