Heterogeneous Waterborne Polyurethane Composite with Alternating Electromagnetic Layers for Absorption-Dominated Electromagnetic Interference Shielding

Feng, Yujia; Li, Mengyao; Yang, Siqi; Wang, Jian

doi:10.1021/acs.langmuir.3c01133

Cited by 7 publications

(3 citation statements)

References 59 publications

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“…The S -parameter was used to calculate the T , A , and R of CPA aerogels Figure c illustrated that the R -value in CPA aerogels change with an increase in AgNWs content.…”

Section: Results and Disscussionmentioning

confidence: 99%

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Ultralight Flexible Collagen Fiber Based Aerogels Derived from Leather Solid Waste for High Electromagnetic Interference Shielding

Lyu,

Guo,

Gao

et al. 2024

Langmuir

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Designing and developing high-performance shielding materials against electromagnetic interference is of utmost importance due to the rapid advancement of wireless telecommunication technologies. Such materials hold both fundamental and technological significance. A threestage process is presented for creating ultralight, flexible aerogels from biomass to shield against electromagnetic interference. Collagen fibers sourced from leather solid waste are used for: (i) freeze-drying preparation of collagen fibers/poly(vinyl alcohol) (PVA) aerogels, (ii) adsorption of silver nanowires (AgNWs) onto collagen fiber/PVA aerogels, and (iii) Hydrophobic modification of collagen fiber/PVA/AgNWs aerogels with 1H, 1H, 2H, 2H-perfluorodecyltriethoxysilane (POTS). Scanning electron microscopy studies reveal that an interweaving of AgNWs and collagen fiber/PVA porous network has formed a conductive network, exhibiting an electrical conductivity of 10 3 S•m −1 . The electromagnetic interference shielding effectiveness reached more than 62 dB, while the density was merely 5.8 mg/cm 3 . The collagen fiber/PVA/AgNWs/POTS aerogel displayed an even better electromagnetic shielding efficiency of 73 dB and water contact angle of 147°. The study results emphasize the distinctive capacity of leather solid waste to generate cost-effective, ecofriendly, and highly efficient electromagnetic interference shielding materials.

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“…The S -parameter was used to calculate the T , A , and R of CPA aerogels Figure c illustrated that the R -value in CPA aerogels change with an increase in AgNWs content.…”

Section: Results and Disscussionmentioning

confidence: 99%

“…The S-parameter was used to calculate the T, A, and R of CPA aerogels. 38 Figure 4c illustrated that the R-value in CPA aerogels change with an increase in AgNWs content. This could be attributed to an exacerbation of the impedance mismatch caused by the increase in the electrical conductivity.…”

Section: T H Imentioning

confidence: 93%

Ultralight Flexible Collagen Fiber Based Aerogels Derived from Leather Solid Waste for High Electromagnetic Interference Shielding

Lyu,

Guo,

Gao

et al. 2024

Langmuir

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“…Hence, electromagnetic shielding materials have been developed to equip us against the burgeoning hazard. − The microwave-shielding characteristics of the bioinspired/PS composites are depicted in Figure . The total shielding efficiency (SE T ) is calculated by the sum of the absorption (SE A ) and reflection (SE R ) shielding efficiencies. − The shielding materials operating based on the absorption have been the hotspot, obtained by the tuned impedance matching. This phenomenon diminishes the pollution, emerging from the reflected waves from the absorber thresholds. , The plasma-engineered biowastes illustrate the moderate shielding features boosting the general applications of PS-based products.…”

Section: Resultsmentioning

confidence: 99%

Plasma Engineering toward Improving the Microwave-Absorbing/Shielding Feature of a Biomass-Derived Material

Selseleh-Zakerin,

Mirkhan,

Shafiee

et al. 2024

Langmuir

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During the past decade, ever-increasing electromagnetic pollution has excited a global concern. A sustainable resource, facile experimental scenario, fascinating reflection loss (RL), and broad efficient bandwidth are the substantial factors that intrigue researchers. This research led to the achievement of a brilliant microwave-absorbing material by treating pampas as biomass. The carbon-based microfibers attained by biowaste were treated by plasma under diverse environments to amplify their microwave-absorbing features. Moreover, a pyrolysis scenario was performed to compare the results. The reductive processes were performed by H 2 plasma and carbonization. However, the CO 2 plasma was performed to regulate the heteroatoms and defects. Interestingly, polystyrene (PS) was applied as a microwaveabsorbing matrix. The aromatic rings existing in the absorbing medium establish electrostatic interactions, elevating interfacial polarization, and physical characteristics of PS augment the practical applications of the final product. The manipulated biomasses were characterized by Raman, X-ray diffraction, energy-dispersive spectroscopy, field emission scanning electron microscopy, and diffuse reflection spectroscopy analyses. Eventually, the microwave-absorbing features were estimated by a vector network analyzer. The plasma-treated pampas under H 2 /Ar blended with PS gained a maximum RL of −90.65 dB at 8.79 GHz and an efficient bandwidth (RL ≤ −10 dB) of 4.24 GHz with a thickness of 3.20 mm; meanwhile, plasma treatment under CO 2 led to a maximum RL of 97.99 dB at 14.92 GHz and an efficient bandwidth of 7.74 GHz with a 2.05 mm thickness. Particularly, the biomass plasmolyzed under Ar covered the entire X and K u bands with a thickness of 2.10 mm. Notably, total shielding efficiencies of the treated bioinspired materials were up to ≈99%, desirable for practical applications.

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Adjustable Humidity Response: Ultrahigh Green EMI Shielding Gel with Double‐Side Constant Temperature Capability

Ma,

He,

Liu

et al. 2024

Adv Funct Materials

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With the increasingly serious secondary pollution of electromagnetic waves (EMWs), efficient green shielding materials have become an urgent need. MXene is widely used in electromagnetic interference (EMI) shielding due to its large surface area and high conductivity. Here, this work constructs MXene islands with better shielding performance through viscosity control and continuous mechanical stirring. Benefiting from the MXene islands, Janus‐structural gel with humidity response is successfully prepared, showing controllable ultrahigh green shielding property (up to 100.5 dB, thickness of 2 mm). Interestingly, this gel can spontaneously adjust its water content according to the humidity, resulting in a reversible transformation in three states to meet the needs of different environments. By Janus‐structural design and reasonable material combination, this gel demonstrates excellent electrothermal (rise to 111.6 °C, 5 s, 2 V)/thermal insulation (thermal conductivity is low to 0.029 W m−1 K−1) properties to meet the needs of shielding in underwater/fire operations.

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Heterogeneous Waterborne Polyurethane Composite with Alternating Electromagnetic Layers for Absorption-Dominated Electromagnetic Interference Shielding

Cited by 7 publications

References 59 publications

Ultralight Flexible Collagen Fiber Based Aerogels Derived from Leather Solid Waste for High Electromagnetic Interference Shielding

Ultralight Flexible Collagen Fiber Based Aerogels Derived from Leather Solid Waste for High Electromagnetic Interference Shielding

Plasma Engineering toward Improving the Microwave-Absorbing/Shielding Feature of a Biomass-Derived Material

Adjustable Humidity Response: Ultrahigh Green EMI Shielding Gel with Double‐Side Constant Temperature Capability

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