Lignin‐Derived Lightweight Carbon Aerogels for Tunable Epsilon‐Negative Response

Advanced Science, Journal Year: 2024, Volume and Issue: 11(26)

Published: May 7, 2024

Abstract Electromagnetic (EM) metamaterials have garnered considerable attention due to their capacity achieve negative parameters, significantly influencing the integration of natural materials with artificially structural media. The emergence carbon aerogels (CAs) offers an opportunity create lightweight EM metamaterials, notable for promising shielding or absorption effects. This paper introduces efficient, low‐cost method fabricating CAs without requiring stringent drying conditions. By finely tuning ZnCl 2 /lignin ratio, porosity is controlled in CAs. control leads epsilon‐negative response radio‐frequency region, driven by intrinsic plasmonic state 3D network, as opposed traditional periodic building blocks. approach yields a tunable and weakly response, reaching order magnitude −10 3 under MHz frequencies. Equivalent circuit analysis highlights inductive characteristics CAs, correlating significant dielectric loss at low Additionally, simulations are performed evaluate distribution electric field vector showcasing potential effective shielding. lignin‐derived, hold promise pioneering new directions broadening application diverse extreme

Language: Английский

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Effects of process conditions and nano-fillers on the cell structure and mechanical properties of co-injection molded polypropylene-polyethylene composites

Polymer, Journal Year: 2024, Volume and Issue: 299, P. 126935 - 126935

Published: March 18, 2024

Compared with traditional injection foaming, co-injection foaming serves as a method to prepare products high-quality surfaces and enhanced mechanical properties, demonstrating excellent technical advantages economic benefits. The effects of high-density polyethylene (HDPE) content, agent melting temperature core material, nano-organic montmorillonite (OMMT) content on the cell structure, crystallization behavior isotactic polypropylene (iPP)/HDPE composite foam prepared by were systematically studied. At 2 wt.%, HDPE 30 OMMT 3 material 190 °C, exhibited size measuring 85 μm, density 2.5 × 105 cells/cm3, tensile strength 25.8 MPa, an impact 12.5 kJ/m2. addition reduced crystallinity iPP matrix, while enhancing solubility carbon dioxide within matrix. non-miscible interface between helped reduce energy barrier for nucleation. Furthermore, introduction nucleating in iPP/HDPE dramatically decreased These synergistic result smaller higher density, exhibiting comprehensive properties. This work provides feasible preparing performance.

Language: Английский

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Flexible and biocompatible polyurethane/Co@C composite films with weakly negative permittivity

Advanced Composites and Hybrid Materials, Journal Year: 2024, Volume and Issue: 7(1)

Published: Jan. 28, 2024

Language: Английский

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Electrospun PVDF-MoSe2 nanofibers based hybrid triboelectric nanogenerator for self-powered water splitting system

Journal of Alloys and Compounds, Journal Year: 2024, Volume and Issue: 978, P. 173416 - 173416

Published: Jan. 4, 2024

Language: Английский

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Regulation mechanism of epsilon-negative monolayer graphene/CaCu3Ti4O12 metacomposites for boosting electromagnetic shielding

Advanced Composites and Hybrid Materials, Journal Year: 2024, Volume and Issue: 7(2)

Published: Feb. 20, 2024

Language: Английский

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