Nanomaterials
·
2023
·Vol. 13
·期 18
·2608
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IF 5.3
Xiaoai Ye,Xu Zhang,Xinsheng Zhou,Guigen Wang
Lightweight, flexible, and electrically conductive thin films with high electromagnetic interference (EMI) shielding effectiveness and excellent thermal management capability are ideal for portable and flexible electronic devices. Herein, the asymmetric and multilayered structure Ag-MXene/ANFs composite papers (AMAGM) were fabricated based on Ag-MXene hybrids and aramid nanofibers (ANFs) via a self-reduction and alternating vacuum-assisted filtration process. The resultant AMAGM composite papers exhibit high electrical conductivity of 248,120 S m−1, excellent mechanical properties with tensile strength of 124.21 MPa and fracture strain of 4.98%, superior EMI shielding effectiveness (62 dB), ultra-high EMI SE/t (11,923 dB cm2g−1) and outstanding EMI SE reliability as high as 96.1% even after 5000 cycles of bending deformation benefiting from the unique structure and the 3D network at a thickness of 34 μm. Asymmetric structures play an important role in regulating reflection and absorption of electromagnetic waves. In addition, the multifunctional nanocomposite papers reveal outstanding thermal management performances such as ultrafast thermal response, high heating temperatures at low operation voltage, and high heating stability. The results indicate that the AMAGM composite papers have excellent potential for high-integration electromagnetic shielding, wearable electronics, artificial intelligence, and high-performance heating devices.Keywords:Ag-MXene/ANFs nanocomposite papers;asymmetric structure;EMI shielding;Joule heating performance
研究领域:
材料科学
·
电子工程
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产品关联
DOI
PubMed
高影响因子
Biomedical Materials
·
2022
·Vol. 17
·期 3
·035006
·
IF 4.103
Haibo Wang,Ao Dong,Kun Hu,Weiwei Sun,Jundong Wang,Lu Han,Lixin Mo,Luhai Li,Wei Zhang,Yan Guo,Li Zhu,Fuzhai Cui,Yen Wei
Poly L-lactic acid (PLLA) is a non-toxic, biocompatible degradable polymer material with excellent mechanical properties after moulding. However, it faces challenges in the use of biomedical materials because of its intolerance to bacteria. Here, we use an easy-to-operate method to prepare a composite multilayer membrane: PLLA membrane was used as substrates to assemble positively charged chitosan and negatively charged Ag@MXene on the surface using the layer-by-layer (LBL) method. The assembly process was detected by fluorescein isothiocyanate-labelled chitosan and the thickness of the coating multilayer was also detected as 210.0 ± 12.1 nm for P-M membrane and 460.5 ± 26.5 nm for P-Ag@M membrane. The surface self-assembled multilayers exhibited 91.27% and 96.11% growth inhibition ratio against Escherichia coli and Staphylococcus aureus strains under 808 nm near-infrared laser radiation with a synergistic photothermal antibacterial effect. Furthermore, best biocompatibility of P-M and P-Ag@M membranes compare to PLLA membrane motivated us to further explore its application in biomedical materials.
研究领域:
材料科学
·
生物医学工程
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产品关联
DOI
PubMed
高影响因子
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2024
·
IF 8.1
Shuang Wu,Ting-yu Zhu,Zhu Zeng,De-xiang Sun,Jing-hui Yang,Xiao-dong Qi,Yong Wang
As electronic devices become more integrated into daily life, concerns about electromagnetic radiation pollution become more severe, despite the increased portability they offer. Designing a lightweight and multifunctional material that is environmentally friendly, thermally conductive, and electromagnetically shielded is urgently needed. In this work, novel composites were fabricated by incorporating Ag@MXene hybrid particles into the wood-based aerogel. Compared with the aerogels containing only Ag nanoparticles (AgNPs) or MXene , the Ag@MXene/W aerogel exhibited more homogeneous dispersion of unfolded MXene nanosheets and more AgNPs but higher porosity (97.1 %) and smaller density (0.047 g cm −3 ). Consequently, the Ag@MXene/W aerogel exhibited high compressibility and low energy dissipation, remarkable strain sensitivity, impressive electrical conductivity (33.9 S m −1 ) and specific electromagnetic shielding efficiency (5765.96 dB cm 2 g −1 ), and high thermal conductivity (0.81 W m −1 K −1 ). The excellent comprehensive performances ensure that the aerogel has wide applications in various fields, including electromagnetic pollution protection, strain detecting, and thermal management, etc.
研究领域:
材料科学
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环境科学
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电子工程
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产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Qingying Feng,Yingqing Zhan,Wei Yang,Hongyu Dong,Ao Sun,Lingli Li,Ximin Chen,Yiwen Chen
The membrane fouling from oils, soluble organic matters, and microorganism is inevitable in practical application of oil/water separation, which easily causes the decline in flux and service life of membrane. Therefore, developing the advanced separation membrane with high flux and anti-fouling feature is still a big challenge. Herein, we report a facile strategy to prepare the multifunctional [email protected] /PEN fibrous composite membrane by the self-assembly of [email protected] hybrid on electrospun poly (arylene ether nitrile) (PEN) porous support. In the hierarchical skin layer of fibrous composite membrane, the silver nanoparticles (AgNPs) were anchored onto the MXene surface via the self-reduction of silver nitrate, in which the MXene acted as reductant. Meanwhile, the [email protected] hybrid was stabilized and modified by the bio-inspired dopamine triggered crosslinking with polyethyleneimine. Because of regulated interlayer spacing, super-hydrophilic property, and porous supporting layer, the [email protected] /PEN fibrous composite membrane exhibited the ultra-high permeance (up to 11957.5 L·m −2 ·h −1 ·bar −1 ) for different oil–water emulsions while maintaining high-level rejection rate (99.13%), which was far beyond other MXene-based composite membranes reported before. Moreover, the fibrous composite membrane showed the satisfactory photocatalytic degradation rates for the methyl orange (15 ppm, 95.24%) and crystal violet (15 ppm, 95.61%) in 60 min, demonstrating the photocatalytic self-cleaning ability for organic pollutants. In addition, the fibrous composite membrane exhibited ∼ 99.99% E. coli growth inhibition, achieving the favorable antibacterial effect. Therefore, the low oil adhesion, photocatalytic self-cleaning, and antibacterial effect contributed to the synergistically enhanced anti-fouling, which enabled the membrane material to maintain high separation efficiency and long-term usage in complex multi-pollutant environments. The combination of high permeability and enhanced anti-fouling performance makes the fibrous composite membrane an ideal candidate for the fast purification of emulsified oily wastewater.
研究领域:
环境科学
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材料科学
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化学工程
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DOI
高影响因子
危险品化学品经营许可证（带存储）