CELLULOSE
·
2023
·Vol. 30
·期 8
·5171-5185
·
IF 5.7
Zhao Bencheng,Li Chengze,Chen Yongfang,Tian Qiong,Yurekli Yılmaz,Qiu Fengxian,Zhang Tao
To handle the increasingly harsh living space caused by extreme temperatures and floods of electromagnetic waves, wearable materials have been attracting much attention for decades due to their good versatile compatibility and precise utility. In this work, a Janus MXene/cellulose/ZnO nanorods membrane for accurate on-demand personal thermal management and electromagnetic interference shielding was fabricated via hydrothermal treatment and vacuum-assisted filtration, followed by a hydrophobization process. The ZnO nanorod side of obtained Janus membrane exhibits a high visible reflectance (96.3%) and infrared emissivity in the atmospheric window band (0.837). The corresponding visible absorption and average infrared reflectivity (5–25 μm in wavelength) of the MXene side are over 90% and 0.7, respectively. Remarkable temperature differences on both sides (7 °C increment on MXene side and 5 °C reduction on ZnO side compared to bare wooden board) were achieved in the validation test under direct sunshine, reflecting to the great optical properties and radiative thermal management performances of the obtained membrane. Moreover, the water contact angles (≥ 120°) indicated the hydrophobicity and associated stain resistance of this membrane. Active Joule heating and electromagnetic interference shielding characteristics have been successfully introduced into the Janus membrane by means of the integration of MXene. A rapid increase in temperature to 75 °C was attained within a 1 min of low voltage (2 V) applying. The effectiveness of the electromagnetic shielding (~ 30 dB) was higher than the commercial shielding materials. The results in general, provide a promising solution to protecting people from temperature extremes and electromagnetic waves interference in modern living space.
研究领域:
材料科学
·
环境科学
·
物理学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2023
·Vol. 12
·期 3
·1617-1628
·
IF 11.9
Meng Ma,Wenqin Shao,Qindan Chu,Wenting Tao,Si Chen,Yanqin Shi,Huiwen He,Yulu Zhu,Xu Wang
With the strong support of the government for emerging technology industries, electromagnetic waves have brought convenience to people's lives, but also become an undeniable new source of pollution. Therefore, it is vital to develop new high-performance electromagnetic shielding materials. Herein, we designed a well-structured asymmetrical gradient multilayer composite film by constructing a controllable electromagnetic gradient. Using cellulose nanofibers as the matrix, a layer-by-layer filtration method was used to rationally distribute FeCo@rGO and MXene fillers to build an ordered multilayer structure that provides alternating conductive and magnetic gradients. Owing to gradient absorption shielding and reflection mechanisms for electromagnetic waves within the film layer, the EMI shielding efficiency (EMI SE) of the asymmetrical gradient alternating six-layer composite film reached 45.2 dB (X-band), and the reflection coefficient was reduced to 0.71 when 20 wt% filler was added. In addition, this composite film has good thermal conductivity and mechanical properties, exhibiting thermal conductivity of 2.90 W (m−1 K−1) and tensile strength of 26.2 MPa. This strategy provides a feasible approach for designing electromagnetic shielding composite materials with adjustable electromagnetic properties and has significant practical significance in expanding the application of MXene-based composite materials.
研究领域:
材料科学
·
电磁学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Bai Jiang,Na Li,Yan Wang,Zuming Hu,Jing Zhu,Junrong Yu
In order to deal with the more complex electromagnetic radiation environment, there is highly desirable to manufacture a high-performance electromagnetic shielding material with excellent electromagnetic shielding efficiency, flexibility, thermal properties, fatigue resistance , and other qualities. In this paper, we fabricated an ultralight, flexible, and heat-resistant poly-m-phenylene isophthalamide (PMIA)/Ag nanowires(AgNWs)/Ni composite nanofiber film via electrospinning, spray coating, and electroless plating . Compared with different AgNWs spraying contents, the highest electromagnetic shielding effectiveness, about 96 dB with a thickness of ∼150 µm, is generated by spraying 33.333 mg/cm 2 AgNWs suspension. Additionally, because of the benefit of the PMIA, this PMIA/AgNW/Ni composite membrane maintains a constant EMI SE value (over 90 dB) after a high-temperature process under 200 °C, which only decreases by 3.33 %. The excellent performance of the material is due to its large porosity and sandwich structure, which can dissipate electromagnetic waves within the material, with only a very small portion of the electromagnetic waves passing through it. Therefore, this material has a potential application for use in diverse harsh settings.
研究领域:
材料科学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
Materials
·
2023
·Vol. 16
·期 13
·4831
·
IF 3.4
Hongbo Liu,Jiajie Huang,Bingzhi Guo
Dopamine was used to modify polytetrafluoroethylene (PTFE) in order to obtain functional polydopamine (PDA) surface-modified PTFE microporous film (PTFE@PDA). Ag was deposited on the surface of PTFE@PDA using electroless plating in order to obtain Ag-wrapped PTFE@PDA film (PTFE@Ag). A liquid-phase chemical reduction method was employed to prepare nickel nanochains. A Ni@PVDF cast film was obtained by mechanically blended nickel nanochains and polyimide (PVDF). The above two films were hot pressed to give a flexible, ultra-thin, and highly effective electromagnetic shielding composite film with a “3+2” layered structure. IR, XRD, and TEM results showed the PTFE@PDA film surface was coated by a tight plating layer of Ag particles with a particle size of 100~200 nm. PTFE@Ag+Ni@PVDF composite film exhibited excellent electromagnetic shielding effectiveness, with the conductivity of 7507.5 S/cm and the shielding effectiveness of 69.03 dB in the X-band range. After a 2000-cycle bending, this value still remained at 51.90 dB. Furthermore, the composite film presented excellent tensile strength of 62.1 MPa. It has great potential for applications in flexible and wearable intelligent devices.Keywords:electromagnetic shielding;Ag;PTFE;composite film
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2020
·
IF 3.83
Li Li,Yanjun Cui,Zhixia Zhang,Peng Tu,Haipeng Gong,Ping Li
In this work, a novel 3D graphene/Fe 3 O 4 (G-Fe 3 O 4 ) nanocomposite was prepared by a facile one-pot hydrothermal process used to be adulterated into the varnish as an anticorrosive and electromagnetic shielding paint. It is confirmed that the skeleton structure of graphene can effectively inhibit Fe 3 O 4 agglomeration by Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) technique, and the G-Fe 3 O 4 nanocomposites can be well dispersed in the varnish for a longtime without settling. The graphene/Fe 3 O 4 composite varnish shows excellent corrosion resistance both in city water and seawater , besides its corrosion resistance is also superior to that of ordinary anti-rust paint. Moreover, the electromagnetic shielding test confirms that the as-prepared composite varnish shows well electromagnetic shielding performance. This new type of composite varnish has a broad application prospect to be used as urban exterior wall and ships paint.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2024
·
IF 7.7
Yuejie Qiu,Leping Zhang,Fenglun Zhang,Xichuang Cheng,Li Ji,Jianxin Jiang
XOS production from lignocellulose using organic carboxylic acids and alkyd acids has been widely reported. However, it still faces harsh challenges such as high energy consumption, high cost, and low purity. Pyruvic acid (PYA), a carbonyl acid with carbonyl and carboxyl groups, was used to produce XOS due to its stronger catalytic activity. In this work, XOS was efficiently prepared from COS in an autoclave under the condition of 0.21 M PYA-121 °C-35 min. The total yield of XOS reached 68.72 % without producing any toxic by-products, including furfural (FF) and 5-hydroxymethylfurfural (5-HMF). The yield of xylobiose (X 2 ), xylotriose (X 3 ), xylotetraose (X 4 ), and xylopentaose (X 5 ) were 20.58 %, 12.47 %, 15.74 %, and 10.05 %, respectively. Meanwhile, 89.05 % of lignin was retained in the solid residue, which provides a crucial functional group for synthesizing layered carbon materials (SRG-a). It achieves excellent electromagnetic shielding (EMS) performance through graphitization, reaching −30 dB at a thickness of 2.0 mm. The use of a PYA catalyst in the production of XOS has proven to be an efficient method due to lower temperature, lower acid consumption, and straightforward operation.
研究领域:
生物化学
·
材料科学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2024
·Vol. 35
·期 25
·1-13
·
IF 2.8
Xue Longlong,Xiong Shisheng
In the anti-wind–sand environment, it is challenging to find a single material that fulfills all the required functional application requirements, such as shielding performance, mechanical performance, chemical performance, reliability, and economic efficiency. Herein, a multi-layer electromagnetic shielding composite sheet specifically was designed for large military bases in anti-wind–sand environments. The composite material structure comprises laminated aluminum foil, PET film, and Oxford fabric, utilizing an acrylic emulsion pressure-sensitive adhesive that was modified with superior nano-SiO 2 . The results showed that the electromagnetic interference shielding of Al Mylar foil (0.03 mm) measured 88 dB, whereas the medium gauge foil recorded 84.7 dB after salt spray test for 288 h. The samples of Oxford fabric showed an increase in tensile and tearing strength as the fabric density increases, but the rate of increase decreases gradually. The shear and peel strengths of acrylic emulsion modified by hydrophobic nano-SiO 2 were 67.1 MPa and 24.3 N/m, respectively, with a blending ratio of 7 wt%. Finally, we handpicked 140 g/m 2 of Oxford cloth, 0.03 mm of aluminum foil with PET films, and acrylic emulsion pressure-sensitive adhesive containing 7 wt% hydrophobic nano-SiO 2 for the lamination. The samples have good aging performance, with electromagnetic shielding performance, shear strength, peel strength, and weight loss declining less than 10% at 85 °C and 85% RH for 1000 h.
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
WOOD SCIENCE AND TECHNOLOGY
·
2023
·Vol. 57
·期 6
·1467-1483
·
IF 3.4
Ba Zhichen,Liang Daxin,Xiao Zefang,Wang Yonggui,Wang Haigang,Xie Yanjun
In living spaces where wood is commonly used for both construction and decoration, it is crucial to minimize electromagnetic pollution and the risk of fire. In this study, we applied aniline treatment to wood in situ and examined its impact on electromagnetic shielding and fire resistance. By enabling in situ polymerization and the deposition of polyaniline particles within the wood, we enhanced the wood’s conductivity while maintaining its porous structure, thereby improving its ability to absorb microwaves. The results indicated that wood species with low density exhibited higher electromagnetic shielding efficiency after treatment due to their greater polyaniline loading. Specifically, an specific electromagnetic shielding efficiency up to 65.8 dB cm −3 g −1 was achieved on the cross sections of treated wood. Furthermore, the total heat release and smoke production decreased by 43.9% and 66.7%, respectively, while the wood char mass increased by 66.3%. The results demonstrated that polyaniline-treated wood with bifunctional features could serve as a promising candidate in this field.
研究领域:
材料科学
·
林学
·
化学工程
✓ 已验证
DOI
高影响因子
PROGRESS IN ORGANIC COATINGS
·
2024
·
IF 6.5
Yuhuan Xu,Meng Pei,Xiao Zhan,Jingyu Du,Daohai Zhang
MXene-based materials that effectively deal with harmful electromagnetic waves are attracting more and more attention. In this paper, MXene hydrogels with good properties were prepared using polyvinyl alcohol (PVA) and polyacrylic acid (PAA) to construct a three-dimensional framework for hydrogels, and then adding homemade MXene materials to take advantage of their excellent properties, which resulted in the formation of an electrically conductive framework. The study shows that MXene-10 has a tensile strength of 0.29 MPa and an electrical conductivity of 156.24 S/mm. In addition, electromagnetic shielding (EMI) of 33.6 dB can be achieved when the MXene hydrogel is only 2 mm.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Qi Liu,Pei-Lin Wang,Wei Zhang,Tian Mai,Meng-Yu Qi,Lei Chen,Junfeng Li,Ming-Guo Ma
In the era of increasing reliance on electronic devices, the development of flexible smart composite films that offer multifunctional capabilities such as electromagnetic shielding, sensing, infrared stealth, and autonomous heating is becoming increasingly significant. In this study, we fabricated polydopamine-modified cellulose scaffold/MXene composite films (PCM) using a densification strategy, resulting in films with a thickness of only 33 μm, outstanding tensile strength of 235.28 MPa, and excellent electromagnetic shielding effectiveness of 44.6 dB. The PCM also demonstrates remarkable electrothermal performance, reaching temperatures of up to 610 °C at 5 V, and exhibits excellent photo-thermal conversion performance, along with good cycling stability and tunability. Additionally, the PCM’s low infrared emissivity provides it with exceptional infrared stealth capabilities, effectively concealing a high surface temperature ranging from 250 °C to 25 °C. The PCM’s ability to detect human body movement and light-driven actuation for bionic motions underscores its flexibility and utility as a sensor. Therefore, this efficient and versatile approach provides a promising method for synthesizing multifunctional MXene-based composite films, achieving satisfactory mechanical properties, high electromagnetic interference shielding, and effective thermal management for wearable smart devices and military applications.
研究领域:
材料科学
·
智能设备
·
多功能材料
✓ 已验证
产品关联
DOI
高影响因子
COMPOSITES SCIENCE AND TECHNOLOGY
·
2022
·
IF 9.879
Yifei Qu,Xiang Li,Xiu Wang,Hongqi Dai
The electromagnetic interference and heat accumulation pose a significant challenge for the traditional high-density single-function electromagnetic shielding materials in advanced flexible integrated electronics. Herein, nano-silver flakes (AgNFs, reflective layer), MXene (Ti 3 CNTx, loss layer) and silver nanowires (AgNWs, heat conduction and shielding layer) constructed ordered multi heterogeneous layers high-performance flexible electromagnetic shielding functional composites (AMA composites). Especially the composites exhibited outstanding electromagnetic interference shielding efficiency (EMI SE) of 70.96 dB even with an extremely thin coating of 25 g/m 2 , which is 350% higher than that of the commercial standard (20 dB). It is worth noting that the AMA composites also possessed certain qualities such as superior thermal conductivity , flame retardancy, chemical resistance, high-temperature resistance (25 °C–100 °C), and mechanical properties (tensile strength of 44.4 MPa, Young's modulus of 0.6 GPa). The composites display application possibilities in highly integrated advanced flexible electronic products and wearable electronic devices, as well as provide structural design and research ideas for the usage of a new MXene material (Ti 3 CNTx) in electromagnetic shielding composite materials.
研究领域:
材料科学
·
电子工程
✓ 已验证
DOI
高影响因子
Polymers
·
2022
·Vol. 14
·期 7
·1328
·
IF 4.967
Fengyu Wen,Shu Li,Rui Chen,Yashu He,Lei Li,Lin Cheng,Jierun Ma,Jianxin Mu
With the rapid rise of new technologies such as 5G and artificial intelligence, electronic products are becoming smaller and higher power, and there is an increasing demand for electromagnetic interference shielding and thermal conductivity of electronic devices. In this work, hydroxyphenolphthalein type polyetherketone grafted carboxy carbon nanotube (PEK-C-OH-g-MWCNTs-COOH) composites were prepared by esterification reaction. The composites exhibited good thermal conductivity, and compared with (MWCNTs-COOH/PEEK) with randomly distributed fillers, (PEK-C-OH-g-MWCNTs-COOH) composites showed a significant advantage, with the same carbon nanotube content, the thermal conductivity of PEK-C-OH-g-MWCNTs-COOH/PEEK (30 wt%) was 0. 71 W/(m-K), which was 206% higher than that of PEEK and 0.52 W/(m-K) higher than that of MWCNTs-COOH/PEEK (26.1 wt%). In addition, the PEK-C-OH-g-MWCNTs-COOH) composite exhibited excellent electrical conductivity and electromagnetic shielding (SE). The SE of 30 wt% PEK-C-OH-g-MWCNTs-COOH/PEEK is higher than the commercially used standard whose value is 22.9 dB (8.2 GHz). Thus, this work provides ideas for the development of thermally conductive functionalized composites.Keywords:thermal and electrical conductivity;electromagnetic interference shielding;surface treatments;composites
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）