NANOTECHNOLOGY
·
2022
·Vol. 33
·期 16
·165603
·
IF 3.953
Yongqin Hu,Chen Hou,Yuxia Shi,Jiamei Wu,Da Yang,Zhuili Huang,Yan Wang,Yufei Liu
Electromagnetic pollution seriously affects the human reproductive system, cardiovascular system, people's visual system, and so on. A novel versatile stretchable and biocompatible electromagnetic interference (EMI) shielding film has been developed, which could effectively attenuate electromagnetic radiation. The EMI shielding film was fabricated with a convenient solution casting and steam annealing with 2D MXene, iron oxide nanoparticles, and soluble polyurethane. The EMI shielding effectiveness is about 30.63 dB at 8.2 GHz, based on its discretized interfacial scattering and high energy conversion efficiency. Meanwhile, the excellent tensile elongation is 30.5%, because of the sliding migration and gradient structure of the nanomaterials doped in a polymer matrix. In addition, the film also demonstrated wonderful biocompatibility and did not cause erythema and discomfort even after being attached to the arm skin over 12 h, which shows the great potential for attenuation of electromagnetic irradiation and protection of human health.
研究领域:
材料科学
·
生物医学工程
·
电磁学
✓ 已验证
DOI
高影响因子
Journal of Nanotechnology
·
2025
·Vol. 2025
·期 1
·4194409
·
IF 4.1
Zahraa Jalood Nayyef,Nabil Kadhim Taieh,Ammar A. Beddai,Ying Li,Xi Liu,Adil Elrayah
New epoxy (EP)-based sandwich composites have enhanced mechanical performance and optimized cost-effectiveness, as a result of composites’ increasing popularity. This study aims to develop composites with 3, 5, and 7 layers of woven carbon fibers (WCFs) layered on 3D rayon-based graphite felt (3D RGF) as the core of the sandwich composites. Using WCFs as face sheet layers increases flexural strength and modulus. Flexural strength increases to 226.92 MPa, and modulus increases to 15.18 GPa with 3 WCFs layers. Five layers increase modulus to 25.43 GPa and flexural strength to 370.21 MPa. Seven layers provide the highest modulus of 31.38 GPa and flexural strength of 405.07 MPa. Diverse concentrations of nanosilica (0.01, 0.1, 0.5, and 0.8 wt%) were embedded within the core to bolster its mechanical properties. Using an in situ casting method, an EP resin solution was infused into the structure, forming a bicontinuous composite. This method significantly enhances the toughness and adhesion between the fibers and the EP resin, resulting in superior mechanical properties. EP alone has 57-MPa tensile strength, but three layers of WCFs increase it to 531.38 MPa, five layers increase it to 647.24 MPa, and seven layers increase it to 764.40 MPa. The minimum tensile modulus of EP is 2.75 ± 0.5 GPa. The modulus increases significantly when layers of WCFs are added, reaching 9.75 GPa with three layers, 14.96 GPa with five layers, and a maximum value of 23.44 GPa with seven layers. When a little amount of nanosilica was added, the flexural properties of composites were significantly affected. Among all concentrations, 0. 5 wt% nano-SiO 2 yielded the highest enhancement of flexural strength and modulus. At 0.1 wt% nanosilica, the flexural strength and modulus of the sandwich composites increase to 493.5 MPa and 30.5 GPa (23.4% and 24.5%). The peak occurs at 0.5 wt%, reaching 645.7 MPa and 41.5 GPa (61.4% and 69.4%). However, at 0.8 wt%, values drop to 560.1 MPa and 30.4 GPa, still showing 40.0% and 24.1% improvements. This study provides a new solution for reinforcing the mechanical properties of EP sandwich composites. Increasing the performance with nanofiller concentrations is also emphasized.
研究领域:
材料科学
·
机械工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2024
·Vol. 141
·期 33
·e55835
·
IF 2.7
Jia Xu,Haitao Zou,Yanqiao Jin,Qixi Zheng,Fanghui Lei,Yuxin Wu
To improve the comprehensive properties of polybutylene furandicarboxylate (PBF), 2,5-furandicarboxylic acid (2,5-FDCA), and aliphatic chain diol 1,8-octanediol and 1,4-butanediol were used as monomers to synthesize a series of bio-based polybutylene glycol-octanediol 2,5-furandicarboxylate (PBOF). The results showed that the chemical composition of PBOF could be controlled through the molar ratio of monomers. Compared with PBF, as the proportion of octanediol segments gradually increased, PBOF could gradually transform from semi-crystalline thermoplastic to amorphous form, and the glass transition temperature ( T g ) gradually decreased. The crystallization ability reduced but a part of the crystal area was still retained. The copolyesters still has a decomposition temperature above 370°C, indicating excellent thermal stability. The introduction of the octanediol segment significantly improved the tensile mechanical properties and flexibility of the POBF copolyester. These meet the requirements for the preparation of bio-based engineering plastics. The water absorption rate of PBOF showed that it may have certain degradable potential. PBOF copolyesters have potential application prospects in bio-based medical plastics and biodegradable packaging polymer materials after copolymerization modification.
研究领域:
材料科学
·
生物工程
✓ 已验证
产品关联
DOI
高影响因子
EUROPEAN POLYMER JOURNAL
·
2022
·
IF 5.546
Chuanhui Gao,Yiliang Gao,Sikai Wang,Yajie Dong,Yumin Wu,Yuetao Liu,Chuanxing Wang
Intelligent bio-based self-healing polymers are advanced and sustainable materials that are widely used in military, coatings and conductive materials. However, it is a challenging task to design unsaturated polyester materials with good stretching ability, efficient self-repair ability and sensitive sensing ability. In this paper, a class of bio-based unsaturated polyester is synthesized, and the functional self-repairing unsaturated polyester material is obtained through the control and design of its structure. Firstly, a flexible self-healing polyester crosslinking network (CPUBT-UPy) was prepared by introducing 2-urea-4[1H] pyrimidinone (UPy) into the unsaturated polyester chain through chain extension reaction and using polyethylene glycol (PEG) to regulate the structure and properties of unsaturated polyester. By adjusting the molar ratio of BDO and UPy, the elongation at break of the elastomer can reach 2020.94%, and the self-repair efficiency can reach 91.33%. After 5 repair cycles, the self-repair efficiency can still reach 79.01%. A flexible conductive material was prepared by the composite of CPUBT-UPy and 15% MWCNTs-NH2, and is further assembled into a universal flexible strain sensor, which showed excellent sensitivity to finger bending, speech and frowning. Finally, unsaturated polyesters also confer potential degradability on elastomers.
研究领域:
材料科学
·
智能材料
·
可持续材料
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Tai-Bao Yang,Ji-You Zong,De-Zhuang Jia,Ling Xu,Yue-Yi Wang,Li-Chuan Jia,Ding-Xiang Yan,Jun Lei,Zhong-Ming Li
Conductive composite textiles (CCTs) as multifunctional integrated platform provide an effective path for developing flexible electromagnetic interference (EMI) shielding composites. However, conventional CCTs suffer from EMI shielding performance failure or the loss of textile's intrinsic properties under large tensile strain. Hence, in this work, a stretchable EMI shielding CCT that retains the inherent attributes of textile is proposed via weft-knitting and in-situ chemical Ag deposition. The complete and continuous silver nanoparticles (AgNPs) conductive networks bring excellent conductivity (38560 S/m) and ultrahigh EMI shielding performance (80.1 dB) in unstretched state. When tensile strain is applied, the fibers are gradually straightened from flexural state within 40 % strain, and then begin to be stretched at bigger strains, which benefits from the weft-knitting structure. Therefore, the conductive networks on the fiber surfaces are well protected from damage in the initial 40 % strain range, resulting in a stable EMI shielding performance (51.7 dB) even after 1000 cycles of 100 % tensile strain. Crucially, the CCT preserves good air permeability , softness and lightness even though a series of modifications and tensile strains are applied. Other than the EMI shielding perforamnce, the excellent superhydrophobicity (the contact angle of 158°) imparts the textile with the capability to tackle complex environments easily. Moreover, the textile can readily be heated to 73.4 °C at a low voltage of 0.5 V, showing outstanding Joule heating performance. Even after a long period of heating (3600 s), the textile maintains superior thermal stability, indicating potential applications in wearable heaters. In brief, this multifunctional CCT has excellent comprehensive properties and is expected to further expand the applications of EMI shielding textiles.
研究领域:
材料科学
·
纺织工程
·
电子工程
✓ 已验证
DOI
高影响因子
AICHE JOURNAL
·
2021
·Vol. 67
·期 10
·e17373
·
IF 3.993
Kaiqiang Shi,Xiaozhi Xu,Siyuan Dong,Biao Li,Jingbin Han
Inorganic–organic hybrid films containing two-dimensional nanosheets have shown good gas barrier performance, but moderate tensile property, because of the rigid characteristics of covalent or ionic bonds between the assembly units. In this work, we used LDH nanosheets rich in hydroxyl groups as building units, followed by modification of tannic acid (TA), to assemble with polyethylene oxide (PEO) through hydrogen bonds. Compared with previous work, the tensile property and oxygen barrier performance of (TA@LDH/PEO) n films have been significantly improved. A 50-bilayer TA@LDH/PEO film, deposited on a 1 mm thick natural rubber substrate, results in a 29× reduction (contrast with bare substrate) in oxygen transmission rate and maintains its good barrier property even under a large elongation of 120%. The excellent tensile and gas barrier properties are attributed to the ductility of hydrogen bond network among building blocks and the significant prolongation of oxygen transmission path induced by LDH nanosheets.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
SCIENCE AND ENGINEERING OF COMPOSITE MATERIALS
·
2016
·Vol. 24
·期 5
·651-660
·
IF 0.467
Zajna Sherief,Guijun Xian,Sabu Thomas,Anu Ajith
In the present work, functionalized copper nanoparticles (FCuNPs) were grafted onto flax fibers, and the effects on the tensile properties, bonding strength to an epoxy resin, as well as the properties of the flax fiber-epoxy model composites were investigated. The copper nanoparticles were synthesized at ambient temperature by a chemical reduction method. The reduction of solution of copper chloride salt in the polyvinylalcohol medium was done by using sodium borohydrate. Ultraviolet-visible spectroscopy, transmission electron microscopy, and X-ray diffraction studies were used to characterize the size of the synthesized particles. The synthesized copper nanoparticles were applied to saturate the unidirectional flax natural fibers, whose surfaces were previously tailored with the cationic agent triethylammonium chloride. A remarkable improvement in the tensile strength by 75% and modulus by 50% for FCuNPs grafted flax fibers was found. Thermo-mechanical properties of the flax fiber reinforced epoxy composites were studied using DMTA. Finally, the anti-microbial analysis for composites was also conducted against Aspergillus niger spores, and enhanced anti-microbial performance was observed for treated fiber-based composites.
研究领域:
材料科学
·
复合材料工程
·
生物医学
✓ 已验证
产品关联
DOI
高影响因子
CHINESE JOURNAL OF CHEMISTRY
·
2023
·Vol. 41
·期 11
·1348-1354
·
IF 5.4
Xin-Yi Zhang,Kai-Li Tian,Jie Liu,Wittaya Ngeontae,Ai-Juan Zhao,Maxim V. Bermeshev,Shi-Qing Wong,Kaspars Traskovskis,Zhijian Chen,Xiang-Kui Ren
Comprehensive Summary A novel polyurethane polymer containing perylene diimide (PDI) unit and aniline segment, denoted as PU-PDI, was designed and synthesized. Their tensile property and photophysical characteristic were investigated using various experimental and theoretical techniques. It is found that the elongation of PU-PDIs can reach more than 1000%, indicating good tensile performance. Moreover, based on the photoinduced electron transfer mechanism, the aniline segments in polyurethane can quench the auto-fluorescence of PDI unit to a negligible value, which overcomes the intractable fluorescence drawbacks of conventional colour filters. The non-emissive characteristic, in combination with the good thermal stability and tensile property of PU-PDI, provides a feasible design strategy to fabricate optical filters with high display quality.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
Soft Matter
·
2023
·Vol. 19
·期 21
·3925-3932
·
IF 3.4
Wenjuan Xia,Ling Wang,Yijia Yu,Wenjin Wang,Zhaoqiang Wu,Hong Chen
Stretchable ionic conductive elastomers have been extensively studied due to their great application potential in the fields of sensors, batteries, capacitors and flexible robots. However, it is still challenging to prepare multifunctional ionic conductive elastomers with high mechanical strength and excellent tensile properties by a green and efficient method. In this study, we prepared PDES–DMA ionic conductive elastomers by a “one step” rapid in situ polymerization of AA/ChCl-type polymerizable deep eutectic solvents (PDES) and N,N-dimethylacrylamide (DMA) under ultraviolet (UV) irradiation. In addition to the characteristics of high mechanical strength (tensile strength of 9.27 MPa) and excellent tensile properties (elongation at break of 1071%), the PDES–DMA elastomer also has high transparency (>80%), strong self-adhesion (adhesion strength with glass surface 133.8 kPa) and self-healing properties. In addition, sensors based on the ionic conductive elastomer can be used to detect human movements such as finger, wrist, elbow, ankle and knee bending. Considering the convenience of the preparation method and the excellent versatility of the prepared PDES–DMA ionic conductive elastomer, we believe that the method proposed in this study has potential application prospects in the field of flexible electronics.
研究领域:
材料科学
·
传感器技术
·
柔性电子学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
POLYMER ENGINEERING AND SCIENCE
·
2024
·
IF 3.2
Zhihao Zhang,Zhiyuan Yao,Yujing He,Senlong Yu,Meijia Chen,Zhenjiang Shi,Jiaxu He,Hengxue Xiang,Meifang Zhu
In this work, a series of 1,4-cyclohexanedimethanol (CHDM)-based copolyester fibers are prepared by chemical structure design and crystal structure regulation. The chemical structures of poly(ethylene terephthalate-co-1,4-cyclohexanedimethylene terephthalate, (PETG)) copolyesters are first confirmed by 1 H- and 13 C-nuclear magnetic resonance which indicates that all copolyesters are random copolyesters. Then, the crystallization and melting behavior, thermal stability, and mechanical properties of copolyesters are significantly affected by the CHDM content and CHDM cis-trans isomerism ratio, showing that trans-CHDM can effectively improve the comprehensive performance of PETG copolyesters. Besides, the influence of the CHDM monomer (amount and cis-trans isomerism ratio) and melt-spinning drawing process on the crystal structure and mechanical properties (tensile strength, elongation) is also investigated by wide-angle X-ray diffraction, small-angle X-ray scattering, and tensile testing. Especially, the resultant PETG30-trans80 copolyester fibers exhibit good mechanical properties, and the tensile strength and elongation are 113.9 MPa and 136.5%, respectively. Therefore, our work provides a promising strategy for the fabrication of copolyester fiber. Highlights Bio-based PETG copolyester was obtained. Synergistic effects of a chemical structure and drawing process of PETG fiber were discussed. The influence of drawing process on crystallization, and orientation of fiber properties was studied.
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
Nano Energy
·
2023
·
IF 17.6
Hongtao Guo,Yuyang Shi,Fei Pan,Shuhuai Zheng,Xiaoli Chai,Yang Yang,Haojie Jiang,Xiao Wang,Lixin Li,Zhen Xiu,Jingli Wang,Wei Lu
The stretchable conductive materials with adjustable electromagnetic interference (EMI) shielding performance and other multifunctional integrated applications are remarkably desirable and challenging in flexible electronics. However, the existing stretchable materials often suffer from the decay of EMI shielding performance during the stretching process, which limits their practical applications. Meanwhile, it remains a great challenge to construct materials with ordered porous frameworks as integrated shielding devices. Incorporating porous structure will generate abundant interior surfaces/interfaces, facilitating multiple reflections of incident electromagnetic waves (EMWs). Herein, we employ ultrasound method to modify liquid metal (LM) with carbon nanotubes (CNTs), and further utilize an UV in-situ polymerization method to fabricate CNT@LM/polyacrylamide/gelatin (LMCPG) dual network hydrogel elastomer . The LMCPG hydrogel elastomer possesses high strength and durability, and its tensile strength reaches 117 kPa at 1033% strain owing to the high strength of the rigid network and the beneficial deformation ability of the flexible network. Deformable CNT@LM droplets elongate randomly during stretching process, which facilitates establishing more conductive paths. The EMI shielding capacity of the stretched elastomer can be controlled, achieving an intelligent on-off behavior, which exhibits a 211% increase at 200% strain in EMI shielding effectiveness (SE) compared with the undeformed state. Moreover, the LMCPG elastomer shows a significant triboelectric performance, which can provide power supply for flexible electronic devices, achieving an uninterrupted monitoring of the human body motion by devices. Therefore, as a flexible electronic material , it can offer a facile solution to achieve intelligent multifunctional integrated EMI shielding materials.
研究领域:
材料科学
·
柔性电子
·
智能材料
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Xin Jiang,Zhaopeng Hu,Shichao Xu,Bin Hu,Benteng Liu,Qiao Li,Yihu Song,Qiang Zheng
Stretchable electromagnetic shields have garnered significant attention in the burgeoning field of flexible devices, while traditional strategies developed to maintain adequate electromagnetic shielding performance under large strains are more challenging at low temperatures. Herein, elastic electromagnetic shielding films with segregated conductive network were produced by an extremely simple method of evaporating carboxylated nitrile butadiene rubber latex containing lithium bis(trifloromethanesulfonyl)imide doped poly(3,4-ethylenedioxythiophene): poly(styrene sulfonate). The films of 0.2 mm in thickness are highly stretchable at −20 °C and exhibit an electromagnetic interference shielding efficiency of more than 30 dB at 100 % strain and −10 °C. These properties underscore the potential of the films as effective stretchable EMI shields in low-temperature conditions. Experiments demonstrating the films' ability to block Bluetooth signals from ESP32 chip microcontrollers and electromagnetic waves from Tesla coils further confirm their usefulness, highlighting the practicality of protecting flexible devices in cold environments.
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
危险品化学品经营许可证（带存储）