Materials
·
2024
·Vol. 17
·期 15
·3747
·
IF 3.1
Ying Wu,Haijun Tang,Liying Kang,Hongfu Li,Naisheng Jiang
Rapid advancements and proliferation of electronic devices in the past decades have significantly intensified electromagnetic interference (EMI) issues, driving the demand for more effective shielding materials. Herein, we introduce a novel two-layer graphene nonwoven fabric (2-gNWF) that shows excellent EMI shielding properties. The 2-gNWF fabric comprises a porous fibrous upper layer and a dense conductive film-like lower layer, specifically designed to enhance EMI shielding through the combined mechanisms of reflection, multiple internal reflections, and absorption of electromagnetic waves. The 2-gNWF exhibits a remarkable EMI shielding effectiveness (SE) of 80 dB while maintaining an impressively low density of 0.039 g/cm3, surpassing the performance of many existing graphene-based materials. The excellent EMI shielding performance of 2-gNWF is attributed to the multiple interactions of incident electromagnetic waves with its highly conductive network and porous structure, leading to efficient energy dissipation. The combination of high EMI SE and low density makes 2-gNWF ideal for applications that require lightweight yet effective shielding properties, demonstrating the significant potential for advanced EMI shielding applications.
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
DESALINATION
·
2022
·
IF 11.211
Guangze He,Zheng Li,Yuxiao Liu,Meijun Liu,Chuntao Zhu,Lanhe Zhang,Haifeng Zhang
Effective modification strategies contribute to high adsorption capacity , separation efficiency and anti-fouling properties of ion-imprinted membranes. The design of a homogeneous and hydrophilic interlayer between the substrate membrane and ion-imprinted layer is crucial factor for the excellent performance of ion-imprinted membranes. In this study, a novel multilayered interlayer (SiO 2 @SP-PDA) was developed and uniformly coated on the substrate surface (PVDF membrane). The polydopamine (PDA) prepared via oxidation of sodium periodate (SP-PDA) increases the uniformity of SiO 2 @SP-PDA modification, which reduces the agglomeration of the ion-imprinted layer, and thereby boosts the adsorption capacity to 231.77 mg·g −1 . The prepared ion-imprinted membrane (SiO 2 @SP-PDA-IIM) exhibits a favorable anti-fouling property due to the incremental hydrophilicity and the presence of SiO 2 nano interlayer. Based on the XDLVO theory, it can be deduced that the SiO 2 modification increases the membrane surface electron donor tension (γ − ), which plays an essential role in enhancing the anti-fouling property of SiO 2 @SP-PDA-IIM. In this paper, the design of multilayered structure is of great significance to make the ion-imprinted membrane be a potential candidate for Li + efficient separation in natural water.
研究领域:
材料科学
·
环境工程
✓ 已验证
DOI
高影响因子
Materials Research Express
·
2019
·Vol. 6
·期 7
·075314
·
IF 1.449
Lu Chen,Chao Xiao,Yunlu Tang,Xian Zhang,Kang Zheng,Xingyou Tian
A multilayered thermally conductive composite with ternary system of heat conductive fillers-thermally conductive films-epoxy matrix was prepared through a facile process of layer-by-layer stacking, pre-curing and hot-pressing. The thermally conductive films (boron nitride nanosheets/cellulose nanofiber) with high in-plane thermal conductivities were employed as the heat conductive medium, while the platelet-shaped hexagonal boron nitride and the particle-shaped aluminum nitride were utilized as heat conductive fillers for enhancing the perfection of the thermally conductive network. A horizontally heat conductive network was constructed within the epoxy matrix under the joint contribution of the horizontally aligned hexagonal boron nitride platelets and the parallelly spread thermally conductive films through hot-pressing. The aluminum nitride particles acted as linking points, filling the gaps between hexagonal boron nitride platelets, while constructing the thermally conductive path in the vertical direction. Thanks to the introduction of thermally conductive films and the good orientation of boron nitride platelets, the in-plane thermal conductivities of the composites increased with increasing of film layer number. With film layer number of 9, and filler content of 30 wt% (aluminum nitride/boron nitride (1:1)), the in-plane thermal conductivity of the composite was as high as 8.53 W m−1 * K, which showed an enhancement of 4165% than that of the pure epoxy matrix, and an improvement of 613% compared to that of the composite without multilayered structure. Meanwhile, the out-of-plane thermal conductivity exhibited a slightly deceased tendency as film layer number increased, but it still reached 0.87 W m−1 * K with film layer number of 9, which was 335% higher than that of the pure epoxy. In addition, the multilayered composite also possessed good thermal stability, enhanced stiffness, as well as low dielectric constant and dielectric loss, which shows a potential application in thermal management for packaging of integrated circuit and microelectronic devices.
研究领域:
材料科学
·
热管理技术
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Xingzhen Zhang,Yuzhang Zhu,Feng Zhang,Yuyue Mo,Yatao Zhang,Wangxi Fang,Jian Jin
Developing a membrane integrating high permeating flux and high separation efficiency for the purification of oil-in-water emulsions is significant but still challenging due to the perm-selectivity “trade-off”. Herein, we design a nanofibrous membrane with special hydrophilic/hydrophobic intercalated multilayer structure to efficiently separate oil-in-water emulsions. The multilayer membrane is composed of alternatively deposited hydrophilic polyacrylonitrile (PAN)/ZnO nanoneedles composite fibers layers and hydrophobic poly(vinylidene fluoride-co- hexa -fluoropropylene) (PVDF-HEP) fibers layers, where vertically grown ZnO nanoneedles pierce through PVDF-HEP fibers layer and connect the whole membrane up and down. The special multilayer structure can exert the synergistic effect between size sieving mechanism of hydrophilic layers and coalescence mechanism of hydrophobic layers during the separation of oil-in-water emulsion, which overcomes the size mismatch between large pore sizes of membrane and small droplets of emulsion. With the mean pore size of 1.1 μm for the multilayer composite membrane, a high permeating flux up to 32,100 L m -2 h −1 bar −1 with the oil content in filtrate as low as 4 mg L −1 for treating toluene-in-water emulsion (a mean droplet size of 650 nm) was achieved. The separation performance is obviously superior to the hydrophilic membrane without hydrophobic layers intercalated structure. Our work provides a new strategy for developing hydrophilic-hydrophobic composite membranes to alleviate the trade-off between permeating flux and separation efficiency in oil/water emulsion separation through rationally designing the membrane structure.
研究领域:
材料科学
·
环境工程
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2020
·
IF 3.83
Jianwen Ge,Li Liu,Yu Cui,Rui Li,Fandi Meng,Fuhui Wang
Whereas growing numbers of strong-absorption materials have been synthesized in recent years, it is also necessary to design broad-bandwidth, low-thickness, high-intensity absorbers. The ternary Fe 3 O 4 @SiO 2 @MnO 2 hybrids were fabricated via hydrothermal and hydrolysis processes, combined with typical core-shell structure characteristics and heterogeneous properties, further generating interfacial polarization behavior and enhancing anisotropy. Investigations of micromorphology manifested the hierarchical characteristic via the presence of inner mesoporous Fe 3 O 4 cores, outer SiO 2 layers (approximately 10 nm) and MnO 2 nanosheets as the surface of the hybrids. On the basis of rational design, the optimized multi-layers absorber exhibited excellent absorption performance with optimal reflection loss (RL min ) of −50.2 dB at 13.9 GHz, and the effective absorption band (EAB) is up to 5.1 GHz from 11.5 GHz to 16.6 GHz with the thickness of 2.6 mm. Due to the large surfaces, high porosity as well as the synergistic effect derived from the magnetic Fe 3 O 4 cores and dielectric SiO 2 @MnO 2 layers, this effective strategy may be endowed with high potential to design high-efficient absorbers.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2020
·
IF 7.1
Xin Li,Yanli Lu,Zhenghan Shi,Guang Liu,Gang Xu,Zijian An,Huan Xing,Qingmei Chen,Ray P.S. Han,Qingjun Liu
Two-dimensional (2D) materials provides large surface area for H 2 O molecules adsorption and interaction, which has been utilized in humidity sensing and noninvasive monitoring of physiological events such as respiration. However, disadvantages including slow response or modest response hinder the accurate tracking of human breath. Hence, MXene , the new member of 2D material family with excellent hydrophilicity and tunable conductivity, has drawn much attention. In this work, the enhanced response of Ti 3 C 2 T x MXene to H 2 O molecules was achieved by onion-inspired assembling of Ti 3 C 2 T x MXene and chitosan-quercetin hybrid layer-by-layer. The chitosan-quercetin modified multilayers suppress the degradation of MXene in environment, exhibiting superior response (317 % at 90 % RH), ultrafast response (0.75 s), and long-term stability (more than 15 days). Integrated with a wireless flexible detecting tag, the multilayers realized wearable human respiration monitoring with robust, accurate tracking capacity, offering a facile and feasible method for versatile physiological monitoring based on humidity sensing.
研究领域:
材料科学
·
生物医学工程
·
传感器技术
✓ 已验证
产品关联
DOI
高影响因子
CARBOHYDRATE POLYMERS
·
2016
·
IF 4.219
Hui Li,Jin Yang,Pan Li,Tianqing Lan,Lincai Peng
We proposed a green and facile method to fabricate superhydrophobic paper in this study, which is layer-by-layer (LBL) deposition of TiO 2 nanoparticles/sodium alginate (ALG) multilayers on paper surface followed by an adsorption treatment of colloidal carnauba wax. The formation of TiO 2 /ALG multilayers on paper surface was characterized by X-ray photoelectron spectroscopy (XPS), zeta potential measurement, scanning electron microscopy (SEM) and atomic force microscopy (AFM), respectively. The wetting property of modified paper was investigated by water contact angle (WCA) measurement. Moreover, the modified paper tensile strength has been evaluated. The results showed that WCA of paper modified with a wax-treated (TiO 2 /ALG) 3.5 multilayer reached up to 151.5°, and this obtained superhydrophobic paper exhibited improved tensile strength (increased by 4.1% compared to the pristine paper), excellent moisture-proofing property and high strength stability under high relative humidity condition, which might has a great potential for use in the liquid paper packaging and moisture-proof paper packaging.
研究领域:
材料科学
·
表面工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2018
·
IF 3.057
Yupeng Ma,Hang Luo,Ru Guo,Kechao Zhou,Dou Zhang
It is challenging to achieve high energy density in conductive fillers/polymer nanocomposites due to their extremely low breakdown strength . In this paper, a novel multi-component and multilayer-structured nanocomposite was designed and investigated, consisting of Ba 0.8 Sr 0.2 TiO 3 decorated graphene (BST @ RGO)/poly(vinylidene fluoride-chlorotrifluoroethylene) copolymer (P(VDF-CTFE)) composites (R-Layer) as interlayer, and BaTiO 3 /P(VDF-CTFE) composites (B-Layer) as surface layer. The multilayer-structured nanocomposites were prepared through layer-by-layer solution casting method. Enhanced breakdown strength, energy density, dielectric constant and low dielectric loss were simultaneously obtained in the nanocomposites by the multilayer structure. The maximum dielectric constant of the composites with multi-layered structure was approximately 14, which was increased by 16.67% compared to the pure P(VDF-CTFE) layer, and the dielectric loss was as low as 0.047 at 1 kHz, even lower than pure P(VDF-CTFE) in frequency range from 10 kHz to 1 MHz. The breakdown strength and energy storage density of BRB-3 nanocomposites with 3 R-Layers reached to 220 kV mm −1 and 6.49 J cm −3 , respectively. These results demonstrated that designing multi-component and multilayer-structured nanocomposites was an effective approach to fabricate high performance dielectric nanocomposites.
研究领域:
材料科学
·
电气工程
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES B-BIOINTERFACES
·
2012
·
IF 3.456
Shufang Yu,Guolin Wu,Xin Gu,Jingjing Wang,Yinong Wang,Hui Gao,Jianbiao Ma
A dually responsive nanocarrier with multilayer core–shell architecture was prepared based on Fe 3 O 4 @SiO 2 nanoparticles coated with mPEG-poly( l -Asparagine). Imidazole groups (pK a ∼ 6.0) were tethered to the side chains of poly( l -Asparagine) segments by aminolysis. These nanoparticles were expected to be sensitive to both magnetic field and pH environment. The obtained materials were characterized with FTIR, dynamic light scattering, ζ -potential, TEM, TGA and hysteresis loop analysis. It was found that this Fe 3 O 4 @SiO 2 –polymer complex can form nano-scale core–shell–corona trilayer particles (∼250 nm) in aqueous solution. The Fe 3 O 4 @SiO 2 , poly( l -Asparagine) and mPEG segments serve as a super-paramagnetic core, a pH-sensitive shell, and a hydrophilic corona, respectively. An antitumor agent, doxorubicin (DOX), was successfully loaded into the nanocarrier via combined actions of hydrophobic interaction and hydrogen bonding. The drug release profiles displayed a pH-dependent behavior. DOX release rate increased significantly as the ambient pH dropped from the physiological pH (7.4) to acidic (5.5). This is most likely due to protonation and a change in hydrophilicity of the imidazole groups in the poly( l -Asparagine) segments. This new approach may serve as a promising platform to formulate magnetic targeted drug delivery systems.
研究领域:
生物医学工程
·
材料科学
·
药学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ADVANCED ENGINEERING MATERIALS
·
2022
·Vol. 24
·期 9
·2200098
·
IF 4.122
Qiguo Chen,Kai Zhang,Li Huang,Yibin Li,Ye Yuan
The electromagnetic interference (EMI) shielding performance of reduced graphene oxide (rGO) foam is restricted to its poor conductivity and macro-monotonic structure. In this work, highly conductive MXene nanosheets are introduced into graphene oxide (GO) solution and multilayer structures were designed to improve the EMI shielding performance of graphene foam. The multilayer rGO/MXene composite foam shows an excellent EMI shielding effectiveness of more than ≈28 dB in C and ≈35 dB in X band. Meanwhile, it reveals an outstanding heat insulation performance equaling to air (0.025 W m −1 K). The macro multilayer and microporous structure plays a prominent role in the EMI shielding and heat insulation performance. This work provides valuable ideas for designing multifunctional EMI shielding materials for the next generation of smart electronic devices.
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
BIOMACROMOLECULES
·
2015
·
IF 5.75
Chuanxiong Nie,Lang Ma,Chong Cheng,Jie Deng,Changsheng Zhao
Combining the advantages of the fibrous nanostructure of carbon nanotubes (CNTs) and the bioactivities of heparin/heparin-mimicking polyanions, functional nanofibrous heparin or heparin-mimicking multilayers were constructed on PVDF membrane with highly promoted endothelialization and antithrombogenic activities. Oxidized CNT (oCNT) was first functionalized with water-soluble chitosan (polycation), then enwrapped with heparin or a typical sulfonated heparin-mimicking polymers (poly(sodium 4-styrenesulfonate-co-sodium methacrylate)) to construct the multilayers. Then, the surface-deposited multilayers were constructed via electrostatic layer-by-layer assembly of the functionalized oCNTs. The scanning electron microscope and atom force microscope images confirmed that the coated multilayers exhibited nanofibrous and porous structure. The live/dead cell staining and cell viability assay results indicated that the coated nanofibrous multilayers had excellent compatibility with endothelial cells. The cell morphology observation further confirmed the promotion ability of surface endothelialization due to the coated heparin/heparin-mimicking multilayers. Further systematical evaluation on blood compatibility revealed that the surface heparin/heparin-mimicking multilayer-coated membranes also had significantly improved blood compatibility including restrained platelet adhesion and activation, prolonged blood clotting times, and inhibited activation of coagulation and complement factors. In summary, the proposed nanofibrous multilayers integrated endothelialization and antithrombogenic properties; meanwhile, the heparin-mimicking coating validated comparable performances as heparin coating. Herein, it is expected that the surface coating of nanofibrous multilayers, especially the facilely constructed heparin-mimicking coating, may have great application potential in biomedical fields.
研究领域:
生物医学工程
·
材料科学
·
细胞生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Nano
·
2018
·
IF 13.709
Xiaodong Qi,Dan Zhang,Zhongbao Ma,Wenxin Cao,Ying Hou,Jiaqi Zhu,Yang Gan,Ming Yang
We overcome the fundamental dilemma in achieving hard materials with self-healing capability by integrating an epidermis-like hierarchical stratified structure with attractive mechanical and barrier properties of graphene oxide and show that such biomimetic design enables a smart hierarchical coating system with a synergetic healing effect and a record-high stiffness (31.4 ± 1.8 GPa)/hardness (2.27 ± 0.09 GPa) among all self-healable polymeric films even comparable to that of tooth enamel. A quasi-linear layer-by-layer (LBL) film with constituent graphene oxide is deposited on top of an exponential LBL counterpart as a protective hard layer, forming a hierarchical stratified assembly mimicking the structure of epidermis. The hybrid multilayers can achieve a complete restoration after scratching thanks to the mutual benefit: The soft underneath cushion can provide additional polymers to assist the recovery of the outer hard layer, which in turn can be a sealing barrier promoting the self-healing of the soft layer during stimulated polymer diffusion. The presenting hybridization mode of LBL assembly represents a promising tool for integrating seemingly contradictory properties in artificial materials with potential performances surpassing those in nature.
研究领域:
材料科学
·
生物医学工程
✓ 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）