Nano-Micro Letters
·
2025
·Vol. 17
·期 1
·1-16
·
IF 36.3
Zhou Yang,Zhang Wen,Pan Dong,Li Zhaoyang,Zhou Bing,Huang Ming,Mi Liwei,Liu Chuntai,Feng Yuezhan,Shen Changyu
The morphological distribution of absorbent in composites is equally important with absorbents for the overall electromagnetic properties, but it is often ignored. Herein, a comprehensive consideration including electromagnetic component regulation, layered arrangement structure, and gradient concentration distribution was used to optimize impedance matching and enhance electromagnetic loss. On the microscale, the incorporation of magnetic Ni nanoparticles into MXene nanosheets (Ni@MXene) endows suitable intrinsic permittivity and permeability. On the macroscale, the layered arrangement of Ni@MXene increases the effective interaction area with electromagnetic waves, inducing multiple reflection/scattering effects. On this basis, according to the analysis of absorption, reflection, and transmission (A–R–T) power coefficients of layered composites, the gradient concentration distribution was constructed to realize the impedance matching at low-concentration surface layer, electromagnetic loss at middle concentration interlayer and microwave reflection at high-concentration bottom layer. Consequently, the layered gradient composite (LG5-10–15) achieves complete absorption coverage of X-band at thickness of 2.00–2.20 mm with RL min of −68.67 dB at 9.85 GHz in 2.05 mm, which is 199.0%, 12.6%, and 50.6% higher than non-layered, layered and layered descending gradient composites, respectively. Therefore, this work confirms the importance of layered gradient structure in improving absorption performance and broadens the design of high-performance microwave absorption materials.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Jiao Huang,Jun Wang,Ziyang Liu,Fangming Shen,Jinjian Zhang,Yongyuan Ren,Xiaoli Zhan,Qinghua Zhang
Asymmetric electrolytes with both anode and cathode compatibility are promising candidates for high-energy–density batteries and high-safety lithium metal batteries (LMBs). However, the asymmetric electrolyte is still hindered by the complex multi-layer coating process, resulting in multiple internal interfaces of the electrolyte and poor battery performance. Herein, a one-step constructed asymmetric electrolyte with gradient distributions of 2‐ureido‐4[1H]-pyrimidinone functionalized carbon nanotubes (UPy-CNTs) is prepared via the dual driving forces of solvent evaporation and fluoropolymer migration. On the one hand, during the solvent evaporation process, based on the competitive effect between evaporation of solvent and diffusion of dispersions, the gradient distribution of asymmetric electrolyte can be constructed by enhancing evaporation and inhibiting uniform diffusion. On the other hand, due to the abundant hydrogen bonds between UPy and F, the gradient distribution of UPy-CNTs can be further promoted when the fluoropolymer spontaneously migrates to the surface. The gradient distribution of UPy-CNTs not only greatly increases Young’s modulus of the asymmetric electrolyte on the Li metal side, but also can adjust the Li + solvation structure to form a LiF-rich solid electrolyte interface (SEI), thereby inhibiting the generation and growth of lithium dendrites. Because of the ingenious structure of the asymmetric electrolyte, the ionic conductivity is 0.226 mS cm −1 and the Li + transferences number is 0.79. Prominently, Li||Li symmetric batteries can stably cycle for 2500 h at 0.1 mA cm −2 and 0.1 mAh cm −2 . In addition, Li||LFP batteries can maintain a high specific capacity of 146 mAh g −1 after 200 cycles at 0.5C.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
Small
·
2024
·
IF 13
Jinghan Zhang,Qiming Chen,Pengwei Zhao,An Cai,Xiaobin Fan,Wenchao Peng,Yang Li
NiFe-based materials, especially NiFe layered double hydroxides (LDHs), are recognized as the most promising non-precious metal electrocatalysts for alkaline oxygen evolution reaction (OER). However, the precisely designed distribution of active sites for enhancing activities is still significantly restricted due to the lack of reasonable modulation strategies. Herein, sulfur doped Ni/Fe gradient-distributed LDH (GD-NiFe LDH/S) is fabricated by facile air-induced strategy at room temperature. This strategy accelerates the growth process with abundant CO 2 and O 2 in air, which promotes the inward migration of Fe species, resulting in gradient distribution with Ni/Fe-rich edge/planar. This allows significant enhancement of Ni/Fe synergistic effect, which plays a vital role in OER. Moreover, the sharp pine-like morphology of GD-NiFe LDH/S endows superhydrophilicity/aerophobicity characteristics, facilitating electrolyte penetrating and oxygen releasing. The optimized GD-NiFe LDH/S delivers superior OER performance with low overpotentials of 234 and 270 mV at 10 and 100 mA cm −2 . The assembled anion exchange membrane water electrolyzer only requires 1.90 V at 1.0 A cm −2 and 2.10 V at 1.5 A cm −2 with robust stability for at least 130 h. This work introduces a facile air-induced strategy under room temperature to controllably design active site distributions of LDH for enhanced OER performance.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMISTRY OF MATERIALS
·
2024
·
IF 7.2
Kai Gou,Lei Wang,Minghui Wei,Jingtao Jiang,Gengsheng Weng
Morphing a two-dimensional (2D) plate into customized three-dimensional (3D) structures with complex curvatures is of great importance for developing the next generation of soft robotics, flexible devices, and sensors. Yet, the practical application of shape-morphing materials remains challenging due to the material’s inhomogeneous or discontinuous design. Herein, we demonstrate a biomorphogenesis-inspired paradigm that utilizes the ultraviolet mapping-based thickness gradient (UVM-TG) design for the shape transformation of bilayer-structured polymer sheets composed of a hydrogel layer and a hydrophobic polymer layer. The hydrophobic polymer layer as the passive layer is laser-engraved to create the thickness gradient distribution, which programs the dehydrative-shrinking-driven 3D shape transformation of the bilayer polymer sheets to deform into 3D structures with complex Gaussian curvatures, e.g., gourd and roadster. These 3D structures without uncontrollable surface buckling and wrinkles during those nonzero Gaussian curvature shape transformations exhibit reversible shaping/flattening switchability. Our UVM-TG design strategy, which does not require the inhomogeneous or discontinuous design of shape-morphing materials, establishes a facile strategy for fabricating shape-morphing materials.
研究领域:
材料科学
·
生物启发工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Dongyang Zhang,Yuxin Ouyang,Yong Wang,Limin Liu,Haijie Wang,Jia Cui,Mingyue Wang,Na Li,Hongyang Zhao,Shujiang Ding
Silicon is considered as a promising alternative to traditional graphite anode for lithium-ion batteries. Due to the dramatic volume expansion of silicon anode generated from the insertion of Li + ions, the binder which can suppress the severe volume change and repeated massive stress impact during cycling is required greatly. Herein, we design a gradient-distributed two-component binder (GE-PAA) to achieve excellent cyclic stability, and reveal the mechanism of high energy dissipative binder stabilized silicon electrodes. The inner layer of the electrode is the polyacrylic acid polymer (PAA) with high Young’s modulus, which is used as the skeleton binder to stabilize the silicon particle interface and the electrode structure. The outer layer is the gel electrolyte polymer (GE) with lower Young’s modulus, which releases the stress generated during the lithiation and de-lithiation process effectively, achieving the high structural stability at the molecular level and silicon particles. Due to the synergistic effect of the gradient binder design, the silicon electrode retains a reversible capacity of 1557.4 mAh g - 1 after 200 cycles at the current density of 0.5 C and 1539.2 mAh g - 1 at a high rate of 1.8 C. This work provides a novel binder design strategy for Si anode with long cycle stability.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2024
·
IF 5.6
Yanran Sun,Yu Cheng,Yanhu Zhan,Yanyan Meng,Limin Man,Na Pan,Hesheng Xia,Marino Lavorgna
Plant oil–based waterborne polyurethane (WPU) films with conductive fillers are suitable candidates as elastomers for electromagnetic interference (EMI) shielding and thermal management, conforming to sustainable development. However, the synthesis of the above WPU films is a major challenge. Herein, castor oil–based WPU/silver nanowire (c-WPU/AgNW) films, the integration of high-performance EMI shielding and excellent thermal management, were obtained via designing AgNW gradient distribution. The gradient distribution induced AgNWs to create perfect thermal and electrical pathways at the bottom of the as-prepared films. The c-WPU/AgNW gradient films exhibited excellent electrical conductivity (64.1 S m −1 ), shielding effectiveness (58.1 dB), shielding effectiveness/thickness (1236.2 dB cm −1 ), and in-plane thermal conductivity (1.67 W m −1 K −1 ) when their AgNW content and thickness were 9.1 wt% and 0.47 mm, respectively. The insolation of the 7.0 wt% AgNW-loaded c-WPU/AgNW film after 40 d in the atmosphere maintained 81 % shielding effectiveness of original samples, demonstrating good durability. The fabricated c-WPU/AgNW gradient films have EMI shielding and thermal management applications.
研究领域:
材料科学
·
可持续发展
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
SURFACE & COATINGS TECHNOLOGY
·
2025
·
IF 6.1
Pengxing Yu,Ruoyun Wang,Kai Wang,Huabing Liu,Biyou Peng,Hongjian Huang,Junwu Xiang,Haiyang Zhou,Tong Zhou
To enhance the long-term corrosion resistance of 3D-printed AlSi10Mg alloy, this work designed a two-step micro-arc oxidation (MAO) strategy. Given the difficulty of triggering micro-arc discharge in high-Si Al alloys, an intermediate transition layer was first prepared through one-step MAO in a silicate electrolyte. Subsequently, a two-step MAO treatment was performed in a phosphate electrolyte with the addition of K 2 ZrF 6 to seal the ablation holes formed during the one-step MAO process, achieving a self-sealing effect of the MAO coating. Ultimately, a dense ZrO 2 /Al 2 O 3 ceramic coating with Si-W-Zr-P gradient distribution was obtained on the AlSi10Mg surface after the two-step MAO. Electrochemical tests reveal that the two-step MAO coating exhibits exceptional corrosion resistance, with a remarkably low corrosion current density (I corr ) of 3.42 × 10 −9 A·cm −2 , along with a protective efficiency (η p ) of up to 99.8 %. Moreover, no obvious macroscopic corrosion signs are observed on the ZrO 2 /Al 2 O 3 coating after prolonged immersion, and its I corr remains stable at 9.26 × 10 −9 A·cm −2 , indicating durable protective performance. This study offers a novel and controllable strategy for the design of anti-corrosive coatings on 3D-printed high-Si Al alloys.
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Hai Sun,Tiandong Zhang,Chao Yin,Hongzhan Sun,Changhai Zhang,Yue Zhang,Yongquan Zhang,Chao Tang,Qingguo Chi
Film capacitors as one of the most important electronic devices are heading in large capacity, heightened integration and excellent extreme-condition tolerance, which faces the challenges in maintaining outstanding performance under harsh conditions of high temperature and large electric field. Nonetheless, polymer capacitive films, which are renowned for their exceptional thermal stability, experience an escalation in conduction losses at elevated temperatures, resulting in degradation of energy storage performance. This study presents the gradient distribution of organic fillers content in all-organic polymer capacitive films utilizing electrospinning technique, the significantly improved high-temperature energy storage performance has been achieved. Glucose (GLC), a weak polar molecule rich in hydroxyl groups, is blended with the most promising polyetherimide (PEI). Experimental and theoretical calculations confirm that the formed hydrogen bond between GLC and PEI acts as a trapping site for capturing carriers and suppressing conduction losses. Furthermore, the spatial distribution of organic fillers was designed on the basis of direct mixing. The results demonstrate that the gradient composite film introduces interlayer interfacial polarization, while the dielectric mismatch between adjacent layers increases the height of potential barriers for the charge carriers across the interfaces, thereby achieving a synergistic enhancement of dielectric response and insulation strength. The maximum discharge energy density of 6.52 J/cm 3 with an efficiency of 85.6 % has been achieved at 150℃ for the modified capacitive films. This work establishes a decoupling relationship between permittivity and electric breakdown strength, offering insights for the advancement of polymer films with outstanding energy storage capabilities in extreme environments.
研究领域:
材料科学
·
能源存储
·
电介质物理
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Quancai Zhang,Zhen Wang,Li’an Zhu,Yicong Ye,Fayuan Li,Jinyu Gong,Shuxin Bai
In this work, the gradient multicomponent carbide ceramic coatings were prepared in-situ on graphite matrix using the molten salt method, and their high temperature ablation resistance was investigated. Our results demonstrate the successful preparation of (HfTi)C, (HfTiZr)C, and (HfTiZr)C–TaC ceramic coatings with a gradient distribution on the graphite matrix by altering the types of raw materials. Thermodynamic calculations and analyses indicate that the smaller the Gibbs free energy gap between different carbides, the easier the solid solution multicomponent ceramic coating is formed. After 200 s of oxy-acetylene torch ablation, it was observed that the (HfTi)C, (HfTiZr)C, and (HfTiZr)C–TaC coatings effectively protected the graphite matrix with mass ablation rates of 6.47 mg s −1 , 0.61 mg s −1 , and 0.51 mg s −1 , respectively. The low mass loss of (HfTiZr)C and (HfTiZr)C–TaC coatings can be attributed to the synergistic protective effect of different oxides formed by oxidation of different elements.
研究领域:
材料科学
·
高温材料
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES B-BIOINTERFACES
·
2017
·
IF 3.887
Hua Wu,Jiaoyan Liu,Qing Fang,Bo Xiao,Ying Wan
Nerve conduits containing aligned fibrous fillers with gradiently distributed signal molecules are essential for long-gap nerve repair. This study was to develop an approach for establishing nerve growth factor (NGF) gradients onto the aligned chitosan-polylactide (CH-PLA) fibers. CH-PLA containing 37 wt% of PLA was spun into fibers using a wet-spinning technique. CH-PLA fibers showed much higher wet-state tensile strength, enhanced degradation tolerance and significantly lower swelling degree in comparison to chitosan fibers. The CH-PLA fibers with diameters from 40 to 60 μm were selected and segmentally coated in bundles using NGF-contained alginate solutions to establish NGF gradients lengthwise along fibers. The diameter of resulting NGF-loaded CH-PLA/alginate fibers was well controlled within a range between 60 and 120 μm. Calcium ion crosslinked alginate coating layers on fibers showed abilities to administer the sustainable NGF release in a gradient distribution manner for at least 5 weeks. NGF-induced neurite outgrowth of PC12 cells confirmed that bioactivity of NGF released from fibers was well retained.
研究领域:
生物医学工程
·
神经科学
✓ 已验证
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2025
·
IF 2.8
Bo Zhu,Wenliang Xu,Hao Sun,Bo Yang
Cross-linked polyethylene (XLPE) insulation materials produce water tree aging under the combined action of moisture and electric field for a long time, resulting in a decline in insulation performance and a serious threat to the safety of power system operation. In view of the above problems, a three-layer shell–core microcapsule with siloxane as a repair agent was designed in this article, and it was distributed in the XLPE matrix material in a gradient manner to realize the self-healing of the material to water tree aging. The results showed that the microcapsules had good morphology. When the doping concentration of the microcapsules is low (1.0 wt%), it can also have an excellent water tree aging repair effect on the basis of ensuring the original insulation performance of XLPE. The repair effect of microcapsules/XLPE composites with gradient distribution is better than that of microcapsules/XLPE composites with uniform distribution, which solves the problem of low repair efficiency of uniform distribution and has a good research prospect in practical application.
研究领域:
材料科学
·
聚合物复合材料
·
电气绝缘
·
自修复材料
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Yinwei Fu,Xiaofeng Lei,Huiming Yin,Xizheng Liu
Flexible lithium–air batteries (LABs) with a redox mediator (RM) in the electrolyte demonstrate enhanced round-trip efficiency. However, their cycle performance is unsatisfactory due to severe corrosion of the Li metal anode. Herein, we propose a two step gelatinization strategy to fabricate a gradient RMs (including LiI, TMPD, and DMPZ) gel electrolyte, in which the bare electrolyte gelatinization on the Li surface and then the electrolyte contained RMs sequentially gelled on the formed gel. The RMs mainly distributed at the surface and anchored at the cathode side. By suppressing the shuttle of RMs in the electrolyte and alleviating the passivation of the Li anode, the mid-charging potentials can reach 3.44 and 4.08 V at the 15th cycle with and without the LiI mediator, respectively. The energy efficiency is 63% even at the 150th cycle, whereas the corresponding energy efficiency are only 47% and 51% for the LABs with liquid and normal gel electrolytes, respectively. Moreover, the cycle life of the battery containing the gradient gel electrolyte is three times longer than that with the liquid electrolyte. The gel electrolyte further offers the flexibility of the device, and the laminated cells thus fabricated can readily operate under harsh bending conditions.
研究领域:
电化学
·
能源材料
·
纳米材料
·
界面化学
·
储能技术
·
先进电池
·
功能高分子
·
柔性电子
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）