JOURNAL OF MEMBRANE SCIENCE
·
2016
·
IF 5.557
Jonas Hereijgers,Heidi Ottevaere,Tom Breugelmans,Wim De Malsche
In this work, the impact of the spacer features (interpillar distance and shape) on the membrane deflection, pressure difference across the membrane, and mass transfer was studied for a flat membrane microcontactor. It was demonstrated that decreasing the interpillar distance between the circular pillars reduced membrane deflection considerably. As a consequence, also the pressure difference across the membrane decreased, which lowers the possibility of breakthrough occurring. However, this was only the case until an interpillar distance of 836 µm was reached. Decreasing the interpillar distance further, the pressure difference across the membrane again increased. This was due to the smaller gap between the pillars, resulting in a higher hydraulic resistance. However, it was demonstrated that with the use of a channel filled with radially elongated (diamond shaped) pillars and wedges the pressure difference across the membrane remained minimal at small interpillar distances (i.e. 305 µm). Finally, the effect of the membrane deflection on the mass transfer was studied. It was shown that membrane deflection can have either a positive or negative impact on the mass transfer and solvent inside the pores instead of the feed is not always beneficial when membrane deflection is taken into account. Therefore, design rules for the spacer geometry are deduced, which allows maximizing mass transport.
研究领域:
生物工程
·
化学工程
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Kai Zhang,Yinjie Sun,Yiling Cheng,Sifan Hou,Jinpeng Fan
Inspired by the Bouligand structure in nature, a kind of Inverse-Bouligand structure was designed. Different from the bionic Bouligand structure of a one-dimensional material unit, the inverse-Bouligand structure is obtained by stacking and twisting the ceramic layer with a parallel groove structure. The grooves arranged in parallel are first etched on the ceramic green body and then sintered after stacking and twisting. After sintering, the groove structure can still be maintained, so the resulting laminated twisted groove structure in the bulk forms an inverse-Bouligand structure, which can promote crack deflection and improve the toughness of the material during the fracture process. After testing different twist angles, the results show that when the twist angle is 15°, the toughness of the material can reach 11.22 ± 1.77 MPa m 1/2 , and high strength can be guaranteed. The synergistic effect of interlayer crack deflection and regional crack twist is the main mechanism for the improvement of material toughness.
研究领域:
材料科学
·
陶瓷工程
·
仿生学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2018
·
IF 3.794
Yehong Cheng,Ping Hu,Shanbao Zhou,Xinghong Zhang,Wenbo Han
Graphene is one of the important candidates in ceramic toughening due to its outstanding physical and chemical properties. For the weak interface toughening of large-diameter graphene sheet and alleviation of the interfacial reaction between ceramic precursors and graphene sheets during high-temperature pyrolysis, ZrC–SiC‒Graphene composite was synthesized via a facile technology of infiltrating ceramic slurry instead of ceramic precursor into macroporous graphene network and spark plasma sintering . The incorporation of the graphene network improved fracture toughness, critical crack size, and fracture energy of ZrC–SiC ceramic. The multiple length-scale toughening mechanisms of ZrC–SiC‒Graphene composite include the macroscopic toughening mechanism of crack deflection and bifurcation and the micro toughening mechanism of graphene bridging, ceramic micro zone tearing, graphene pull-out, graphene and ceramic brick slipping.
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
Journal of Asian Ceramic Societies
·
2025
·
IF 2.1
Maohui Li,Mingjun Zhang,Bo Ma,Wenzhou Sun,Yanmin Wang,And Youjun Lu
While graphene is widely acknowledged for its potential in enhancing the toughness of ceramic composites, achieving substantial mechanical improvements through simple and scalable processing methods remains a challenge. This study demonstrates that minimal additions of graphene nanoplatelets (GNPs) can significantly enhance the fracture toughness of silicon carbide (SiC) ceramics using pressureless sintering. The investigation focused on examining the influence of GNPs addition on the phase composition, porosity, mechanical properties, and microstructure of these composite ceramic materials. By incorporating only 1–3 wt.% GNPs into an α-SiC matrix, a remarkable 37.86% increase in fracture toughness (5.28 MPa·m1/2) is achieved at the optimal loading of 1 wt.%, surpassing the toughening efficiency typically reported for similar composite systems. Microstructural analysis revealed that the primary toughening mechanisms of GNPs in SiC involve pull-out and crack deflection. This study demonstrates GNPs combined with pressureless sintering can effectively unlock the toughness potential of SiC ceramics, providing a practical and scalable approach for industrial applications.
研究领域:
材料科学
·
陶瓷
·
纳米复合材料
·
机械工程
✓ 已验证
产品关联
DOI
高影响因子
RAPID COMMUNICATIONS IN MASS SPECTROMETRY
·
2025
·Vol. 39
·期 20
·e10103
·
IF 1.7
Mengfei Shan,La Chen,Jun Wang,Luhong Wen
Rationale In electrospray ionization mass spectrometry (ESI-MS) systems, two critical challenges persist: (1) under-expanded supersonic jets at the atmospheric pressure interface (API) cause ion losses and reduced transmission efficiency; (2) residual solvents and charged droplets entering vacuum stages lead to contamination and elevated chemical noise, degrading analysis accuracy. Methods A dual-channel off-axis ion funnel with a deflection electrode (DC-OFIDE) was developed to address these challenges. This device integrates three core components: an ion drift channel (IDC), an ion funnel channel (IFC), and a deflection electrode. The IDC and IFC are separated by conjoined gaps. Ions within the gas stream emanating from the API are extracted from the IDC via a deflection field, while a retarding axial field prolongs ions' residence time, ensuring efficient transfer to the IFC. This DC-OFIDE features an enlarged entrance aperture (Φ18 mm) to accommodate a multi-capillary interface, enhancing compatibility with high-conductance sample introduction systems. Results Compared with the original conventional ion funnel (CIF), the DC-OFIDE achieved a threefold enhancement in caffeine ion intensity and a broader m/z transmission window. It demonstrated robust neutral and droplet suppression, maintaining 80% ion intensity even under tripled serum volume infused. In drug screening of hair samples, baseline noises in drug ion peaks were reduced by 36%–82%, with a quadrupled signal-to-noise ratio improvement observed for 6-monoacetylmorphine. Conclusions This DC-OFIDE significantly enhances ion transmission efficiency and chemical noise suppression in ESI-MS, establishing its potential for high-fidelity analysis of complex samples.
研究领域:
质谱分析
·
分析化学
·
离子光学
·
生物医学分析
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药物筛选
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Advanced Composites and Hybrid Materials
·
2025
·Vol. 8
·期 4
·1-15
·
IF 21.8
Zhang Yunxiao,Zhao Hongchen,Ou Yunfu,Zhang Han,Yao Xudan,Mao Dongsheng
The strategy of interlaminar toughening shows tremendous potential in addressing delamination failure in glass fiber-reinforced polymer (GFRP) composites. In contrast to commonly used particulate or nanofibrous interleaves, mesh structures feature a more continuous and uniform architecture, which confers notable benefits in terms of scalability. Despite this potential, there is currently a lack of systematic studies on the role of mesh structures in interlaminar toughening. Therefore, this study investigates the interlaminar toughening behavior of polyamide (PA) mesh, known for its excellent mechanical properties, as an interlayer in GFRP, focusing on the effects of different mesh densities and thicknesses. Through different fracture tests and failure analyses, the correlation between mode I/II fracture behaviors and characteristic parameters of PA6 mesh was elucidated. The results indicate that by introducing the PA6 mesh, the mode I and mode II fracture toughness can be improved by 109% and 69%, respectively. This enhancement is attributed to the structural toughening effect of the PA mesh, including PA fiber bridging, plastic deformation, and fracture, as well as its ability to induce controlled crack deflection and guidance. Upon analysis, the primary factor influencing the toughening efficiency of the PA mesh is the mesh porosity. Only within an appropriate porosity range (20% ~ 60%) can the interlaminar toughening effect of the PA mesh be activated. Under this premise, thickness, as the secondary dominant factor, has a positive regulatory effect on the interlaminar fracture toughness of the PA intercalated laminates.
研究领域:
材料科学
·
复合材料
·
机械工程
·
高分子科学
·
断裂力学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2024
·
IF 5.8
Boren Ke,Ji Zou,Weimin Wang,Wei Ji,Zhengyi Fu
ZrC-SiC-ZrB 2 ceramics were prepared via ultra-high pressure sintering under 15 GPa at 1200 °C. The densification mechanism, microstructures, and properties of the prepared ceramics were investigated. The sintered ceramics with ZrB 2 content of 15 vol % showed the improved comprehensive mechanical properties, including Vickers hardness of 26.6 GPa, Young's modulus of 469.1 GPa, and fracture toughness of 5.0 MPa·m 1/2 , which was 86.7 % higher than that of pure ZrC ceramics. In the sintered sample, the ultra-high pressure induced new microstructure, such as L-C lock in ZrC phase, stacking faults and nanotwins in SiC phase, and severe lattice distortion in ZrB 2 phase, jointly contributed to the improvement in Vickers hardness. Deflection and bridging during crack propagation were ascribed to the uniform combination of various phases.
研究领域:
材料科学
·
陶瓷工程
·
力学性能
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Tongyuan Meng,Zeen Wang,Gui Wang,Bo Li,Ying Xu,Haiying Zhao,Xinhui Gao,Zhaoxin Zhong,Zhanhong Chen,Yang Wang,Yushi Qi,Futian Liu
Bidirectional freeze casting combined with pressure infiltration has demonstrated significant potential as an effective approach for fabricating bioinspired lamellar composites with excellent strength and toughness. However, their dynamic mechanical response remains underexplored. In this study, B 4 C/2024Al composites with long-range ordered nacre-like architectures were fabricated using bidirectional freeze casting followed by pressure infiltration. The mechanical properties and deformation behavior under both quasi-static and dynamic compression conditions were systematically investigated. The results reveal that dynamic compressive strength and strain were significantly higher than their quasi-static counterparts, largely attributed to strain rate hardening and localized matrix melting. Compared to unidirectionally structured composites, the bidirectionally structured ones exhibited superior mechanical performance, achieving a maximum compressive strength of 1088.6 MPa at a strain rate of 3000 s −1 (40 vol% B 4 C/2024Al composite). A clear dependence of flow stress and energy absorption capability on B 4 C volume fraction was observed. As B 4 C content increased, the compressive strength rose, but dynamic strain energy density showed a decreasing trend beyond 20 vol% due to reduced ductility. Specifically, the energy density peaked at 133.08 MJ/m 3 for the 20 vol% composite and declined with further ceramic addition, indicating a trade-off between strength and impact energy absorption. The enhanced toughness under dynamic loading is primarily attributed to adiabatic shear localization in the aluminum matrix, which facilitates localized softening and strain accommodation. Additional contributions include crack deflection and branching within the hard ceramic layers, as well as plastic deformation and thermal softening-induced toughening mechanisms in the metallic phase. These findings highlight the promise of nacre-inspired B 4 C/Al composites for advanced lightweight armor systems, offering an optimized balance between strength, toughness, and energy absorption under high-strain-rate loading.
研究领域:
材料科学
·
机械工程
·
复合材料
·
仿生材料
·
动态力学行为
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2023
·
IF 5.7
Li Wang,Ke Wang,Yao Ma,Yong Ma,Sen Shi,Hongdi Tan,Xibei Jia,Xiangyang Li,Lanjie Niu,Bingheng Lu
Luneburg lenses prepared by alumina stereolithography , have the advantages of low dielectric loss, corrosion resistance , and flexible structure. However, the supporting structure limits the degree of geometric design freedom. This paper analyzes the effects of modifiers and dispersants on paste properties from the molecular structure, which is different from the traditional process that doesn’t analyze the influence of similar mechanisms and binding site competition while ignoring the correlation. Based on the dispersant’s better flexibility bringing more obvious change in viscosity, we first determine the amount of dispersant and then adapt the amount of modifier to obtain self-supporting pastes of 82 wt % and 24.9 Pa.swithout gradation. The gain and beam deflection angle of Luneburg lenses with high geometric complexity and working bandwidth of 38° formed by stereolithography self-supporting process is matched to the simulation results without manufacturing defects, which provides a theoretical basis for more flexible design and manufacture of Luneburg lenses.
研究领域:
材料科学
·
增材制造
·
电磁学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2018
·
IF 3.057
Yehong Cheng,Yang Lyu,Shanbao Zhou,Wenbo Han
Although axially aligned fibrous monolithic ceramics have superior mechanical properties in ceramic fiber axial direction, the obvious anisotropy in physical and chemical properties of fibrous monolithic ceramics predetermine the significant on-axis and off-axis discrepancy. The existing ZrB 2 -based fibrous monolithic ceramics were all arranged by axially aligned ceramic fibers. Non-axially aligned ZrB 2 -SiC/ZrB 2 -SiC-graphene short fibrous monolithic ceramics with isotropic in-plane properties were fabricated by hot pressing of disorderly-arranged short ZrB 2 -SiC/ZrB 2 -SiC-graphene fibers to overcome in-plane anisotropy of the ZrB 2 -based fibrous monolithic ceramics. ZrB 2 -SiC/ZrB 2 -SiC-graphene short fibrous monolithic ceramics have remarkable increase in fracture toughness, critical crack size and work of fracture compared with ZrB 2 -SiC ceramics. The toughening mechanism of ZrB 2 -SiC/ZrB 2 -SiC-graphene short fibrous monolithic ceramics include macroscopic toughening of crack deflection, crack branching, interface friction and ZrB 2 -SiC cell extraction, and microscopic toughening of graphene bridging and pull-out.
研究领域:
材料科学
·
陶瓷
·
复合材料
·
力学性能
✓ 已验证
产品关联
DOI
高影响因子
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2025
·
IF 8.9
Yi Xue,Zhuang Huang,Zehao Yang,Jiamei Luo,Yong Liu,Minqiang Jiang,Hui Zhang,Jianyong Yu
In this study, through a targeted experimental approach, polyethersulfone/carbon nanotubes (PES/CNTs) films with variable carbon nanotubes (CNTs) contents were fabricated by the phase inversion approach and employed in carbon fiber/epoxy (CF/EP) composites prepared by the vacuum-assisted resin infusion process to upgrade the toughness of composites. The dissolution of the PES/CNTs films in the epoxy resin was revealed to be controllable, which guaranteed a gradient distribution of polyethersulfone and CNTs between the layers. As observed, the CF/EP composites with PES/CNTs films containing 0.5 phr CNTs provided the optimized mode I fracture toughness with a 120.4% increase in G IC compared to the reference. Whereas, the G IIC of the composites with PES/CNTs film containing 1.0 phr CNTs was increased by 92.5%. Additionally, observation of the fracture surfaces of mode I and mode II specimens by scanning electron microscopy revealed that PES/CNTs films toughened CF/EP composites via three mechanisms: i) crack deflection and secondary microcracks initiation caused by polyethersulfone microspheres, ii) cracks bridging effect and pull-out from the epoxy matrix of CNTs and iii) CNTs distributed between epoxy matrix and polyethersulfone microsphere led to more energy consumption, which had a synergistic effect. This method overcomes the trade-off between toughness and stiffness in traditional interleaving methods, providing a new approach for the manufacturing of high-performance CF/EP composites.
研究领域:
材料科学
·
聚合物复合材料
·
纳米技术
·
机械工程
✓ 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）