Materials Today
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2022
·
IF 26.943
Lei Li,Chao Jia,Ying Liu,Ben Fang,Wenqing Zhu,Xiaoyan Li,Laura–Alena Schaefer,Ziwei Li,Fangshu Zhang,Xuning Feng,Naveed Hussain,Xiaoqin Xi,Dong Wang,Yuan–Hua Lin,Xiaoding Wei,Hui Wu
Ceramics are considered intrinsically brittle at room temperature , which is mainly attributed to the limited availability of crystallographic slips and pre-existing geometrical flaws. Moreover, the lack of flexibility has severely hindered many high-end applications of ceramic materials. Here, we produce ceramic sponges that are simultaneously ultra-light, elasto-flexible, thermally insulating, and can fully recover from large deformation with a near-zero Poisson's ratio . These spongy materials also possess superb fatigue resistance without the accumulation of damage or structural collapse for 10,000 large-scale compressive or buckling cycles. We demonstrate the exceptional flexibility is enabled by the elastic distortion of nanograin–glassy dual phase and the fiber bulking in open-cell three-dimensional structure. Moreover, these spongy materials possess superior temperature-invariant superelasticity from deep cryogenic temperatures (−196 °C) to high temperature (1500 °C). Our study not only developed mechanically reliable lightweight ceramics for numerous extreme applications, but also provided new theoretical insights into the origin of flexibility in polycrystalline ceramics.
研究领域:
材料科学
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机械工程
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陶瓷
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纳米材料
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先进材料
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DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
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2023
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IF 19
Yi Wu,Ying Han,Zhuxuan Wei,Yu Xie,Jun Yin,Jin Qian
The rational design of mechanical metamaterials endows them with unusual properties inaccessible by conventional materials. In this study, compression–twist coupling building blocks with embedded chirality are fabricated by multimaterial 4D printing of shape memory polymers. Each chiral unit can be programmed individually by mechanical compression at a selected high temperature, whose temporary shape is self-maintained at the reduced temperature when the load is removed. With these building blocks, lattice-like architectures can be constructed in planar and layer-to-layer assemblies. Such modular design overcomes the limitation of conventional material arrangement by allowing on-demand re-programmability of chirality-defined structural heterogeneity. Using this strategy, metamaterials with tunable Poisson's ratio and shape-morphing metastructures are developed by harnessing the cooperative deformation of spatially heterogenous tessellation that undergoes local shrinkage or expansion, depending on the encoded Poisson response. An untethered multimodal soft gripper is assembled by chiral metastructures with distinct morphing modes, capable of unscrewing up a bottle cap attributed by the programmed functionality at module-level. The present modular chiral metamaterials with embedded chirality and flexible deployability may promote the applications of mechanical metamaterials in active shape-morphing structures and functional soft machines.
研究领域:
材料科学
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机械工程
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增材制造
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智能材料
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产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2020
·Vol. 8
·期 28
·14243-14253
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IF 11.301
Qingqing Cheng,Yang Liu,Jing Lyu,Qiang Lu,Xuetong Zhang,Wenhui Song
Auxetic architectures with a negative Poisson's ratio have attracted increasing attention due to their intriguing physical properties and numerous promising applications and recent advancements in manufacturing techniques. However, fabrication of three-dimensional (3D) polymeric auxetic architectures with a tailored hierarchically porous structure and desired physical/mechanical properties remains challenging. Herein, 3D nanofibrous Kevlar aerogel architectures with porosity at multiple scales have been designed and fabricated through a new additive manufacturing strategy, i.e., integration of direct ink writing and freeze-casting with non-toxic solvent-based inks followed by special drying techniques. The highly porous 3D nanofibrous Kevlar aerogel architectures achieve excellent mechanical properties with an ultralow density (down to 11.9 mg cm−3) and large specific surface area (up to 350 m2 g−1). The Poisson's ratio is tunable in a wide range, spanning from −0.8 to 0.4, by adjusting the spatial arrangement of the designed pattern struts. Finally, these nanofibrous Kevlar aerogel architectures have been further functionalized into hydrophobic, luminescent and thermoresponsive architectures by using fluorocarbon resin, functional dyes and organic phase-change materials respectively. The multi-functional auxetic aerogel architectures demonstrate potential for a broad range of applications.
研究领域:
材料科学
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纳米技术
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增材制造
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机械工程
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2025
·
IF 19
Hao Yin,Yanting Li,Chenhui Jiang,Qichao Li,Yiping Guo
Multimodal sensing in thermomechanically coupled environments, such as lithium–ion battery monitoring, remains constrained by inter-modal interference and low sensitivity to environmental changes. This work presents a decoupling strategy using a modulus-heterogeneous “rotating square” auxetic structure to vertically separate a thermoresistive temperature sensor array from a piezoelectric strain sensor array. This design near-perfectly eliminates thermo-mechanical crosstalk, enabling simultaneous detection of subtle thermal and mechanical variations over a wide temperature range. Specifically, the rigid regions of the auxetic structure rotate under tensile strain to isolate the temperature sensors from deformation, while the stretchable regions expand laterally to enhance in-plane strain in the potassium sodium niobate (KNN)-based piezoelectric layer, compensating for its intrinsically low d 31 coefficient. Benefiting from this architecture, the thermoresistive sensor provides stable, independent responses from 25 to 130 °C with 0.1 °C resolution. Simultaneously, the first developed piezoelectric unit, based on a lead-free KNN ceramic framework, achieves 100% stretchability and reliably detects surface protrusions as small as 5 µm without thermal interference. When deployed on a pouch-cell battery, the sensor array reliably detects both overheating and swelling, offering a compact and robust dual-parameter sensing solution with strong potential for structural health monitoring in complex environments.
研究领域:
传感器与传感技术
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材料科学
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柔性电子学
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储能系统
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结构健康监测
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产品关联
DOI
高影响因子
Nature Communications
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2020
·Vol. 11
·期 1
·1-13
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IF 12.121
Jia Chao,Li Lei,Liu Ying,Fang Ben,Ding He,Song Jianan,Liu Yibo,Xiang Kejia,Lin Sen,Li Ziwei,Si Wenjie,Li Bo,Sheng Xing,Wang Dongze,Wei Xiaoding,Wu Hui
Advanced ceramic sponge materials with temperature-invariant high compressibility are urgently needed as thermal insulators, energy absorbers, catalyst carriers, and high temperature air filters. However, the application of ceramic sponge materials is severely limited due to their complex preparation process. Here, we present a facile method for large-scale fabrication of highly compressible, temperature resistant SiO 2 -Al 2 O 3 composite ceramic sponges by blow spinning and subsequent calcination. We successfully produce anisotropic lamellar ceramic sponges with numerous stacked microfiber layers and density as low as 10 mg cm −3 . The anisotropic lamellar ceramic sponges exhibit high compression fatigue resistance, strain-independent zero Poisson’s ratio, robust fire resistance, temperature-invariant compression resilience from −196 to 1000 °C, and excellent thermal insulation with a thermal conductivity as low as 0.034 W m −1 K −1 . In addition, the lamellar structure also endows the ceramic sponges with excellent sound absorption properties, representing a promising alternative to existing thermal insulation and acoustic absorption materials.
研究领域:
材料科学
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陶瓷工程
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热绝缘
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声吸收
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产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2021
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IF 9.229
Zhenwei Wang,Congcong Luan,Guangxin Liao,Jiapeng Liu,Xinhua Yao,Jianzhong Fu
High-performance stretchable strain sensors, particularly those with high sensitivity and broad sensing range, are highly important for wearable devices. Herein, a novel auxetic bilayer conductive mesh strain sensor (ABSS), composed of multi-hardness silicones, is proposed and fabricated by the direct ink writing 3D printing and ink spraying technique. The bilayer conductive mesh comprises a thin layer of high-conductive and crack-prone single-walled carbon nanotubes (SWCNTs) coated on a stretchable carbon-black-doped Ecoflex silicone rubber (CB/Ecoflex) mesh. The former serves as the dominant sensing material by generating SWCNT cracks in the full strain range, while the latter mainly plays the roles of both generating the resistance change and maintaining the conductive paths under high strain conditions. The presence of high-hardness auxetic frame contributes to the formation of longitudinal SWCNT cracks on transverse meshes, enhancing the sensitivity of the sensors. It is shown that the synergistic effect of the bilayer conductive mesh, strain concentration, and auxetic deformation strategy endow ABSS with a high gauge factor (∼ 13.4) that is 6.6 times larger than that of the common sensor. Additionally, this study demonstrates the superior sensing performance of the ABSS for wearable applications including swallowing recognition, respiration monitoring, and joint movement detection.
研究领域:
材料科学
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机械工程
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电子学
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可穿戴技术
✓ 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）