ACTA MATERIALIA
·
2024
·
IF 8.3
Qinghu Guo,Xiangyu Meng,Dongxu Li,Zhonghua Yao,Huajun Sun,Hua Hao,Hanxing Liu,Shujun Zhang
Electrostrictive materials play an important role in the development of high precision actuators, due to the advantages of high resolution, low power dissipation and fast response time. However, the practical application of electrostrictive materials has been hindered by their limited displacement output. To address this, we conducted a study where we doped Pb(Mg 1/3 Nb 2/3 )O 3 -PbTiO 3 (PMN-PT) ceramics with Nd 2 O 3 , aiming to significantly improve the electrostrictive effect by enhancing local structural heterogeneities that disrupt the formation of long-range ordered ferroelectric domains. We obtained an optimized electrostrictive strain of 0.231 % with negligible hysteresis at an electric field of 50 kV/cm in 4 %Nd-doped PMN-PT ceramic, surpassing the performance of state-of-the-art lead-based electrostrictive ceramics. Of particular significance is that a high electrostrictive coefficients M 33 = 12.2 × 10 −16 m 2 /V 2 , together with a high mechanical work density of 0.035 J/cm 3 and a low power dissipation of 14 %, was achieved under a mechanical prestress of 50 MPa and an electric field of 10 kV/cm. Additionally, this material exhibits excellent fatigue resistance , with less than 3 % variation over 10 6 operation cycles. All these findings position 4 %Nd-doped PMN-PT ceramics as a promising candidate for high-performance electromechanical actuator applications.
研究领域:
材料科学
·
工程学
✓ 已验证
DOI
高影响因子
Journal of Traffic and Transportation Engineering-English Edition
·
2022
·
IF 0
Gang Zhang,Xiaocui Zhao,Zelei Lu,Chaojie Song,Xuyang Li,Chenhao Tang
This paper presents an overview on fire behavior of bridge girders mainly including prestressed concrete (PC) bridge girders and steel bridge girders. The typical fire accidents occurred on bridges are illustrated and, the seriousness of posing threats to bridge structures resulted from increasing traffic fires, specially intense hydrocarbon fires generated from petrol-chemicals, is highlighted. The current researches, embracing high-temperature properties of constituent materials, prestress state, measurement in fire tests, numerical methods, structural fire resistance, and so forth, taken on coping with problems existing in fire behavior and structural fire behavior in bridge girders are reviewed and discussed. Further, strategies for enhancing fire resistance of bridge girders followed with failure criterion and mode in types of bridge structures are provided. Future research area along with emerging trends in structural fire behavior of bridge girders is also recommended for mitigating fire hazards occurred on bridge girders. Herein, it can be attained a conclusion from review and discussion that prestressed concrete bridge girders with thin webs, specially T-shaped bridge girder, are prone to unstable under fire exposure conditions. High-strength concrete utilized in prestressed concrete bridge girders is vulnerable to spalling at elevated temperature. Steel-truss bridge girder present a more significant fragility to fire exposure compared than other steel bridge girders.
研究领域:
土木工程
·
结构工程
·
材料科学
✓ 已验证
DOI
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2023
·
IF 8.7
Chenglong Zhu,Quan Wang,Yinbo Zhu,Yin Liu,Jingjiang Wei,Hang Ping,Kun Wang,Zhaoyong Zou,Jingjing Xie,Hao Xie,Hao Wang,Weimin Wang,Zhengyi Fu
Prestressing strategies are widely adopted in the formation of biological structures to modify their mechanical property. Inspired from the prestress generation during the formation of biominerals , a nacre-inspired boron nitride (BN) nanosheets strengthened by prestressed sodium alginate (SA) matrix is fabricated. The BN/SA (BS) films are formed by freeze-casting and pressing, then immerse in ethanol (BS-E) or CaCl 2 solution (BS-Ca). Several megapascals contractile stress is generated in film that is attributed to the contraction and crosslink of SA chains. Subsequently, artificial bulk composites are fabricated by stacking of these prestressed films via hot-pressing. Benefit from the contractile stress, the orientations of BN nanosheets in BS-E and BS-Ca are improved, and the (0 0 2) interplanar spacing of BN nanosheets in BS-Ca bulk is slight expansion compared with BS. Finally, the flexural strength of BS-E bulk is enhanced from 145 MPa (BS) to 174 MPa when the loading direction is parallel to stacking.
研究领域:
材料科学
·
仿生学
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED MATERIALS
·
2025
·
IF 26.8
Changyuan Guo,Qing He,Fang Liu,Jiashen Meng,Jinsong Wu,Kang Han,Xuanpeng Wang,Liqiang Mai
Niobium tungsten oxide offers rapid ionic transport and high safety in fast-charging lithium-ion batteries, but suffers from challenges of large structure stresses and low capacity retention at rates exceeding 20C. Here, a novel lattice-prestressed Nb 14 W 3 O 44 (LP-NWO) is reported that overcomes its intrinsic structural limitations, enabling near-zero volume change and ultrafast lithium storage. The lattice-prestressed structure involves the alternating distribution of 4 × 4×∞ and 4 × 3×∞ rectangle units, along with octahedra distortion, which leads to the formation of specific and ordered lattice prestresses. The rectangle units induce tensile stresses, while the octahedra distortion results in compressive stresses. This prestressed structure not only preserves continuous diffusion channels but also enhances both ion and electron conductivity. Importantly, the presence of prestress greatly relieves the strain generated during lithium insertion and extraction. This can be observed through a reversible curve-to-straight evolution of lattice fringes, resulting in near-zero volume change during cycling. The LP-NWO delivers a 78% capacity retention at 100C after 20 000 cycles and more than 2 000 cycles of full cells at 50C, as well as no safety risk under severe stress conditions. This prestressed strategy offers implications for the development of zero-strain electrodes, aiming to overcome fast-charge limitations through internal means.
研究领域:
材料科学
·
电化学
·
能源存储
·
无机化学
·
固态离子学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2025
·
IF 19
Chenglong Zhu,Quan Wang,Jiahao Li,Yinbo Zhu,Rongguang Che,Yidi Li,Jingjiang Wei,Siqian Lu,Hao Xie,Hao Wang,Weimin Wang,Hang Ping,Kun Wang,Zhengyi Fu
As a laminated composite, the robust interface between aragonite platelets and organic matrices imparts nacre with superior mechanical properties. Additionally, the prestressing strategy, which involves compressing hydroxyapatite platelets through the contraction of collagen molecules, is employed to enhance bone strength. Inspired by these natural materials, layered brushite/sodium alginate composite bulks (BSPE) are fabricated with high performance through synergistic interfacial interactions and prestress processing. The bulks are prepared by stacking and hot-pressing BSPE films, which are obtained via unidirectional freeze-casting and pressing. To strengthen the interfacial interactions, brushite platelets are surface-modified with polyvinyl alcohol molecules, forming strong hydrogen bonds with sodium alginate chains. Furthermore, megapascal-level contractile prestresses are generated by soaking surface-modified films in ethanol, inducing the shrinkage of sodium alginate chains through dehydration. Consequently, the specific strength and specific toughness of the composites reach 137.5 MPa/(Mg m −3 ) and 3.8 MPa m 1/2 /(Mg m −3 ), respectively, representing 2.0 and 2.5 times the values of natural nacre. Moreover, the energy absorption capacity of the BSPE bulk is approximately 2.5 times higher than that of the control bulk. The synergistic approach provides new insights for designing and manufacturing high-performance composites under mild conditions.
研究领域:
材料科学
·
复合材料
·
仿生材料
·
力学性能
·
高分子科学
✓ 已验证
产品关联
DOI
高影响因子
Nature Communications
·
2025
·Vol. 16
·期 1
·1-12
·
IF 15.7
Wang Hongxing,Cheng Longdi,Yu Jianyong,Si Yang
Ceramic aerogels, widely used as thermal insulation materials, are renowned for their remarkable characteristics, including ultralight weight and ultralow thermal conductivity. However, their application is often limited by susceptibility to damage under repeated dynamic thermal shocks—a challenge that remains inadequately addressed. Herein, we present a multicomponent structural engineering approach that integrates ceramic nanofibers with traditional textile knitting topology to fabricate mechanically adaptable ceramic fibrous aerogels. Benefiting from the porous nanofibrous network and the synchronized motion of the prestressed knitted topological framework, which can be readily activated to accommodate deformation while efficiently dissipating energy, the resulting aerogels exhibit exceptional mechanical properties. Specifically, our aerogels demonstrate a high tensile strength of 356.6 kPa, a compressive strength of 109.1 kPa, and remarkable mechanical adaptability in response to external stimuli. Moreover, these aerogels achieve a high fracture energy of 117.26 kJ m -3 and display exceptional recovery from deformation after 1000 cycles of compression or 500 cycles of tension. This study elucidates the structural-property interdependence in aerogel materials through multiscale analysis and advances the rational design of the next-generation impact-absorbing systems and metamaterials.
研究领域:
材料科学
·
纳米科技
·
复合材料工程
·
功能材料
·
力学性能调控
·
先进制造
·
热防护系统
✓ 已验证
产品关联
DOI
PubMed
高影响因子
NATURE MATERIALS
·
2025
·Vol. 24
·期 9
·1375-1386
·
IF 38.5
Zhang Teng,Chen Youxin,He Zhiyan,Liu Qinran,Chen Le,Wang Kai,Chen Wenzhe,Wang Kunchan,Ye Xiaowo,He Zhuoyang,Zhang Yuyang,Zhang Yanming,Liao Chenghao,He Yuan,Gao Wenpei,Zhang Tianyu,Hu Bei,Jiang Shenghao,Shi Fangyuan,Gao Shengguang,Li Xinyue,Chen Changxin
Black phosphorus nanoribbons (BPNRs) with a tunable bandgap and intriguing electronic and optical properties hold strong potential for logic applications. However, efficiently producing high-quality BPNRs with precise control over their size and structure remains a great challenge. Here we achieved high-quality, narrow and clean BPNRs with nearly atomically smooth edges and well-defined edge orientation at high yield (up to ~95%) through the sonochemical exfoliation of the synthesized bulk BP crystals with a slightly enlarged lattice parameter along the armchair direction. The resulting BPNRs have widths centred at 32 nm and can be as narrow as 1.5 nm, with edges consistently aligned along the zigzag direction in measured BPNRs with widths ≤340 nm. The formation of one-dimensional BPNRs with zigzag edges is attributed to the introduction of pre-stress along the armchair direction of the grown bulk BP and the application of suitable sonication conditions. The BPNR bandgap increases as the BPNR width decreases from 83 nm to 13 nm, with a large bandgap of 0.64 eV for a 13-nm-wide BPNR. A typical graphene-contacted field-effect transistor fabricated with a 13-nm-wide and 10-nm-thick BPNR can achieve an on/off ratio of 1.7 × 10 6 , mobility of 1,506 cm 2 V −1 s −1 and on-state channel conductivity of 1,845 µS. The devices also exhibit excellent photodetection performance. Our method opens up a route to produce BPNRs with high material quality and defined edge chirality for fundamental studies and practical applications in electronic and optoelectronic fields.
研究领域:
材料科学
·
纳米技术
·
半导体物理
·
电子器件
·
光电子学
✓ 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）