Journal of Materials Chemistry C
·
2022
·Vol. 10
·期 23
·8931-8937
·
IF 8.067
Mingxia Liu,Zhao Xu,Yimei Lv,Shu Zhu,Weiping Liu,Lili Yang,Dengteng Ge
Owing to the remote activation, spatiotemporal control and local response, photo-driven actuators have attracted great attention in diverse potential applications. However, actuators always suffer from weak deformation force or low-efficiency deformation. Inspired by natural gradient functional materials, a gradient design of a photothermal component is developed to achieve a high-efficiency actuator with great photoinduced force. Based on theoretical calculations of silver nanowires (AgNWs) in poly(ethylene-co-vinyl acetate) (EVA) elastomers, a uniform temperature distribution is achieved under irradiation. The high efficiency of this actuator with a recovery rate of ∼97% is attributed to the very little thermal stress. This inspired gradient strategy can be a versatile and effective route to the design of light-driven smart materials for broader applications with higher efficiency and better durability.
研究领域:
材料科学
·
仿生学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2025
·
IF 19
Xinyu Li,Haoyue Zhao,Xunlong Zhang,Can Ge,Zhan Qu,Ning Qi,Zhe Sun,Yong Du,Jian Fang
Flexible Zn-ion batteries (ZIBs) have been regarded as a promising energy storage solution for flexible electronics. However, the challenges of dendrite growth due to uneven current density distribution and limited anode flexibility have impeded their practical application. Herein, a flexible 3D zinc anode with a dual gradient in porosity and conductivity is presented. This dual-gradient nanofibrous anode exhibits exceptional flexibility and durability, showing less than a 10% change in resistance after 15 000 bending cycles. The vertical gradient distribution in conductivity promotes preferential zinc deposition at the bottom section, while the gradient in porosity facilitates Zn 2 ⁺ ion migration and ensures timely replenishment of the inner space of the membrane. The combination of the 3D structure and dual-gradient design fosters bottom-up zinc deposition, effectively preventing dendrite formation. Symmetric cells with this dual-gradient anode demonstrate outstanding cycling stability, maintaining more than 410 h of operation at a current density of 1 mA cm −2 for 1 mA h cm −2 , surpassing reference samples and most previously reported 3D zinc anodes. The quasi-solid-state ZIBs assembled with this dual-gradient anode exhibit excellent stability under various mechanical deformations. These 3D nanofibrous anodes with dual-gradient designs hold great promise for advancing the practical application of flexible Zn-ion batteries.
研究领域:
材料科学
·
能源存储技术
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS & DESIGN
·
2020
·
IF 6.289
Yanan Hao,Zunpeng Feng,Zhengda He,Jiameng Zhang,Xiaoming Liu,Jing Qin,Limin Guo,Ke Bi
Dielectric capacitors are key devices in pulsed power systems for their high power density. To improve the energy density, compact nanocomposite films comprising PVDF polymer and core-shell BaTiO 3 @TiO 2 nanoparticles are prepared, in which the BaTiO 3 ( d ~ 8 nm) nanoparticles are encapsulated by the amorphous TiO 2 shell layer. Compared to the conventional BaTiO 3 /PVDF nanocomposite, the BaTiO 3 @TiO 2 /PVDF nanocomposite in this report takes advantage of the small particle size and the gradient dielectric design of the interface, which enhances the electric displacement as high as 65% and the breakdown strength of 20% simultaneously. A maximal discharged energy density of 11.34 J·cm −3 is achieved under an electric field of 420 kV·mm −1 in the nanocomposite film containing 5 vol% BaTiO 3 @10 wt%TiO 2 . Therefore, the gradient design of ultrasmall dielectric nanofillers shows high potential in fabrication of high energy-density nanocomposite.
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
Small Methods
·
2024
·Vol. 8
·期 7
·2301233
·
IF 10.7
Xiaolin Ye,Ningxin Xiong,Shaopei Huang,Qixing Wu,Hongning Chen,Xuelong Zhou
Tin-based hybrid flow batteries have demonstrated dendrite-free morphology and superior performance in terms of cycle life and energy density. However, the quick accumulation of electrodeposits near the electrode/membrane interface blocks the ion transport pathway during the charging of the battery, resulting to a very limited areal capacity (especially at high current density) that significantly hinders its deployment in long-duration storage applications. Herein, a conductivity-activity dual-gradient design is disclosed by electrically passivating the carbon felt near the membrane/electrode interface and chemically activating the carbon felt near the electrode/current collector interface. In consequence, the tin metals are preferentially plated at the region near electrode/current collector, preventing the ion transport pathway from being easily blocked. The resultant gradient electrode demonstrated an unprecedentedly high areal capacity of 268 mAh cm −2 at a current density of as high as 80 mA cm −2 . Numerical modeling and experimental characterizations show that the dual-gradient electrode differs from conventional electrodes with regard to their reaction current density distribution and electrodeposit distribution during charging. This work demonstrates a new design strategy of 3D electrodes for hybrid flow batteries to induce a desirable distribution of electrodeposits and achieve a high areal capacity at commercially relevant current densities.
研究领域:
电化学储能
·
材料科学
·
能源化学
·
电池技术
·
功能材料
·
电化学工程
✓ 已验证
DOI
高影响因子
DENTAL MATERIALS
·
2024
·
IF 4.6
Qiuyi Li,Yongzhe Liu,Delu Zhao,Yupu Yang,Qibo Liu,Yujun Zhang,Junling Wu,Zheqin Dong
Objective Stress concentration and excessive wear on the opposite jaw teeth are the main problems that lead to the failure of all-ceramic crown restoration. The objectives of this study were to: (1) Synthesize the biomimetic gradient zirconia/resin composites. (2) Control the porosity and structure so that the mechanical properties of the biomimetic gradient zirconia/resin composites are close to enamel and dentin. Methods Biomimetic uniform zirconia scaffolds with different widths (1.6 mm, 1.8 mm, 1.9 mm, 2.0 mm, 2.2 mm) and Biomimetic gradient (1.6 mm-2.2 mm) zirconia scaffolds were designed using 3DMax and Magics, fabricated by digital light processing 3D printing, and then infiltrated into dental resin for mechanical testing, finite element simulation and cytotoxicity testing. Results Results show that the ceramic-polymer composites exhibit a significant enhancement in strength (1.37-fold increase) and toughness (2.08-fold increase) compared to zirconia ceramic scaffold (P < 0.05), highlighting the effectiveness of our structural design. In addition, the gradient design further improves the mechanical strength of the composites. Notably, the gradient composite crown exhibits a bending strength of 138.3 (±16.7) MPa, a toughness of 9.0 (±0.5) MJ/m³, and a compressive strength of 113.7 (±2.6) MPa, values that are comparable to those of natural enamel and dentin, and shows good biosafety. Conclusion Biomimetic gradient zirconia/dental resin materials were precisely fabricated through a series of studies, which is expected to further improve the clinical treatment effect. At the same time, the strategic design also provides new ideas for the performance improvement of other dental materials. Significance Gradient zirconia/resin composite materials with mechanical properties matching natural teeth were precisely fabricated, and are expected to significantly improve clinical treatment outcomes. Additionally, the strategic design provides new insights for enhancing the performance of other dental materials.
研究领域:
牙科材料
·
生物医学工程
·
材料科学
·
机械工程
·
3D打印技术
·
仿生学
✓ 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）