Composites Science and Technology最新文献_第7页

Engineering cellulose nanofibril aerogel for reinforcing polymethyl methacrylate with superior mechanical strength, high transparency, and improved thermal stability 用于增强聚甲基丙烯酸甲酯的工程纤维素纳米纤维气凝胶，具有卓越的机械强度、高透明度和更好的热稳定性

IF 8.3 1区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES

Composites Science and Technology

Pub Date : 2024-10-02 DOI: 10.1016/j.compscitech.2024.110894

Yaxin Duan , Hongbin Yang , Yue Niu , Ying Han , Aoran Wang , Hongxiang Xie , Ting Xu , Mengge Gao , Chuanling Si

In this study, a new strategy for preparing cellulose nanofibers/polymethyl methacrylate (CNF/PMMA) composite with high strength and high transmittance was developed. The UV curing technique was adopted to induce the polymerization of MMA and the grafting modification of methacryloylated CNF aerogel (CNF_MA). The compatibility between CNF aerogel and PMMA was significantly improved through the grafting modification of CNF aerogel. The cold ultraviolet photopolymerization strategy makes the polymerization reaction much milder. The transmittance of the CNF_MA/PMMA composite was 86.45 %, showing only a slight reduction compared to PMMA. Its tensile strength increased to 69.21 MPa, about twice that of PMMA, and 1.5 times that of CNF_pure/PMMA, proving the interaction between CNF and PMMA was greatly enhanced due to the successful grafting of PMMA onto the surface of CNF. The glass transition temperature is 108.1 °C, which increased by nearly 20 %. The thermal stability has also been improved, as reflected by a 10 % increase in the initial pyrolysis temperature. Overall, this work provides a mild and green preparation method for CNF/PMMA composites, making them suitable for applications in the field of high-strength organic glass.

本研究开发了一种制备具有高强度和高透光率的纤维素纳米纤维/甲基丙烯酸甲酯（CNF/PMMA）复合材料的新策略。该研究采用紫外固化技术诱导甲基丙烯酸甲酯聚合，并对甲基丙烯酸甲酯气凝胶（CNFMA）进行接枝改性。通过对 CNF 气凝胶的接枝改性，CNF 气凝胶与 PMMA 的相容性得到了显著改善。冷紫外光聚合策略使聚合反应更为温和。CNFMA/PMMA 复合材料的透光率为 86.45%，与 PMMA 相比仅略有降低。其拉伸强度增至 69.21 兆帕，约为 PMMA 的两倍，是 CNFpure/PMMA 的 1.5 倍，证明由于 PMMA 成功接枝到 CNF 表面，CNF 与 PMMA 之间的相互作用大大增强。玻璃化转变温度为 108.1 °C，提高了近 20%。热稳定性也得到了改善，初始热解温度提高了 10%。总之，这项工作为 CNF/PMMA 复合材料提供了一种温和、绿色的制备方法，使其适合应用于高强度有机玻璃领域。

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引用次数: 0

Functional and structural construction of photothermal-responsive PEEK composite implants to promote bone regeneration and bone-implant integration 构建光热响应型 PEEK 复合植入体的功能和结构，促进骨再生和骨植入体整合

IF 8.3 1区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES

Composites Science and Technology

Pub Date : 2024-10-02 DOI: 10.1016/j.compscitech.2024.110885

Wenchao Li , Zhengnan Su , Yanru Hu , Lihui Meng , Fang Zhu , Bin Xie , Zilin Zhou , Shuojie Cui , Meng Wang , Qingzhi Wu , Shun Yao

Although poly (ether-ether-ketone) (PEEK) has been widely used in orthopedic surgeries, its clinical efficacy is challenged by ineffective bone regeneration and insufficient osteointegration. Herein, inspired by the Mortise-and-tenon joint in traditional Chinese architectural art, a novel strategy has been developed to construct photothermal-responsive PEEK composite implants, with tapered lock-groove edges as proof of concept, by incorporating graphene oxide (GO) loaded with polydopamine-coated nano-zirconia (PDA@ZrO₂) into PEEK (namely PGPZ composite). The PGPZ composite exhibits improved mechanical properties, good cytocompatibility and blood compatibility, excellent antibacterial ability and osteogenic activity remotely controlled by near-infrared irradiation (NIR). The cranial defects experiment on rabbits reveals that repeated NIR treatment on PGPZ composite implant significantly accelerates endogenous bone regeneration. More importantly, abundant newly-formed bone has materialized in the lock grooves, forming interlocked Mortise-and-tenon joints with the implant. This study not only pave the way for further clinical applications of the PEEK composite implants with improved bioactivities to promote bone regeneration and osteointegration, but also providing a novel strategy for structural and functional design of various tissue engineering implants.

尽管聚醚醚酮（PEEK）已被广泛应用于骨科手术，但其临床疗效却因骨再生效果不佳和骨结合力不足而受到质疑。本文受中国传统建筑艺术中榫卯结构的启发，通过在 PEEK 中加入氧化石墨烯（GO）和多巴胺包覆纳米氧化锆（PDA@ZrO2）（即 PGPZ 复合材料），开发出一种新的策略来构建具有锥形锁槽边缘的光热响应 PEEK 复合材料植入体，并以此作为概念验证。PGPZ 复合材料具有更好的机械性能、良好的细胞相容性和血液相容性、优异的抗菌能力以及可通过近红外辐射（NIR）远程控制的成骨活性。兔子颅骨缺损实验表明，对 PGPZ 复合材料植入物进行反复近红外处理可显著加速内源性骨再生。更重要的是，大量新形成的骨在锁沟中形成，与种植体形成互锁的榫卯连接。这项研究不仅为提高 PEEK 复合材料植入物的生物活性以促进骨再生和骨整合的进一步临床应用铺平了道路，还为各种组织工程植入物的结构和功能设计提供了一种新的策略。

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引用次数: 0

Directional thermal conductive PEG@BNNS composites enhanced tri-function passive radiative cooler for thermal management of high-power density devices 定向导热 PEG@BNNS 复合材料增强型三功能被动辐射冷却器，用于高功率密度设备的热管理

IF 8.3 1区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES

Composites Science and Technology

Pub Date : 2024-10-01 DOI: 10.1016/j.compscitech.2024.110889

Shen Zhao , Zhixiong Wu , Tao Wang , Yemao Han , Huiming Liu , Zhicong Miao , Rongjin Huang , Laifeng Li

The increasingly powerful computing capabilities of 5G technology are posing greater heat dissipation challenges for communications base stations. Passive radiative cooling, as a promising cooling strategy without energy consumption, however, is severely limited by its insufficient cooling power especially in the face of high heat flux conditions. Herein, we report a tri-function passive radiative cooler (TPRC) to enhance the cooling capacity through the synergistic effect of broadband radiative cooling, latent heat storage, and directional thermal conduction. Vacuum-assisted self-stacking, skeleton absorption and coating methods are used to fabricate TPRC. Under the heating power density of 4000 W/m², TPRC lowered the thermal equilibrium temperature to 74.1 °C, a reduction of 16 °C and 3.7 °C compared to the bare aluminum plate and single radiative film, respectively. The contributions of these three cooling types were analyzed and it revealed that optimizing thermal conduction can effectively improve cooling efficiency. Our work provides a comprehensive strategy for expanding the application of passive radiative cooling to high power density devices.

5G 技术日益强大的计算能力给通信基站带来了更大的散热挑战。被动辐射冷却作为一种前景广阔的无能耗冷却策略，却因冷却能力不足而受到严重限制，尤其是在高热通量条件下。在此，我们报告了一种三功能被动辐射冷却器（TPRC），通过宽带辐射冷却、潜热存储和定向热传导的协同效应提高冷却能力。TPRC 采用真空辅助自堆叠、骨架吸收和涂层方法制造。在加热功率密度为 4000 W/m2 的条件下，TPRC 将热平衡温度降至 74.1 °C，与裸铝板和单一辐射膜相比，分别降低了 16 °C和 3.7 °C。对这三种冷却方式的贡献进行了分析，结果表明，优化热传导可有效提高冷却效率。我们的工作为将被动辐射冷却应用扩展到高功率密度器件提供了全面的策略。

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引用次数: 0

Water-based PES-NaPSS sizing agent without surfactant for interface enhancement of CF/PEEK composites 用于增强 CF/PEEK 复合材料界面的不含表面活性剂的水基 PES-NaPSS 施胶剂

IF 8.3 1区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES

Composites Science and Technology

Pub Date : 2024-10-01 DOI: 10.1016/j.compscitech.2024.110892

Kaixuan Lei , Wenzhen Qin , Shulin Bai , Jianfan Cao , Liang Chen

Improving the weak interfacial bonding of carbon fiber (CF)/polyetheretherketone (PEEK) composites is an extremely urgent need. Addressing this issue, sizing modification on CF surfaces is a conventional and effective method. In this work, polyethersulfone-polystyrene sulfonate sodium (PES-NaPSS) was successfully synthesized by UV illumination. A novel surfactant-free aqueous PES-NaPSS sizing agent was prepared by emulsion/solvent evaporation method to regulate the interface of CF/PEEK composites. From the XPS and SEM results, it can be seen that PES-NaPSS was uniformly coated on the CF surfaces, which introduced the reactive groups on the CF surfaces. The PES-NaPSS sizing agent exhibits good thermal performance and storage stability, meeting the needs for high temperature processing of CF/PEEK composites. Compared with the unsized CF/PEEK composites, the ILSS, flexural strength and modulus of the 0.9 wt% PES-NaPSS modified CF/PEEK composite are improved by 32.8 %, 40.3 % and 37.4 %, respectively. Accordingly, the mechanisms of the interface improvement are physical riveting, chain entanglement, chemical and physical interactions between the PES-NaPSS and PEEK matrix. This green and effective method of interface improvement will supply a prerequisite for the extensive application of CF/PEEK composites.

改善碳纤维（CF）/聚醚醚酮（PEEK）复合材料的弱界面结合是一项极为迫切的需求。为解决这一问题，对 CF 表面进行施胶改性是一种传统而有效的方法。在这项工作中，通过紫外线照射成功合成了聚醚砜-聚苯乙烯磺酸钠（PES-NaPSS）。利用乳液/溶剂蒸发法制备了一种新型的无表面活性剂水性 PES-NaPSS 施胶剂，用于调节 CF/PEEK 复合材料的界面。从 XPS 和 SEM 结果可以看出，PES-NaPSS 均匀地涂覆在 CF 表面，在 CF 表面引入了活性基团。PES-NaPSS 施胶剂具有良好的热性能和储存稳定性，可满足 CF/PEEK 复合材料高温加工的需要。与未施胶的 CF/PEEK 复合材料相比，0.9 wt% PES-NaPSS 改性 CF/PEEK 复合材料的 ILSS、弯曲强度和模量分别提高了 32.8%、40.3% 和 37.4%。因此，界面改善的机理是 PES-NaPSS 与 PEEK 基体之间的物理铆接、链缠结、化学和物理相互作用。这种绿色、有效的界面改善方法将为 CF/PEEK 复合材料的广泛应用提供先决条件。

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引用次数: 0

Molecular dynamics simulations of thermomechanical properties of silicone-modified phenolic polymer 硅改性酚醛聚合物热力学特性的分子动力学模拟

IF 8.3 1区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES

Composites Science and Technology

Pub Date : 2024-09-30 DOI: 10.1016/j.compscitech.2024.110878

Jie Xiao, Guodong Fang, Bing Wang, Changqing Hong, Songhe Meng

The silicone-phenolic multicomponent polymers are typically employed as the matrix of fiber-reinforced nanocomposites developed for reentry vehicles due to their excellent thermal and mechanical properties. The thermomechanical properties of the silicone-phenolic multicomponent polymer system, which are greatly related to the processing and microstructures, were studied using molecular dynamics (MD) simulations combined with experiments. A multistep dynamic polymerization approach was utilized to form the crosslinked polymer model, which was also validated in terms of both microstructures and properties. The thermomechanical properties of the crosslinked polymer system were established as a function of crosslinking degree, component ratio, temperature, strain rate, and cooling rate, and the influence mechanisms of the processing parameters were revealed. The crosslinking degree can greatly influence the glass transition temperature and volumetric coefficient of thermal expansion, which is attributed to the constrained chain mobility. The crosslinking degree and the component ratio have a significant effect on the morphologies and vibrational density of states of the polymer system, respectively, which in turn affects the thermal conductivity. The failure mode during uniaxial tensile was investigated in terms of the atomic energy distribution through MD simulations. The elastic and plastic deformation stages are dominated by intermolecular non-bonding interactions, but less contributed by the bonding interactions. This work can guide the design of polymeric nanocomposites by establishing the relationship of processing-microstructure-thermomechanical properties.

有机硅-酚醛多组分聚合物因其优异的热性能和机械性能，通常被用作为重返大气层飞行器开发的纤维增强纳米复合材料的基体。分子动力学（MD）模拟与实验相结合，研究了有机硅-酚醛多组分聚合物体系的热机械性能，这些性能与加工过程和微观结构密切相关。利用多步动态聚合方法形成了交联聚合物模型，并从微观结构和性能两方面对该模型进行了验证。建立了交联聚合物体系的热力学性质与交联度、组分比例、温度、应变速率和冷却速率的函数关系，并揭示了加工参数的影响机制。交联度会对玻璃化温度和体积热膨胀系数产生很大影响，这归因于受约束的链流动性。交联度和组分比分别对聚合物体系的形态和振动态密度有显著影响，进而影响热导率。通过 MD 模拟，从原子能量分布的角度研究了单轴拉伸过程中的破坏模式。在弹性和塑性变形阶段，分子间的非键相互作用占主导地位，而键相互作用的贡献较小。这项研究通过建立加工-微结构-热机械性能之间的关系，为聚合物纳米复合材料的设计提供了指导。

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引用次数: 0

Fabrication and in-plane compressive collapse of CFRP honeycomb metamaterials CFRP 蜂窝超材料的制作和平面内压缩塌陷

IF 8.3 1区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES

Composites Science and Technology

Pub Date : 2024-09-30 DOI: 10.1016/j.compscitech.2024.110888

Zhipeng Wang , Jianfeng Li , Wei Zhang , Jinze Jiao , Yuan Yuan , Qinghua Qin

A pin-slot positioning method was proposed to fabricate carbon fiber reinforced polymer (CFRP) metamaterials of hexagonal and zero Poisson's ratio semi-re-entrant honeycombs with the same mass of monolayer continuous twill-woven carbon fiber/epoxy prepregs. The in-plane compressive collapse of CFRP honeycombs was explored through experiments and finite element (FE) simulations. Furthermore, analytical models were developed to predict the modulus and initial collapse stress of the hexagonal and semi-re-entrant honeycombs. Good agreement is achieved between analytical predictions, FE simulations and experimental results. It is shown that the initial collapse of CFRP honeycombs is by the bending of cell walls. Once initial collapse has been attained, both hexagonal and semi-re-entrant honeycombs have a stress softening. The collapse and failure modes of CFRP honeycombs strongly depend on cellular configurations and loading directions.

研究人员提出了一种针槽定位方法，利用相同质量的单层连续斜纹编织碳纤维/环氧树脂预浸料，制造出六边形和零泊松比半重向蜂窝的碳纤维增强聚合物（CFRP）超材料。通过实验和有限元（FE）模拟探讨了 CFRP 蜂窝的面内压缩塌陷。此外，还建立了分析模型来预测六角形和半重向蜂窝的模量和初始塌陷应力。分析预测、有限元模拟和实验结果之间取得了良好的一致性。研究表明，CFRP 蜂窝的初始坍塌是由蜂窝壁的弯曲造成的。一旦达到初始坍塌，六角形和半内凹蜂窝都会出现应力软化。CFRP 蜂窝的坍塌和破坏模式在很大程度上取决于蜂窝结构和加载方向。

引用次数: 0

Hygroscopic and hydrothermal aging behaviors and performance deterioration mechanisms of jute yarn wound composites 黄麻纱缠绕复合材料的吸湿和水热老化行为及性能劣化机理

IF 8.3 1区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES

Composites Science and Technology

Pub Date : 2024-09-30 DOI: 10.1016/j.compscitech.2024.110891

Jiangjing Shi , Tianhao Shen , Wenfu Zhang , Hong Chen , Changlei Xia

The gyratory jute yarn wound composites (JYWCs) manufactured by the filament winding process show significant potential as eco-friendly alternatives to plastic pipes commonly used in outdoor settings. Ensuring the long-term service performance and durability of the JYWCs in hot and humid environments becomes critical. This study investigated the hygroscopic and hydrothermal aging behaviors of the JYWCs to elucidate their performance deterioration mechanisms. Compared with hygroscopic aging, long-term hydrothermal aging posed a more serious threat to the overall performance of the JYWCs. The jute yarns in the JYWCs experienced swelling, shrinkage, and degradation due to hygroscopic and hydrothermal aging, leading to a 47.4 % and 161.5 % increase in the void volume fraction of the JYWCs, respectively. The deterioration in the mechanical properties of the JYWCs was attributed to the attenuation of jute yarn properties, debonding of the fiber-resin matrix interface, and an increase in voids within the composites. Improving the manufacturing process to minimize voids in the JYWCs and control the pathways for moisture absorption is a highly effective strategy to enhance their long-term performance and durability.

通过长丝缠绕工艺制造的回旋黄麻纱缠绕复合材料（JYWC）作为户外常用塑料管道的环保替代品，显示出巨大的潜力。确保 JYWCs 在高温潮湿环境中的长期使用性能和耐用性变得至关重要。本研究调查了 JYWC 的吸湿老化和水热老化行为，以阐明其性能劣化机制。与吸湿老化相比，长期水热老化对 JYWC 的整体性能构成了更严重的威胁。由于吸湿老化和水热老化，JYWC 中的黄麻纱经历了膨胀、收缩和降解，导致 JYWC 的空隙体积分数分别增加了 47.4% 和 161.5%。JYWCs 机械性能的下降归因于黄麻纱性能的衰减、纤维-树脂基体界面的脱粘以及复合材料内部空隙的增加。改进生产工艺以尽量减少 JYWCs 中的空隙并控制吸湿途径，是提高其长期性能和耐用性的一项非常有效的策略。

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引用次数: 0

Atomic force microscopy-based nanoindentation technique for characterizing the transverse and shear moduli of flax fibers 基于原子力显微镜的纳米压痕技术表征亚麻纤维的横向和剪切模量

IF 8.3 1区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES

Composites Science and Technology

Pub Date : 2024-09-30 DOI: 10.1016/j.compscitech.2024.110890

P.V. Divakarraju , V. Pandurangan , M. Nithyadharan

Experimentally evaluating the elastic properties of flax fibers is challenging due to their complex hierarchical structure, and a standard test procedure for measuring their transverse and shear moduli is currently not reported in the literature. Hence, this study presents an atomic force microscopy (AFM) based nanoindentation technique to evaluate the transverse and shear moduli of flax fiber. A high-precision focused ion beam (FIB)-milling process was used to fabricate a flat surface for indentation along the longitudinal fiber cross-section of the fiber and transverse fiber cross-section by polishing the unidirectional (UD) lamina in order to evaluate the indentation modulus. Further, Swanson's numerical contour approach was adopted to evaluate the elastic properties of the fiber from the measured indentation modulus. The accuracy of the experimentally obtained fiber properties is verified by using it in a micromechanics model for predicting the elastic properties of the UD lamina and comparing it with experimental results reported in the literature.

由于亚麻纤维具有复杂的层次结构，因此对其弹性特性进行实验评估具有挑战性，目前文献中还没有关于测量其横向和剪切模量的标准测试程序的报道。因此，本研究提出了一种基于原子力显微镜（AFM）的纳米压痕技术来评估亚麻纤维的横向和剪切模量。采用高精度聚焦离子束（FIB）铣削工艺，沿着纤维的纵向纤维横截面和横向纤维横截面，通过抛光单向（UD）薄片，制造出用于压痕的平面，以评估压痕模量。此外，还采用了斯旺森数值轮廓方法，根据测得的压痕模量评估纤维的弹性特性。通过在微观力学模型中使用实验获得的纤维特性来预测 UD 薄片的弹性特性，并将其与文献中报道的实验结果进行比较，从而验证了实验获得的纤维特性的准确性。

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引用次数: 0

Aspect ratio-dependent volume resistivity in unidirectional composites: Insights from electrical conduction behavior 单向复合材料中与长宽比相关的体积电阻率：从电传导行为中获得的启示

IF 8.3 1区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES

Composites Science and Technology

Pub Date : 2024-09-28 DOI: 10.1016/j.compscitech.2024.110887

Gen Li, Tianwei Wu, Junjie Zhang, Frew Asamnewu Fikru, Baozhong Sun, Bohong Gu

The electrical properties of carbon fibers serve as the foundation for the multifunctional applications of carbon fiber-reinforced composite structures. In scenarios that exploit the electrical characteristics of materials, accurate estimation of electrical resistivity stands as a critical factor. This study endeavors to elucidate the electrical conduction behaviors in unidirectional composites with different fiber orientation angles (0°, 15°, 30°, 45°, 60°, 75°, and 90°) and aspect ratios, thereby deriving the volume resistivity within an arbitrary Cartesian coordinate system. Employing thermal infrared imaging technology and finite element analysis, we identified distinctive electrical conduction behaviors associated with aspect ratios in carbon fiber composite plates. Notably, a critical aspect ratio exists wherein the diagonal yarn is the only conductive path between two electrodes. Below this critical threshold, no direct conductive path exists, and current flows through the shortest distance between parallel yarns. Conversely, beyond the critical aspect ratio value, multiple yarns form conductive paths between the two electrodes. Based on the electrical conduction behavior of unidirectional composites under different angles and aspect ratios, the volume resistivity with finite boundaries was derived and examined under an arbitrary Cartesian coordinate basis.

碳纤维的电特性是碳纤维增强复合材料结构多功能应用的基础。在利用材料电气特性的应用场景中，准确估算电阻率是一个关键因素。本研究致力于阐明不同纤维取向角（0°、15°、30°、45°、60°、75°和 90°）和长宽比的单向复合材料的导电行为，从而推导出任意直角坐标系中的体积电阻率。利用热红外成像技术和有限元分析，我们确定了碳纤维复合板中与纵横比相关的独特电导行为。值得注意的是，在对角线纱线是两个电极之间唯一导电路径的情况下，存在一个临界纵横比。在此临界值以下，不存在直接导电路径，电流流经平行纱线之间的最短距离。相反，超过临界纵横比值时，多根纱线会在两个电极之间形成导电路径。根据单向复合材料在不同角度和纵横比下的导电行为，推导出了有限边界的体积电阻率，并在任意笛卡尔坐标基础上对其进行了研究。

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引用次数: 0

3D printing enhanced piezoelectricity of MXene/P(VDF-TrFE) composites for energy harvesting and force sensing 三维打印增强 MXene/P(VDF-TrFE)复合材料的压电性，用于能量采集和力传感

IF 8.3 1区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES

Composites Science and Technology

Pub Date : 2024-09-27 DOI: 10.1016/j.compscitech.2024.110881

Ceng Li , Ziyue Huang , Liang Zhang , Zifei Song , Ying Chen , Xiangwu Chang , Penghao Hu

In pursuit of advanced self-powered wearable devices, piezoelectric materials have aroused great attention due to their stable energy harvesting ability from surroundings. However, traditional piezoelectric polymer-based nanogenerators necessitate a high-energy process to align the dipoles of the polymer, which is cumbersome, expensive, and could even lead to material deterioration. To address this challenge, we present a composite strategy with self-poling capability enabled by the extrusion-based 3D printing. MXene nanosheets were introduced into the fluoropolymer poly(vinylidene fluoride-co-trifluoroethylene) (PVDF-TrFE) to provide strong hydrogen bonding as anchors. Under the shear stress generated by the extrusion process, the alignment of the dipoles was realized without additional treatment. The resulting piezoelectric nanogenerator exhibits an open-circuit voltage of 5.5 V, a short-circuit current of 1.1 μA, and the output power density of 68 μWcm⁻³ under the force of 22 N and a frequency of 2 Hz. A self-powered sensor was assembled and demonstrated high sensitivity for human motions and facial expressions. Moreover, the 3D-printed piezoelectric composites present good flexibility, which is a crucial property for wearable devices. With the free design capabilities of the 3D printing technology, this strategy may pave the way for customized and feasible processing of high-performance piezoelectric nanogenerators and force sensors.

在追求先进的自供电可穿戴设备的过程中，压电材料因其能够稳定地从周围环境中收集能量而备受关注。然而，传统的基于压电聚合物的纳米发电机必须采用高能量工艺来调整聚合物的偶极子，这种工艺既麻烦又昂贵，甚至会导致材料老化。为了应对这一挑战，我们提出了一种复合策略，通过基于挤压的三维打印技术实现自校正能力。我们在氟聚合物聚偏二氟乙烯-共三氟乙烯（PVDF-TrFE）中引入了 MXene 纳米片，以提供强大的氢键作为锚。在挤压过程产生的剪切应力作用下，无需额外处理即可实现偶极子的排列。由此产生的压电纳米发电机在 22 N 的力和 2 Hz 的频率下，开路电压为 5.5 V，短路电流为 1.1 μA，输出功率密度为 68 μWcm-3。自供电传感器已组装完成，对人体运动和面部表情具有高灵敏度。此外，三维打印压电复合材料具有良好的柔韧性，这对于可穿戴设备来说是至关重要的特性。借助三维打印技术的自由设计能力，这一策略可为定制和加工高性能压电纳米发电机和力传感器铺平道路。

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引用次数: 0