CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Chen Huang,Lingyu Zhang,Song Liu,Yao Wang,Nü Wang,Yuan Deng
Encapsulating ferroelectric ceramic nanofillers into polymer matrix with various architectures has been demonstrated as an effective strategy for ultrahigh energy storage density. Nevertheless, large discrepancy in permittivities between ceramic fillers and polymer requires sophisticated interfacial modification to alleviate local charge concentration. The idea to design graded permittivity from the filler center to surrounding matrix in composites is promising, yet remains a big challenge. Here coaxial electrospinning technique has been employed to control the polarization gradient distribution in TiO 2 nanofibers (TO nf ) and poly(vinylidene fluoride)/poly(vinylidene fluoride-co-trifluoroethylene) [PVDF/P(VDF-TrFE)] core-shell structured hybrid nanocomposites system where TO nf is fixed at volume fraction 2%, and the polarization gradient of the polymer is adjusted via altering the volume ratios of PVDF and P(VDF-TrFE) in the coaxial electrospun polymer blends in two layers, respectively. Compared with nanocomposites made from mixed solution electrospun randomly and oriented TO nf -PVDF/P(VDF-TrFE) at the same constituent volume fraction, the dielectric losses of coaxial-spun films decrease more than twice, from 0.087 for random nanocomposite film to 0.028, and more intriguingly, the discharged energy storage density ( U e ) doubled increasing from 6.5 J cm −3 for random nanocomposite film to 12.7 J cm −3 for coaxial electrospun film with medium polarization gradient. Finite element analyses reveal the polarization and local electric field distribution in the nanocomposites with various polarization gradient design, and the results unambiguously demonstrate that U e can be significantly boosted via controlled polarization gradient design.
研究领域:
材料科学
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电气工程
·
纳米技术
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DOI
高影响因子
Energy Materials
·
2026
·Vol. 6
·期 6
·N
·
IF 11.9
Yabo Wu,Zhiqiang Zhang,Yihao Zhang,Zhaoxin Ma,Changji Deng,Song Zhang,Bowen Bai,Weicong Liu,Yifan Huang,Qingfeng Zhang,Yongming Hu
Polymer dielectrics are promising materials for electrostatic capacitors because of their high dielectric strength and fast charge-discharge capability. However, improving the energy-storage density of fluorinated ferroelectric polymers remains challenging because enhanced polarization is often accompanied by reduced breakdown strength. In this work, all-organic poly(vinylidene fluoride- trifluoroethylene-chlorofluoroethylene)/poly(methyl methacrylate) [P(VDF-TrFE-CFE)/PMMA] dielectric films are prepared by solution blending and casting. By tuning the blend ratio, the intermolecular interactions and crystallization behavior of the films are systematically regulated, resulting in distinct changes in their electrical properties. The results suggest that dipolar interactions between PMMA carbonyl groups and polar groups in P(VDF-TrFE-CFE) disturb chain packing and suppress crystallization, thereby reducing dielectric loss and improving breakdown stability. At the optimized composition, the P(VDF-TrFE-CFE)/PMMA (50/50 wt.%) film delivers a dischaged energy density of 17.12 J/cm3 with an energy-storage efficiency of 88.11%. Further γ-irradiation of the optimized film at doses of 10-150 kGy leads to additional improvement in dielectric energy-storage performance. These results demonstrate that regulating intermolecular interactions and crystalline morphology through all-organic blending and irradiation is an effective strategy for developing high-performance polymer dielectrics.
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高影响因子
ACS Sustainable Chemistry & Engineering
·
2026
·
IF 7.6
Yueyuan Liu,Feifei Wang,Xiaozhe Chen,Fuhui Cui,Yang Lu,Rongke Gao,Liandong Yu
The widespread application of Internet of Things (IoT) technology promotes the miniaturization and intelligent development of electronic devices, posing significant challenges to the effective microenergy harvesting and optimization of self-powered devices. Here, we present NaNbO3/P(VDF-TrFE)-based piezoelectric nanogenerators (NP-PENGs) based on femtosecond laser surface modification for bioenergy harvesting and human motion monitoring. In this study, NaNbO3 nanoparticles are synthesized by liquid-phase pulsed laser ablation, and the phase structure of P(VDF-TrFE)-based composite materials is processed by femtosecond laser surface modification. The aim is to establish a synergistic system of nanoparticle induction and laser precise control to enhance the content of the β-phase in three dimensions from nucleation initiation, orientation control, and structural stability. Importantly, the output potential of flexible P(VDF-TrFE) and 5 wt % NaNbO3/P(VDF-TrFE)-based PENGs after femtosecond laser processing can reach 26.1 V (36% improvement) and 40 V (52% improvement), respectively. Furthermore, the flexible PENG exhibits great stability under cyclic mechanical stress for 3000 s and successfully powers 20 LEDs. By attaching the NP-PENG to various parts of the human body, it can not only precisely sense human motion status but also real-time monitor the output voltage changes. This study provides an efficient and straightforward method for achieving precise control of high β-phase content and high-performance PENGs, and it demonstrates its enormous potential in the field of intelligent wearable devices.
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高影响因子
DALTON TRANSACTIONS
·
2018
·Vol. 47
·期 36
·12759-12768
·
IF 4.099
Kun Qian,Xuguang Lv,Sheng Chen,Hang Luo,Dou Zhang
Dielectric polymer-based nanocomposites have attracted significant attention in recent years for energy storage applications because of their potential high permittivity and breakdown strength. The coupling effect of a nanofiller/matrix interface plays a crucial role in the dielectric and electric properties of polymer-based nanocomposites. In this paper, three kinds of side-chain liquid crystalline fluoric-polymers, denoted as P-nF (n = 3, 5 or 7, which is the number of terminal fluoric groups), were grafted on the surface of BaTiO3 nanoparticles by a surface-initiated reversible-addition–fragmentation chain transfer polymerization method. The nanocomposite films were prepared via core–shell BaTiO3 nanoparticles dispersed in a poly(vinylidene fluoride-trifluoroethylene-chlorotrifluoroethylene) P(VDF-TrFE-CTFE) polymer matrix. The frequency dependent dielectric properties and energy storage capability of the polymer nanocomposites were studied. The results showed that the permittivity and energy densities of the polymer nanocomposites depended on the molecular structure of the modifier, especially the number of electron-rich fluoric groups. Firstly, all modified BaTiO3 nanoparticles were homogeneously dispersed in the polymer matrix, resulting in the polymer nanocomposites presenting a higher breakdown strength compared with the unmodified BaTiO3 nanoparticles. Secondly, the changes in the nanocomposites’ permittivity exhibited diversity for three modifiers due to many influential factors. Thirdly, compared with neat P(VDF-TrFE-CTFE), the discharge energy densities of the polymer nanocomposites are all significantly improved. The highest discharge energy densities of nanocomposites with 5 vol% P-3F@BT reached 14.5 J cm−3. These findings suggest that the optimal interfacial modifier should be carefully decided by combining various properties of the nanocomposites for energy storage.
研究领域:
材料科学
·
能源存储
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产品关联
DOI
PubMed
高影响因子
SENSORS AND ACTUATORS A-PHYSICAL
·
2026
·
IF 5.1
Tongrui Xian,Jiangtao Zhou,Chen Cao,Qiwei Zheng,Yan Peng,Peilun Yin,Xiaohui Tang,Zhongjie Li
Post-poling-free P(VDF-TrFE)/BTO nanofiber sensors prepared by electrospinning. • A β-phase content of 82.86% was achieved through in-situ electric field orientation and interfacial polarization. • Sensor shows 530.6 mV·kPa −1 sensitivity (0.33–3.33 kPa), 21 ms response time, and excellent durability. • A complete "material–device–circuit–virtual feedback" closed-loop interactive system was constructed. With the rapid advancement of the Internet of Things (IoT) and artificial intelligence (AI), the paradigm of human-machine interaction is shifting toward immersive and multidimensional experiences. In this study, a post-poling-free P(VDF-TrFE)/BTO (PVTB) composite nanofiber sensor with high electroactivity was fabricated by leveraging the synergy between charge trapping and interfacial polarization at the BTO/P(VDF-TrFE) interface, combined with in-situ electric-field orientation during electrospinning. The resulting nanofibers exhibit a mean diameter of 469.8 ± 168.2 nm, and the PVTB membrane achieves a high β-phase content of 82.86%. The PVTB sensor exhibits a sensitivity of 530.6 mV·kPa −1 within the low-pressure range of 0.33–3.33 kPa and 18.2 mV·kPa −1 within the pressure range of 3.33–83.33 kPa, with a minimum detectable force of 0.2 N, a response time of 21 ms, and 88.1% voltage retention after 10000 loading cycles. The PVTB sensor enables effective monitoring of ultra-weak muscle tremor signals, while finger tapping produces an output voltage of approximately 0.4 V. A four-channel “material-device-circuit-virtual feedback” closed-loop interactive system was constructed, demonstrating the potential of flexible piezoelectric sensors in immersive human-machine interaction and providing a precise digital approach for movement disorder rehabilitation. Download: Download high-res image (184KB) Download: Download full-size image
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高影响因子
ADVANCED FUNCTIONAL MATERIALS
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2025
·
IF 19
Da Zu,Zhanpeng Zhang,Dongliang Shan,Wenjun Cao,Yunya Liu
The thermal failure bottleneck in high-power polymer capacitors severely limits their energy storage performance breakthroughs. Composite materials combining excellent thermal management capabilities with high energy storage density represent an effective solution to this problem. This study proposes an integrated energy storage-thermal management design strategy: using a relaxor ferroelectric polymer P(VDF-TrFE-CFE) as the matrix and incorporating Ba 0.6 Sr 0.4 TiO 3 (BST) nanoparticles with varying weight fractions (0–23.08 wt.%) to construct high-performance polymer-based nanocomposites. By synergistically regulating the interfacial polarization effect and polarization entropy change, dual breakthroughs in electrocaloric (EC) cooling and energy storage performance are achieved. This study employs infrared thermal imaging technology to directly measure the EC response of composite films. Experimental results show that when the BST weight fraction is 16.67 wt.%, the composite achieves optimal overall performance: under an electric field of 110 MV m −1 , the recoverable energy density W rec reaches 4.26 J cm −3 , which is a 20.34% improvement over the pure polymer, with the η of 70.17%; under an electric field of 100 MV m −1 , the EC temperature change reaches 5 °C, representing a 32.63% enhancement compared to the pure polymer. Therefore, this work achieves a synergistic enhancement of dielectric energy storage and EC cooling performance within a single material system.
研究领域:
材料科学
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能量存储
·
介电材料
·
热管理
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铁电聚合物
·
纳米复合材料
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DOI
高影响因子
ADVANCED MATERIALS
·
2025
·Vol. 37
·期 43
·e07832
·
IF 26.8
Tianhao Chen,Zhefeng Liu,Sha. Sha,Rui Wang,Siwei Chen,Yalan Sun,Hancong Zheng,Aihua Chen
Solar ultraviolet (UV) radiation, a primary cause of skin cancer and erythema, poses irreversible risks to human health, underscoring the urgent need for advanced solar UV detector. Herein, we present a novel intrinsically flexible UVA detector featuring real-time monitoring, high performance and recyclability. This breakthrough is achieved through engineered oriented composite fabrics combining main-chain azobenzene-thermoplastic polyurethane elastomers (Az-TPU) with piezoelectric poly(vinylidene fluoride-trifluoroethylene) [P(VDF-TrFE)] nanogenerators. The molecular architecture employs azobenzene groups and 4,4′-methylene diphenyl diisocyanate (MDI) as hard segment, while polytetramethylene ether glycol (PTMG) forms the soft segment. The physical cross-linking network and homogeneous microphase-separated structure enables the fabrics to generate substantial internal stress, resulting in superior photoelectrical conversion capabilities. The device we report achieves an 80 ms response time and maintains excellent linear correlation (R 2 = 0.997) across a broad light intensity range (0.05–50 mW·cm −2 ). Remarkably, the fabric achieves dynamic UV light monitoring when subjected to a tensile strain of 10%. Integrated with Bluetooth communication, the device enables real-time data transmission to mobile devices for continuous UVA intensity and dose monitoring throughout daily sunlight exposure. With demonstrated capability for solar UVA measurement, this technology presents significant industrial potential for wearable solar UV monitoring systems.
研究领域:
材料科学
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可穿戴电子学
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光电探测器
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环境监测
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生物医学工程
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DOI
PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2025
·
IF 5.4
Zhenji Zhou,Caiyin You,Jizhe Jia,Weimin Xia,Zhong Li,Heguang Liu,Na Tian
Polyvinylidene difluoride (PVDF) and its copolymers are commonly used in triboelectric nanogenerators (TENGs) due to their flexibility and good mechanical–electrical properties. In this study, poly[(vinylidene fluoride)-co-trifluoroethylene] [P(VDF-TrFE)] composites were fabricated by embedding polydopamine (PDA)-coated cobalt ferrite nanorods (RCFO). A stripe-like microstructure was formed by applying a magnetic field during the curing process. The TENG was built with a polytetrafluoroethylene (PTFE) film as the negative friction material. Due to the enhanced micro–nano structure of the P(VDF-TrFE) films, the increased charge transfer occurred between the RCFO@PDA/P(VDF-TrFE) composite film and the PTFE film. Good triboelectric performance was realized, with an open-circuit voltage of 33.20 V, a short-circuit current of 1.20 μA, and a transferred charge of 13.17 nC at a frequency of 5 Hz and a vertical contact force of 15 N. Additionally, a peak power density of 32.5 μW cm −2 was achieved when connected to an external load resistor of 20 MΩ. In practical applications, the TENG could directly illuminate a series of 36 connected light-emitting diodes without the need for capacitors. The device's ability to capture stray magnetic fields was also demonstrated. A wireless transmission-based remote security system was demonstrated as the self-powered sensor in a noncontact mode.
研究领域:
纳米技术
·
能量收集
·
传感器
·
无线通信
·
安全系统
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材料科学
·
聚合物复合材料
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DOI
高影响因子
Nano Energy
·
2022
·
IF 19.069
Hongsen Niu,Hao Li,Yang Li,Wenjing Yue,Song Gao,Xiao Wei,Guozhen Shen
Traditional electronic skin (e-skin) with single micro-nano structures has a limited capacity to optimize the comprehensive sensing properties, which greatly hinders the intellectualization process. Herein, cocklebur-inspired bionic e-skin consisting of the “branch-seed-spininess” three-dimensional hierarchical structure, namely the P(VDF-TrFE) fiber-TiO 2 pillar-TiO 2 thorn structure (FPTS), is proposed. Benefiting from the hierarchical characteristics of the FPTS, the e-skin exhibits a high sensitivity of 0.163 kPa −1 (<20 kPa), wide pressure sensing range of 0–200 kPa, and ultrafast response/relaxation time of < 5.6 ms. In light of these salient features , versatile intelligent perception applications are explored. First, robot fingers are equipped with the FPTS e-skins and realize the traditional Chinese medicine pulse diagnosis of the radial artery in different positions and pressing degrees. Second, a flexible perception array with 100 FPTS e-skin units enables the spatial pressure mapping of flat/curved surfaces and the perception of different Braille characters. Most importantly, by making full use of the FPTS e-skin with a five-layer deep neural network , an intelligent gesture perception system is developed for accurate recognition (average accuracy: 98.33%) of sign language and precise control of the robot hand, which is of great significance for the development of intelligent sign language translation in artificial intelligence.
研究领域:
材料科学
·
机器人技术
·
人工智能
·
生物医学工程
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DOI
高影响因子
ADVANCED MATERIALS
·
2024
·
IF 27.4
Dongyu Xu,Siqi Fu,Hui Zhang,Weicheng Lu,Jingdun Xie,Jilai Li,Huan Wang,Yuanjin Zhao,Renjie Chai
Nerve guidance conduits (NGCs) are considered as promising treatment strategy and frontier trend for peripheral nerve regeneration, while their therapeutic outcomes are limited by the lack of controllable drug delivery and available physicochemical cues. Herein, novel aligned piezoelectric nanofibers derived hydrogel NGCs with ultrasound (US)-triggered electrical stimulation (ES) and controllable drug release for repairing peripheral nerve injury are proposed. The inner layer of the NGCs is the barium titanate piezoelectric nanoparticles (BTNPs)-doped polyvinylidene fluoride-trifluoroethylene [BTNPs/P(VDF-TrFE)] electrospinning nanofibers with improved piezoelectricity and aligned orientation. The outer side of the NGCs is the thermoresponsive poly(N-isopropylacrylamide) hybrid hydrogel with bioactive drug encapsulation. Such NGCs can not only induce neuronal-oriented extension and promote neurite outgrowth with US-triggered wireless ES, but also realize the controllable nerve growth factor release with the hydrogel shrinkage under US-triggered heating. Thus, the NGC can positively accelerate the functional recovery and nerve axonal regeneration of rat models with long sciatic nerve defects. It is believed that the proposed US-responsive aligned piezoelectric nanofibers derived hydrogel NGCs will find important applications in clinic neural tissue engineering.
研究领域:
生物医学工程
·
神经组织工程
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药物递送系统
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材料科学
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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）