APPLIED THERMAL ENGINEERING
·
2025
·
IF 6.9
Weiyang Guo,Lixin Song,Huijia Wang,Jingzhao Liu,Ni Li,Yili Zhao,Jie Xiong
Radiative-cooled textiles are attracting attention because they can spontaneously lower the microenvironmental temperature of the human body. The radiative cooling and hydrophobic fabric was prepared by two-step dip-coating on PET fabric with a ZnO/P(VDF-HFP) as radiative cooling coating and a PDMS hydrophobic wear-resistant layer. The effect of morphology (sheet, hexagonal prism, flower, and rod) of ZnO nanomaterial on the radiative cooling property of the coated fabric was examined. Among the four types of ZnO, the ZnO sheets have the highest sunlight reflectivity of 0.827. Besides, P(VDF-HFP) is a binder that loads ZnO onto PET fibers and enhances the solar reflectivity of coated fabric by reflecting visible light. Hence, the ZnO sheet/P(VDF-HFP)-PDMS (Z S PP) coated fabric possessed a solar reflectance of up to 91.3 % under the synergistic effect of ZnO sheets and P(VDF-HFP), and due to specific functional groups (e.g. C–F, C–Si) in the hybrid coating, and its mid-infrared emissivity reached 93.2 %. As a result, the Z S PP coated fabric were 7.1 °C cooler than the PET fabric under direct sunlight, with an average cooling efficiency of 72.6 W·m −2 . The coated fabric demonstrated well-hydrophobic and durability properties due to the PDMS, making them much more suitable for use in complex outdoor environments.
研究领域:
材料科学
·
纺织工程
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS A-PHYSICAL
·
2017
·
IF 2.499
Dou Zhang,Zhong Wu,Xue-fan Zhou,An-qi Wei,Chao Chen,Hang Luo
Dielectric materials with high energy storage density are attracting scientific and commercial interest due to the prospect of application in advanced electronic devices and electric power systems. Ceramic/polymer composite is one of the most promising materials to obtain high energy density because it combines high permittivity from ceramic and high breakdown strength as well as flexibility from polymer matrix. However, the homogeneous dispersion and compatibility of nanoparticles in polymers matrix are still of great challenges due to the different surface energy between inorganic fillers and organic polymer matrix. Interfaces modification for ceramic fillers is an effective way to ease the mentioned problems. Herein, we proposed a low-cost and environmentally friendly route to prepare a core–shell structure by paraffin engineer the BaTiO 3 nanoparticles. The modified BaTiO 3 nanoparticles exhibited homogeneous dispersion in the ferroelectric polymer poly(vinylidene fluoride-co-hexafluoropropylene) (P(VDF-HFP)) matrix and strong interfacial adhesion with the polymer matrix. The nanocomposites prepared in this work showed notably enhanced energy storage density. The maximum storage energy density of the nanocomposite with 50 vol% BaTiO 3 increased to 21.1 J/cm 3 at 150 kV/mm. These results indicate that paraffin is an effective modifier to prepare high energy storage density capacitor.
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
COMPOSITES SCIENCE AND TECHNOLOGY
·
2022
·
IF 9.879
Chao-Hua Xue,Ren-Xuan Wei,Xiao-Jing Guo,Bing-Ying Liu,Mi-Mi Du,Meng-Chen Huang,Hui-Gui Li,Shun-Tian Jia
Daytime radiative cooling that cools down an object by reflecting solar light and radiating heat simultaneously is expected to be a promising technology for dissipating heat without any energy consumption. However, radiative cooling materials’ solar reflection and infrared emissivity will be affected by the rain or dust pollution, therefore reducing the cooling performance under outdoor environments. A superhydrophobic radiative cooling composite film with hydrophobic SiO 2 embedded in poly(vinylidene fluoride-co-hexafluoropropene) was proposed via phase separation technology. The SiO 2 particles not only imparted to the film porous micro-nano tier rough structure to enhance the surface hydrophobicity , but also improved the mid-infrared emissivity of the film. As a consequence, the as-prepared film achieved 10.3 °C cooling under direct sunlight with convective heat reduced by transparent polyethylene film, and excellent superhydrophobicity with water contact angle greater than 160° and sliding angle close to 0°. Moreover, the cooling performance and superhydrophobicity of the film changed little after immersion in different pH solution and long-time exposure to UV irradiation. Importantly, the obtained film demonstrated great self-cleaning property making it hardly to be contaminated in outdoor environments, which is significant for sustainable applications.
研究领域:
材料科学
·
环境科学
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产品关联
DOI
高影响因子
Nature Communications
·
2025
·Vol. 16
·期 1
·1-10
·
IF 15.7
Xing Kun,Hao Yanan,Wang Xin-Jie,Huang Lei,Gao Yi,Liang Tong,Meng Yan,Bi Ke,Zhong Shao-Long,Dang Zhi-Min
Maintaining high charge/discharge efficiency while enhancing discharged energy density is crucial for energy storage dielectric films applied in electrostatic capacitors. Here, a nano-submicron structural film comprising ferroelectric material P(VDF-HFP) and linear dielectric material PMMA has been flexibly designed via the electrospinning process. Nano-submicron structure enables the film to maximize the ferroelectric material component and obtain improved dielectric performance without sacrificing breakdown strength and charge/discharge efficiency. As a result, the 40%-420 nm PMMA-P(VDF-HFP)@PMMA sample achieved an discharged energy density of 13.72 J/cm³ at a field of 740 kV/mm, with an impressive charge/discharge efficiency of 80%. This work presents a composite dielectric film that excels in breakdown strength, discharged energy density, and charge/discharge efficiency, offering a strategy for designing reliable, industrial-grade energy storage dielectrics.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2019
·
IF 3.131
Yongchang Jiang,Jiabang Wang,Qilong Zhang,Hui Yang,Da Shen,Fuming Zhou
Dielectric polymer nanocomposites have been attracting increasing attention because of their wide range of applications in electronics industry. To improve their dielectric properties , incorporating conductive fillers and ceramic fillers into the polymer matrix is considered to be an effective solution. Here, Ni nanoparticles (about 50–90 nm) were decorated onto the surface of polydopamine (PDA) coated BaTiO 3 nanowires to synthesize Ni@polydopamine@BaTiO 3 nanowires (Ni@PDA@BT NWs, also denoted as NPB) with different Ni loading amount. The nanowires were then added into poly(vinylidene fluoride-co-hexafluoropropylene) (P(VDF-HFP)) matrix and composite films were prepared. The dielectric performance of composite films is largely enhanced owing to the microcapacitor effect and interfacial polarization effect induced by Ni nanoparticles. This enhancement can be improved by increasing the loading amount of Ni. Crystallization behavior of the films were also investigated. With 20 vol% of Ni@PDA@BT NWs added, the dielectric constant of the composite film reaches 48.4 at 1 kHz, in contrast to 29.5 for 20 vol% of BT and 10.6 for pristine P(VDF-HFP). And the dielectric loss tangent remains at a low level of 0.23 at 1 kHz. These composite films exhibit potential for applications in flexible electronic devices and electrical systems.
研究领域:
材料科学
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电子工程
✓ 已验证
产品关联
DOI
高影响因子
Materials
·
2024
·Vol. 17
·期 20
·5083
·
IF 3.1
Wen Huang,Caiyuan Liu,Xin Fang,Hui Peng,Yonggang Yang,Yi Li
This work presents a facile way to fabricate a polymer/ceramics composite gel electrolyte to improve the overall properties of lithium-ion batteries. Lithium salt-grafted silica was synthesized and mixed with P(VDF-HFP) to produce a nanofiber film by the electrostatic spinning method. After coating a layer of SiO2onto the surface of nanofibers through a sol-gel method, a composite nanofiber film was obtained. It was then immersed in plasticizer until saturation to make a composite gel electrolyte film. Electrochemical test results showed that the obtained gel electrolyte film shows high thermal stability (~450 °C), high ionic conductivity of 1.3 × 10−3S cm−1at 25 °C and a lithium-ion transference number of 0.58, and superior cycling stability, providing a new direction for manufacturing secondary batteries with higher safety and performance.
研究领域:
材料科学
·
能源技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 73
·69580-69585
·
IF 3.289
Xingrong Xiao,Nuoxin Xu,Yongchang Jiang,Qilong Zhang,Enjie Yu,Hui Yang
Ag-loaded TiO2 hybrid particles (TiO2@Ag) were synthesized as fillers by using an ethylene glycol reduction method. Based on this, the TiO2@Ag/P(VDF-HFP) hybrid films were prepared by embedding TiO2 nanoparticles in a poly(vinylidene fluoride-co-hexafluoropropylene) [P(VDF-HFP)] matrix. Morphology and thermal analysis show that the introduction of TiO2@Ag does not disrupt the continuity of the polymer matrix, while the strong interaction between fillers and matrix influences the crystallization process of the composite. The adhesion of Ag to TiO2 efficiently separates the Ag particles from connecting and suppresses the formation of a conductive network, and the ultra-small Ag nanoparticles “trap” the carriers due to coulombic blockade and quantum confinement effect, which results in low dielectric loss and electrical conductivity of the composites. As a consequence, the dielectric permittivity of polymer nanocomposites was enhanced by 300% over the P(VDF-HFP) matrix at a filler content of 30 vol% while maintaining a rather low dielectric loss (0.037 at 1 kHz), demonstrating promising applications in electronic devices.
研究领域:
材料科学
·
电子工程
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Zhibiao Zhu,Yafei Hou,Tingyu Fu,Jing Cuan,Weiping Li
Given its wide application ranges, dielectric capacitors have garnered extensive attentions. However, due to the excessive premature agglomeration of free electrons, capacitors with nanocomposites as dielectrics fail to attain high breakdown strength ( E b ), and thereby constrain their ability to achieve superior energy storage performances. To alleviate the effects of free electrons and secondary impact-ionized electrons (SIE) on E b and leakage currents, here, a novel organic-inorganic core–shell Ni(OH) 2 @PDI (N@P) nanofiller with opposite double-PN-junction was well-designed and successfully synthesized by coating p-typed Ni(OH) 2 nanosheets with n-typed perylene diimide (PDI). It could reduce free electron kinetic energy and mitigate SIE amounts regardless of the applied electric field direction. Furthermore, PDI, as an organic compound, can uniformly and densely coat onto surfaces of 2D Ni(OH) 2 , as well as enhance compatibilities between Ni(OH) 2 and matrix, and thereby reducing structure defects at their interfaces. Last but not the least, Ni(OH) 2 nanosheets also contribute to E b improvement via acting as scattering centers. Experimental and simulation results concurrently affirmed positive influences of organic-inorganic N@P nanofillers on discharge energy density ( U d ) and efficiency ( η ) of P(VDF-HFP)-based (PVH-based) nanocomposites. Remarkably, 1.3 vol% N@P/PVH achieves a high U d of 21.7 J/cm 3 and η of 81.2 % under 569.0 MV/m. More importantly, it maintains an excellent energy storage performance throughout 10 4 cyclic tests. This study presents a valid strategy for concurrently improving U d and η of polymer-based nanocomposites.
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2016
·
IF 3.014
Qiao Huang,Hang Luo,Chao Chen,Xuefan Zhou,Kechao Zhou,Dou Zhang
Dielectric capacitors are of urgently demand in modern micro-electric industry. The surface modified inorganic filler introduced to polymer matrix represents a promising avenue for the dielectric material's enhancement of energy storage density. To ease the electric field concentration of the composite induced by permittivity difference between ceramic fillers and polymer matrix, the specific dielectric fillers of TiO 2 nanowires modified BT particles were synthesized in this study. Gradient dielectric composite consisting of poly(vinylidene fluoride-co-hexafluoropylene) [P(VDF-HFP)] matrix ( ε r ∼10), TiO 2 shell ( ε r ∼40), and BaTiO 3 (BT) core ( ε r ∼1000) were focused to investigate the electric field contribution and interface polarization. The results revealed that the permittivity of the composites increased as a result of large interfacial polarization induced by the large specific surface area of the nanowires as compared to the composite with randomly mixed TiO 2 /BT fillers. The breakdown strength of the composite was slightly improved with 20 vol% fillers, attributed to the fact that the electric field intensification was weakened by the BT@TiO 2 /Dop gradient dielectric fillers. The composite could endure up to 10 6 times of field cycling at the applied cycling field and the leakage current density was rather low. The composites with 20 vol% fillers exhibited a discharged energy density of 2.8 J/cm 3 at a low electric field, which was much higher than that of the neat P(VDF-HFP). The findings of this research introduced a new inorganic particle with large specific surface area and gradient dielectric permittivity as filler in composite for energy storage application.
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
POLYMER COMPOSITES
·
2026
·
IF 4.9
Wencong Tang,Yuxiang Lin,Minmin Mao,Kaixin Song
Dielectric polymer nanocomposites with low ceramic filler loadings are generally regarded as beneficial for suppressing conduction loss and enhancing breakdown strength. However, this conventional assumption overlooks the critical role of filler spatial distribution in governing microscopic electric field uniformity. In this work, 0.6(0.82Bi 0.5 Na 0.5 TiO 3 -0.18Bi 0.5 K 0.5 TiO 3 )-0.4SrTiO 3 (BNKT-ST) lead-free ceramics were synthesized and surface-modified with the silane coupling agent γ-aminopropyltriethoxysilane (KH550). The modified nanoparticles were then incorporated into a poly(vinylidene fluoride-co-hexafluoropropylene) (P(VDF-HFP)) matrix to fabricate a series of dielectric nanocomposite films with systematically varied filler contents (0.5–3 wt%). X-ray diffraction (XRD) and Fourier transform infrared (FTIR) confirmed the target perovskite phase of BNKT-ST and the coexistence of α and β phases in the polymer matrix. By combining quantitative image-based analysis of filler dispersion and microscopic electric field simulations, the spatial distribution of KH550@BNKT-ST nanoparticles in the P(VDF-HFP) matrix was systematically clarified: at excessively low filler loadings (≤ 1 wt%), nanoparticles were sparsely and unevenly dispersed; at a critical filler concentration of ~1 wt%, a continuous and spatially uniform insulating network was formed by the nanoparticles; while at higher filler loadings (> 1 wt%), slight agglomeration of nanoparticles occurred. A nonmonotonic dependence of breakdown strength on filler concentration was revealed. The continuous network at ~1 wt% effectively homogenized the local electric field, maximizing breakdown strength at 440 MV/m and an energy density of 8.97 J/cm 3 . This study demonstrates that low ceramic filler content does not inherently guarantee superior dielectric performance, and highlights the necessity of a critical filler threshold for achieving electric field homogenization in polymer-based dielectric nanocomposites. Highlights A nonmonotonic effect of filler content on breakdown strength is discovered. Quantitative analysis of filler dispersion is conducted to explain the mechanism. The underlying mechanism is revealed via phase-field simulation/analysis. The 1 wt% BNKT-ST/P(VDF-HFP) nanocomposite shows superior performance. This work provides guidance for designing high-energy-density dielectrics.
✓ 已验证
DOI
高影响因子
CHEMICAL PAPERS
·
2025
·
IF 2.5
Gu Peng
Dielectric composites with high dielectric constant, minimal dielectric loss and low conductivity can well serve for energy storage capacitors. High dielectric loss is not favorable due to large energy waste. Here, to improve dielectric constant of poly(vinylidene fluoride–hexafluoropropylene) by electric percolation, semiconducting NiO filler was added to form composites. However, high leakage current from interfaces can lead to high dielectric loss. Doping insulating α-Al 2 O 3 particles with stable structure, low chemical activity and high modulus into above binary composites can reduce dielectric loss. By changing NiO dose, dielectric constant was well tailored. Dose of α-Al 2 O 3 was left unchanged. Dielectric loss, conductivity and dielectric constant of composites were measured. By the same NiO loading, dielectric loss, conductivity and dielectric constant in ternary composites can be reduced, compared with binary composites. The optimal ternary composite should contain 35 wt% NiO and 4 wt% α-Al 2 O 3 . Optimized dielectric traits of this composite can be reflected by dielectric constant of ~ 64 and dielectric loss of ~ 0.27 under 100 Hz electric field.
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Jing Wang,Zhong Yang,Jianyong Jiang,Chaoyong Deng,Kongjun Zhu
Flexible dielectric materials with benign energy storage performance are highly desirable for the miniaturization, portability and integration of modern electronics. However, the limited energy storage density seriously restricts their practical applications. Herein, multilayered composite films composed of the P(VDF-HFP) matrix and Nd doped BaTiO 3 nanofibers with various filling ratios, layer numbers and topological structures were systematically designed and constructed via the layer-by-layer non-equilibrium process. The 3-layered composite films (3.0 wt% filling ratio) with the pure P(VDF-HFP) layer adjacent to the electrodes revealed good mechanical behavior, greatly enhanced captured ions at interfacial regions and suppressed injected charges from electrodes, which facilitated the improvement of the breakdown strength and discharged energy density. And a maximum U e of 25.5 J/cm 3 with a E b of 719.9 MV/m was achieved, which was not only 1.4 times more than the pure P(VDF-HFP) via the same process, but also behaved better than counterparts with the similar filling ratios and was among the top U e values of related P(VDF-HFP)-based nanocomposites.
研究领域:
材料科学
·
介电材料
·
能量存储
·
纳米复合材料
·
聚合物基复合材料
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）