APPLIED SURFACE SCIENCE
·
2018
·
IF 4.439
Jian Wang,Yunchuan Xie,Jingjing Liu,Zhicheng Zhang,Yanfeng Zhang
Poly(vinylidene fluoride) (PVDF) based polymer/ceramic nanocomposites for high energy density dielectrics have long been plagued by their low discharging efficiency (40–60%), which originates from the matrix with high bulk ferroelectric relaxation and the high-k ceramics with large conduction loss. In this work, a linear-like PVDF-based polymer dielectric is synthesized through grafting poly(methyl methacrylate) (PMMA) onto main chains of poly(vinyl fluoride-trifluoroethylene-chlorotrifluoroethylene) (P(VDF-TrFE-CTFE)) terpolymer via an atom transfer radical polymerization (ATRP) process. PMMA grafted terpolymer (P(VDF-TrFE-CTFE)-g-PMMA) shows linear-like dielectric characteristics accompanied with greatly enhanced discharging efficiency of ∼80% under 250 MV/m, which is over 100% higher than that of pristine terpolymer. To further improve its breakdown strength and discharging efficiency, the grafted terpolymer are then compounded with ultrasonic-exfoliated mica nanosheets ( e Mica) by solution-cast method. Thanks to the low hysteresis loss of linear-like dielectric matrix and the high insulating 2D mica nanosheets, the composite with the highest discharging efficiency of ∼78% under 250 MV/m is achieved. The maximum energy density of the optimized composite reaches 9.6 J/cm 3 , which is nearly 290% that of the pristine terpolymer. Besides, its discharging efficiency is about 74% under 450 MV/m, which is much more advantageous than the other PVDF-based polymer/ceramics composite dielectrics. This work suggests that utilizing polymer matrix with linear dielectric property and fillers with high insulating 2D structure might be a facile strategy to achieve composite dielectrics with simultaneously high energy density and high discharging efficiency.
研究领域:
材料科学
·
电气工程
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2020
·
IF 6.551
Rong-Rong Cai,Shu-Zheng Li,Li-Zhi Zhang,Yang Lei
Airborne particulate matter (PM) pollution has raised serious concerns over both the global climate and public health. Therefore, there is an urgent need for air filters of high-efficiency and energy-saving. Pore structure optimization and electret enhancement are feasible means to improve their filtration performance. Herein, a novel sandwich-structured electret composite filter with a low pressure drop and robust filtration stability was successfully designed and fabricated. The composite filter was composed of fluffy PS microfibers with large electric resistivity and high porosity, and PAN nanofibers with high polarity and small pore size. Benefiting from the fluffy structure constructed by electrospinning at the right humidity, the tortuous pore channels created by the appropriate mixing of microfibers and nanofibers, and the abundant static charges generated by the hybrid of polar and nonpolar polymer materials, the PS/PAN/PS composite filter possessed a high filtration efficiency of 99.96% for particles of 0.30 μm, a low pressure drop of 54 Pa and a satisfactory quality factor value of 0.1449 Pa −1 at an airflow velocity of 5.3 cm/s. In particular, the composite filter exhibited better electret stability and PM 2.5 loading performance than the commercial ones, which guarantees its long-term storage and usage.
研究领域:
环境科学
·
材料科学
·
纳米技术
·
空气净化技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Energy Materials
·
2024
·
IF 5.4
Huan Liu,Ziyue Wang,Yicheng Peng,Jiyang Xie,Wanbiao Hu
Introducing high dielectric-constant inorganic fillers into a high-broaden-strength polymer matrix is a crucial strategy to achieve a high-performance energy storage polymer composite. However, the interfacial coupling between the inorganic fillers and polymer matrix has always been a predicament for optimal performance. Herein, a multilayer interface structure, i.e., TiO2/SiO2, SiO2/polydopamine (PDA), and PDA/PVDF, are developed to resist the applied high electric field and improve the interfacial polarization simultaneously. TiO2 nanorods (NRs) with [001]-oriented rutile polymorph are synthesized by sodium dodecyl sulfate (SDS) assisted hydrothermal reaction, which is further decorated with a SiO2 layer and a subsequent PDA layer in order to incorporate well into the PVDF matrix using a solution casting process, finally forming the TiO2@SiO2@PDA/PVDF composite film. The optimal composite film incorporating [001]-TiO2 NRs exhibits an ultrahigh energy density (Ue) of 29.8 J/cm3 at a high Eb of 532 MV/m, sharply superior to the TiO2 counterpart-based films (e.g., TiO2 nanoparticle (NPs) based, and with or without the SiO2/PDA layer, which only gives a maximum Ue of 16 J/cm3 in TiO2@SiO2@PDA NPs/PVDF), and also the similarly inorganic-polymer systems previously reported. This work not only demonstrates an inorganic-polymer hybrid composite film with high electrostatic storage density but also highlights a multilayer interface structure route to alter interfacial microstructures and achieve superior energy storage performance.
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
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Yue Jia,Han Zhang,Huiyan Zhou,Yan Wang,Caiming Wang,Mengchen Yang,Chunxue Zhai,Xiaofei Qi,Dengwei Hu,Lili Zhao,Bin Cui
Flexible dielectrics play a crucial role in the advancement of capacitors. However, their limited energy storage density is an obstacle to both their application scope and miniaturization efforts. Inspired by an “egg effect”, this study introduces an innovative egg-like ceramic filler, namely Ba 0.34 Sr 0.51 Ca 0.15 Zr 0.1 Ti 0.9 O 3 -Y@Ba 0.34 Sr 0.51 Ca 0.15 Zr 0.1 Ti 0.9 O 3 -Mn@ZrO 2 (BSCZT-Y@BSCZT-Mn@ZrO 2 ), which is developed via a core–shell doping process. The separation of electrons and holes in the “egg yolk” (donor-rich core) and “egg white” (acceptor-rich shell) coupled with the current-limiting “eggshell” (wide bandgap oxide) in the ceramic fillers, resulting in a large effective polarization Δ P , a higher dielectric permittivity ε r , a lower tan δ , and a significant increase in the discharged energy storage density W rec of the composites. Together with the phase transition from α-PVDF to β-PVDF caused by the electrostatic interaction between fillers and PVDF, an ultra-high W rec of 33.2 J/cm 3 is achieved in the BSCZT-Y@BSCZT-Mn3@ZrO 2 /PVDF, which has the Δ P of 28.5 μC/cm 2 at 296.7 MV/m, along with ε r of 21.7 and tan δ of 0.018 at 1 kHz. Significantly, the composite film exhibits outstanding bending endurance. Even after 600 full bends, over 92 % of the capacitance retention rate can be retained. This research highlights the potential of ceramic filler structural design for flexible capacitors in low-power flexible electronics.
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
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2023
·Vol. 107
·期 1
·205-213
·
IF 3.9
Shenghao Wang,Hongbo Liu,Yuanyuan Wang,Hailan Qin,Jianwei Zhao,Zhilun Lu,Zhu Mao,Dawei Wang
BiFeO 3 –SrTiO 3 (BF–ST) ceramics have been considered a novel class of lead-free dielectric materials exhibiting notable dielectric constants and remarkable thermal stability. In this work, we fabricated a series of (1 − x )BF– x ST (0.32 ≤ x ≤ 0.44) ceramics near the morphotropic phase boundary and comprehensively investigated their microstructure and electrical properties, which seeks to optimize the piezoelectric performance. As the ST content increases, a gradual reduction in the rhombohedral phase fraction is observed alongside a corresponding increase in the cubic phase fraction. Although x = 0.38, the maximum grain size of 5.66 μm is obtained, accompanied by a distinctive heterogeneous core–shell microstructure, which demonstrates a high remanent polarization of 51.2 μC/cm 2 and a maximum d 33 value of 72 pC/N. Furthermore, impedance spectroscopy analysis reveals the formation of a conductive core and a nonconductive shell within the sample. These findings highlight the potential of optimized BF–ST ceramics as promising alternatives to lead-based piezoelectric materials, offering exceptional ferroelectric and piezoelectric properties.
研究领域:
材料科学
·
物理学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2024
·Vol. 14
·期 4
·2410-2421
·
IF 3.9
Haixia Wu,Wang Shen,Quanfa Zhao,Weiwei Zhang
As a typical type of organic flocculant, chitosan is limited by its poor water solubility and narrow pH range application. Grafting modification can improve chitosan's solubility and availability through linking macromolecular chains with other types of water-soluble groups or functional side groups. In this study, dielectric barrier discharge (DBD) was used to active the surface of chitosan, then activated chitosan was polymerized with acrylamide to synthesize a chitosan-based flocculant, chitosan-acrylamide (CS-AM). During the synthesis of CS-AM, the optimal conditions were determined as follows: discharge time of 5 min, discharge power of 60 W, total monomer mass concentration of 80 g L−1, polymerization time of 3 h, polymerization temperature of 70 °C, and m(CS) : m(AM) ratio of 1 : 3. The structure and morphological characteristics of CS-AM were investigated and analyzed by Fourier transform infrared (FTIR) spectroscopy, X-ray photoelectron spectroscopy (XPS), thermogravimetric (TG) analysis, scanning electron microscopy (SEM), X-ray diffraction (XRD) and N2 physical adsorption, respectively. The removal efficiency of kaolin suspension and CNTs suspension can reach up to 95.9% and 90.2% after flocculation of CS-AM. Furthermore, the zeta potential of the supernatant from the CS-AM treated kaolin suspension at different pH values was examined, and the flocculation mechanism of CS-AM was analyzed. This study provides new ideas for the preparation and development of modified chitosan and broadens its application in water treatment.
研究领域:
环境科学
·
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2013
·
IF 1.789
Mingye Ding,Chunhua Lu,Qiaoqiao Cui,Yaru Ni,Zhongzi Xu
Glasses within the B 2 O 3 –Al 2 O 3 –Na 2 O system were examined as potential replacements for PbO-based glass frits with low firing temperature (500–600 °C) for transparent dielectric layer of plasma display panel (PDP). The glasses were evaluated for glass transition ( T g ), softening temperature ( T f ), thermal coefficient of expansion ( α ) and dielectric constant ( ε ). The dielectric constant of these glasses was also compared with theoretical data calculated by Appen and Bresker's equation. T g of the glasses varied between 330 and 460 °C and T f was in the region of 350–500 °C. The thermal coefficient of expansion ranged from 7×10 −6 to 10×10 −6 K −1 . The dielectric constant of these glasses was 6–8 within the region of the theoretical value. The T g , T f , α , ε of the selected glass, which was used to prepare transparent dielectric layer in 20 μm thickness, were found to be 449 °C, 476 °C, 8.284×10 −6 /k, 6.84, respectively. All the results suggest that B 2 O 3 –Al 2 O 3 –Na 2 O glasses would be suitable as a potential candidate for Pb-free dielectric layer in PDPs.
研究领域:
材料科学
·
电子工程
✓ 已验证
DOI
高影响因子
MACROMOLECULES
·
2021
·
IF 5.985
Haoran Xu,Guanghu He,Sheng Chen,Shaonan Chen,Rui Qiao,Hang Luo,Dou Zhang
Although polymer dielectrics show wide application prospects in electronic and electrical fields, a low relative dielectric constant and a low energy density restrict their rapid developments. To overcome these shortcomings, a strategy is proposed to facilitate orientational polarization through the incorporation of the π–π stacked biphenyl side groups in dipolar polymers. In this study, sulfonyl-containing poly(norbornene)s with and without biphenyl groups were synthesized by ring-opening metathesis polymerization, denoted as PBTMD-SO2 and PTMD-SO2, respectively. Their dielectric behaviors and energy-storage properties were investigated. The dielectric constant of PBTMD-SO2 with the biphenyl side groups was as high as 11.1 at 25 °C and 1 kHz, which was nearly 35% higher than that of PTMD-SO2 due to the stronger orientational polarization. In addition, the dielectric loss in the range of 1 kHz to 1 MHz increased from 0.061 to 0.172 for PTMD-SO2 and from 0.075 to 0.110 for PBTMD-SO2. Electric displacement–electric field loops studies indicated that the discharge energy density of PBTMD-SO2 reached 1.69 J/cm3 at 180 MV/m with a high efficiency of 87.1%, which exceeded the discharge energy density of 1.29 J/cm3 for PTMD-SO2 at 200 MV/m. This work offers a new idea for the design of high-performance dielectric polymers.
研究领域:
材料科学
·
电子工程
✓ 已验证
DOI
高影响因子
EUROPEAN POLYMER JOURNAL
·
2021
·
IF 4.598
Yang Zhang,Rui Feng,Zhuo Chen,Tingting Zhao,Yanyun Ju,Shengliao Yan,Shaokun Song,Guanghui Zhao,Lijie Dong
Polymer dielectrics have wide application in advanced electronic devices and pulsed power systems because of their easy processing, low cost, outstanding flexibility and high breakdown strength ( E b ). However, the low energy density ( U e ) of polymer dielectrics restricts the miniaturization and integration of dielectric capacitors. Herein, poly(1,4-anthraquinone) with rigid molecular chains was synthesized and introduced into poly(vinylidene fluoride) (PVDF). Benzene rings on the main chains and large steric hindrance in the side chains limit the intramolecular rotation and thus endow poly(1,4-anthraquinone) with rigid chain structure. Moreover, extended π system and delocalization of electrons minimize the energy of polymer chain, which gives poly(1,4-anthraquinone) more prominent durability and stability. The introduction of poly(1,4-anthraquinone) reduces the crystallite sizes of PVDF and strengthens Young’ modulus of the films. Consequently, both high E b and U e are achieved and increased by 170% and 62% compared with pristine PVDF, respectively. This research provides a new strategy to prepare PVDF-based dielectric film with superior energy storage performances.
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
ORGANIC ELECTRONICS
·
2019
·
IF 3.495
Jiawei Zou,Ting Xu,Jiufu Zhu,Zuosen Shi,Wei Wang,Zhanchen Cui
Here, we copolymerize a monomer containing naphthyl group with 2-hydroxyethyl methacrylate (HEMA) and glycidyl methacrylate (GlyMA) in various molar ratio to obtain copolymers as functional gate dielectric layers of thin-film transistors (TFTs). Using naphthyl-containing molecule to have similar chemical structure with pentance to adjust the grain size of semiconductor. The results indicated that the semiconductor grains size decreased as molar percentage of naphthyl-containing compound in the polymer structure increased, which could also affect the charge carrier mobility of the pentacene thin-film transistors (TFTs). Therefore, this can be a promising manner to fabricate pentacene TFTs with a high charge carrier mobility by using functionalized dielectric layers to obtain uniform grain size of the pentacene semiconductor.
研究领域:
材料科学
·
有机电子学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
·
2020
·Vol. 44
·期 14
·12169-12179
·
IF 3.741
Jianan Li,Xiujuan Lin,Guanliang Chen,Eugenie Uwiragiye,John G. Fisher,Shifeng Huang,Xin Cheng
Summary Dielectric composites are regarded as potential energy storage materials for electric power systems and advanced electronics because of the tunable permittivity, excellent flexibility, and high electric breakdown strengths. However, for the moment, it is still a challenge to fabricate dielectric composites combining large electrical breakdown strength and high discharged energy density. Ferroelectric (K 0.5 Na 0.5 )NbO 3 (KNN) particles are fabricated by solid-state reaction and introduced into poly(vinylidene fluoride) to improve energy storage capability. Particularly, the properties such as dielectric constant ( ε r ), electric displacement, breakdown strength ( E b ) and discharged energy density ( U dis ) are enhanced with the introduction of KNN particles. The composite containing 3 vol% KNN particles exhibits an ultrahigh U dis of 14.70 J·cm −3 at 480 kV·mm −1 , which is approximately three times that of pure PVDF of 4.80 J·cm −3 at the applied electric field of 350 kV·mm −1 . This research is of critical significance for proposing a convenient and effective way to design high discharged energy storage dielectric composites for future flexible portable capacitors. Keywords: dielectric composite, (K 0.5 Na 0.5 )NbO 3 particle, breakdown strength, discharged energy density.
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
Journal of Materials Chemistry A
·
2022
·Vol. 10
·期 28
·15183-15195
·
IF 14.511
Yanan Shang,Yu Feng,Changhai Zhang,Tiandong Zhang,Qingquan Lei,Qingguo Chi
Composites that possess ultrahigh breakdown strength together with a high dielectric constant have always been the pursuit of energy storage polymer-based dielectrics. However, the constrained relationship between them makes the uniformly filled composite dielectric to usually tend to improve the performance of one at the cost of the other, resulting in a serious restriction on the improvement of the energy storage performance. In this paper, the optimized blend is used as a polymer matrix, and two functional fillers with a two-dimensional structure are selected; one is utilized to enhance the polarization performance and the other is employed to boost the breakdown strength. For the prerequisite of keeping the nanofiller space content unchanged, two kinds of gradient structures are designed to explore the effect of two-dimensional filler concentration gradient distribution on the breakdown, dielectric along with the energy storage performance of the composite dielectric. Finally, a discharge energy density of 19.22 J cm−3 along with a charge–discharge efficiency of 75% were obtained for the composite with both fillers in positive gradient distribution. The stochastic breakdown simulation results also verify the helpful contribution of the gradient structure to breakdown strength, which confirms the effectiveness of the gradient structure. This paper offers a brand-new structural design philosophy for the research and development of energy storage composite dielectrics that have high insulation and polarization.
研究领域:
材料科学
·
能源技术
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）