HIGH PERFORMANCE POLYMERS
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2021
·
IF 2.161
Guangyu Duan,Fengying Hu,Zhongyuan Xin,Changlong Chi,Xiang Yu
This study reports that a novel high-temperature poly (m-phenyleneisophthalamide) (PMIA) composite with enhanced dielectric constant and thermal conductivity was prepared by filling with BaTiO3 nanowires–carbon nanotubes (BTCNs) fillers. Due to effective functionalization of BaTiO3 nanowires (BTNWs) and multi-wall carbon nanotubes (MWCNTs), the fabricated BTCNs fillers were homogeneously dispersed in PMIA matrix. The consequence displays that the dielectric constant of PMIA composite with 15 wt % BTNWs fillers increases to 27.6 at 103 Hz, which is about nine times higher than that of pure PMIA. Moreover, owing to the high thermal conductivity of MWCNTs, the thermal conductivity of PMIA with 15 wt% BTNWs fillers increases to 1.01 W/(mK). The enhanced thermal conductivity is beneficial for BTCNs/PMIA composite to dissipate the generated heat by dielectric loss. Considering these merits, this research would provide new methods and ideas for preparation of high-temperature dielectric polymer composites and reducing the internal thermal effect.
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2014
·Vol. 3
·期 6
·1250-1260
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IF 0
Y. Feng,W. L. Li,Y. F. Hou,Y. Yu,W. P. Cao,T. D. Zhang,W. D. Fei
Polymer based composites with high dielectric constant were successfully fabricated using BaTiO3 nanowires with high aspect ratio as inorganic filler and PVDF-HFP as polymer matrix. PVDF-HFP/BaTiO3 nanoparticles composites were also prepared as a contrast. The BaTiO3 nanowires were synthesized via one-step hydrothermal method. The BaTiO3 nanowires and its two types of composites were characterized by X-ray diffraction, Fourier transform infrared spectroscopy, scanning electron microscopy and transmission electron microscopy. For the composites, breakdown strength measurements, tensile tests and broadband dielectric spectroscopy analyses were also carried out. The results show that the two types of fillers are homogeneously dispersed in the matrix. The dielectric constant of composites filled by BaTiO3 nanowires is larger than that filled by BaTiO3 nanoparticles at the same content. Stronger interfacial polarization was found in PVDF-HFP/BaTiO3 nanowire composites. Two theoretical models were employed to predict the dielectric constants of composites, and the experimental data were consistent with the estimated trend. The enhanced dielectric properties of PVDF-HFP/BaTiO3 nanowire composites are attributed to the superior interfacial polarization and high aspect ratio of BaTiO3 nanowires.
研究领域:
材料科学
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电气工程
✓ 已验证
产品关联
DOI
CERAMICS INTERNATIONAL
·
2015
·
IF 2.605
M. Wang,W.L. Li,Y. Feng,Y.F. Hou,T.D. Zhang,W.D. Fei,J.H. Yin
BaTiO 3 nanowires/polyimide (BT-NWs/PI) and BaTiO 3 nanoparticles/polyimide (BT-NPs/PI) composites with low volume (≤10vol%) fraction of ceramic fillers were successfully prepared by in-situ dispersive polymerization. The BT-NWs were synthesized by a simple one-step hydrothermal method . The microstructure, dielectric properties , and energy storage density of the composites were studied. It was found that the two types of fillers were dispersed homogeneously in the PI matrix. Compared with BT-NPs/PI composites, the dielectric constant of composites filled by BT-NWs was larger at the same concentration. Stronger interfacial polarization mainly determined the dielectric properties that we observed on BT-NWs/PI composites. Furthermore, the energy storage density of the composites was significantly enhanced by BT-NWs, and energy storage density of 1.06 J/cm 3 was obtained under an electric field of 2200 kV/cm with the BT-NWs content of 2 vol%, which was 37% larger than that of the pure PI. The results indicate that the introduced wire-like ceramic fillers contribute to the enhancement of the dielectric properties and energy storage density of the composites.
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
ACS Applied Materials & Interfaces
·
2018
·
IF 8.097
Jiang Wu,Ni Qin,Baowei Yuan,Enzhu Lin,Dinghua Bao
A novel catalytic effect of pyroelectric materials induced by a change in temperature, namely pyroelectric catalysis, was found to be attractive due to its ability to utilize waste heat in pollution treatment. In this work, the pyroelectric catalytic properties of BaTiO3 (BTO) nanowires synthesized by a template hydrothermal method have been thoroughly investigated. The nanowires with an elongated polar axis show a superior pyroelectric catalytic performance in comparison with the equiaxial nanoparticles. Our numerical simulation results with a finite element method indicate that the enhanced catalytic efficiency of BTO nanowires can be attributed to the higher pyroelectric potential. On the basis of the pyroelectric effect and our experimental results, a pyroelectric catalytic degradation mechanism has been proposed by taking into account the migration of charge carriers and the formation of reaction radicals. This study for enhancing the pyroelectric catalytic activity by using BTO nanowires may provide a facile, promising, and new reusable strategy for the catalytic degradation of organic dye pollutant by means of temperature variation. It is hoped that the present work gives a clear understanding of the mechanism of pyroelectric catalysis.
研究领域:
材料科学
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环境科学
·
催化化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nano Energy
·
2017
·
IF 12.343
Jiang Wu,Ni Qin,Dinghua Bao
Piezocatalysis is a catalytic effect driven by the stress-induced electricity of piezoelectric crystallites . In this study, piezoelectric BaTiO 3 nanowires and nanoparticles were synthesized and their piezocatalytic activity was investigated. The BaTiO 3 nanowires exhibit effectively enhanced piezocatalytic activity under ultrasonic vibration compared with the BaTiO 3 nanoparticles. On the basis of the piezoelectric potential analysis by finite element method simulation for BaTiO 3 nanowires and nanoparticles under ultrasonic vibration, the enhanced piezocatalytic activity of the BaTiO 3 nanowires can be attributed to the larger piezoelectric potential along the polar axis. In addition, we also demonstrate that the intrinsic charge carriers (not piezoelectric charges) in piezoelectric crystallites play the role of charge transfer in the catalysis process through regulating the concentration of charge carriers. Our work provides further understanding of piezocatalysis of piezoelectric nanomaterials as well as insights on the relationship between piezoelectric potential and piezocatalysis.
研究领域:
材料科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
Nano Energy
·
2020
·
IF 16.602
Kunming Shi,Bin Chai,Haiyang Zou,Peiyue Shen,Bin Sun,Pingkai Jiang,Zhiwen Shi,Xingyi Huang
Nanocomposites consisting of a flexible piezoelectric polymer and a reinforcing phase have shown great potential for constructing high-performance piezoelectric nanogenerators (PENGs). However, the weak interface and poor dispersion of piezoelectric reinforcing phase significantly impair the electromechanical properties (e.g. , effective stress/strain, piezoelectric coefficients) of the nanocomposites, thus severely restricting the performance enhancement of the PENGs. In this study, we hydrothermally synthesized the piezoelectric reinforcing phase of BaTiO 3 nanowires , and grafted a layer of high-modulus polymethyl methacrylate (PMMA) onto the nanowire surface via surface-initiated polymerization. The PMMA coating layer forms a strong interface between BaTiO 3 nanowires and the polymer matrix [i.e ., poly(vinylidenefluoride-co-trifluoroethylene)], which efficiently improves dispersion of the BaTiO 3 nanowires and stress transfer at the interface, therefore resulting in an enhanced output performance in the fibrous nanocomposite PENGs. The output voltage and current of the PMMA encapsulated BaTiO 3 (PMMA@BaTiO 3 ) nanowires-based PENG can reach to 12.6 V and 1.30 μA, with a maximum output power of 4.25 μW, which is 2.2 times and 7.6 times higher than the PENG with unmodified BaTiO 3 nanowires and the PENG without BaTiO 3 nanowires, respectively. Furthermore, the flexible PENG exhibits great stability that could continuously generate stable electrical pulses for 6000 cycles without any decline. This study provides a feasible approach of interface tailoring for achieving high-performance piezoelectric nanocomposite and shows the promising potential of the fibrous nanocomposites in biomechanical energy harvesters and smart wearable sensors.
研究领域:
材料科学
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纳米技术
·
能源工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materiomics
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2020
·
IF 5.797
Xiaofang Liu,Longyin Xiao,Yong Zhang,Huajun Sun
Over the last several years, piezo-photocatalytic effect was intensively investigated for a facile, effective and promising protocol to sewage treatment and environmental remediation. The research on the integration of piezocatalytic and photocatalytic process on lead-free ferroelectric materials is highly demanded to further push this field forward. In this work, BaTiO 3 nanowires (BT NWs) were fabricated by a two-step hydrothermal method. The degradation of organic dye (methyl orange, MO) aqueous solution (5 mg L −1 ) by integrating photocatalysis with the piezoelectric-like effect under UV light radiation and ultrasonic vibration was investigated. The decomposition ratio reaches up to ∼98.17% (at 80 min), which is around 1.28 and 2.24 times of the sole piezocatalysis and photocatalysis process, respectively. The intermediate product of hydroxyl radical (•OH) and superoxide radical (•O 2 − ) was detected and quantified by radical trapping experiments, to illustrating their key role in degrading MO molecules. In addition, we carried out sequential cycles to evaluate the cycling stability and usage durability of catalysts and a reduction of ∼15% in the efficiency was observed after four cycles. This work provides a promising paradigm for the further development of piezo-photocatalytic materials and target applications in environmental field.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2017
·Vol. 5
·期 13
·6070-6078
·
IF 8.867
Bing Xie,Haibo Zhang,Qi Zhang,Jiadong Zang,Chao Yang,Qingping Wang,Ming-Yu Li,Shenglin Jiang
In practical application, new dielectric capacitors with greater energy density at lower operating voltage will be promising candidates for high-performance electrical devices. Theoretically, it is possible to achieve large electric polarization at a low electric field via embedding aligned ferroelectric nanowires in a polymer matrix, which could release high energy density. However, in terms of practice, the design of nanocomposites with aligned nanowires poses a great technical challenge. Here, a new physical-assisted casting method was developed to tune the orientation of elongated BaTiO3 nanowires in a P(VDF-CTFE) matrix. In the Z-aligned nanocomposites, a large (Dmax − Pr) value of 9.93 μC cm−2 can be induced at a low electric field of 2400 kV cm−1 by aligning 3 vol% ferroelectric BaTiO3 nanowires in the poling direction. Compared with X–Y-aligned nanocomposites even at a high electric field of 3400 kV cm−1, the Z-aligned nanocomposites could exhibit simultaneously an enhanced energy density of 10.8 J cm−3 and a discharge efficiency of 61.4% at 2400 kV cm−1. To the best of our knowledge, among ferroelectric nanocomposites, this is the highest energy density ever obtained at such a low electric field. This work is of critical significance in making dielectric nanocomposites viable for energy storage devices in current electrical and electronic applications.
研究领域:
材料科学
·
电气工程
·
纳米技术
✓ 已验证
DOI
高影响因子
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