RSC Advances
·
2017
·Vol. 7
·期 58
·36473-36481
·
IF 3.108
Lujun Yu,Yaofeng Zhu,Yaqin Fu
A rational structure design is always an attractive approach for high-performance microwave absorbers. Accordingly, flexible BaTiO3@Ni–P/polyvinylidene fluoride/polyaniline (BaTiO3@Ni–P/PVDF/PANI) composite films were fabricated by growing aligned PANI on the surface of a BaTiO3@Ni–P/PVDF composite film. Morphology and structure characterization showed that uniform core–shell BaTiO3@Ni–P microspheres and the unique conelike shapes of aligned PANI were innovatively fabricated. The effect of the special structure on microwave absorption properties was investigated within the 2–18 GHz frequency range. The prepared absorbents displayed exceptional microwave absorption performances. The minimum reflection of BaTiO3@Ni–P/PVDF/PANI reached −22.56 dB at 12.72 GHz with a thickness of 2 mm, and the bandwidth that corresponded to reflection loss below −10 dB reached 4.33 GHz (11.12–15.45 GHz). The possible absorption mechanism of BaTiO3@Ni–P/PVDF/PANI was also studied in detail. Results offer an effective means to develop microwave absorbers via rational microstructure design.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2018
·
IF 4.439
Penghao Hu,Zhuye Jia,Zhonghui Shen,Peng Wang,Xiaoru Liu
To realize application in high-capacity capacitors and portable electric devices, large energy density is eagerly desired for polymer-based nanocomposite. The core–shell structured nanofillers with inorganic buffer layer are recently supposed to be promising in improving the dielectric property of polymer nanocomposite. In this work, core–shell structured TO@BT nanoparticles with crystalline TiO 2 buffer layer coated on BaTiO 3 nanoparticle were fabricated via solution method and heat treatment. The thickness of the TO buffer layer can be tailored by modulating the additive amount of the titanate coupling agent in preparation process, and the apparent dielectric properties of nanocomposite are much related to the thickness of the TO layer. The relatively thin TO layer prefer to generate high polarization to increase dielectric constant while the relatively thick TO layer would rather to homogenize field to maintain breakdown strength. Simulation of electric field distribution in the interfacial region reveals the improving effect of the TO buffer layer on the dielectric properties of nanocomposite which accords with the experimental results well. The optimized nanoparticle TO@BT-2 with a mean thickness of 3–5 nm buffer layer of TO is effective in increasing both the ε and E b in the PVDF composite film. The maximal discharged energy density of 8.78 J/cm 3 with high energy efficiency above 0.6 is obtained in TO@BT-2/PVDF nanocomposite with 2.5 vol% loading close to the breakdown strength of 380 kV/mm. The present study demonstrates the approach to optimize the structure of core–shell nanoparticles by modulating buffer layer and provides a new way to further enlarge energy density in polymer nanocomposite.
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 Nanomaterials
·
2016
·
IF 1.758
Lujun Yu,Yaofeng Zhu,Chen Qian,Qiang Fu,Yongzhen Zhao,Yaqin Fu
The three-dimensional (3D) conductive network structures formed by barium titanate/carbon nanotubes incorporated polyaniline were favorable for strengthening electromagnetic absorption capability. Herein, an easy and flexible method consisting of sol-gel technique, in situ polymerization, and subsequent mechanical method have been developed to prepare the barium titanate/carbon nanotubes incorporated polyaniline (CNTs/BaTiO3/PANI or CBP) ternary composites. The dielectric properties and microwave absorption properties of CNTs/BaTiO3/PANI composites were investigated in the frequency range of 2–18 GHz by vector network analyzer. Interestingly, it is found that the CNTs/BaTiO3/PANI composites with 3D conductive network structures presented outstanding electromagnetic absorption properties, which may be attributed to the high impedance matching behavior and improved dielectric loss ability and novel synergistic effect. Additionally, it also can be supposed that the “geometrical effect” of composite was more beneficial to absorbing the incident electromagnetic wave. The CNTs/BaTiO3/PANI composite (the mass ratio of CNTs/BaTiO3 to PANI is 2 : 3) exhibits the best microwave absorption properties, of which the minimum reflection loss value can reach −30.9 dB at 8 GHz and the absorption bandwidth with a reflection loss blew −10 dB ranges from 7.5 to 10.2 GHz.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
FERROELECTRICS
·
2015
·
IF 0.469
Y Feng,W. L. Li,D. Xu,W.D. Fei
Ba(1-2x)LixAlxTiO3 (x = 0, 0.5, 1.5 and 2.5 mol%) ceramics were prepared by a conventional sintering method. The effects of Li+ and Al3+ content on the crystalline structure, dielectric and piezoelectric properties of BT ceramic were investigated. A better incorporation of Li+ and Al3+ ions recently occurs in our system without any impurity at x≤1.5 mol%. Ba(1-2x)LixAlxTiO3 ceramic can generate a large piezoelectric constant of d33 = 276 pC/N at x = 1.5 mol%. According to the dielectric properties results, the high piezoelectricity is possible from the suppressed energy barrier of second-like order transition induced by the incorporation of Li+ and Al3+ ions.
研究领域:
材料科学
·
物理学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2021
·
IF 5.302
Yuqian Wang,Qiuyu Cheng,Peng Jiang,Lin Liu,Kunyang Cui,Yong Li
Solid solutions based on BaAl 12- x M x O 19 (M = Co 2+ , Ni 2+ ) showing intense blue shades were successfully synthesized by conventional solid state reaction. Then, novel zirconia ceramic materials with intense blue hues were then prepared upon addition of 5 wt% of the synthesized chromophore to a ZrO 2 white matrix containing 5 wt% Y 2 O 3 and sintered at 1400 °C for 6 h. The colors of the BaAl 12- x Co x O 19 or BaAl 12- x Ni x O 19 are due to the d-d transitions of Co 2+ or Ni 2+ in tetrahedral coordination, respectively. The colored zirconia ceramics were all indexed with tetragonal phase. The coexistence of the chromophore and ZrO 2 were observed by scanning electron microscopy and energy dispersive spectrometer. The hardness of the as-synthesized blue zirconia ceramic was slightly higher as compared to the pure undoped sample.
研究领域:
材料科学
·
无机化学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Wenzhong Zou,Guoyun Zhou,Yan Hong,Wei He,Shouxu Wang,Yuanming Chen,Chong Wang,Yao Tang,Yukai Sun,Chaoying Ma
In this work, the high-yield synthesis of BaTi 2 O 5 (BT2) nanorods with a growth direction at [020] was achieved in the medium of KCl salt through the molten-salt synthesis (MSS) with Ba(NO 3 ) 2 and anatase TiO 2 as reactants. By optimizing the involved reaction factors including particle sizes, thermal holding durations and crystalline forms of TiO 2 , ultra-pure BT2 nanorods with uniform size were obtained after 45 min of heating at 950 °C. Meanwhile, anatase and rutile TiO 2 were respectively mixed and calcined in KCl to study the formation and transformation process of BT2 nanorods in detail. It was found that anatase TiO 2 tends to merge together and convert into rutile TiO 2 . In particular, the formed rutile TiO 2 reacts with BaO and BaTiO 3 to spontaneously form BT2 nanorods without any presence of rod-like templates. Besides, BT2 takes priority over K 2 Ti 6 O 13 to generate the corresponding nanorods in the molten salt with high content of K + . In addition, the O 2 in air also promotes the formation of nanorods. According to the experimental results, a probable mechanism for the initial formation, subsequent growth and transformation of BT2 nanorods was thus proposed, which helps to facilitate the preparation of BT2-based one-dimensional nanomaterials.
研究领域:
材料科学
·
无机化学
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS LETTERS
·
2023
·
IF 3
Huiling Guo,Xinyue Yang,Huajun Sun,Liang Li,Xiaofang Liu
The degradability and recycling of piezoelectric devices are of great practical importance. In this letter, we present a novel reusable device consisting of piezoelectric BaTiO 3 nanoparticles embedded in a degradable gelatin matrix. The device exhibits exceptional flexibility, a high output voltage of 3 V, and a maximum power density of 0.06 μW/cm 2 . Furthermore, the reconstruction experiment demonstrates the device’s remarkable stability and reliability, as evidenced by its minimal output voltage attenuation.
研究领域:
材料科学
·
能源技术
·
环境科学
✓ 已验证
DOI
高影响因子
JOURNAL OF MOLECULAR STRUCTURE
·
2023
·
IF 3.8
Shuo Shan,Jie Li,Xuan Zhao,Siwen Pi
M-type barium ferrite with the formula Ba 1− x Sm x Fe 12− y Nb y O 19 ( x = 0.00–0.10, y = 0.00–0.20), which was co-doped with Sm 3+ and Nb 5+ ions, was synthesized experimentally by a modified solid-phase reaction method. The crystal structure of samples was determined by X-ray diffraction, which confirmed that they were of high purity. The X-ray diffraction data were fitted with a full-spectrum correction using GSAS software. By Fourier transform infrared spectroscopy, the samples were observed to exhibit bands due to tetrahedral and octahedral sites at 598 cm −1 and 445 cm −1 , respectively. The samples were examined by field emission scanning electron microscopy, which showed that they partly comprised hexagonal structures but mostly consisted of irregular structures with rounded edges. Characterization of the elemental contents of the samples by energy-dispersive spectroscopy revealed an increase in the contents of Sm and Nb and a decrease in the contents of Ba and Fe. The magnetic properties of the samples were examined using a vibrating sample magnetometer. The results showed that the saturation magnetization and residual magnetization of the samples decreased slightly with an increase in the contents of the dopants. The coercivity reached its maximum value, namely, 3367.53 Oe, when x = 0.04 and y = 0.08.
研究领域:
材料科学
·
磁学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Licheng Wan,Jun Han,Wenrou Tian,Najun Li,Dongyun Chen,Jianmei Lu
Both large adsorption capacity and high catalytic activity play a key role in water purification via effective degradation of organic pollutants. Herein, a well-defined core–shell heterostructure (BTO@TD-COF) was fabricated by polycondensation of 1,3,5-tris(4-aminophenyl)benzene and 2,5-dimethoxyterephaldehyde on barium titanate (BTO) for effective adsorption that is followed by the piezo-photocatalytic degradation of bisphenol A in water. Under simultaneous ultrasound and visible-light irradiation, the separation of carriers is boosted by the built-in electric field generated in BTO, which endows BTO@TD-COF with outstanding piezo-photocatalytic activity. With the advantages of favorable catalytic and adsorption performance, Bisphenol A (5 ppm, 1000 mL) can be completely degraded within 75 min by BTO-3@TD-COF (25 mg), and the degradation rate is 31.9 and 2.5 times that of BTO and TD-COF, respectively. It provides an efficient strategy for cleaning of organic wastewater by piezo-photocatalysts combined with excellent adsorption capacity.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Gongwen Gan,Yaqin Yin,Zongliang Zheng,Yunjing Wang,Xi Zhang,Gaojie Zou,Zhongyin Zhu,Guoqing Gou
Two phase-based composites comprising barium titanate (BaTiO 3 ) and spinel magnesium ferrite (1- x )Mg 0.7 Cd 0.3 Fe 2 O 4 + x BaTiO 3 (x = 0.00, 0.03, 0.06, 0.09, and 0.12) were investigated. The phase structure revealed the coexistence of the perovskite BaTiO 3 and spinel MgFe 2 O 4 phases. The microstructural analysis indicated that the average crystallite size initially increased and then decreased, as the increase in x weakened magnetisation, decreased saturation magnetisation (from 47.5 to 35.9 emu/g) and coercivity (150–0 Oe) were obtained, resulting in reduced permeability at low frequency. The permittivity gradually increased owing to tuning by barium titanate, which has strong dielectric properties , promising a relatively large miniaturisation factor. Further, low magnetic loss (tan δ μ ∼10 −2 ) and dielectric loss (tan δ ε ∼ 10 −2 to 10 −3 ) guarantee high quality factor. The low losses and enhanced dielectric properties of the as-synthesised composites could be conducive to improving the behaviour of such magneto-dielectric composite systems in microwave applications.
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
ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Jingfeng Liu,Jintao Liu,Xuan Zhang,Xingang Liu,Chuhong Zhang
Piezoelectric energy harvesters (PEHs) with porous structures, such as piezoelectric elastic sponges, exhibit high force-to-electricity conversion efficiencies owing to their excellent compression recovery properties. However, conventional preparation methods are limited to producing bulk-form sponge-like PEHs and fail to create more elaborate three-dimensional (3D) structures that could enhance conversion efficiency. Herein, we invent a composite ink consisting of waterborne polyurethane (WPU), barium titanate (BTO), and cellulose nanofibers (CNFs) that is suitable for direct ink writing (DIW) 3D printing. This ink, when coupled with freeze-drying, allows the customization of piezoelectric sponges with functional 3D structures. The printed lattice sponge exhibits remarkable compression recovery of 70% and a notably high relative sensitivity of 9.83 mV/kPa*wt % (where *wt % denotes the BTO content) across a wide pressure range of 2.98–37 kPa, which is approximately three times broader than those of other composite piezoelectric pressure sensors based on BTO or piezoceramic (PZT) materials. Furthermore, a customized 3D piezoelectric sponge with a “boomerang” configuration is utilized as an anisotropic bending sensor on the wrist for intelligently monitoring the stroke posture and programming scientific training for table tennis players. This study highlights a versatile strategy for constructing elastic sponges with high piezoelectricity and designing 3D PEH functional structures that can be applied to flexible self-powered intelligent sensing systems.
研究领域:
材料科学
·
智能系统
·
传感器技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2019
·
IF 3.45
Yushan Yang,Xiaofen Wang,Shunzhong Luo,Xiaoyong Yang,Jiang Ma
[Cs x Ba y ][(Al 3+ ,Ti 3+ ) 2 y + x Ti 4+ 8-2 y - x ]O 16 (0.4 ≤ x , y ≤ 0.8) ceramics were synthesized to investigate the substitution effects of Ba 2+ for Cs + on the stability of hollandite-ceramic waste forms. It was found that the substitution of Ba 2+ for Cs + in the (Cs,Ba)-hollandite system does not cause substantial variation in the crystallographic phase and microstructure. The normalized release rates of Cs and Ba at 90 °C in deionized water were < 0.005 g m −2 d −1 after 28 days. These results indicate that hollandite ceramics are an ideal host for permanent radioactive caesium disposal.
研究领域:
材料科学
·
核废料管理
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）