JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2021
·
IF 8.128
Mingzhen Wang,Yanhui Li,Mingfei Cui,Meixiu Li,Wenshuo Xu,Liubo Li,Yaohui Sun,Bing Chen,Kewei Chen,Yang Zhang
The phenomenon that calcium alginate does not exhibit high adsorption capacity as a carrier material has not been reasonably explained or solved. In this paper, a new viewpoint that the orbital energy level of metal ions and the binding degree of the α-l-guluronate and β-d-mannuronate units affect the adsorption performance of the composite was innovatively proposed. Taking barium alginate (BA) as an example, the possibility of replacing calcium alginate is discussed. Barium alginate/graphene oxide (BA/GO) membranes and three-dimensional (3D) barium alginate-bentonite-graphene oxide derived (3D-BA) hydrogels were prepared by vacuum freeze-drying to remove methylene blue . The structure and morphology of the prepared adsorbents were characterized by scanning electron microscopy, X-ray photoelectron spectroscopy, thermogravimetry and Fourier transform infrared spectroscopy . The effects of adsorbent dosage, doping ratio, temperature, contact time, pH value and initial dye concentration on the adsorption performance of BA composites were investigated. The adsorption capacities of the BA/GO and 3D-BA materials were 1011.3 and 710.3 mg/g, respectively. The BA/GO membrane exhibited stable filtration performance against high concentrations of dyes. Benefiting from the strong interaction between bentonite , sodium alginate and Ba 2+ , the 3D-BA hydrogel showed higher thermal stability and better adsorption efficiency than other materials. The Elovich kinetic model and Sips equation can appropriately describe the adsorption process . The results show that barium alginate is a better carrier material than calcium alginate.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
PubMed
高影响因子
INORGANIC CHEMISTRY
·
2021
·
IF 5.165
Yuanyuan Li,Puxian Xiong,Gaochao Liu,Mingying Peng,Zhijun Ma
Bismuth (Bi)-activated luminescence materials have attracted much attention for their tunable broad emissions ranging from a visible to near-infrared (NIR) region. However, it remains a challenge to regulate the Bi valence state and achieve NIR emission via a facile way. Here, we report the design and preparation of Ba3Sc4O9:Bi phosphors, which emit visible and NIR emissions simultaneously even prepared in the air condition. The self-reduction mechanism of Bi3+ species in Ba3Sc4O9 with a rigid crystal structure is illustrated based on the charge compensation model, and the coexistence of different Bi-active centers, Bi3+ for visible emission, while Bi+ and Bi0 for NIR emission, is confirmed by the spectroscopic data and X-ray photoelectron spectroscopy (XPS) analysis. The enhanced NIR emission was further achieved through controlled reducing treatment and the related mechanism has also been clarified. This work paves a new way to control bismuth valence and tune the emission of Bi-based luminescence materials for emerging photonics applications.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
PubMed
高影响因子
Journal of Materials Chemistry C
·
2024
·Vol. 12
·期 8
·2993-3004
·
IF 5.7
Yujie Wu,Hang Zhao,Na Zhang,Huiqin Wang,Chuying Zhang,Lei Yin,Jinbo Bai
Dielectric capacitors with ultra-high power density and rapid charge–discharge rate are indispensable energy storage components in pulse power systems. However, the low intrinsic energy density of conventional dielectrics limits their application in modern electrical and electronic industries. To solve this problem, in this work, ultrafine BaTiO3 nanoparticles coated with a surface-charged chitosan (CS) shell were synthesized by combining hydrothermal and electrostatic self-assembly approaches. A tiny amount of BaTiO3@CS core–shell construction (∼0.2 vol%) endowed the polypropylene (PP)-based composite dielectrics with a significantly improved energy storage density (Ue) of 4.76 J cm−3, which is a 269% increase compared to that of neat PP (Ue ∼ 1.77 J cm−3). Meanwhile, a high discharging efficiency of 93.9% was also maintained. In addition, the breakdown strength of BaTiO3@CS/PP composite dielectrics (∼435 MV m−1) was effectively improved at an elevated temperature (105 °C), which is 16.9% higher than that of neat PP (∼372 MV m−1). Both the enhanced interfacial polarization and high electron affinity provided by the BaTiO3@CS ultrafine constructions are beneficial to the improvement of dielectric and insulating performances of the composites, which were also confirmed by finite element simulation. This study provides an effective and feasible strategy for preparing composite dielectrics with superior overall energy storage performance.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Zhuohao Qiu,Gaoyuan Chen,Xixi Bao,Jitao Xu,Chengyi Chu,Guangjian Peng,Jianjun Guo,Yuchuan Cheng,Aihua Sun
Barium titanate ceramics exhibit great potential in ceramic capacitors due to their excellent dielectric properties. However, with the highly integrated advancement in electronic components, the preparation of high-capacitance ceramic capacitors with complex structural design has been the focus in current research. In this study, the complex structural barium zirconium titanate is first prepared through direct ink writing (DIW) technique. Subsequently, based on the regulation of zirconium substitution on the phase transition temperature of barium titanate, we reasonably designed zirconium-substituted barium titanate ceramics with varying stoichiometric ratios to regulate the three-phase transition temperatures of zirconium titanate ceramics, and following optimized the sintering temperature of the over-substituted barium zirconium titanate, thus improving the dielectric properties of the barium titanate. The results demonstrate that the solid content of 65 % exhibited the optimal forming precision and the highest densification. Additionally, the over-substituted zirconia alter the phase structure of barium titanate, increasing the proportion of tetragonal phase and subsequently elevating the dielectric constant of the specimens. Notably, among all sintering temperatures tested, the specimen sintered at 1400 °C display the highest proportion of tetragonal zirconia-barium titanate and an optimal dielectric constant. This research offers valuable technical and theoretical insights for the preparation and utilization of zirconium-substituted barium titanate ceramics with intricate structures.
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 SCIENCE-MATERIALS IN ELECTRONICS
·
2025
·Vol. 36
·期 11
·1-15
·
IF 2.8
Zheng Lingling,Wen Juanjuan,Wu Jiayi,Deng Huajuan
This research involved the synthesis of a series of single-phase oxyapatite-type phosphors, Ba 2 La 3 (SiO 4 ) 2 (PO 4 )O:Dy 3+ through a high-temperature solid-state reaction methodology. A comprehensive examination was undertaken to elucidate their crystallographic structure, phase homogeneity, morphological features, photoluminescence (PL) properties, and thermal stability. Phase purity was meticulously assessed via X-ray diffraction (XRD) analysis, confirming the hexagonal crystal system alignment with space group P 6 3 / m (No.176) for the Ba 2 La 3 (SiO 4 ) 2 (PO 4 )O:Dy 3+ phosphors. Excitation at 349 nm revealed a triplet of distinguished emission peaks situated at wavelengths of 480 nm (attributed to the 4 F 9/2 - 6 H 15/2 transition), 572 nm (corresponding to 4 F 9/2 - 6 H 13/2 ), and 664 nm (stemming from 4 F 9/2 - 6 H 11/2 transitions). The investigation pinpointed a 0.05 mol concentration of Dy 3+ as the optimum doping level within the Ba 2 La 3 (SiO 4 ) 2 (PO 4 )O matrix for maximized luminescence. Of note, these phosphors exhibit an abnormal thermal quenching behavior alongside a substantial activation energy barrier E a = 0.37 eV, underscoring their robustness at elevated temperatures. The exhaustive findings from this study for advocating the application of these phosphors in light-emitting devices.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
Materials Today Energy
·
2022
·
IF 9.257
Haoran Xie,Hang Luo,Zhantao Pei,Sheng Chen,Dou Zhang
With increased requirements from the miniaturization, lightweight and integration of electronic devices, it is urgent to improve the discharge energy density ( U e ) of commercial polypropylene (PP) film capacitor. In this work, core-shell structure BaTiO 3 @TiO 2 nanoparticles were introduced into polypropylene matrix via melt mixing method. Due to the existence of the transition layer, the addition of BaTiO 3 @TiO 2 nanoparticles can increase the interfacial polarization of the composites without causing obvious local electric field concentration in comparison with bare BaTiO 3 nanoparticles. Moreover, BaTiO 3 @TiO 2 nanoparticles can act as an electron trap to inhibit the movement of carriers and hinder the growth of the electrical tree, thereby promoting the breakdown strength ( E b ) of PP-based nanocomposites. As a result, the U e of the nanocomposite with 6 wt% BaTiO 3 @TiO 2 nanoparticles was improved from 4.28 J/cm 3 of pure PP to 5.58 J/cm 3 , maintaining a high efficiency of more than 95%. This study provides an effective strategy to optimize energy storage density of PP film capacitors.
研究领域:
材料科学
·
电气工程
✓ 已验证
DOI
高影响因子
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2021
·
IF 7.664
Mingli Han,Zhicheng Shi,Wenqiang Zhang,Kun Zhang,Huanlei Wang,Davoud Dastan,Runhua Fan
High dielectric permittivity materials are widely employed in various electronic devices. To satisfy the ongoing miniaturization of electronic devices, materials with further enhanced dielectric permittivities are strongly desired. In this work, a novel design of epoxy composites based on Ag/Al 2 O 3 /3D-BaTiO 3 foams with hierarchical heterogeneous microstructures are prepared. It is found that, the spatial distribution of the Ag particles can be easily controlled via adjusting the Ag + /Al 3+ mole ratios, yielding highly tailorable dielectric properties. When the Ag + /Al 3+ mole ratios are low, the Ag particles are well isolated by surrounding Al 2 O 3 , yielding the formation of numerous equivalent micro-capacitors and substantially enhanced dielectric permittivity. Moreover, the dielectric permittivities of the composites increase with higher Ag + /Al 3+ mole ratios. Consequently, a high dielectric permittivity of 160 @10 kHz, which is about 35 times that of the epoxy matrix, is achieved in the composite with a Ag + /Al 3+ mole ratio of 1.8. Meanwhile, a low tangent of about 0.062 is maintained. As the Ag + /Al 3+ mole ratio increases, the Ag particles become interconnected, forming Ag networks. Consequently, a plasma-like negative phenomenon which should be attributed to the plasma oscillation of free electrons in the percolative Ag networks, is observed. This work offers an effective route to design polymer composites with tailorable high permittivity and negative permittivity.
研究领域:
材料科学
·
电子工程
✓ 已验证
DOI
高影响因子
INORGANIC CHEMISTRY
·
2018
·
IF 4.7
Lizhu He,Zhen Song,Xionghui Jia,Zhiguo Xia,Quanlin Liu
T-phase (Ba,Ca)2SiO4:Eu2+, showing excellent luminescent thermal stability, has a positionally disordered structure with the splitting of five atom sites, but until now the reason has remained unclear. Herein, we investigate the coordination environments of each cation site in detail to understand the origins of the atom site splitting. We find that the three cation sites in the split-atom-site model are optimally bonded with ligand O atoms compared to the unsplit-atom-site model. This atom site splitting results in larger room and smaller room for each splitting cation site, which just accommodates larger Ba2+ ions and smaller Ca2+ ions, respectively, leading to more rigid structure. Based on the X-ray diffraction data refinement, the boundary of the T-phase for (Ba1–xCax)2SiO4 is redetermined. The Eu2+-doped T-phase (Ba,Ca)2SiO4 phosphors show excellent luminescent thermal stability, which can be attributed to optimal bonding and more rigid structure with atom site splitting. These results indicate that T-phase (Ba,Ca)2SiO4:Eu2+ phosphors have promise for practical applications.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
ACS Applied Polymer Materials
·
2025
·
IF 4.7
Zhihua Liu,Qingwen Yuan,Mengman Weng,Kangwei Xia,Wenxu Rao,Zhao-xia Huang,Jin-Ping Qu
Benefiting from advanced stretchability, durability, and flexibility, piezoelectric polymers have gained significant attention in multiple applications including sensing, energy harvesting, and wearable devices. However, their application in smart tires remains relatively underexplored due to the limited elasticity of most piezoelectric polymers. In this work, we developed a superior piezoelectric elastomer using a dynamic forced vulcanization (DFV) technique to harness energy for automotive tire sensors. Natural rubber/barium titanate (NR/BTO) composites prepared from this innovative approach exhibited remarkable piezoelectric properties, enhanced mechanical strength, and impressive durability. Comprehensive testing was conducted on the samples produced via DFV, focusing on vulcanization characteristics, thermal stability, and thermo-mechanical properties, which indicated notable advancements in the evolution of the cross-linked structure and its performance under cyclic pulsating forces. As expected, the optimal sample obtained through DFV shown a high piezoelectric coefficient (d33) of 14.8 pC/N, a consistent voltage output of 20.1 V, and a sensitivity of 310.3 mV/N due to the preferred orientation of crystal planes. Consequently, the NR/BTO composites generating stable, sufficient, and renewable voltage can be utilized at powering sensors of vehicles with different weights and velocities. This work shows the potential of piezoelectric elastomers in energy harvesting applications within the automotive sector, paving the way for innovative developments in smart tire technology and enhancing the functionality of vehicular systems.
研究领域:
材料科学
·
汽车工程
·
传感器技术
✓ 已验证
产品关联
DOI
高影响因子
DESALINATION
·
2025
·
IF 9.8
Xin Wen,Yuyan Hai,Rui Ma,Xu Liang,Yawei Duan,Jingyun Chen,Hui Wei,Rihua Xiong
Reverse osmosis (RO) membranes have been widely used in water treatment systems and exhibit outstanding separation performance. However, due to the complex composition of industrial wastewater, insoluble inorganic scales (e.g., barium sulfate) are difficult to remove from the membrane surface, which severely impairs the membrane performance. Herein, pH-responsive “molecular springs” were grafted onto the fouled polyamide RO membrane by directly penetrating the inorganic scale layers. The “molecular springs” stretch and shrink with pH variations, enabling the removal of barium sulfate scales through simple alkali-acid cleaning. The content of barium scales on the membrane surface was found to significantly decrease from 45.74 % to 0.61 %, resulting in an increase of membrane flux from 60.99 L/(m 2 h) to 71.94 L/(m 2 h). For the full size membrane modules, this study has also demonstrated that the insoluble scales on the industrial RO membrane can be removed as effectively and easily as the soluble scales by grafting “molecular springs”.
研究领域:
水处理
·
膜技术
·
表面化学
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Shuimiao Xia,Yang Quan,Zelong Chang,Davoud Dastan,Zhicheng Shi
High-performance polymer composites with excellent dielectric and energy storage capabilities are urgently needed for advanced electronic power systems, but traditional strategies have been challenging to balance high dielectric constant, low loss and breakdown strength. Herein, an innovative Au/Ag/BaTiO 3 composite skeleton is prepared by loading Au/Ag bimetallic nanoparticles onto BaTiO 3 . In which, Ag nanoparticles are loaded inside of BaTiO 3 by in-situ growth. The Au nanoparticles are loaded on the surface of BaTiO 3 via physical vapor deposition. The BaTiO 3 skeleton plays a dual role in high polarization and blocking the formation of conductive pathways by metal nanoparticles. The results show that the Au/Ag/BaTiO 3 /PVDF nanocomposites exhibit a high dielectric constant of 56.6 at 10 kHz, which is 590 % higher than that of pure PVDF ( 8.2@10 kHz) due to the micro-capacitors effect induced by Au/Ag bimetallic nanoparticles. Due to the Coulomb blockade effect of Au nanoparticles, the dielectric loss of the composites is only 0.037 at 10 kHz, which is 24.5 % lower than that of pure PVDF ( 0.049@10 kHz). Notably, the nanocomposite achieves simultaneously a breakdown strength of 294 kV/mm and an energy density of 6.9 J/cm 3 , which are 141 % and 578 % of pure PVDF, respectively. Mechanical tests show that the skeleton also improves the Young's modulus of the composites (1700 MPa compared to 520 MPa for PVDF). The results demonstrate the potential of Au/Ag/BaTiO 3 composite skeletons for high-performance dielectric applications and provide a new strategy for designing advanced polymer composites.
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 Inorganic and Organometallic Polymers and Materials
·
2024
·Vol. 34
·期 6
·2501-2509
·
IF 3.9
Lin Jing,Feng Mengna
Ceramic/polymer dielectrics with excellent thermal stability and high dielectric performance exhibit great potential in advanced capacitor applications. It is still a major challenge for ceramic/polymer dielectrics to obtain high dielectric constant at low content while maintaining excellent flexibility. To alleviate this issue, here, a flexible polymer dielectric composite consisting of poly(arylene ether nitrile) (PEN) matrix and barium titanate filler coated by Carbon and polypyrone (h-BT@C@PPy) was put forward in this work. The as-prepared composite films displayed high dielectric constant, comparable low loss and favorable interfacial binding due to the hydrogen-bonding interaction between –NH of h-BT@C@PPy and –CN of PEN, effectively promoting the interfacial polarization and remedying the internal interface defects between h-BT and PEN. Consequently, an addition of 8 wt% h-BT@C@PPy into PEN matrix raised the dielectric constant from 3.82 to 13.3 at 1 kHz, while maintaining relatively low dielectric loss (0.05@1 kHz). However, the breakdown strength showed a decreasing trend with the lowest value of 60.37 kV mm −1 . Meanwhile, the better flexibility, outstanding thermal stability (the 5% weight loss above 500 °C) as well as excellent permittivity-temperature stability was also delivered by the PEN-based composite films. This strategy furnishes a perspective to design ceramic/polymer dielectrics with high- k achieved at low filler content for the applications of organic film capacitors.
研究领域:
材料科学
·
聚合物复合材料
·
介电材料
·
纳米技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）