JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2023
·Vol. 106
·期 10
·6194-6204
·
IF 3.9
Yang Li,Dehua Wang,Ye Lu,Hebin Li,Yangmo Liu,Yuankun Li,Mingxiang Li,Zifei Meng,Lixiang Chen,Hanbin Wang,Keqing Ruan,Xiaoxiong Wang
Flexible inorganic functional materials have received extensive attention in recent years due to their unique properties and potential application prospects. Among various flexible materials, ceramic fiber membranes have great application prospects due to their functional original structure. Unlike other materials, such as one-dimensional flexible ice, two-dimensional BaTiO 3 , and three-dimensional α-Ag 2 S, ceramic fiber membranes are high-performance materials with a functional unit structure. In the field of electrospinning, electrospinning technology can effectively control the microstructure of ceramic fibers, allowing for multileveled structure design, such as ordered electrospinning technology and disordered electrospinning technology, which can effectively control the functional primitive structure. However, the mechanical behavior of these structures is still poorly understood. In this groundbreaking study, we investigated the functional original structure of CaTiO 3 :Eu 3+ electrospinning fiber membranes from the bottom-up and explored the effect of grain diameter ratio on mechanical behavior and studied the effect of Eu 3+ ions on the luminescent properties of CaTiO 3 functional fiber membranes. By controlling the electrospinning parameters and avoiding inherent mechanical property differences between the microcrystals, we realized the stress concentration design from the perspective of functional element structure. Our results show that the stress concentration design at the bottom of the multileveled structure significantly affects the overall mechanical behavior. This work proposes a new method to control the mechanical properties of inorganic functional ceramic fiber membranes through functional element structure design and provides the first bottom-ordered regulation method, offering a new dimension for future research in this field.
研究领域:
材料科学
·
力学
·
光学
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2020
·
IF 7.489
Enhui Jiang,Lili Yang,Ning Song,Xiaoxu Zhang,Chunbo Liu,Hongjun Dong
It is highly desirable to combine the microstructure management and heterostructure construction technique to remold inherent wide band gap semiconductor CaTiO 3 with the purpose of enhancing its visible light absorption capacity and photocatalytic performance. Herein, a novel multi-shelled hollow cube Bi 12 O 17 Cl 2 /CaTiO 3 heterostructure has been successfully synthesized by a facile template-free method for photocatalytic hydrogen production and degradation pollutants in water under the visible light . The investigations of microstructure, physicochemical property and photoelectric behaviors indicate that the multi-shelled hollow cube architecture and synergetic effect of 2D-3D structural coupling are dominant reasons to enhance phototcatalytic performance, which can significantly improve the absorption and utilization of visible light, multiply abundant active radical generation and boost the separation and migration efficiency of photoproduced electron-hole pairs. Moreover, the probable photocatalytic reaction mechanisms, the feasible migration behaviors of photo-produced charges, the influence factors of enhancing photocatalytic activities are proposed in depth. It is intended that further innovative works on the multi-shelled hollow cube architecture design of high-performance photocatalyst by facile template-free hydrothermal method can be inspired.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2017
·
IF 3.387
Ziyuan Jiang,Jiaqi Pan,Beibei Wang,Chaorong Li
The two dimensional(2D) Z-scheme AgCl/Ag/Ca/TiO 3 nano-heterojunction is synthesized via simple preparation of hydrothermal-chemical co-deposition method. The results of SEM, EDS, elemental mapping, XRD, TEM, XPS and Raman shift imply that the AgCl/Ag nanoparticles have deposited on the surfaces of CaTiO 3 nanosheets successfully. Compared with the unmodified samples, the photocatalytic activity of the as-prepared 2D AgCl/Ag/CaTiO 3 nano-heterojunction exhibits a remarkable enhancement by the hydrogen production. Further, the photocatalytic process has been studied and the mechanism of the photocatalytic hydrogen production enhancement has been provided, which could be ascribed to the Z-scheme heterojunction and 2D lamellar structure of the CaTiO 3 .
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
Inorganic Chemistry Frontiers
·
2025
·
IF 6.4
Ting-Ting Shen,Jing Liu,Fang-Yuan Bai,Wei-Wei Xu,Xue Yong,Zhi-Rong Li,Jing-Ru Han,Jun Chen,Heng Zhao,Zhi-Yi Hu,Yu Li,Bao-Lian Su
Biomass photoreforming to coproduce sustainable hydrogen and valuable chemicals is a potential strategy for alleviating energy and environmental issues. However, the lack of bifunctional catalysts to efficiently achieve the “one stone kills two birds” scenario greatly limits its practical application. Herein, we rationally design a three-dimensionally ordered macro-porous structure (3DOM) CaTiO3 (CTO) to address the mass diffusion and light harvesting and to load ZnxCd1-xS (ZxC1-xS) quantum dots (QDs) realizing the selective glucose photoreforming process. The regulatable band gap of ZxC1-xS endows 3DOM CTO-ZxC1-xS composites with sufficient light absorbance and adjustable redox potentials. As a result, the optimized 3DOM CTO-Z0.5C0.5S delivers the best performance for sustainable hydrogen evolution from glucose photoreforming with the rate of 4.05 mmol g-1 h-1 and the apparent quantum efficiency (AQY) of 6.48% under monochromatic light of 365 nm. In particular, the well-developed photocatalysts simultaneously produce gluconic acid with the selectivity up to 83.8% from the targeted oxidation of terminal aldehyde group of glucose. The DFT calculations on Gibbs free energy change of HER and the energy difference between reactants and products of OER further reveal that the constructed Z-scheme heterojunction contributes to the spatial separation of photogenerated electrons and holes for a good quantum efficiency and liquid product selectivity. This work demonstrates a sustainable technology for the coproduction of hydrogen and value-added chemicals from photocatalytic biomass valorization.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Catalysis Science & Technology
·
2018
·Vol. 9
·期 2
·336-346
·
IF 5.365
Jinjin Lin,Jiangshan Hu,Chengwei Qiu,Huijuan Huang,Lu Chen,Yanyu Xie,Zizhong Zhang,Huaxiang Lin,Xuxu Wang
Solar-driven carbon dioxide (CO2) reduction with water is an important and attractive approach for converting CO2 to fuel and chemicals. Developing intimate heterostructure photocatalysts is essential for efficient solar energy conversion. Here, we fabricated an efficient CaTiO3/TiO2 heterostructure composite by simple in situ hydrothermal etching of {001} facet-exposed TiO2 nanosheets with saturated calcium hydroxide solution. CaTiO3/TiO2 not only possesses an intimate contact heterostructure due to its matching band structures and similar crystal structures but also has enhanced-surface basicity to facilitate CO2 adsorption and activation for the CO2 conversion. Under irradiation, the CaTiO3/TiO2 sample greatly enhances photocatalytic CO2 reduction and shows CO production (11.72 μmol g−1 h−1) 5.6 times higher than that of bare TiO2 nanosheets. The excellent photocatalytic performance of the CaTiO3/TiO2 heterostructures is attributed to the intimate construction of CaTiO3 on TiO2 nanosheets to facilitate the separation of photogenerated charges and the basicity of CaTiO3 to provide more abundant active sites for CO2 adsorption. This study provides fundamental guidance for the rational design of efficient heterostructure photocatalysts for an outstanding photocatalytic CO2 reduction performance.
研究领域:
材料科学
·
环境科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2018
·
IF 4.439
Jishu Han,Ying Liu,Fangxu Dai,Ruiyang Zhao,Lei Wang
Novel CdSe/CaTiO 3 nanocomposites are prepared in aqueous phase and used for photocatalytic hydrogen production. The modification of CdSe QDs on the surface of CaTiO 3 sheet-like structure effectively increases visible light absorption of nanocomposites, improves the separation and transfer of photoinduced electrons and prevents the recombination of electron-hole pairs. Experimental results show that obtained CdSe/CaTiO 3 nanocomposites possess significantly enhanced photocatalytic hydrogen production performance. The photocatalytic hydrogen production amount of CdSe/CaTiO 3 is 48 times higher than that of pure CaTiO 3 and 4.14 times higher than that of CdSe QDs. Meanwhile, CdSe/CaTiO 3 nanocomposites display high stability and recyclability, which is beneficial for photocatalytic hydrogen production application.
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Xiaocui Rao,Xueting Fu,Hai Jiang,Weiping Li,Laihui Luo
In this work, the cold sintering assisted process was utilized to fabricate dense 0–3 type (1- x )BaTiO 3 - x CaTiO 3 :Pr 3+ ((1- x )BT- x CT:Pr 3+ , x = 0.1, 0.2 and 0.3) binary composite ceramics. Under the combined action of uniaxial pressure and temperature, CT:Pr 3+ has been successfully integrated with BT to form the preliminary BT-CT:Pr 3+ composites during cold sintering. It is found that the cold sintering could increase the grain size a little, and annealing at 900 °C significantly promotes the grain size. The prepared (1- x )BT- x CT:Pr 3+ composite ceramics have a pure phase of CT:Pr 3+ , which is difficult to prepare using high temperature solid reaction method when x < 0.23. It is found that all the composite ceramics exhibit excellent ferroelectric properties . Furthermore, a strong photoluminescence , photo-stimulated luminescence and thermal luminescence properties have been obtained. Present study illustrates a potential approach to combine luminescent and piezoelectric properties into the ferroelectric-based composite ceramics by the cold sintering assisted sintering.
研究领域:
材料科学
·
光学
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
Crystals
·
2022
·Vol. 12
·期 4
·512
·
IF 2.67
Zhijian Wang,Feng Pan,Lanlan Liu,Qifeng Du,Ruitao Tang,Jun Ai,Hong Zhang,Ying Chen
Mg2SiO4holds promise for its application in the microwave communication field due to its low dielectric constant and highQ×fvalue. However, its high negativeτfand high sintering temperature limit its application in low-temperature co-fired ceramic (LTCC) devices. In this work, Li2TiO3and CaTiO3were introduced to improve theτf, and LiF was chosen to decrease the sintering temperature. According to XRD patterns and SEM micrographs, the ceramic systems displayed a complex-phase structure, and the microstructure was densified when CaTiO3was added. All of the relative densities, dielectric constants, andQ×fvalues first increased and then decreased as the sintering temperature increased. The MLLC11.5 ceramics sintered at 800 °C could be obtained with the highestQ×fvalue of 54,581 GHz (at 8.06 GHz),εrof 14.13, andτfof + 5.81 ppm/°C. Furthermore, it was proven that the MLLC11.5 powders could be co-fired without any reaction with Ag powders at 800 °C, indicating its potential for LTCC application. The MLLC11.5 composition was used to prepare a GPS antenna and showed good prospects for its application in electronic communications.Keywords:Mg2SiO4-Li2TiO3-LiF-CaTiO3ceramics;structure;microwave dielectric property;LTCC;antenna
研究领域:
材料科学
·
电子工程
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2016
·
IF 3.014
Renping Cao,Ting Fu,Haidong Xu,Wenjie Luo,Dedong Peng,Zhiquan Chen,Jingwei Fu
CaTiO 3 :Bi 3+ and CaTiO 3 :Bi 3+ , Al 3+ /B 3+ phosphors are synthesized by solid-state reaction method in air. With excitation 272 and 320 nm, broad PL band peaking at 555 nm with full width at half maximum ∼200 nm is observed in the range of 400–800 nm due to the 3 P 1,0 → 1 S 0 transitions of Bi 3+ ion. PLE spectrum monitored at 555 nm contains two PLE band peaking at ∼272 and 320 nm within the range 230–420 nm owing to metal-to-metal charge-transfer and 1 S 0 → 3 P 1 transition of Bi 3+ ion, respectively. The optimal Bi 3+ doping concentration in CaTiO 3 :Bi 3+ phosphor is about 0.5 mol%. Luminescence properties of CaTiO 3 :Bi 3+ phosphor may be improved obviously by co-doping Al 3+ /B 3+ ions, and its emission intensity can be enhanced 13–15 times after Al 3+ ion is co-doped. Luminous mechanism of CaTiO 3 :Bi 3+ phosphor is analyzed by energy level diagram of Bi 3+ ion. Decay curve and time-resolved spectra confirm that only a single type of Bi 3+ luminescence center exists in CaTiO 3 :Bi 3+ phosphor.
研究领域:
材料科学
·
光学
·
发光材料
✓ 已验证
产品关联
DOI
高影响因子
POLYMER COMPOSITES
·
2024
·Vol. 45
·期 12
·11093-11103
·
IF 4.8
Longtao Xiao,Fei Liang,Zikang Zhou
The present study used polyphenylene ether/Polypropylene/glass fiber (PPO/PP/GF) composites as the matrix material to obtain the dielectric plate material to be used in the dielectric phase shifters for 5G base stations. First, the reinforcement effect of the compound compatibilizers comprising PP-g-MAH and SEBS-g-MAH on the PPO/PP/GF composites was investigated. The experimental results revealed that the compound compatibilizers could dramatically improve the compatibility and performance of the PP/PPO/GF composites through synergistic compatibility. Next, the crystallization effect of CaTiO 3 fillers on the PPO/PP/GF composites was investigated. The DSC analysis revealed that using a small amount of CaTiO 3 promoted the crystallization of PP, while using a large amount of CaTiO 3 inhibited the crystallization effect. At a compatibilizer content of 6 wt% and CaTiO 3 in the range of 10–85 wt%, the CaTiO 3 /PP/PPO/GF composite presented a continuously adjustable dielectric constant (ε r = 2.32–20.9), low dielectric loss (tanδ < 0.0019), and high heat resistance (VST = 169.5–177°C), and could, therefore, be used as a dielectric plate material in the dielectric phase shifters for 5G base stations. Highlights The compound compatibilizers comprising PP-g-MAH and SEBS-g-MAH could dramatically improve the compatibility and performance of the PP/PPO/GF composites through synergistic compatibility. A small amount of CaTiO 3 promoted the crystallization of PP and a large amount of CaTiO3 inhibited the crystallization effect. The CaTiO 3 /PP/PPO/GF composites could serve as ideal dielectric plate materials in the development of dielectric phase shifters for 5G base stations.
研究领域:
材料科学
·
高分子化学
·
电子材料
✓ 已验证
产品关联
DOI
高影响因子
FERROELECTRICS
·
2017
·
IF 0.551
Shaolei Xie,Shuangbin Li,Jiang Xiao,Ying Yao,Yongzhong Jia
PbTiO3 and CaTiO3 ceramics are prepared at temperatures above 2000°C by a direct current arc discharge technique under an argon atmosphere, and the microstructure, components and morphology of each material are investigated. Both samples show the formation of a perovskite structure. Moreover, a tetragonal phase is found in the PbTiO3 ceramic material, and a cubical phase is formed in the CaTiO3 ceramic material. In this work, PbTiO3 and CaTiO3 ceramics were rapidly prepared using a simple DC arc discharge technique; we found this technique of ceramic material synthesis was much faster and better than conventional methods. The whole reaction process only takes 30 seconds because of ultrafast kinetics of crystallization.
研究领域:
材料科学
·
陶瓷工程
✓ 已验证
产品关联
DOI
高影响因子
Small
·
2024
·
IF 13
Hong Zhou,Jing Cao,Yehuan Ji,Mengyao Xia,Weifeng Yao
Piezocatalysis, a transformative mechanochemical energy conversion technique, has received considerable attention over the past decade for its role in processes such as hydrogen evolution from water. Despite notable progress in the field, challenges remain, particularly in the areas of limited piezocatalysis efficiency and limited availability of materials requiring a non-centrosymmetric structure. Here, a pioneering contribution is presented by elucidating the piezocatalytic properties of hollow CaTiO 3 nanocuboids, a centrosymmetric material with a nominally nonpolar state. Remarkably, CaTiO 3 nanocuboids exhibit an impressive hydrogen production rate of 3.44 mmol g −1 h −1 under ultrasonic vibrations, surpassing the performance of the well-established piezocatalyst BaTiO 3 (2.23 mmol g −1 h −1 ). In contrast, commercial CaTiO 3 nanoparticles do not exhibit piezocatalytic performance. The exceptional performance of hollow CaTiO 3 nanocuboids is attributed to the abundance presence of twin boundaries on the {110} facet within its crystal structure, which can impart significant polarization strength to CaTiO 3 . Extending the investigation to other centrosymmetric materials, such as SrZrO 3 and BaZrO 3 , the experimental results also demonstrate their commendable properties for piezocatalytic hydrogen production from water. This research underscores the significant potential of centrosymmetric materials in piezocatalysis.
研究领域:
材料科学
·
纳米技术
·
催化
·
能量转换
·
机械化学
✓ 已验证
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）