CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Cheng Su,Bingzhu Wang,Huan Guo,Jixiang Dai,Jianjun Sha
In view of the high sintering temperature and difficulty in densification of the ultra-high temperature ceramics(UHTCs), a novel reactive hot-pressing process was designed to achieve the low temperature densification of high strength (Zr,Ta)B 2 -SiC ceramics. It was found that the mechanical properties were closely associated with the microstructure, being dependent on the sintering temperature. The microstructure characterization revealed that the main phases of ceramic were incompletely solid soluted borides and SiC at the sintering temperature of 1600 °C; while at 1700 °C, the boride ceramics were completely solid soluted (Zr,Ta)B 2 and formed an interlocking structure with SiC. The evaluation of mechanical properties indicated that the flexural strength of the ceramics increased from 470.2 MPa to 736.7 MPa when the sintering temperature increased from 1600 °C to 1800 °C. Correspondingly, the fracture toughness increased from 3.54 MPa·m 1/2 to 4.10 MPa·m 1/2 . The improvement of mechanical properties were mainly attributed to the interlocking structure formed by the solid solution (Zr,Ta)B 2 and SiC, which caused the crack propagation path becoming tortuous along the interface of different phases.
研究领域:
材料科学
·
陶瓷工程
✓ 已验证
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2023
·
IF 7.7
Chunmei Gao,Peng Zou,Shifeng Ji,Yunqing Xing,Jiaonan Cai,Jinjian Wu,Tianyang Wu
Herein, we report a preparation method based on a modified zeolite imidazolate skeleton loose nanofiltration membrane used to achieve the efficient separation of salt and dye from dye wastewater. In this study, negatively charged hydrophilic TA@ZIF-8 was synthesized using a tannin surface-functionalization-assisted etching process by tannic acid (TA). A novel, highly negatively charged, and loose nanofiltration membrane was then prepared by adding TA@ZIF-8 to a polyethyleneimine (PEI) and tricarboxylic acid (TMA) crosslinking system. The addition of TA@ZIF-8 nanoparticles not only changed the degree of crosslinking of PEI/TMA but also provided a preferential channel for water molecules, thereby improving the flux of the membrane. Then, the success of TA@ZIF-8 NPs and membranes preparation were verified by SEM, XRD, FT-IR, TGA , BET, XPS and other methods. The results showed that the optimal preparation conditions were 0.020 wt% TA@ZIF-8 loading, and the contact angle of the membranes decreased from 79.8° to 53.7°. The water flux of the membrane is 81 L·m −2 ·h −1 ·bar −1 , which is 1.5 times that of PEI/TMA membrane. In addition, TA@ZIF-8–2 membrane not only has high rejection rate for Methyl blue (98.7 %), Toluidine blue (89.6 %), Cr 6+ (91.2 %), but also maintains high transmittance for NaCl and Na 2 SO 4 . Besides, the separation performance of the membrane was stable for a long time in a mixed solution of dye and salt and excellent antifouling performance. Therefore, the loose TA@ZIF-8/PEI/TMA nanofiltration membrane has broad application prospects in printing and dyeing wastewater treatments .
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED ELECTROCHEMISTRY
·
2021
·Vol. 52
·期 3
·573-581
·
IF 2.8
Zhao Ruiyu,Wang Yi Mou,Li Jie,Meng Wenhua,Yang Chunli,Sun Chongxiang,Lan Xuefang
Ni, Ce, and Ta modified Ti/SnO 2 –Sb 2 O 5 –RuO 2 anodes were first prepared by thermal decomposition strategy and applied for Orange G degradation to explore the effect of Ni, Ce, and Ta modification on electrocatalytic property. The Ta modified anode showed the highest ·OH generation capability and the lowest charge transfer resistance among all samples, conducive to electrocatalytic degradation of Orange G. Besides, the Ta modified anode shows more cracks than Ni and Ce modified anodes, which is expected to create more specific surface areas and more exposed active sites for Orange G degradation. The degradation efficiency and the total organic carbon (TOC) removal rate increased in the order Ru < Ru–Ni < Ru–Ce < Ru–Ta, with Ru–Ta showing the highest degradation efficiency of 98.6% and 44.2%, much higher than 79.6% and 27.5% of Ru, respectively.
Graphical abstract
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Materials Research Express
·
2020
·Vol. 7
·期 2
·025518
·
IF 1.929
Jiali Xue,Kuibao Zhang,Daimeng Chen,Jianjun Zeng,Baozhu Luo
Ta-doped Li7La3Zr2O12 (Ta-LLZO) solid electrolyte ceramics were synthesized by solid-state sintering, spark plasma sintering (SPS) and SPS plus heat-treatment (two-step method) using LiOH·H2O, La2O3, ZrO2 and Ta2O5 as the raw materials. The Ta-LLZO samples prepared from these three routes are all in cubic phase structure. However, the solid-state method results in Ta-LLZO samples with different particle sizes and porous morphology, while the samples prepared by SPS route contain fewer internal voids and smaller particle size. The two-step method not only retains the high compactness of SPS samples, but also the increment of grain size. The SEM results demonstrate that Ta-LLZO sintered by the two-step method shows optimal electrical properties. And the total ionic conductivity is 4.6 × 10−3 S cm−1 at 150 °C and the activation energy is calculated to be 0.38 eV.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Advanced Ceramics
·
2022
·Vol. 11
·期 10
·1530-1541
·
IF 11.534
Zhang Chang,Hu Xiangchen,Nie Zhiwei,Wu Cong,Zheng Nan,Chen Shaojie,Yang Yihang,Wei Ran,Yu Jiameng,Yang Nan,Yu Yi,Liu Wei
Garnet-type oxide is one of the most promising solid-state electrolytes (SSEs) for solid-state lithium-metal batteries (SSLMBs). However, the Li dendrite formation in garnet oxides obstructs the further development of the SSLMBs seriously. Here, we report a high-performance garnet oxide by using AlN as a sintering additive and Li as an anode interface layer. AlN with high thermal conductivity can promote the sintering activity of the garnet oxides, resulting in larger particle size and higher relative density. Moreover, Li 3 N with high ionic conductivity formed at grain boundaries and interface can also improve Li-ion transport kinetics. As a result, the garnet oxide electrolytes with AlN show enhanced thermal conductivity, improved ionic conductivity, reduced electronic conductivity, and increased critical current density (CCD), compared with the counterpart using Al 2 O 3 sintering aid. In addition, Li symmetric cells and Li∣LiFePO 4 (Li∣LFP) half cells using the garnet electrolyte with the AlN additive exhibit good electrochemical performances. This work provides a simple and effective strategy for high-performance SSEs.
研究领域:
材料科学
·
电化学
·
能量存储
✓ 已验证
DOI
高影响因子
JOURNAL OF ELECTRONIC MATERIALS
·
2023
·Vol. 52
·期 11
·7184-7192
·
IF 2.1
Yang Shengyan,Chang Niannian,Han Mengyuan,Zhang Yang
Pb-free piezoelectric ceramic materials (K 0.48 Na 0.48 Li 0.04 )(Nb 0.92 Ta 0.08− x Sb x )O 3 (KNLNTS) were designed and prepared. The effects of varied Sb/Ta doping on the physical structure, surface morphology, and electrical characteristics of ceramics were also studied. The perovskite structure is present in all of the doped ceramic samples without any secondary phase (when x < 0.05). All of the doped ceramic samples have a Curie temperature ( T C ) above 300°C. At the same time, the orthorhombic–tetragonal phase transition temperature ( T O–T ) is pushed closer to ambient temperature. Doping with Sb/Ta/Li changed the electrical characteristics of the samples and increased their piezoelectric properties. At x = 0.03, the KNLNTS sample has the best piezoelectric properties: d 33 = 215 pC/N, Pr = 26.08 μC/cm 2 , T C = 342.6°C.
研究领域:
材料科学
·
物理学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Tingyan Deng,Zhen Cao,Fan Ni,Li Zhao,Fei Shen,Jianmei Zou,Yanzong Zhang,Yating Chen,Jinsong He
The novel strategy of thin-film nanocomposite loose nanofiltration (LNF) membranes incorporating an interlayer of nanomaterials has raised growing interests for the high-performance membrane design. Although the effects of membrane structure on separation performance have been elucidated for a long time, however, the quantitative structure-performance relationship of interlayer-based LNF membranes has not been established. In this study, we established the structure-performance relationship of TA-MoS 2 interlayer based LNF membranes from a quantitative level for the first time. The correlation heat map analysis identified four key structural parameters (e.g. selective layer thickness, crosslinking degree, water contact angle, and zeta potential) for water permeability as well as dye rejection, and three key structural parameters (e.g. selective layer thickness, crosslinking degree, and zeta potential) for salts rejection, respectively. Furthermore, the multiple linear regression analysis revealed the rigorous mathematic modeling of key structural parameters-separation performance relationships with all R 2 values above 0.899, and determined the contributions of each key structural parameter to the separation performance in a quantitative level. Finally, the optimal TA-MoS 2 interlayer based LNF membrane exhibited a high water permeability of 80.2 LMH·bar −1 , effective separation of dye/salts (rejection rate: congo red (99.0%), methyl blue (95.1%), Na 2 SO 4 (1.5%) and NaCl (0.5%)), good stability and antifouling properties (i.e. water flux recovery rate (FRR) of 96% for humic acid). This study can pave the way of quantitatively design of interlayer-based LNF membrane with targeted performance.
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Yang Liu,Jia-Ji Liang,Wei-Ming Guo,Chao Chang,Xiao-Ming Duan,De-Chang Jia,Hua-Tay Lin
High-temperature thermal stability plays a crucial role in the structural application of pressureless liquid-phase sintered SiC (PLS-SiC) ceramics. In this paper, a PLS-SiC ceramic processed with CeO 2 –Al 2 O 3 as sintering additives with excellent high-temperature thermal stability was achieved by incorporating (Hf, Zr, Ta, Nb, Ti)B 2 (HEB) particles. Results showed that PLS-SiC ceramics with HEB-free underwent a structural change from dense to porous microstructure after annealing at 1800 °C/1 h. Conversely, PLS-SiC ceramics with the addition of 10 vol% HEB exhibited excellent thermal stability, as evidenced by the retention of their dense microstructure after exposure to annealing at 1800 °C/1 h. The possible primary reasons for this significantly different response to the thermal stability could be probably attributed to fact that HEB reacted with CeAlO 3 and SiC to form solid-phase products, subsequently inhibiting the formation of gas-phase products after decomposition of CeAlO 3 alone in a high-temperature vacuum environment. In addition, the formation of a compact protective outer layer containing Hf–Ta containing diboride in PLS-SiC ceramics during the annealing process could effectively hinder the volatilization of volatile substances at a high temperature.
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
SOLID STATE IONICS
·
2022
·
IF 3.699
Tianxiang Ning,Yanzhi Zhang,Qian Zhang,Xuefeng Shen,Yinyi Luo,Taoyong Liu,Piao Liu,Zhiwei Luo,Anxian Lu
In this study, Ta single-doped Li 6.4 La 3 Zr 1.4 Ta 0.6 O 12 (Ta 0.6 ) and a series of Ta, Sr co-doped Li 6.4+x La 3-x Sr x Zr 1.4 Ta 0.6 O 12 (Ta 0.6 Sr x , x = 0.1, 0.2, 0.3, and 0.4) electrolytes are synthesized via a two-step process. The XRD result reveals that all samples have a pure cubic phase, which indicates that Ta 5+ and Sr 2+ can enter the lattice of LLZO and stabilize the cubic phase. The SEM images exhibit that all samples have a dense microstructure and tight grain boundary without obvious holes. The excellent properties are achieved when the doping amount of Sr reaches 0.2 mol. Among all designed samples, the Ta 0.6 Sr 0.2 has the highest Li + conductivity and relative density of 8.54 × 10 −4 S cm −1 and 98.79%, respectively, as well as the lowest activation energy roughly 0.302 eV. Additionally, the symmetrical cell's galvanostatic cycling data show that it has excellent cycling performance and extremely low overpotentials even after 350 cycles, indicating that it can be successfully applied to next-generation all-solid-state lithium-ion batteries (ASSLIBs).
研究领域:
材料科学
·
电化学
·
能量存储
✓ 已验证
DOI
高影响因子
MINERALS ENGINEERING
·
2025
·
IF 5
Jiaozhong Cai,Shuiping Zhong,Jiushuai Deng,Bozeng Wu,Chengyan Xu,Xiaopeng Chi,Guangsheng Zeng,Wei Weng,Wen Tan,Junnan Chen
Talc is a layered silicate mineral with pronounced crystal anisotropy, consisting of a basal (001) surface and an edge (100) surface, which complicates its separation from valuable minerals. In this study, tannic acid (TA) was used as a depressant, and its adsorption behaviors on the two representative surfaces of talc—silica (basal plane surface) and magnesium silicate (edge surface)—were systematically investigated using experimental methods and molecular simulations. TA addition reduced the contact angles of the talc basal and edge surfaces by 30.5° and 22.7°, respectively, indicating enhanced hydrophilicity. ToF-SIMS analysis revealed that TA physically adsorbs onto the silica surface, while both physical and chemical interactions occur on the magnesium silicate surface. AFM showed lumpy adsorbate on the silica surface and point-like adsorbate on the magnesium silicate surface, with a greater roughness change observed for the former. QCM-D measurements confirmed that TA formed a multilayer flexible adsorbate on the silica surface and a dense, rigid monolayer on the magnesium silicate surface. Molecular dynamics simulations further revealed that van der Waals interactions dominated TA adsorption on the (001) surface, while electrostatic interactions prevailed on the (100) surface. These findings provide insight into the selective depression mechanism of talc and offer guidance for the depression of other layered silicate minerals.
研究领域:
矿物加工
·
表面化学
·
分子模拟
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS RESEARCH BULLETIN
·
2017
·
IF 2.446
Xiao-yu Sun,Chang Liu,Zheng Chen,Yong-qing Ma
In order to reveal the effects of dopant average valence on the photocatalytic performance, Ta and Rh co-doped Ti 0.96 Ta 0.04−x Rh x O 2 (x = 0, 0.008, 0.016, 0.02, 0.024, 0.032, and 0.04) samples were crystallized at 450 °C and 800 °C, respectively; then the 800 °C crystallized x = 0.02 sample was subsequently reduced in the H 2 /N 2 mixture gases at 600, 700, 800, and 900 °C. Under different processing conditions, Ta remains the valence of +5, while the valence of Rh varies. Rh exhibits Rh 3+ and Rh 4+ in the 450 °C crystallized samples and is completely oxidized to Rh 4+ in the 800 °C crystallized samples. In the reduced samples, Rh exists in the forms of Rh, Rh 3+ and Rh 4+ . The optimal photocatalyst is obtained as the ratio of Rh 3+ /Rh 4+ is 2.11 or the average valence of doped Ta and Rh is closest to the +4 valence of substituted Ti.
研究领域:
材料科学
·
化学
·
催化
✓ 已验证
产品关联
DOI
高影响因子
PROPELLANTS EXPLOSIVES PYROTECHNICS
·
2020
·Vol. 45
·期 3
·368-373
·
IF 1.544
Naimeng Song,Li Yang,Pingan Liu
In this study, the ultrasonic spray drying technology was applied to prepare composite microspheres of catalyst (Ta−Fe, Ph−Fe) and AP. The surface morphology of the two composite microspheres was characterized by scanning electron microscopy (SEM). Their particle size distribution characteristics were tested by a nano laser particle size analyzer. The results showed that the spray drying technology can uniformly compound the AP and the catalyst into spherical particles. The thermal decomposition process of Ta(Ph)-Fe/AP composite microspheres were tested by differential scanning calorimetry (DSC). The DSC data demonstrated that Ta(Ph)-Fe/AP composite microsphere had a very good catalytic effect and significantly promoted the thermal decomposition process of AP. In addition, the catalytic mechanism was discussed by calculating the change in activation energy. Compared with the raw AP, the activation energies of the Ta−Fe/AP and Ph−Fe/AP composite microspheres were reduced by 18.5 kJ/mol and 28.1 kJ/mol, respectively.
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
危险品化学品经营许可证（带存储）