MICROPOROUS AND MESOPOROUS MATERIALS
·
2020
·
IF 4.551
Yaorui Li,Adede Ochieng Simon,Caishan Jiao,Meng Zhang,Wenfu Yan,Heng Rao,Jiancong Liu,Jianan Zhang
In this study, a new and efficient sorbent material was developed by the surface modification of zeolite Y with surfactant of cetyltrimethyl ammonium bromide (CTAB) and amino acid of l -aspartic acid (Asp) for rapid removal of Sr 2+ , Cs + and UO 2 2+ in solution. The as-synthesized and modified zeolite Y were characterized by powder X-ray diffraction (XRD), scanning electron microscope (SEM), thermogravimetric analysis (TGA), Fourier transform infrared spectroscopy (FTIR) and nitrogen adsorption-desorption analysis. The results showed that after first grafting the cations of CTAB on the external surface of zeolite Y crystals, negatively charged Asp was then successfully introduced onto zeolite to form the CTAB + Asp dually modified zeolite Y sorbent . The fraction of CTAB and Asp in dually modified zeolite Y is 9.6 wt % and 16.3 wt %, respectively. The sorption isotherm of UO 2 2+ , Sr 2+ and Cs + by such sorbent was better fitted by Langmuir model. The CTAB + Asp dually modified zeolite Y took 20 min to reach the maximum sorption amount, while the unmodified zeolite Y took 240 min. This encouraging result provides a new concept to design sorbent materials for rapid removal of radionuclides from contaminated water system in an emergency.
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DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2018
·
IF 13.325
Li Jing,Yin Ruiming
In this study, self-reinforced Y-α-SiAlON was prepared by two-step phase transformation using single or dual rare-earth oxide addition. The process was implemented by a two-step sintering technique. The mechanism of two-step phase transformation and microstructure evolution of Y-α-SiAlON with or without Ce 2 O 3 addition were investigated in detail. The predominant phase of the sample after the first step (i.e., pressureless sintering at low temperature) comprised elongated β-SiAlON grains. By contrast, the majority phase of sample after the second step (i.e., gas pressure sintering at high temperature) included coarse, elongated α-SiAlON grains. The driving force for β-to-α SiAlON phase transformation and liquid viscosity decreased, whereas the amount of liquid phase increased because of Ce 2 O 3 addition, which contributed to anisotropic growth and resulted in more elongated α-SiAlON grains. The sample co-doped with Y and Ce exhibited the best mechanical properties with fracture toughness of 7.8 MPa m 1/2 and Vickers hardness of 19.81 GPa.
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高影响因子
CERAMICS INTERNATIONAL
·
2022
·Vol. 48
·期 6
·8773-8778
·
IF 5.532
Xin Kang,Xiaohui Li,Xiaoyi Chen,Bo Gao,Pengjun Zhao,Zhaoyang Chen,Wenwen Kong,Aimin Chang
In this study, a series of novel negative temperature coefficient thermistor materials based on A 2 Ti 2 O 7 ( A = Sm, Eu, Y) titanate ceramics have been developed for high-temperature applications. The A 2 Ti 2 O 7 ( A = Sm, Eu, Y) ceramics showed cubic pyrochlore structures with dense morphology in X-ray diffraction and scanning electron microscopic analyses. These ceramics showed typical NTC characteristics in a wide temperature range of 673–1473 K, accompanied by resistance drift rates of 2.71%, 1.63%, and 4.95% for 400 h of ageing at 1173 K. The proposed ceramics have high resistivity and thermal constants B that ensure their better sensitivity at high temperatures and also show unique oxygen insensitivity. These properties outperform those of traditional high-temperature NTC materials composed of perovskite-type or scheelite-type ceramics, making A 2 Ti 2 O 7 ( A = Sm, Eu, Y) ceramics promising candidates for fabricating high-temperature NTC thermistors.
研究领域:
材料科学
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陶瓷
·
电子材料
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热电材料
·
固态物理
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高影响因子
CERAMICS INTERNATIONAL
·
2020
·Vol. 47
·期 4
·4831-4837
·
IF 3.83
Yu Wang,Ying Tang,Jie Li,Weishuang Fang,Shiyao Shen,Feihu Li,Lian Duan,Ming Qin,Liang Fang
The Ca 3 M 2 Si 3 O 12 (M = Yb, Y) ceramics with orthorhombic silico-carnotite structure were fabricated via high-energy ball milling and solid-state reaction route. Dense Ca 3 Yb 2 Si 3 O 12 and Ca 3 Y 2 Si 3 O 12 ceramics sintered at 1260 °C and 1240 °C revealed promising microwave dielectric properties with ε r = 9.2 and 8.7, Q×f = 56,400 GHz and 29,094 GHz, τ f = −77.5 ppm/°C and −76.8 ppm/°C, respectively. The connection between crystal structure and Q×f values of Ca 3 M 2 Si 3 O 12 (M = Yb, Y) ceramics was discussed with respect to the packing fraction, and their intrinsic microwave dielectric properties were examined using the infrared reflectivity spectra analysis. The thermal stability of Ca 3 Yb 2 Si 3 O 12 was improved successfully by forming 0.91Ca 3 Yb 2 Si 3 O 12 ‐0.09CaTiO 3 composite ceramics with τ f = +2.9 ppm/°C, ε r = 12.93 and Q×f = 26,729 GHz.
研究领域:
材料科学
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陶瓷
·
微波材料
·
固态化学
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DOI
高影响因子
Journal of Materials Chemistry A
·
2024
·Vol. 12
·期 21
·12599-12608
·
IF 10.7
Yiming Yang,Jiachen Lu,Xinyu Zhang,Yanuo Shi,Peng Du,Xiao Ling,Nan Yang,Qianli Chen
Y-doped Ba(Zr,Ce)O3 (BZCY) proton conducting ceramics have attracted extensive attention because of their promising applications as electrolytes for intermediate-temperature proton ceramic electrochemical cells. The proton conductivity of BZCY is governed by their lattice volume and crystal symmetry; however, systematic studies of the competition between these two factors are lacking, hindering further improvement of their proton conductivity at low and intermediate temperatures. In this work, the crystal symmetry of BZCY epitaxial films deposited on NdGaO3 (110) is compared to that of polycrystalline bulk BZCY based on Raman spectra. The Raman signal of BZCY epitaxial films is amplified using surface-enhanced Raman spectroscopy and subsequently extracted utilizing the nonnegative matrix factorization method. The relative Raman intensity ratio of the BO6 octahedra motion to the Ba-BO6 relative motion in the ABO3 structure indicates that as the Ce content increases, the crystal symmetry of polycrystalline bulk BZCY decreases, whereas that of the epitaxial films on NdGaO3 remains consistently lower compared to bulk BZCY. The relationship between the activation energy and relative Raman intensity of epitaxial films and bulk BZCY indicates quantitatively that higher activation energy is observed in the crystal structure with lower symmetry. This work suggests that crystal symmetry has a predominant effect on the activation energy of BZCY. The results provide a deeper insight for developing proton conducting electrolyte membranes with high proton conductivity and low activation energy.
研究领域:
材料科学
·
固体离子学
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光谱学
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能源材料
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陶瓷电解质
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高影响因子
Polymers
·
2022
·Vol. 14
·期 21
·4494
·
IF 4.967
Wanming Teng,Yanyan Li,Ting Ma,Xiuyun Ren,Ding Nan,Jun Liu,Xiaohu Wang,Qin Yang,Jiaojiao Deng
Lithium metal batteries are emerging as the next generation of high-density electrochemical energy storage systems because of the ultra-high specific capacity and ultra-low electrochemical potential of the Li metal anode. However, the uneven Li deposition on commercial Cu current collectors result in low Coulombic efficiencies (CEs) and poor cycle life. In this research, we proposed the modification of ZnFx(OH)yon Cu foils to expand the lifespan. As-generated ZnLi alloy and LiF could promote uniform Li nucleation and deposition, thus resulting in an improved Li plating/stripping CE and extended cycle life. The Li-S battery with sulfurized polyacrylonitrile cathode and Li-ZnFx(OH)y@Cu anode (N/P ratio of 1.5:1) maintains 95% capacity after 60 cycles, proving the feasibility of ZnFx(OH)y@Cu for practical applications.
研究领域:
储能
·
电化学
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材料科学
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电池技术
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DOI
高影响因子
Catalysts
·
2025
·Vol. 15
·期 11
·1005
·
IF 4
Kuo Zhou,Jialin Xu,Shengrong Guo,Hongjun Wu
The catalytic synthesis of 1,2-pentanediol from biomass-derived feedstocks is of remarkable significance for addressing current environmental challenges and energy crises. In this paper, a series of Pt-based catalysts were prepared and evaluated in the hydrogenolysis of furfuryl alcohol. The 5Pt0.5Y/MgO provided a 1,2-pentanediol yield of 68.9% and a tetrahydrofurfuryl alcohol yield of 19.8% with 98.1% conversion of furfuryl alcohol, at 200 °C and 2 MPa H2for 10 h. The promotional effect of yttrium on the catalytic performance was investigated through catalytic reaction and comprehensive characterization. It was found that the reducibility of Pt species was suppressed by the introduction of Y species, resulting in reduced activity compared to the 5Pt/MgO catalyst. However, the addition of Y notably shifted the reaction pathway towards 1,2-pentanediol formation at the expense of tetrahydrofurfuryl alcohol selectivity. This increase in 1,2-pentanediol selectivity was attributed to a higher concentration of medium-strength basic sites on the Y-modified Pt catalyst. Furthermore, the strong interaction between Y2O3, Pt particles, and the MgO support led to high Pt dispersion and stability on the MgO surface, consequently yielding satisfactory recyclability.
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产品关联
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高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Xinlei Shen,Chun Tong,Haikui Zhu,Yigang Qian,Lixi Wang
(1- y )Ca 0.97 Sr 0.03 B 2 O 4 - y TiO 2 composite ceramics were produced through a solid-phase reaction procedure, ensuring that all samples had a uniform and dense microstructure, where each constituent phase exhibited complete crystallinity. Their crystal structures, microwave dielectric properties, microstructures, and co-sintering performance at low temperatures were thoroughly investigated. To enhance the thermal stability of the resonant frequency, rutile TiO 2 ( τ f = +450 ppm/°C) was introduced as an additional phase during the preparation of the composite ceramics. According to the XRD analysis, the characteristic peak signals became more pronounced as the content of rutile TiO 2 in the composite gradually rose, and the peak intensity was found to vary linearly with the relative content of TiO 2 . SEM analysis revealed that the TiO 2 additions ( y = 0.05, 0.10, and 0.15) resulted in tightly arranged grains, the absence of visible pores, and a high degree of densification. However, as the TiO 2 content increased ( y = 0.20, 0.25), pores appeared, grain boundaries became more pronounced, and densification decreased. At y = 0.15 and a sintering temperature of 900 °C, the best dielectric properties were achieved for the (1- y )Ca 0.97 Sr 0.03 B 2 O 4 - y TiO 2 composite ceramics: ε r = 7.61, Q×f = 33,983 GHz, and τ f = +3.51 ppm/°C. By introducing TiO 2 , the initially negative τ f was effectively adjusted toward zero, thereby achieving greater thermal reliability. Additionally, the absence of interfacial chemical reactions between the composite ceramic and the silver after co-firing indicates that the material possesses favorable chemical compatibility with silver, demonstrating strong applicability in LTCC technology.
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高影响因子
ELECTROANALYSIS
·
2019
·Vol. 32
·期 3
·598-605
·
IF 2.691
Xuan Cai,Qianmei Gao,Shaohua Zuo,Hongli Zhao,Minbo Lan
Here we established a palm-sized electrochemical sensor for the determination of cell-released superoxide anions (O 2 .− ) based on a self-developed portable potentiostat (xenSTAT) which can perform fast analysis with visual real-time data and customizable parameters. The xenSTAT was equipped with Bluetooth and USB interfaces, thus being able to be connected with both smartphones and computers for electrochemical analysis. A novel Nanozyme based on Mn x (PO 4 ) y monolayer modified porous carbon cubic was synthesized and used as functional material on the surface of working electrode. By using cyclic voltammetry (CV) and chronoamperometry, xenSTAT was demonstrated to exhibit satisfying sensitivity and excellent stability for real-time monitoring of O 2 .− released from cancer cells. With decreased cost, customizable development, small size and convenient usage, the xenSTAT described in this work could promote the commercialization and widespread of in-house built electrochemical sensors for the monitoring of O 2 .− in the future.
研究领域:
分析化学
·
生物医学工程
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电化学
·
细胞生物学
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高影响因子
Inorganic Chemistry Frontiers
·
2023
·Vol. 10
·期 23
·6869-6878
·
IF 7
Jinmiao Jiao,Conggang Li,Yuheng She,Ning Ye,Zhanggui Hu,Yicheng Wu
Nonlinear optical (NLO) materials currently attract significant interest and hold paramount importance in the optoelectronic field. Nevertheless, the fabrication of NLO crystals capable of transmitting ultraviolet to mid-infrared wavelengths remains a formidable challenge. Herein, we synthesized two novel NLO crystals, namely Cs3REGe3O9 (RE = Y, Gd), by employing a structural gene strategy that harmoniously merges flexible [YO6] and [GdO6] octahedra with rigid [GeO4] motifs. Remarkably, Cs3REGe3O9 (RE = Y, Gd) crystals exhibit substantial band gaps of 4.92 and 5.3 eV, respectively, while achieving the shortest reported ultraviolet cutoff edges at 210 and 215 nm among the boron-free germanate-based NLO materials. Importantly, these compounds also feature a remarkably broad infrared transparency range exceeding 6.8 μm. Furthermore, both compounds demonstrate a moderate second-harmonic-generation (SHG) response, comparable to that observed in KDP. Additionally, first-principles calculations unveil that the synergistic effect of the [REO6] octahedra and [GeO4] tetrahedra plays a pivotal role in governing the optical properties of Cs3REGe3O9 (RE = Y, Gd). These explored findings offer a novel avenue for leveraging the highly desired NLO materials in the region spanning from ultraviolet to mid-infrared wavelengths.
研究领域:
材料科学
·
光学工程
·
晶体化学
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DOI
高影响因子
Journal of Energy Storage
·
2023
·
IF 9.4
Hui Yong,Yiwan Chen,Yanquan Ji,Shuai Wang,Jiangwei Ma,Baosheng Liu,Jifan Hu,Yanghuan Zhang
Solid-state magnesium-based hydrogen storage encounters challenges associated with sluggish hydrogen absorption and desorption kinetics. The incorporation of catalysts is considered a promising means to improve the hydrogen absorption and desorption kinetics of these alloys. In this experiment, we prepared the Mg 80 Ni 15 Y 5 alloy via vacuum melting and incorporated TiF 3 in varying weight percentages of 1, 3, 5, and 7 wt% through ball milling . The phase composition and microstructure of the samples were analyzed and measured using X-ray diffraction meter (XRD), Transmission Electron Microscope (TEM), Selected Area Electron Diffraction (SAED), and Scanning Electron Microscope (SEM) techniques. The results revealed that the TiF 3 introduced two catalytically phases, MgF and TiF 2 . And TiF 2 transforms into TiH 2 after hydrogen absorption, which covers the surface of MgH 2 and prolongs the nucleation time of MgH 2 .Furthermore, the addition of TiF 3 made the surface of alloy markedly coarser and more irregular and few cracks, providing channels for hydrogen diffusion. This behavior optimized the kinetic performance of the alloy. It was observed that the samples containing 7 wt%TiF 3 achieved 99.2 % hydrogen saturation even in low-temperature. It's worth mentioning that the addition of 7 wt% TiF 3 to the Mg 80 Ni 15 Y 5 alloy significantly reduced the dehydrogenation activation energy to 58.5 kJ/mol, as opposed to pure magnesium with an activation energy of 158.2 kJ/mol. This substantial reduction has effectively accelerated the hydrogen absorption and desorption rates of the alloy. However, it had only a negligible impact on the thermodynamic properties of the sample with 7 wt%TiF 3 .
研究领域:
材料科学
·
能源储存
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Kaichen Qian,Jiantai Fan,Zongyun Shen,Lulu Zhang,Xianglong Fan,Tao Feng,Weiwen Zhou,Minghui Feng,Benxue Jiang,Long Zhang
A citrate-nitrate combustion method was applied to synthesize fine composite Gd 2-x Y x O 3 -MgO (x = 0, 0.02, 0.2, 0.3, 0.4, 0.6) nanopowders . Y 2 O 3 substitution inhibited Gd 2 O 3 phase transition from cubic structure to monoclinic structure during sintering, thereby stabilizing its cubic structure to room temperature. This approach led to nanocomposite ceramics with a grain size of about 190 nm and increased the transmittance to 85% over the 3–5 μm wavelength range when x = 0.3. However, the addition of Y 2 O 3 weakened the mechanic properties of the nanocomposite ceramics.
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）