JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2022
·
IF 6.364
Xiaomeng Li,Xian Xue,Qiyin Lin,Zeming Qi,Hong Wang,Yingying Zhao,Jing Guo
Temperature stable xLi 2 MoO 4 -(1-x)(LiBi) 0.5 MoO 4 (x = 0, 40, 50, 60, 70, 100 vol%) microwave dielectric ceramics obtained by cold sintering process (CSP) under a mild sintering condition (120 ℃/30 min/200 MPa) are introduced in this work. The XRD , SEM, and Raman analysis indicate the coexistence of Li 2 MoO 4 and (LiBi) 0.5 MoO 4 phases. Li 2 MoO 4 -(LiBi) 0.5 MoO 4 ceramics are compatible with Ag and Al electrode materials under cold sintering condition. The specimens exhibit high relative densities and good microwave dielectric properties (relative permittivities: 31.5–5.5; Q×f values: 1900 - 18,500 GHz; TCF values: from +144 ppm/℃ to −106 ppm/℃), in particular, TCF = +0.7 ppm/℃ can be obtained in the case of x = 50 vol%. The extrapolated microwave dielectric properties obtained by the fitted infrared reflectivity spectrum are close to the measured data, revealing that the dielectric responses of cold sintered Li 2 MoO 4 -(LiBi) 0.5 MoO 4 ceramics in the microwave range are dominated by the polar optical phonons.
研究领域:
材料科学
·
陶瓷
·
微波工程
·
固体物理
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2019
·
IF 3.45
Cheng Meng,Wenqi Li,Chunrong Ren,Junchuan Zhao
Powellite ceramic represent one candidate to immobilize minor actinides and Mo from reprocessed UMo nuclear fuel. In this work, the Ca 1-x Li x/2 Ce x/2 MoO 4 (0 ≤ x ≤ 1) series is prepared via a solid-state reaction using Ce 3+ as trivalent minor actinide (Am 3+ ) surrogate, with structure/microstructure characterized by XRD , XPS, HRTEM , and SEM as well. The Ca 1-x Li x/2 Ce x/2 MoO 4 (0 ≤ x ≤ 1) compositions crystallize in tetragonal and are isostructural with scheelite. Rietveld refinements show that Ce 3+ and Li + simultaneously enter into the eight-fold coordinated Ca site of powellite crystal. The chemical durability of powellite phases is evaluated by the ASTM C1285-14 product consistency test method B. The leaching behaviours of Ce and Mo are accordance with the interfacial dissolution-reprecipitation mechanism. For all the Ca 1-x Li x/2 Ce x/2 MoO 4 (0 ≤ x ≤ 1) ceramics, 7-days NL Ce and NL Mo are found to be in the order of 10 −3 -10 −5 g·m −2 and 10 −2 -10 −4 g·m −2 respectively, which exhibit the great retention of Ce and Mo. Interestingly, the values of 7-days NL Ce and NL Mo are predominantly controlled by the distortion of MoO 4 tetrahedra and disordered arrangements of Ce 3+ and Li + . Thus, our initial understanding on the structure and chemical durability relation will provide insight to design new waste forms for the Mo-rich HLW condition.
研究领域:
材料科学
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核废料管理
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陶瓷工程
·
化学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2023
·Vol. 332
·期 12
·5035-5043
·
IF 1.6
Li Lin,Qian Zhenghua,Zhang Hengrui,Duan Xilei,Liu Xueyang,Zhang Qiang,Qiao Yanbo
The porous compound generated from the reaction of 4-[tris(4-carboxyphenyl)methyl]benzoic acid (H4MTB) with actinide Th in simulated high-level radioactive waste can adsorb Ru, which can separate Th and Ru by more than 68.1 and 37.3%, respectively, in simulated high-level radioactive waste. The waste liquid before and after separation was vitrified with borosilicate glass and iron phosphate glass. The composition and morphology of the glasses were characterized by XRD, SEM and ICP‒OES, and the product consistency test was used to measure the chemical durability of the glasses. The chemical stability and waste loading of the glasses after the separation of actinide and noble metal elements was significantly improved. This work is of great significance for the recovery and utilization of actinide and noble metal elements in high-level radioactive waste and the optimization of the vitrification process of radioactive waste.
研究领域:
核化学
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放射性废物管理
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材料科学
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环境科学
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2020
·Vol. 31
·期 12
·9057-9064
·
IF 2.22
Zhao Jingkui,Liu Xiansong,Kan Xucai,Chen Zuhua,Liu Chaocheng,Wang Wei,Lv Qingrong,Huang Jingwen,Shazeda Mudssir
In this study, novel Ni–Cu–Zn ferrites with the chemical formula [Ni 0.6 Zn 0.4 ][Cu 0.2 Co x Fe 1.8− x ]O 4 ( x = 0, 0.05, 0.10, 0.15, 0.20, 0.25) doped with Co 2+ ions were designed and manufactured by standard solid-state reaction method. The magnetic properties, surface characteristics, and ion occupancy of ferrites were studied by X-ray powder diffraction (XRD), scanning electron microscopy (SEM), and vibrating sample magnetometer (VSM), and we explained the different mechanisms of the results and the relationship between magnetic properties and microstructures. For the obtained samples, cobalt ions entered the lattice, and all samples were characterized as spinel structures. As the doping amount of Co 2+ ions increases, the lattice constant and volume of the sample also increases. With an appropriate doping level, Co 2+ ions-doped Ni–Cu–Zn ferrites can maintain higher saturation magnetization, higher magnetic permeability, and lower hysteresis loss. When x ≤ 0.1, the saturation magnetization M s increases significantly as the doping amount of Co 2+ ions increases, but when x > 0.1, the value decreases. The experimental results show that the saturation magnetization value is 118.08 emu/g, the magnetic permeability value is 39.47 H/m, and the hysteresis loss is 1.192 mW/cm 3 at an optimum doping amount. Therefore, the sample achieves the best magnetic properties when the doping amount is 0.1.
研究领域:
材料科学
·
磁学
·
陶瓷学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
·
2021
·
IF 3.927
Yifan Liu,Yan Luo,Mingliang Li,Lixia Yang
A novel Bi 2 MoO 6 (BMO) modified g-C 3 N 4 heterostructure composite photocatalyst (g-C 3 N 4 /BMO) was prepared by hydrothermal method . The orthorhombic crystal phase of the material was studied by the X-ray diffraction assay (XRD). The microscopic morphology of the material was investigated by scanning electron microscopy (SEM) and transmission electron microscopy (TEM), indicating a heterojunction structure of the composite. The electrons and holes separation was evaluated by photo-luminescence (PL) and photocurrent measurements. The removal rate of O-Nitrophenol was as high as 97.3% over the catalyst with the optimal ratio of 1: 0.09 (BMO:g-C 3 N 4 ) in 180 min. COD removal percentage of actual pharmaceutical wastewater was as high as 71.40%. The active species in the photocatalytic system were studied, indicating superoxide radicals ( · O 2 - ) and holes (h + ) as the main active species.
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
CERAMICS INTERNATIONAL
·
2020
·
IF 3.83
Jinqing Chen,Wenqi Xie,Xiangguang Guo,Bin Huang,Yu Xiao,Xiaoqi Sun
In this paper, a series of high performance near-infrared reflective pigments based on Bi 3 YO 6 doped with Fe 2 O 3 and Tb 4 O 7 were prepared by high-temperature calcination method. The pigments were characterized by some analytic techniques, such as XRD , Particle size analyzer, SEM, EDS , UV–vis–NIR spectrophotometer, CIE L*a*b* (1976) color space and infrared thermal imaging. Experimental results showed that the Fe 2 O 3 doping in Bi 3 YO 6 could change the color from bright yellow to ochre red. The substitution of Tb (IV)-doped pigments changed the color to dark orange. The doping of Fe (III) and Tb (IV) contributed to enriching the color diversities of pigments. Among the synthesized pigments, Bi 3-x Fe x YO 6 and Bi 3 Y 1-x Tb x O 6+δ displayed a disordered defective fluorite-type structure. The effect of doping Fe (III) and Tb (IV) reduced the near-infrared reflectance of the pigment. Excepting for Bi 3-x Fe x YO 6 (x = 0.8), the near infrared reflectance of some other pigments were higher than the China National standard (CNs). Chemical resistance tests showed that the pigments had excellent acid and alkali resistance. Finally, the application practical of traditional iron oxide yellow pigment and three prepared pigments, i.e., Bi 3 YO 6 , Bi 3-x Fe x YO 6 (x = 0.4) and Bi 3 Y 1-x Tb x O 6+δ (x = 0.05) were studied and compared by infrared thermal imaging. The test results showed that Bi 3 YO 6 still had a strong near-infrared reflection effect after being painted. Compared with traditional iron yellow pigment, Bi 3 YO 6 could reduce the surface temperature of galvanized sheet by 20 °C under the illumination of infrared light. The series of Fe (III) and Tb (IV) doped pigments prepared in this paper have revealed some promising application values.
研究领域:
材料科学
·
化学
·
物理学
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2019
·Vol. 43
·期 43
·16981-16989
·
IF 3.069
Bingying Jia,Miaojiang Wu,Hua Zhang,Yi Zeng,Gongying Wang
Titanates are frequently used as precursors to prepare transesterification catalysts with TiIV species. Unfortunately, it is challenging to control the dispersity of TiIV active sites on supports. Herein, a series of TiIV species is anchored on abundant linker vacancy sites by introducing point and large scale defects in UiO-66(Zr/Ti) with hierarchical-pore structure. The catalyst functionalized by titanium(IV) oxide bis(2,4-pentanedionate) shows excellent catalytic performance in the transesterification of dimethyl carbonate with phenyl acetate. The catalysts are characterized by XRD, FT-IR, N2 adsorption–desorption, XPS, SEM and STEM-HAADF techniques. The results demonstrate that the delicate mesopores in the support can not only exhibit a large surface area for the distribution of the active sites, but also provide better mass transfer performance. Meanwhile, the introduction of octahedral TiIV ions raises the activity of the catalyst via more coordinatively unsaturated ZrIV sites. Furthermore, using titanium(IV) oxide bis(2,4-pentanedionate) as a Ti source can effectively prevent the condensation of tetrahedral TiIV species anchored on the hierarchical-pore UiO-66(Zr/Ti) support.
研究领域:
催化
·
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2022
·
IF 8.035
Xiaodong Wang,Xiaoran Li,Sen Liu,Haofei Zhou,Qiuye Li,Jianjun Yang
Cis-9-Octadecenylamine modified α-Fe 2 O 3 and Fe(OH) 3 nanoparticles were successfully synthesized by using a one-step synthetic method. XRD results revealed that lower ratio of oleylamine to Fe 3+ introduce forming hematite phase but higher ratio introduce forming Fe(OH) 3 phase. FTIR, TGA, contact angle, and XPS results indicated that olelyamine were modified on the surface of α-Fe 2 O 3 or Fe(OH) 3 . A larger amount of oleylamine modifier is conducive to the dispersion of the catalysts in heavy oil. Oleylamine modified Fe(OH) 3 can be transformed into α-Fe 2 O 3 in situ during the catalytic reaction and shows higher catalytic activity in the viscosity reduction of Shengli extra heavy crude oil.
研究领域:
化学工程
·
材料科学
·
石油工程
✓ 已验证
产品关联
DOI
高影响因子
RESEARCH ON CHEMICAL INTERMEDIATES
·
2022
·Vol. 49
·期 8
·3381-3393
·
IF 3.134
Yang Haoguo,Guo Yijun,Han Shitong,Xi Hailing,Lin Huaxiang,Yuan Rusheng,Ding Zhengxin,Long Jinlin,Lin Qun
Mustard gas is a kind of erosive poison with great harm and used as a chemical weapon since World War. It has suggested that the photocatalytic technology is an effective method to eliminate it. Because the small difference in molecular structure between 2-CEES and Mustard gas, and the less toxic of 2-CEES, 2-CEES is often used as a simulator to evaluate the photocatalytic activity of catalysts. In this work, symbiotic mixture of Bi 2 WO 6 and Bi 6 O 6 (OH) 3 (NO 3 ) 3 ·1.5H 2 O nanosheets doped with Mo (Mo-B-B) have been synthesized by a facile hydrothermal treatment. The samples were characterized by XRD, DRS, XPS, SEM, TEM, Raman, and PL. The photocatalytic activity of the samples was evaluated by measuring the degradation of 2-CEES under visible light irradiation. The results showed that the doped Mo reduce the Eg of bare symbiotic mixture and improve the separation efficiency of photo-generated carriers that is beneficial to photocatalytic activity. The optimum amount of doped Mo is 5% that exhibits the best activity for degradation for 2-CEES.
研究领域:
材料科学
·
环境科学
·
化学工程
·
纳米技术
·
光催化
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF PHYSICAL CHEMISTRY B
·
2025
·
IF 2.9
Haiyang Huang,Yong Zhou,Ling Xie,Bing Li,Wenlong Wang,Xinjuan Liu,Yongli Huang,Chang Q. Sun,Biao Wang
Hydrogels are versatile functional materials with applications in biomedical devices, sensors, and energy systems. However, tailoring their mechanical properties remains a critical challenge for expanding their practical utility. Here, the mechanical properties of poly(vinyl alcohol) (PVA) hydrogels prepared via the freeze–thaw method were effectively tailored through the incorporation of various chloride salts. This study reveals the molecular mechanisms by which salt ions influence the water structure, polymer chain interactions, and freezing behavior to modulate hydrogel performance. Using Raman spectroscopy, X-ray diffraction (XRD), and Fourier-transform infrared spectroscopy (FTIR), we elucidate how cation-specific effects alter the crystallinity, cross-linking density, and hydrogen bond network in the hydrogels. Hydrogels containing K+ exhibited superior rigidity and toughness due to enhanced crystallinity and optimized water–polymer interactions, while hydrogels of Mg2+ and Ca2+ had much lower modulus and adhesion strength since the divalent ions reduced freezing points resulting in reduced polymer aggregation. These findings provide a molecular-level understanding of the salting effects on hydrogel properties, offering new insights into designing materials with tunable mechanical performance for diverse applications.
研究领域:
材料科学
·
高分子科学
·
机械工程
·
生物医学工程
·
物理化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Jinshan Xie,Xiaoxiang He,Kexin Liu,Wulong Li,Zhanxiong Li
In this paper, carboxylated cotton fabric (CF-Ph-COOH) were obtained as active substrate by diazonium radical polymerization modification of cotton fibers. Then the MOF fabric composites were prepared by in situ growth of metal zirconium ions (Zr) and organic ligands on the surface of carboxylated cotton fabrics under carboxylic acid modifier. MOF fabric composites with controllable morphologies structures were achieved by regulating organic ligands, reaction time the type and dosage of regulator (formic acid and acetic acid). The prepared acetic acid regulated MOF fabric composites were designated as CF-HAc1-UiO-66, CF-HAc2-UiO-66, CF-HAc1-UiO-66-NH 2 , and CF-HAc2-UiO-66-NH 2 , respectively, and the formic acid regulated as CF-FA-UiO-66 and CF-FA-UiO-66-NH 2 . The fabricated carboxylic acid modulated MOF fabric composites were well characterized using SEM, TGA, XRD, FTIR, and XPS spectra. The adsorption experiment results show that carboxylic acid modulated Zr based MOF fabric composites can serve as adsorbent for effective removal of Cr(VI) from water, in which the CF-FA-UiO-66-NH 2 was prepared under the ratio of ZrCl 4 and BDC-NH 2 is 1.006 and with 5.47 M formic acid regulator exhibits that the optimal adsorption efficiency and the removal efficiency is 79.5 %. In addition, the adsorption of Cr(VI) in water by CFA-UiO-66-NH 2 showed a quasi-secondary kinetic model following the Langmuir adsorption model, showing a a typical of chemisorption. What’s more, the Cr(VI) removal efficiency and saturated adsorption capacity of CF-FA-UiO-66-NH 2 was up to 80 % and 318.85 mg/g, respectively. The prepared CF-FA-UiO-66-NH 2 MOF fabric composite was recyclable for removal of Cr(VI), and could be used as the potential adsorbent membrane for waste water treatment.
研究领域:
材料科学
·
环境工程
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2020
·Vol. 137
·期 45
·49414
·
IF 2.52
Yuntong Liu,Li Liu,Yongri Liang
In this work, we investigated the microphase separation, mechanical, and dynamic mechanical properties of thermoplastic polyurethane elastomers (TPUs) with one-soft segment (polypropylene glycol, PPG, or hydroxyl-terminated polybutadiene, HTPB) or bi-soft segment (PPG and HTPB) using FTIR, XRD, SAXS and amplitude modulated-frequency modulated viscoelastic mode of AFM (AM-FM mode AFM) methods. The results showed that the microphase separation process of hard and soft segments (HS and SS) in TPU containing PPG and HTPB soft segments (PPG-HTPB-PU) was restricted by randomly alternated bi-soft segments, which results in formation of a low content of irregular-shaped hard domain (HD). In addition, the microphase separation of PPG-HTPB-PU induced a triple-phased structure of HD, HTPB rich phase and mesophase. The mesophase of PPG-HTPB-PU was formed of HS, PPG and HTPB segments which were excluded out of HD and HPTB rich domains during microphase separation process. The damping temperature range (at tan δ greater than 0.3) of PPG-HTPB-PU was from −14.6 to 32.1°C (46.5°C) which was more broad than that of TPU containing HTPB soft segment (HTPB-PU). The broad damping temperature range of PPG-HTPB-PU is mainly attributed to the enhanced energy consumption caused by the frictional motions of mixed segments of mesophase.
研究领域:
材料科学
·
高分子科学
·
机械工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）