JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Yuxuan Ren,Junxian Wang,Yunfeng Guo,Di Li,Jiamao Li
The influences of Mo 6+ substitution at the B-site of scheelite structure on the sintering character, microstructures, lattice vibrational characteristics, and dielectric properties of BaW 1- x Mo x O 4 ( x = 0.10–0.30) ceramics were studied in detail in this paper. The sintering temperature of BaW 1- x Mo x O 4 ceramics was effectively reduced to less than 950 °C through forming a scheelite solid solution. The densification and the quality factor ( Q × f ) of BaW 1- x Mo x O 4 ceramics were also enhanced compared with pure BaWO 4 ceramic. Raman spectroscopy confirmed that the dielectric constant (ε r ) was highly correlated with molecular polarizability, and the Q × f was strongly dependent on the symmetric stretching bond of [WO 4 ] tetrahedron. Oxygen bond valence was one of crucial parameters for modulating the temperature coefficient of resonant frequency (τ f ). Interestingly, the BaW 0.75 Mo 0.25 O 4 ceramic sintered at 910 °C exhibited favorable microwave dielectric properties of ε r = 9.44, Q × f = 46,820 GHz (@12.5 GHz), and τ f = −69.2 ppm/°C. Meanwhile, the BaW 0.75 Mo 0.25 O 4 ceramic had stupendous dielectric properties in low-frequency band: ε r = 17.5 and dielectric loss (tan δ ) = 2.2×10 −4 (@10 MHz). In addition, there was good chemical compatibility between BaW 0.75 Mo 0.25 O 4 ceramic and silver electrodes. These findings evidence that BaW 1- x Mo x O 4 ceramics are competitive candidates in LTCC technology.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2017
·
IF 3.133
Yuling Ma,Xiaojing Li,Yun Zhang,Li Chen,Jiangtao Wu,Daojiang Gao,Jian Bi,Guangyin Fan
The release of hydrogen from chemical hydrides is of significant importance for practical applications. In this study, Ru nanoparticles supported on TiO 2 (B) nanotubes , designated as Ru/TiO 2 (B), were synthesized and applied as catalysts for hydrogen evolution from the catalytic hydrolysis of ammonia borane (AB) at 25 °C. Results indicate that Ru/TiO 2 (B) shows high catalytic activity in hydrogen evolution from the hydrolysis of AB with an activation energy of 45.6 kJ mol −1 and a turnover frequency number of 303 mol H 2 ·(mol Ru·min) −1 . The Ru/TiO 2 (B) exhibits a total turnover number of 15,377 in catalytic lifetime measurement in hydrogen generation from the hydrolysis of AB before deactivation. The kinetic studies show that the hydrolysis of AB catalyzed by Ru/TiO 2 (B) is a first-order reaction with respect to Ru concentration, whereas it is a zero-order reaction regarding the AB concentration. The high catalytic activity of Ru/TiO 2 (B) demonstrates that TiO 2 (B) nanotubes are suitable media for nanoparticle immobilization.
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INORGANIC CHEMISTRY
·
2020
·
IF 4.825
Ji Wu,Ke Cao,Cai-Yan Zhang,Tao-Tao Xu,Xin-Yu Wen,Bo Li,Junxiao Yang
A palladium catalyzed selective B(3)–H activation/oxidative dehydrogenative coupling for the synthesis of bis(o-carborane)s connected with B(3)–B(3′) and B(3)–B(6′) bonds has been developed for the first time. A plausible mechanism involving stepwise activation of B(3)–H and B(3′/6′)–H bonds by PdII and PdIV was proposed. This work is the first example and the most efficient protocol for synthesis of bis(o-carborane)s connected with B(3)–B(3′) and B(3)–B(6′) bonds, which has important reference for design, synthesis, and application of bis(o-carborane)s in related fields.
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JOURNAL OF ORGANIC CHEMISTRY
·
2024
·
IF 3.3
Wei-Wei Zhang,Qiang Sha
An efficient B(C6F5)3-catalyzed multicomponent reaction of 2,3-diketoesters, amines, allenes, and nucleophiles was reported, which afforded 2α-functionalized pyrroles in moderate to good yields. The reaction features low catalyst loading, usage of a small amount of solvent, high atom economy, tunable installation of diverse functional groups at 2α-position, and water being formed as the byproduct. This is the first multicomponent reaction that combines vicinal tricarbonyl compounds with allenes.
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Food Additives and Contaminants Part A-Chemistry Analysis Control Exposure & Risk Assessment
·
2019
·
IF 2.17
Junqiang Hu,Hui Lv,Mingxuan Hou,Gang Wang,Yin-Won Lee,Jianrong Shi,Zhenxin Gu,Jianhong Xu
B-type fumonisins (FBs) are water-soluble mycotoxins produced by Fusarium species, which are mainly found in maize products and threaten food safety. Toxicological studies and quantitative determinations of fumonisins require large amounts of pure toxins, and their high prices limit progress in FBs research. In this study, we used a macroporous resin column combined with high-speed countercurrent chromatography to separate large quantities of FBs. A fermented rice culture was extracted with 75% methanol. The dynamic adsorption capacity of FBs on XAD-2 resin was 27.5 mg/g resin at 25°C, pH 4.0, and then the FBs were desorbed with 60% methanol. The crude FBs were further purified using a biphasic system consisting of n-heptane/n-butanol/methanol/water (2:4:1:4, v/v/v/v). The method yielded 1.55 g of FB1 and 0.55 g of FB3 with purities of 96.8% and 95.6%, respectively, from 1 kg of rice culture, and the final overall yield of FBs was 74.8%.
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Journal of Environmental Chemical Engineering
·
2022
·
IF 7.968
Hongji Li,Dongze Li,Junfu Wang,Haochen Yu,Chengsi Huang,Wei Jiang,Chunbo Liu,Guangbo Che,Dandan Wang
In this work, a novel imprinted sensor based on Ag-modified composite metal organic Frameworks (MOFs) was synthesized for selective detection to Rhodamine B (RhB) in river. UIO-66(NH 2 ) was firstly dispersed on the surface of ZIF-8 with the assistance of PVP, and Ag nanoparticles were dispersed on the surface by in-situ reduction. The ZIF-8/UIO-66(NH 2 )/Ag-MIPs (AZU-MIPs) were synthesized by the process of precipitation polymerization. It was proved from the analysis results that AZU-MIPs presented sensitive and selective detection property to RhB. Furthermore, AZU-MIPs also presented stability and repeatability property during the practical samples detection. There was an obvious linear relationship between concentration and Raman intensity when the concentration of RhB changed between 10 −6 M and 5 × 10 −11 M. The detection of limit (LOD) was 5 × 10 −11 M, and the correlation coefficient (R 2 ) was 0.9984. It could be considered that the novel imprinted sensor presented a promising candidate for Rhodamine B and other organic fluorescent dye detection in the river, and this work also provided an application prospect to the monitor of water environment.
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Systems Microbiology and Biomanufacturing
·
2023
·
IF 0
Li Xuemei,Zhang Rui,Li Jianjiong,Feng Jinhui,Wu Qiaqing,Zhu Dunming,Ma Yanhe
Cholesterol and phytosterols can be served as the substrates for Actinobacteria to produce the precursors used in the synthesis of steroidal medicines. Cytochrome P450s from CYP125 and CYP142 families initiates the metabolism of cholesterol and/or phytosterols. In this study, we demonstrate the functional redundancy and substrate preference of five cytochrome CYP125s and CYP142s by the unmarked cyp genes deletion strains of Mycobacterium neoaurum NRRL B-3805. CYP125-3 was found to be responsible for the catalytic hydroxylation of both cholesterol and the C24-branched side-chains of phytosterols, while CYP142-2 can only oxidize cholesterol and/or cholest-4-en-3-one. The strain harboring the CYP125-3 produced 6.47 g l − 1 and 5.13 g l − 1 of 4-androstene-3,17-dione (AD) when 15 g l − 1 cholesterol or 17.5 g l − 1 phytosterols used, respectively. While, the strain harboring the CYP142-2 produced 7.10 g l − 1 AD when 15 g l − 1 cholesterol used. The other three cytochrome P450s have a smaller contribution for the degradation of cholesterol and phytosterols. CYP125-3 has the hydroxylation activity on more substrates than that of CYP142-2. This study provided possible guidance to improve the efficiency of AD and other metabolites production from different kinds of sterols by the genetic manipulation.
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NEW JOURNAL OF CHEMISTRY
·
2024
·Vol. 48
·期 46
·19700-19707
·
IF 2.7
Nan Zhou,Fanyi Kong,Ya Tang
The traditional impregnation method for preparing supported catalysts often faces challenges such as particle agglomeration and weak support–metal interactions. This study focuses on utilizing the exsolution method to prepare Fe, Co, and Ni supported catalysts from ABO3-type perovskites, aiming to overcome these challenges. Experimental results show that LaBO3 perovskites with different B site metals (B = Fe, Co, Ni) exhibit different metal exsolution kinetics in the ammonia synthesis reaction. LaNiO3 demonstrates an initial activity of 782.2 μmol g−1 h−1 within the first 2 hours of the reaction, maintaining stability beyond 80 hours. In contrast, LaFeO3 and LaCoO3 exhibit prolonged initiation periods for the metal exsolution process, reaching activities of 7873.8 μmol g−1 h−1 and 8046.7 μmol g−1 h−1, respectively, after approximately 80 hours. The degree of B-site metal exsolution was investigated using X-ray absorption fine structure (XAFS) and Rietveld refinement of XRD data, revealing exsolution rates of 72.03%, 69.3%, and 86.3% for Fe, Co, and Ni, respectively, after 80 hours of reaction. This study not only introduces the exsolution method for ammonia synthesis but also empirically validates several computational predictions, thereby supporting both theoretical and practical research.
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CHEMISTRY OF MATERIALS
·
2024
·
IF 7.2
Zhongxiong Sun,Jinjin Yang,Yifeng Han,Man-Rong Li
Harsh synthetic conditions and high cost seriously hinder the discoveries of metastable materials under extreme conditions. Extending the big-data-driven high-throughput calculation (HTC) to depict the chemically negative pressure (NP) zone enables the creation of efficient and accurate prediction models over the full pressure range. This approach significantly expedites the exploration and discovery of novel multifunctional metastable materials. Here, double perovskites Ag2B(IV)B′(VI)O6 were adopted to illustrate the comprehensive process of big-data-mining, HTC, and experimental realization under chemically NP. High-throughput screening of 32 Ag2BB′O6 compounds, encompassing 9 possible crystal structures and 23 derived magnetic structures, resulting in 1024 potential candidates. Ag2MnTeO6 (AMTO) and Ag2TiTeO6 (ATTO) were selected for the experimental validation. We captured a new polymorph of AMTO (R-3, 3R) at ambient pressure through ion-exchange reaction, a phase theoretically predicted to be stable under NP about −6.6 GPa. Moreover, as predicted by density functional theory calculations, the P-31c (2H) AMTO is an antiferromagnetic semiconductor with magnetic transition at 3 K and direct band gap ∼0.97 eV. This work is expected to guide the exploration of hidden metastable phase by providing a methodological framework and novel conceptual approach for future research.
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PARTICLE & PARTICLE SYSTEMS CHARACTERIZATION
·
2016
·Vol. 33
·期 7
·388-395
·
IF 4.367
Wenbin Wang,Liqiang Liu,Liguang Xu,Hua Kuang,Jianping Zhu,Chuanlai Xu
Staphylococcal enterotoxins (SEs) in food samples can cause severe gastroenteritis even at low doses. Detection of SEs with a single assay would not only improve reliability and portability, but would also save time. In this paper, for the first time, a multiplexed gold-nanoparticle-based immunochromatographic (ICT) strip that allows the simultaneous detection of the five main SEs has been reported: SEA, SEB, SEC, SED, and SEE. Based on the sandwich immunoassay of each SE, a multiplexed ICT strip with five test lines is developed. Sensitive and specific paired monoclonal antibodies facilitate the detection, allowing for high sensitivity and good specificity. The portable biosensor platform can simultaneously detect SEA, SEB, SEC, SED, and SEE at concentrations as low as 2.5, 2.5, 2.5, 1, and 5 ng mL −1 , respectively. The entire test can be performed within 15 min and requires no sophisticated instruments except a portable strip reader. To evaluate the multiplexed strip, naturally SEA and SEC contaminated milk samples and pure milk samples spiked with the five SEs are analyzed.
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ACS Applied Materials & Interfaces
·
2016
·
IF 7.145
Shuojian Su,Yanna NuLi,Zhenguo Huang,Qi Miao,Jun Yang,Jiulin Wang
Mg2+/Li+ hybrid batteries have recently been constructed combining a Mg anode, a Li+-intercalation electrode, and an electrolyte containing both Mg2+ and Li+. These batteries have been reported to outperform all the previously reported magnesium batteries in terms of specific capacity, cycling stability, and rate capability. Herein, we report the outstanding electrochemical performance of Mg2+/Li+ hybrid batteries consisting of a one-dimensional mesoporous TiO2(B) cathode, a Mg anode, and an electrolyte consisting of 0.5 mol L–1 Mg(BH4)2 + 1.5 mol L–1 LiBH4 in tetraglyme. A highly synergetic interaction between Li+ and Mg2+ ions toward the pseudo-capacitive reaction is proposed. The hybrid batteries show superior rate performance with 130 mAh g–1 at 1 C and 115 mAh g–1 at 2 C, together with excellent cyclability up to 6000 cycles.
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ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Weicai Liu,Hui Zong,Mengshu Li,Ziquan Zeng,Shijing Gong,Ke Yu,Ziqiang Zhu
A two-dimensional MXene (Ta4C3) was innovatively used herein to modulate the space group and electronic properties of vanadium oxides, and the MXene/metal–organic framework (MOF) derivative VO2(B)@Ta4C3 with 3D network cross-linking was prepared, which was then employed as a cathode to improve the performance of aqueous zinc ion batteries (ZIBs). A novel method combining HCl/LiF and hydrothermal treatments was used to etch Ta4AlC3 to obtain a large amount of accordion-like Ta4C3, and the V-MOF was then hydrothermally grown on the surface of the stripped Ta4C3 MXene. During the annealing process of V-MOF@Ta4C3, the addition of Ta4C3 MXene liberates the V-MOF from agglomerative stacking, allowing it to show additional active sites. More significantly, Ta4C3 prevents the V-MOF in the composite structure from converting into V2O5 of space group Pmmn but into VO2(B) of space group C2/m after annealing. A considerable advantage of VO2(B) for Zn2+ intercalation is provided by the negligible structural transformation during the intercalation process and the special tunnel transport channels, which have an enormous area (0.82 nm2 along the b axis). According to first-principles calculations, there is a strong interfacial interaction between VO2(B) and Ta4C3, which deliver remarkable electrochemical activity and kinetic performances for the storage of Zn2+. Therefore, the ZIBs prepared with the VO2(B)@Ta4C3 cathode material exhibit an ultra-high capacity of 437 mA h·g–1 at 0.1 A·g–1 while showing good cycle performance and dynamic performance. This study will offer a fresh approach and a reference for creating metal oxide/MXene composite structures.
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