CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Lei Zhang,Xuefeng Zhang,Chaoyong Zhao,Xuan Xiao
Eu 3+ -activated Sr 3 −x Ca x La(VO 4 ) 3 phosphors were fabricated via citric-acid-assisted sol combustion. Characterization of the Sr 3 −x Ca x La(VO 4 ) 3 :Eu 3+ samples with different concentrations of Ca 2+ revealed a hexagonal crystal structure belonging to the R -3 m space group. The amount of Ca 2+ added ( x ) was controlled within 0 ≤ x ≤ 2 to yield high-purity phosphors. Scanning electron microscopy results showed that an increase in Ca 2+ concentration resulted in a decrease in the particle size of Sr 3 −x Ca x La(VO 4 ) 3 :Eu 3+ , with the shape gradually changing from nearly equiaxed to lath-shaped. The Sr 2 CaLa(VO 4 ) 3 :Eu 3+ phosphor (denoted as SCLVO:Eu 3+ ) exhibited the strongest photoluminescence (PL) intensity at 618 nm among the samples under excitation of 394-nm near-UV (NUV) light. The study of Eu 3+ doping concentration confirmed that Eu 3+ could enter the lattice of the SCLVO matrix without altering its crystal structure. SCLVO:Eu 3+ was found to strongly absorb 394 nm NUV light and 464 nm blue light. The optimal concentration of the Eu 3+ dopant in the SCLVO host was 0.11, which resulted in the phosphor achieving an excellent PL intensity and a color purity of 98.68%. Tunable luminescence from the orange area (0.5280, 0.4522) of Commission Internationale de l'éclairage (CIE) to the red area (0.6313, 0.3650) was achieved by adjusting the concentration of Eu 3+ . Under 394 nm excitation, SCLVO:0.11Eu 3+ phosphor has a quantum yield (QY) of 28.2% and excellent thermal stability with 0.383 eV activation energy . Consequently, White-light-emitting diode (WLED) based on SCLVO:0.11Eu 3+ phosphor yielded a high color rendering index (CRI), low correlated color temperature (CCT), and CIE coordinates of 91.8, 5196 K, and (0.3407, 0.3612), respectively, under the 20 mA driven current. These results indicated the tremendous potential of SCLVO:0.11Eu 3+ phosphors for application in WLEDs excited by NUV or blue light.
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JOURNAL OF FLUORESCENCE
·
2013
·Vol. 23
·期 5
·989-996
·
IF 1.789
Liu Shikun,Zhang Lili,Gao Jigang,Zhou Jie
A novel probe, 3′,6′ - bis(diethylamino) -2- ((2,4-dimethoxybenzylidene)amino) spiro [isoindoline-1,9′-xanthene]-3-thione (RBS), was designed and synthesized. Its structure was characterized with elemental analysis, IR spectra and 1 H NMR. The probe displayed highly selective and sensitive recognition of Hg 2+ . Reacting with mercury ions in aqueous solution, its fluorescence intensity was enhanced significantly, while its color was changed from colorless to pink. So, a new fluorescence method of detection of Hg 2+ was proposed. Its dynamic response concentration range and detection limit for Hg 2+ were 5.00 × 10 −9 M to 1.00 × 10 −6 M detected and 1.83 × 10 −9 M, respectively. Satisfying results were obtained when the probe was applied to detect spiked Hg 2+ in samples.
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高影响因子
CERAMICS INTERNATIONAL
·
2016
·
IF 2.758
Youren Dong,Shangshu Qian,Lianyi Shao,Haoxiang Yu,Lei Yan,Peng Li,Xiaoting Lin,Nengbing Long,Miao Shui,Jie Shu
A series of Li 3− x Na x V 2 (PO 4 ) 3 /C (0≤ x ≤3) materials are successfully prepared by a simple solid-state reaction method and used for the first time as anode materials for Na-ion batteries. Powder X-ray diffraction (XRD) results show that the phase structures of Li 3− x Na x V 2 (PO 4 ) 3 /C evolve along with the change of Li/Na atomic ratio (0≤x≤3). With increasing x in Li 3− x Na x V 2 (PO 4 ) 3 /C from 0.0 to 3.0, the main phase in as-prepared sample transforms from monoclinic Li 3 V 2 (PO 4 ) 3 to rhombohedral Li 3 V 2 (PO 4 ) 3 , and finally to rhombohedral Na 3 V 2 (PO 4 ) 3 , which results in different sodium storage behavior and performance between Li 3− x Na x V 2 (PO 4 ) 3 /C (0≤ x ≤3) materials. Electrochemical results show that Li 3− x Na x V 2 (PO 4 ) 3 /C ( x =0.0, 0.5, 1.0, 1.5, 2.0, 2.5 and 3.0) can deliver the initial charge capacities of 21.1, 35.9, 33.8, 41.7, 43.3, 43.9 and 47.7 mAh g −1 at a current density of 10 mA g −1 , respectively. After 45 cycles, the reversible capacities can be kept at 16.9, 45.1, 32.6, 44.6, 43.7, 37.8 and 27.3 mAh g −1 for Li 3 V 2 (PO 4 ) 3 /C, Li 2.5 Na 0.5 V 2 (PO 4 ) 3 /C, Li 2 NaV 2 (PO 4 ) 3 /C, Li 1.5 Na 1.5 V 2 (PO 4 ) 3 /C, LiNa 2 V 2 (PO 4 ) 3 /C, Li 0.5 Na 2.5 V 2 (PO 4 ) 3 /C and Na 3 V 2 (PO 4 ) 3 /C, respectively. Furthermore, the structural reversibility of Li 3− x Na x V 2 (PO 4 ) 3 /C ( x =1.0, 2.0, and 3.0) is also observed by in-situ XRD observation during sodiation/de-sodiation process. All these observed evidences indicate that only some of Li 3− x Na x V 2 (PO 4 ) 3 /C (0≤ x ≤3) can be used as possible sodium storage materials.
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Inorganic Chemistry Frontiers
·
2024
·Vol. 11
·期 23
·8526-8534
·
IF 6.1
Fang Xu,Jialin Zheng,Dai-Huo Liu,Ao Wang,Zhenjiang Li,Chunyan Xu,Mengqin Song,Beinuo Zhang,Zhengyu Bai,Zhongwei Chen
Manganese dioxide is considered an ideal cathode candidate material for aqueous zinc-ion batteries. However, its poor conductivity and nanostructural degeneration impede its further application. Herein, a 3 × 3 tunnel-structured τ-MnO2 cathode material was synthesized through the addition of excessive Mg2+. During its preparation, a portion of Mg2+ was embedded into the 3 × 3 tunnel of τ-MnO2 to stabilize the microstructure, while another portion of Mg2+ formed a new phase, i.e., Mg2(OH)3Cl·4H2O, adjoining τ-MnO2, resulting in a cathode material with heterointerface synergy between τ-MnO2 and Mg2(OH)3Cl·4H2O. The charge arrangement of the heterointerface between τ-MnO2 and Mg2(OH)3Cl·4H2O enabled more active sites and accelerated ion-diffusion kinetics. The introduction of Mg2(OH)3Cl·4H2O increased the proportion of Mn(IV) and suppressed the structural instability caused by Jahn–Teller distortion, thereby improving the electrochemical performance of the τ-MnO2 cathode (capacity retention of 86.7% after 1800 cycles at 1 A g−1).
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JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2024
·
IF 2
Feihu Li,Yidong Gu,Yanli Sun,Dahaun Liu,Qunsheng Li
In the esterification reaction of n-propanol and acetic acid to produce n-propyl acetate, the presence of a mixture of n-propanol and n-propyl acetate is inevitable. However, the system of n-propanol and n-propyl acetate has an azeotropic point, which makes it impossible for conventional distillation to separate the two substances completely. Therefore, 1-ethyl-3-methylimidazolium acetate ([EMIM][OAC]) and 1-hexyl-3-methylimidazolium acetate ([HMIM][OAC]) were selected as entrainers to conduct the vapor–liquid equilibrium experiment of n-propanol + n-propyl acetate + [EMIM][OAC] and n-propanol + n-propyl acetate + [HMIM][OAC] at atmospheric pressure in this study. The experimental data were regressed by the NRTL model and UNIFAC-Lei model. NRTL model was in better agreement with the experimental data. The results showed that both [EMIM][OAC] and [HMIM][OAC] could separate the n-propanol + n-propyl acetate system, and [EMIM][OAC] showed the enormous separation potential of ionic liquids based on [OAC]− as anions for the azeotropic system.
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高影响因子
DALTON TRANSACTIONS
·
2025
·Vol. 54
·期 30
·11581-11587
·
IF 3.3
Haoran Yu,Liang Cao,Jiajia Wang,Jian Guo,Ji Zhang,Shan-Tao Zhang
Pb(Ni1/3Nb2/3)O3-PbZrO3-PbTiO3 (PNN-PZ-PT) is one of the typical relaxor-PT piezoelectric systems. In order to further improve its Curie temperature (Tc) and piezoelectric properties, nominal Pb(Mg1/3Nb2/3)O3 (PMN) is introduced into 2mol% Sm-doped 0.36PNN-0.28PZ-0.36PT to form a (0.36 − x)PNN-xPMN-0.28PZ-0.36PT:0.02Sm (x = 0–0.24) quaternary solid solution. The phase, microstructure, domain structure, and electrical properties of the solid solution ceramics were investigated systematically. All the samples exhibit a single phase perovskite structure and are situated around the rhombohedral-tetragonal morphotropic phase boundary. With increasing x, the Tc increases gradually, while the piezoelectric coefficient d33 increases initially and decreases subsequently, reaching a peak value of 725 pC N−1 at around x = 0.15. In particular, this optimal composition illustrates high performance with Tc = 176 °C, planar electromechanical coupling factor kp = 0.63, remanent polarization Pr = 30 μC cm−2, and coercive field Ec = 8.9 kV cm−1. This study illustrates the viability of incorporating PMN into PNN-PZ-PT to optimize the comprehensive electrical properties, potentially offering a valuable guide for developing high performance relaxor-PT materials.
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高影响因子
ACS Catalysis
·
2016
·
IF 9.307
Zhixin Zhang,Yehong Wang,Jianmin Lu,Chaofeng Zhang,Min Wang,Mingrun Li,Xuebin Liu,Feng Wang
Conversion of low-carbon olefins to higher alcohols or olefins via the formation of C–C bonds is an increasingly important topic. We herein report an example of converting isobutene and formaldehyde (38 wt % aqueous solution) to 3-methyl-1,3-butanediol (MBD), a precursor for isoprene. The reaction occurs through a Prins condensation–hydrolysis reaction over a praseodymium (Pr)-doped CeO2 catalyst. The best MBD yield (70%) is achieved over the Pr-doped CeO2 catalyst. Catalyst characterizations with high-angle annular dark field transmission electron microscopy (HAADF-TEM), pyridine adsorption infrared (IR) and Raman spectroscopy, and density functional theory (DFT) calculations show that the doped Pr is uniformly and highly dispersed in the CeO2 crystalline phase. In addition, the Pr doping creates more oxygen vacancy sites on CeO2 and thus enhances the Lewis acidity of the catalyst, which is responsible for the catalytic performance of the Pr-CeO2 catalyst.
研究领域:
催化化学
·
材料科学
·
有机合成
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Analytical Methods
·
2015
·Vol. 7
·期 10
·4055-4058
·
IF 1.821
Yongming Guo,Qinge Ma,Fengpu Cao,Qiang Zhao,Xuewei Ji
We have developed a simple method for the colorimetric detection of hypochlorite in tap water based on the oxidation of 3,3′,5,5′-tetramethylbenzidine (TMB). In aqueous solution at pH 4.0, hypochlorite, an oxidant, rapidly converts colourless TMB to a blue oxidized form. The presence of hypochlorite in tap water can in this way easily be detected with the naked eye, based on the obvious colour change. The system can detect concentrations of hypochlorite as low as 0.05 μM with an excellent linear relationship and good selectivity.
研究领域:
分析化学
·
环境监测
·
生物传感
·
水处理
·
分子诊断
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高影响因子
JOURNAL OF ORGANIC CHEMISTRY
·
2018
·
IF 4.805
Zhen-Hua Li,Zhi-Jiang Jiang,Qiao-Ling Shao,Jin-Jing Qin,Qiang-Feng Shu,Wen-Hao Lu,Wei-Ke Su
A one-pot cascade heterocyclization strategy has been developed for the synthesis of 2,4-dichloro-substituted pyrano[2,3-d]pyrimidines and furo[2,3-d]pyrimidines from linear γ- and β-ketomalononitriles using triphosgene and triphenylphosphine oxide. The reaction afforded synthetic useful products with moderate to good yields, bypassing the conventional harsh conditions of chlorination. The mechanistic study revealed that the reaction proceeded with a non-isocyanate route, and the second step may conduct in a triphenylphosphine oxide-catalyzed manner.
研究领域:
有机化学
·
药物化学
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高影响因子
MICROCHIMICA ACTA
·
2019
·Vol. 186
·期 12
·1-8
·
IF 5.479
Zhuo Shujuan,Fang Jing,Li Meng,Wang Jing,Zhu Changqing,Du Jinyan
A colorimetric assay is presented for the determination of ascorbic acid (AA). Manganese(II) doped carbon dots (Mn-CDs) were prepared by a convenient hydrothermal route and are shown to possess oxidase-like catalytic ability. They catalyze the oxidation of 3,3′,5,5′-tetramethylbenzidine (TMB) by dissolved oxygen to form a blue colored product (oxTMB). AA can reduce blue oxTMB to colorless TMB. The fading of the blue color (measured at 652 nm) can be applied for quantifying AA in the 50 to 2500 nM concentration range and with a 9 nM detection limit. The method was successfully used for the quantitation of AA in real samples.
Schematic representation of a colorimetric assay platform for the sensitive detection of ascorbic acid (AA) in view of inhibitory effect of AA on the 3,3′,5,5′-tetramethylbenzidine (TMB) oxidation, benefitting from excellent oxidase-like catalytic activity of manganese(II) doped carbon dots (Mn-CDs).
研究领域:
分析化学
·
生物医学
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高影响因子
INTERNATIONAL JOURNAL OF FOOD MICROBIOLOGY
·
2026
·
IF 5.7
Gaolei Bai,Jing Gao,Shizi Zhang,Liumi Meng,Ren Chu,Jichang Zhang,Lijuan Luo,Lingyan Jiang
The search for natural and safe alternatives to synthetic fungicides is crucial for controlling postharvest anthracnose in papaya, a disease primarily caused by Colletotrichum species. This study identifies Bacillus cereus ZW21 as a potent biocontrol agent and delineates the mechanism of its volatile organic compounds (VOCs) directly in a fruit system. In vivo assays on papaya fruit demonstrated that ZW21 VOCs significantly reduced lesion area and disease incidence by up to 80.95% and 70.46%, respectively. Bioactivity-guided identification revealed hydroxyacetone (HA) and 3-methyl-3-buten-1-ol (ME) as the key antifungal VOCs. These compounds exhibited direct antifungal activity by disrupting fungal membrane integrity, inducing mitochondrial dysfunction, and elevating reactive oxygen species. Beyond direct inhibition, transcriptomic analysis of treated fruit revealed that HA and ME activated host defense pathways, including phenylpropanoid biosynthesis and hormone signaling, while suppressing ripening-related metabolism. A critical distinction was observed: ME enhanced glycolysis and pyruvate metabolism, providing a mechanistic explanation for potential phenolic overflow and fruit blackening, whereas HA avoided this metabolic overdrive. Our findings not only validate the efficacy of a novel biocontrol strain and its defined VOCs but also provide a comprehensive mechanistic framework supporting their application for sustainable postharvest protection.
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高影响因子
Journal of Animal Science and Biotechnology
·
2026
·Vol. 17
·期 1
·169
·
IF 7.9
Li Jiahao,Wang Zhengli,Ma Xiaoxue,Nie Cunxi,Liu Tingting,Li Yuanyuan,Zhang Wenju
Background Diarrhea in suckling lambs is associated with gut microbiota dysbiosis, impaired intestinal barrier function, and enhanced inflammatory responses. However, the specific intestinal microbes and microbial metabolites linked to intestinal homeostasis in suckling lambs remain unclear. Results In this study, diarrheic lambs showed significantly higher serum diamine oxidase (DAO) activity, D-lactate (D-LA), and pro-inflammatory cytokine levels than healthy lambs. We then compared gut microbial composition and metabolite profiles between healthy and diarrheic suckling lambs. Diarrheal lambs exhibited gut microbiota dysbiosis, characterized by an elevated Bacillota (syn. Firmicutes)/Bacteroidota (syn. Bacteroidetes) ratio, reduced abundance of beneficial commensals including Phocaeicola vulgatus and Bacteroides fragilis , and proliferation of the opportunistic pathogen Clostridium perfringens . Metabolomic analysis showed that, in diarrheic lambs, the tryptophan metabolism pathway was reduced with lower levels of indole-3-carboxaldehyde (IAld) and 5-hydroxyindole-3-acetic acid (5-HIAA) than in healthy lambs. Fecal microbiota transplantation experiments showed that transplantation of microbiota from diarrheic lambs partially recapitulated the donor-associated microbial, metabolic, and inflammatory phenotypes in recipient mice. Finally, functional validation using a dextran sulfate sodium (DSS)-induced colitis model revealed that supplementation with IAld and 5-HIAA significantly alleviated DSS-induced intestinal inflammation and barrier damage, accompanied by downregulated expression of genes related to the Tlr4-Myd88-Nfκb signaling pathway. Conclusions Our findings indicate that the gut microbiota-derived tryptophan metabolites IAld and 5-HIAA alleviated inflammation and improved intestinal epithelial barrier function by enhancing tight junction integrity, while also reducing the expression of Tlr4/Myd88/Nfκb pathway-related inflammatory signaling molecules.
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