JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Runfang Yang,Kai Zhang,Wei Yan,Chunyang Li,Yiwen Long,Maosheng Wu,Xiaolin Cheng,Hongwei Han,Xingguang Zhang,Mingxing Zhang,Guozhong Wu
Ni 3 (NO 3 ) 2 (OH) 4 positive electrode material was for the first time synthesized by gamma ray radiation under ambient conditions, and systematically investigated the synthesis mechanisms and electrochemical performance. The electrochemical performance of Ni 3 (NO 3 ) 2 (OH) 4 electrode can be regulated by controlling the absorbed dose. Ni 3 (NO 3 ) 2 (OH) 4 -200 kGy displays a remarkable electrochemical performance for supercapacitor, including a high specific capacity (1,086.7 C g –1 at 1 A g –1 ), good rate capability (50.6% at 15 A g –1 ), fast Faraday reaction kinetics, and excellent electrochemical cycle stability (90.8% retention at 5 A g –1 , after 5,000 cycles). Furthermore, the assembled Ni 3 (NO 3 ) 2 (OH) 4 -200 kGy//AC hybrid device exhibits a notable energy density of 99.8 Wh kg –1 at a power density of 849 W kg –1 (1 A g –1 ), and excellent electrochemical cycle stability, retaining ~92.5% of its initial capacitance after 5,000 cycles at 1 A g –1 . This work provides a new reaction pathway for the synthesis of inorganic materials and expands the potential application of radiation technology for electrode materials.
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JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
·
2015
·Vol. 124
·期 1
·471-478
·
IF 2.042
Lu Gui-bin,Yang Ting,Chen Li-ping,Zhou Yi-shan,Chen Wang-hua
2-Ethylhexyl nitrate (EHN) is an important nitro compound for chemical industry. However, EHN is an unstable material and frequently causes fire and explosion accidents. Therefore, it is necessary to understand the mechanism of its thermal decomposition. In this paper, EHN was investigated by differential scanning calorimeter under non-isothermal and isothermal conditions, and its thermal decomposition kinetics was calculated with Friedman method. A model for the decomposition reaction was established by Malek method and verified by an isothermal method. The results indicated that the values of activation energy ( E ) for EHN were (154 ± 3) kJ mol −1 under non-isothermal and (157 ± 7) kJ mol −1 under isothermal conditions. In addition, there was almost no difference in E at various extent of the reactant conversion, suggesting that a single-step reaction model is suitable to describe the decomposition reaction. In addition, the temperature of no return ( T
NR ) and self-accelerating decomposition temperature were calculated under non-isothermal and isothermal conditions. Using Malek method, the decomposition model obtained is Avrami–Erofeev equation ( n = 4/3). This model was verified by G ( α ), based on the results of isothermal experiment. The kinetic parameters under the isothermal conditions were in good agreement with those obtained under the non-isothermal conditions.
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CHEMISTRY-A EUROPEAN JOURNAL
·
2012
·Vol. 19
·期 2
·501-508
·
IF 5.925
Jianwei Nai,Zhengbo Chen,Haopeng Li,Fangyuan Li,Yang Bai,Lidong Li,Lin Guo
As the properties of nanomaterials are strongly dependent on their size, shape and nanostructures, probing the relations between macro-properties and nanostructures is challenging for nanoscientists. Herein, we deliberately chose three types of Ni(OH) 2 with hexagonal, truncated trigonal, and trigonal hourglass-like nanostructures, respectively, as the electrode modifier to demonstrate the correlation between the nanostructures and their electrocatalytic performance towards L -histidine. It was found that the hexagonal hourglass-like Ni(OH) 2 sample had the best electrocatalytic activity, which can be understood by a cooperative mechanism: on one hand, the hexagonal sample possesses the largest specific surface area and the tidiest nanostructure, resulting in the most orderly packing on the electrode surface; on the other hand, its internal structure with the most stacking faults would generate a lot of unstable protons, leading to an enhanced electronic conductivity. The findings are important because they provide a clue for materials design and engineering to meet a specific requirement for electrocatalysis of L -histidine, possibly even for other biomolecules. In addition, the hexagonal Ni(OH) 2 -based biosensor shows excellent sensitivity and selectivity in the determination of L -histidine and offers a promising feature for the analytical application in real biological samples. Graphical Structure-dependent performance : Three different types of Ni(OH) 2 with hexagonal, truncated trigonal, and trigonal hourglass-like nanostructures, respectively, were deliberately chosen as electrode modifiers to demonstrate the correlation between the structures and their electrocatalytic performance toward L -histidine (see figure). The electrocatalytic activity of these unique nanostructures depends not only their external architecture, but also on their relevant internal degree of crystallinity.
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Inorganic Chemistry Frontiers
·
2026
·
IF 6.2
Chenyang Zhan,Zihao Wang,Sisi Liang,Zhi-Ying Zhao,Hanru Chen,Jiahe Yu,Haomiao Zhu
Alkaline earth lithoaluminates with the UCr4C4-type structure have demonstrated considerable potential in achieving narrow-band emissions from Eu 2+ . However, obtaining single-phase powder samples with green-emitting remains challenging. In this study, we address this issue by co-doping Ba 2+ into the novel UCr4C4-type system Sr5/6-xBaxLi17/6Al7/6O4:Eu 2+ , which significantly enhances phase purity and structural homogeneity. This approach not only reduces the emission bandwidth from 66 nm (2241 cm -1 ) to 51 nm (1830 cm -1 ) but also induces a blue shift to 529 nm, fine-tuning the emission into the desired deep green region. Through detailed mechanistic studies-including low-temperature spectroscopy and luminescence decay analysis-we identify the presence of multiple Eu 2+ emission centers associated with distinct Sr 2+ sites. Ba 2+ doping is shown to promote dominant Eu 2+ emission in the green spectral region, thereby facilitating spectral narrowing.The optimized phosphor achieves a high absorption efficiency of 64.6% and an external quantum yield of 22.2%. When integrated into a white LED prototype, it enables a color gamut covering 97.6% of the NTSC (National Television System Committee) standard, outperforming a commercial β-SiAlON:Eu 2+ -based device. This study provides an effective cationic codoping strategy for designing high-performance narrow-band oxide phosphors and highlights a promising candidate for nextgeneration display technologies.
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Catalysis Science & Technology
·
2019
·Vol. 9
·期 18
·5130-5141
·
IF 5.726
Shuang Song,Qiuxiang Liu,Jinhui Fang,Weiting Yu
The reductive dechlorination of chlorinated organic compounds (COCs) is very important to reduce the toxicity of waste effluents produced from pharmaceutical, electronics, dyestuff, pesticide, paper, and plastics industries. Electrochemical dechlorination as a green technology under mild reaction conditions is widely used in the reductive dechlorination of COCs using Pd as the electrode. Currently, the challenges of this method are the need to use large Pd loadings and the low dechlorination efficiency. Efforts were made in this work to reduce the loading of Pd and improve the efficiency using 2,4-dichlorophenoxyacetic acid (2,4-D) as a probe molecule for COCs in dechlorination. In this study, Pd-anchored Ni(OH)2/Ni-foam bifunctional electrodes were prepared in situ and for the first time applied in the reductive dechlorination of COCs. The results indicate that the dechlorination efficiency of 2,4-D can be enhanced on Pd-anchored Ni(OH)2/Ni-foam bifunctional electrodes even at a low Pd loading (<2 mg cm−2). A synergistic effect is found for 2,4-D dechlorination: H* formation on Ni(OH)2 and dechlorination steps on Pd. The enhanced dechlorination efficiency might be related to the shortened transport route between Ni(OH)2 and Pd active centers for H*.
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ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
·
2024
·
IF 6.2
Bo Xu,Zhen Zhang,Hong Yang,Liyang Ding,Wenjie Dai,Ling Liu,Xing Du,Xufeng Fu,Xiuying Pei
Di-hexyl phthalate (2-ethylhexyl) (DEHP) has been confirmed to cause female reproductive toxicity in humans and model animals by affecting the survival of ovarian granulosa cells (GCs), but the interrelationships between DEHP's on autophagy, apoptosis, and inflammation in GCs are not clear. Our previous study demonstrated that DEHP exposure resulted in the disturbance of intestinal flora associated with serum LPS release, which in turn led to impaired ovarian function. LPS has also been shown to determine cell fate by modulating cellular autophagy, apoptosis, and inflammation. Therefore, this study investigated the role and link between LPS and autophagy, apoptosis, and inflammation of GCs in DEHP-induced ovarian injury. Here, we constructed an in vivo injury model by continuous gavage of 0–1500 mg/kg of DEHP in female mice for 30 days and an in vitro injury model by treatment of human ovarian granulosa cells (KGN) cells with mono-2- ethylhexyl ester (MEHP, an active metabolite of DEHP in vivo ). In addition, the expression of relevant pathway molecules was detected by immunohistochemistry, immunofluorescence, qRT-PCR, and Western blotting after the addition of the autophagy inhibitor 3-methyladenine (3-MA), the apoptosis inhibitor Z-VAD- FMK and the NF-κB inhibitor BAY11-7082. The current study found that autophagy and apoptosis were significantly activated in GCs of DEHP-induced atretic follicles in vivo and found that MEHP-induced KGN cells autophagy and apoptosis were independent and potentially cytotoxic of each other in vitro . Further studies confirmed that DEHP exposure resulted in LPS release from the intestinal tract and entering the ovary, thereby participating in DEHP-induced inflammation of GCs. In addition, we found that exogenous LPS synergized with MEHP could activate the NF-κB signaling pathway to induce inflammation and apoptosis of GCs in a relatively prolonged exposure condition. Meanwhile, inhibition of inflammatory activation could rescue apoptosis and estrogen secretion function of GCs induced by MEHP combined with LPS. These results indicated that the increased LPS influenced by DEHP might cooperate with MEHP to induce inflammatory apoptosis of GCs, an important cause of ovarian injury in mice.
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PubMed
高影响因子
JOURNAL OF ORGANIC CHEMISTRY
·
2024
·
IF 3.3
Yang Zhu,Guisheng Deng
The Cu(MeCN)4PF6-catalyzed reaction of 1-(2-hydroxyphenyl)-propargyl alcohols with aryl/alkyl mercaptan and subsequent treatment with K2CO3 only offered 3-(alkylthio)benzofurans, whereas the stoichiometric-exceeding CuI-mediated reaction and subsequent treatment with DIPEA furnished 2-(alkylthiomethyl)benzofurans with high selectivity. The amount of Cu(I) salts plays a key role in selective formation. This unique protocol for the selective construction of the two series of benzofurans containing alkylthio group proved to be suitable for broad substrates 1 and 2 except for aliphatic alkynyl alcohols.
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JOURNAL OF MEMBRANE SCIENCE
·
2018
·
IF 6.578
Xiaoxiao Zhang,Qingting Liu,Lei Xia,Dongyang Huang,Xudong Fu,Rong Zhang,Shengfei Hu,Feng Zhao,Xiao Li,Xujin Bao
To broaden the operating temperature range of phosphoric acid (PA) doped polybenzimidazole membrane-based proton exchange membrane fuel cells (PEMFCs) toward low temperatures, a novel series of poly(2,5-benzimidazole) (ABPBI)/sulfonated sepiolite (S-Sep) composite membranes (ABPBI/S-Sep) with low PA doping levels (DLs) were prepared via in-situ synthesis. The desirably enhanced mechanical, thermal, and oxidative stabilities of ABPBI/S-Sep composite membranes were achieved by constructing ABPBI chains arranged along the sepiolite (Sep) fibers and acid-base crosslinks formed between S-Sep fibrous particles and ABPBI chains. Benefiting from the richness of high temperature stable bound water and the excellent water absorbability of Sep particles that enable the formation of additive proton conducting paths, the composite membranes retained bounded PA and achieved much higher proton conductivities under both anhydrous and hydrous conditions compared to PA-doped ABPBI membranes. Proton conductivity values above 0.01 S/cm at 40–90 °C/20–98% RH conditions and 90–180 °C/anhydrous conditions as well as peak power density of 0.13 and 0.23 W/cm 2 at 80 and 180 °C with 0% RH, respectively from the ABPBI/2S-Sep composite membrane are more holistic compared to Nafion at low temperatures and polybenzimidazole-based membranes at high temperatures, respectively. The excellent properties of ABPBI/S-Sep composite membranes suggest them as prospective candidates for PEMFCs applications in a wide temperature range.
研究领域:
材料科学
·
能源科学
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Bioengineered
·
2022
·
IF 6.832
Wenbo Zhang,Pu Xu,Yanan Cheng,Yanlan Yang,Qiuhua Mao,Zuogeng Chen
A nanopearl powder/C-HA (chitosan-hyaluronic acid)/rhBMP-2 (recombinant human bone morphogenetic protein-2) composite artificial bone material was prepared, and its biological properties were evaluated. The nanopearl powder/C-HA/rhBMP-2 composite porous artificial bone material was prepared using the freeze-drying method after the nanopearl powder was prepared using mechanical ball milling. The particle was measured with a transmission electron microscope, its surface morphology and pore size were observed under a scanning electron microscope. The porosity of the artificial bone was determined using pycnometry, a compression performance test was conducted with a universal testing machine, and XRD (X-ray diffraction) patterns were recorded to examine the crystal form of the pearl powder in the composite artificial bone. Finally, the artificial bone was cocultured with mouse MC3T3-E1 cells to investigate its effects on cell proliferation and differentiation and the expression of osteogenesis-related genes. The pearl powder prepared in this experiment had a particle size in the nanometer range. This nanopearl powder, along with C-HA and rhBMP-2, was compounded into the nanopearl powder/C-HA/rhBMP-2 composite artificial bone, showing pore sizes of 188.53 ± 15.32 μm, a porosity of 86.43 ± 2.78% and a compressive strength of 0.342 ± 0.024 MPa. Notably, rhBMP-2 was released from the artificial bone in a sustained manner. Moreover, this artificial bone promoted the adhesion, proliferation, and differentiation of MC3T3-E1 cells and upregulated the expression of ColαI (collagen α1), OCN (osteocalcin), OPN (osteopontin) and Runx2 (runt-related gene 2). Conclusively, this nanopearl powder/C-HA/rhBMP-2 composite artificial bone material showed good performance and cytocompatibility, suggesting that it can be used for bone tissue engineering.
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JOURNAL OF STRUCTURAL CHEMISTRY
·
2026
·Vol. 67
·期 2
·404-414
·
IF 1.5
You Z. L.,Song N. S.,Qiao Z. Y.,Feng X. H.
Aroylhydrazones with various substituent groups and their metal complexes have interesting biological activities. In this work, two new copper(II) complexes [Cu 2 (L a ) 2 ]2NO 3 ∙2MeOH ( 1 ) and [CuL b (CH 3 OH) 2 ]NO 3 ∙CH 3 OH ( 2 ), derived from the aroylhydrazones 4-hydroxy- N’ -(2-hydroxy-5-methylbenzylidene)-3-methoxybenzohydrazide (HL a ) and 4-hydroxy- N’ -(2-hydroxy-3-methoxybenzylidene) benzohydrazide (HL b ), were synthesized and characterized by physico-chemical methods such as elemental analysis and infrared spectroscopy. Structures of the complexes were confirmed by single crystal X-ray determination. The hydrazone ligands in the complexes coordinate to Cu ions through phenolate oxygen, imino nitrogen and carbonyl oxygen atoms. The Cu ions in complex 1 are in square planar coordination, and that in complex 2 is in square pyramidal coordination. Both complexes show good antibacterial activities on the bacterial strains Bacillus subtilis , Staphylococcus aureus and Escherichia coli , while weak activity on the fungal strain Candida albicans and no activity on Aspergillus niger .
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JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2022
·Vol. 331
·期 4
·1731-1740
·
IF 1.754
Kubota Masahiko,Wu Hao,Kim Seong-Yun
A N’-N’ -di-n-hexyl-thiodiglycolamide and 2,2’-[(2-ethylhexyl)imino]bis[ N,N -bis(2-ethylhexyl)acetamide] impregnated porous silica-based adsorbent was prepared for enhancing the adsorption of palladium ions from simulated high-level liquid waste. The adsorbent exhibited a relatively fast palladium response and selectivity without the use of additional modification reagents. Palladium ions were adsorbed over a wide nitric acid range of 0.6−5 M and a broad temperature range of 288−323 K. The uniform distribution of adsorbed palldium ions onto the study adsorbent was confirmed by PIXE. Successful recovery of more than 90% of the palladium ions was achieved using 0.1 M thiourea via separation by column experiments. Based on the obtained data, it is expected that the prepared adsorbent can be used for the practical separation of palladium ions from high-level liquid waste.
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Bioengineered
·
2022
·
IF 6.832
Miao Zhang,Chengkun Yin,Yan Chen,Juan Wang,Jing Jiang
Triggering receptor expressed on myeloid cells 1 (TREM1) participates in the development of endometritis. This study aims at identifying the effects and interaction of TREM1 and upstream stimulatory factor 2 (USF2) in endometritis by using a model of lipopolysaccharide (LPS)-induced human endometrial epithelial cells (HEnEpCs). ELISA was performed to determine the levels of interleukin (IL)-6, IL-1β, and tumor necrosis factor (TNF-α) after LPS stimulation. TREM1 and USF2 expression was examined with RT-qPCR and Western blot. The JASPAR database was employed to predict the binding site between USF2 and TREM1, which was confirmed by luciferase reporter and chromatin immunoprecipitation assays. After TREM1 overexpression, IL-6, IL-1β, and TNF-α expression was detected by ELISA. Next, the binding of TREM1 to toll-like receptor (TLR) 2/4 was examined with co-immunoprecipitation. Then, proteins in TLR2/4-nuclear factor-kappaB (NF-κB) signaling in HEnEpCs under LPS condition were assessed by Western blot or immunofluorescence before and after TREM1 knockdown. Finally, TLR2 or TLR4 was silenced to explore whether intervene TLR2/4-NF-κB signaling pathway could rescue TREM1-overexpression-induced inflammation in LPS-induced HEnEpCs. Results revealed that upregulated TREM1 was observed in LPS-challenged HEnEpCs. Next, USF2 was found to have transcriptionally active TREM1 expression. Additionally, USF2 knockdown decreased the levels of IL-6, IL-1β, and TNF-α, whereas this effect was rescued after TREM1 overexpression. Besides, TREM1 could bind to TLR2/4 to regulate NF-κB signaling. Moreover, the intervention of TLR2/4-NF-κB signaling pathway rescued TREM1-overexpression-induced inflammation in LPS-stimulated HEnEpCs. Collectively, USF2 promotes endometritis by upregulating TREM1, thereby activating TLR2/4-NF-κB pathway.
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