Journal of the Iranian Chemical Society
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2025
·
IF 2.3
Tan Yan,Hu Jing,Tang Dongjin,Yu Peng
Thiocyanate (SCN − ) is an anionic contaminant and is a biomarker of environmental cyanide exposure. Therefore, it is particularly necessary to develop a simple, fast and sensitive method for SCN − assay. Herein, a fluorescent assay method was developed to determine SCN − based on Cu 2+ -triggered oxidation of o-phenylenediamine (OPD). Without SCN − , OPD was oxidized by Cu 2+ and the resultant product (i.e., OPD oxide) exhibited a high fluorescence. However, in the presence of SCN − , Cu 2+ reacted with SCN − ; and thus, the oxidation ability of Cu 2+ toward OPD was reduced, resulting in a weak fluorescence. Several important parameters such as the concentrations of Cu 2+ and OPD, pH and the reaction time were optimized. Under the optimized conditions, the linear range was 5–80 μM and the limit of detection was 5 μM for SCN − assay. In addition, the high selectivity and the satisfactory recoveries in tap water and artificial saliva were achieved for SCN − detection due to the strong chelation between SCN − and Cu 2+ . The whole detection process was simple and fast without using complex nanoparticles. More importantly, the developed assay method will have promising applications in monitoring of SCN − for the assessment of water safety and human health. Graphical abstract
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Journal of Energy Chemistry
·
2025
·
IF 14.9
Tao Zhao,Yunzhen Jia,Qiang Fang,Runxin Du,Genyan Hao,Wenqing Sun,Guang Liu,Dazhong Zhong,Jinping Li,Qiang Zhao
Ruthenium dioxide (RuO 2 ) is one of the most promising acidic oxygen evolution reaction (OER) catalysts to replace the expensive and prevalent iridium (Ir)-based materials. However, the lattice oxygen oxidation induced Ru dissolution during OER compromises the activity and stability. Amorphous materials have been identified as a viable strategy to promote the stability of RuO 2 in acidic OER applications. This study reported a nanoporous amorphous-rich RuMnO x (A-RuMnO x ) aerogel for efficient and stable acidic OER. Compared with highly crystalline RuMnO x , the weakened Ru–O covalency of A-RuMnO x by forming amorphous structure is favorable to inhibiting the oxidation of lattice oxygen. Meanwhile, this also optimizes the electronic structure of Ru sites from overoxidation and reduces the reaction energy barrier of the rate-determining step. As a result, A-RuMnO x aerogel exhibits an ultra-low overpotential of 145 mV at 10 mA cm −2 and durability exceeding 100 h, as well as high mass activity up to 153 mA mg −1 Ru at 1.5 V vs. reversible hydrogen electrode (RHE). This work provides valuable guidance for preparing highly active and stable Ru-based catalysts for acidic OER.
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IEEE SENSORS JOURNAL
·
2024
·Vol. 24
·期 22
·36239-36246
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IF 4.3
Dong Zhao,Honglie Chen,Kun Yang,Haoyu Wang,Xing Guo,Yang Ge,Xiushan Dong,Shengbo Sang
The application of competitive immunoassay brings many advantages to the detection of trace biomolecules and has the potential to be applied to urine-based clinical practice. However, this type of detection method has strict requirements for secondary antibody incubation processes and analysis equipment, leading to strong demands for convenient, rapid, and inexpensive detection platforms. In this study, a mechanical competitive immunosensor (MCI) was proposed for the detection of human serum albumin (HSA) based on goat anti-rabbit @Fe2O3 magnetic beads with magnetic sensitization. With the doping of Fe2O3, the conversion layer of MCI responds more accurately and rapidly to stress. In addition, goat anti-rabbit conjugated with animated Fe2O3 nanoparticles were introduced as secondary antibodies for signal amplification. Under the synergistic effect of the magnetic force of magnetic beads and the stress caused by the specific binding of antigen and antibody, the deformation of the film was amplified, which can effectively change the conductive pathway formed by doped carbon nanotubes, resulting in a larger output electric signal. Through competitive immunoassay for HSA, a limit of detection (LOD) of 68 ng/mL was achieved, which was an order of magnitude lower than direct detection methods. With high reproducibility and stability, MCI demonstrated effectiveness in the detection of HSA at a clinically significant concentration range (0.1–
$50 \; \mu $
g/mL). Moreover, MCI showed excellent specificity and selectivity, which held promise to offer an alternative tool for clinical diagnosis of urine HSA levels in nephrotic patients.
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JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
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2024
·Vol. 149
·期 10
·4491-4503
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IF 3
Chen Yongjia,Zhao Yilin,Hua Min,Pan Xuhai,Jiang Huichun,Jiang Juncheng
We investigated the inhibition of thermal runaway of styrene polymerization by DNPB. DNBP is an inhibitor in styrene polymerization reaction. Polymerization is one of eighteen hazardous processes. Styrene polymerization reaction is characterized by high heat production and fast reaction rate. Firstly, differential scanning calorimetry (DSC) and adiabatic calorimetry (ARC) were chosen to study the effect of different mass of DNBP on thermal behavior in non-isothermal and adiabatic environments. Secondly, exploring the inhibitory effect of DNBP at different runaway temperatures using an oil bath reactor. The results showed that when DNBP was at 0.80%, effective inhibition was obtained at different runaway temperatures. Finally, GC/MS and Gauss16 were used to infer the mechanism of inhibition in terms of macroscopic products and microscopic instabilities. The results showed that the products of the oil bath reactor experiments were related to the mass of DNBP, and when DNBP was 0.80%, the products increased and the main reaction was inhibited. Finally, it was deduced that the nitro group undergoes a possible path of direct addition reaction with the styrene radical before bond breaking.
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Journal of Environmental Sciences
·
2024
·
IF 5.9
Wei Hou,Qian Zheng,Hengyue Xu,Guangming Zhan,Long Zhao,Jie Dai,Jiaxian Wang,Xingyue Zou,Bing Zhou,Lufa Hu,Ruizhao Wang,Kaiyuan Wang,Yancai Yao,Lizhi Zhang
Atomic hydrogen (H*) plays a crucial role in electrochemical reduction technology towards various environmental and energy applications, but suffers from low utilization efficiency arisen from the undesirable H–H dimerization and the competitive adsorption between water molecule with reactants on the traditional adjacent catalytic sites. Herein, we anchored Pd single atoms on the naturally formed titanium oxide of titanium foam to construct Pd 1 -O-Ti dual-site electrocatalyst with spatially isolated water dissociation and H* utilization site, which synchronously inhibits the H–H dimerization and the competitive adsorption of water molecule and targeted reactants. Experiments and theoretical calculations revealed that the Ti–O sites could synergistically dissociate water to H*, which overflowed to nearby Pd single-atom sites for designed reduction reactions and utilization benefiting from the hydrogen spillover ability of titanium oxide substrate. These Pd 1 -O-Ti dual sites delivered almost 100 % bromate reduction efficiency with a rate constant of 1.57 h –1 , far superior to those of Pd n -O-Ti with adjacent Pd sites (0.52 h –1 ), Pd 1 -N-C with single sites (0.04 h –1 ) and commercial Pd/C (0.18 h –1 ), respectively. This study sheds light on the importance of integrating synergistic active sites for complicated electrochemical reactions, and provide new insights in improving H* utilization for environmental remediation.
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THERMOCHIMICA ACTA
·
2025
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IF 3.5
Yuxin Yang,Chunhua Lou,Huixiao Wang,Jingjing Yu
In this study, dicyandiamide (DCD) was modified with o-aminoacetophenone to synthesize a new curing agent for epoxy resin (EP), called o-acetylphenylguanidine (o-APG). The experimental results showed that the yield of o-APG could reach 85.79% under the optimal ratio. The structure of o-APG was characterized via Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, X-ray diffraction analysis, and nuclear magnetic resonance spectroscopy. The result deduced that the compatibility of o-APG with EP was significantly improved because reacted to form the group. The curing kinetics of the reaction of EP cured with o-APG was investigated via differential scanning calorimetry (DSC) by using the methods of Kissinger, Ozawa, Starink, and Friedman. The DSC analysis result showed that curing temperature was reduced by about 50 °C compared with the DCD-cured EP.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2024
·
IF 5.8
Fangfang Chen,Jiaming Wang,Wei Xu,Zhuangzhuang Ren,Guan Peng,Tao Huang,Fei Zhao
In this work, europium (III) complexes were synthesized by using different o-hydroxy-benzophenone ligands, namely 2-hydroxy-4-octyloxybenzophenone (HL 1 ), 4-allyloxy-2-hydroxybenzophenone (HL 2 ) and 2-hydroxy-4-methoxybenzophenone (HL 3 ). The structures and optical properties of the Eu III complexes E1, E2 and E3 were characterized by elemental analysis, infrared/fluorescence spectroscopy and mass spectrometry. The aggregation-induced emission properties from E1, E2 and E3 were systematically investigated in the acetone/water binary mixtures. At the same time, the corresponding agglomeration behavior and self-assembly structures in the Eu III complex system was confirmed through scanning electron microscopy. Excellent luminescent performance was illustrated in sample of E1 (the luminescence quantum yield of 21.36 % in solid state) which should be attributed to the aggregation-induced emission from better self-assembly behavior with longer carbon chain in ligand. The results of ultraviolet aging resistance from E1 reveal that the self-assembly behavior could not only improve the aggregation-induced emission performance, but also enhance the photostability of Eu III complex compared with the traditional β-diketone Eu III complex. This discovery may provide a facile strategy to design and prepare more promising rare earth complexes with good luminescence properties and strong photostability for application in solid state.
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APL Materials
·
2024
·Vol. 12
·期 4
·
IF 5.3
Lin Jia,Wang Shuai,Jin Hua,Cui Shuyuan,Wang Rongwen,Yang Yihang,Huang Guimei,Wang Jinhuo
The preparation of ceramic materials with complex porous structures through photopolymerization-based 3D printing requires the development of stable and printable slurries. In this study, zirconium acetylacetonate was incorporated into the thiol vinyl organosilicon prepolymer to create a photosensitive Si–Zr–O–C slurry. Regarding the natural bone structures and the Tyson polygon principle, a gradient pore structure was designed and then printed using a digital light processing 3D printer. After printing, the effects of sintering temperatures on the phase composition and structure of Si–Zr–O–C ceramics were systematically investigated. Subsequently, a comparative analysis of structure and properties was performed on sintered samples with different zirconium acetylacetonate contents. The results revealed that the sample containing 30 wt. % zirconium acetylacetonate exhibited a higher compressive strength of 9.70 ± 0.28 MPa and a lower room temperature thermal conductivity of 0.528 W m −1 K −1 . This study confirmed the significant potential of using 3D printing technology to prepare Si–Zr–O–C precursor ceramics with a porous structure.
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Nature Communications
·
2025
·Vol. 16
·期 1
·1-11
·
IF 15.7
Zhang Xiuxiu,Zhang Yuhao,Protsenko Bogdan O.,Soldatov Mikhail A.,Zhang Jing,Yang Chenyu,Bo Shuowen,Wang Huijuan,Chen Xin,Wang Chao,Cheng Weiren,Liu Qinghua
The development of non-iridium-based oxygen evolution reaction (OER) catalysts is crucial for proton exchange membrane water electrolysis (PEMWE), but hydrogen production remains a great challenge because of sluggish OER kinetics and severe catalyst dissolution. Here, we present a 4 f -induced covalent polarity modulation strategy for the construction of 4 f -orbital-modified RuO 2 (4 f -RuO 2 ) nanocatalysts with tunable Ru–O polarity. We find that the OER activity of 4 f -RuO 2 shows a volcano shape as a function of the polarity of Ru–O bond. Consequently, the best 4 f -Nd-RuO 2 catalyst possesses an ultra-low overpotential of 214 mV at 10 mA cm −2 and robust electrochemical stability in 0.1 M HClO 4 . Theoretical calculations coupled with in situ synchrotron infrared and X-ray absorption spectroscopy analyses reveal that the modulation of Ru–O polarity in RuO 2 by the valence f − p − d gradient orbital coupling can modify the adsorption energy of the reaction intermediates and suppress the participation of lattice oxygen to avoid over-oxidation of Ru, which can thus serve as an effective descriptor for fine tuning the activity and durability of acidic OER nanocatalysts.
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ACS Applied Nano Materials
·
2024
·
IF 5.3
Jie Huang,Xue Fan,Fei Yan,Jiyang Liu
Herein, we develop a simple electrochemical sensor based on the confinement effect of vertically ordered mesoporous silica film (VMSF) and the o-phenanthroline (Phen) chelating agent for ultrasensitive determination of ferrous ions (Fe2+). Fe(Phen)32+ obtained from the chelation between Fe2+ and Phen, shows higher electrochemical activity and larger geometric dimensions compared with free Fe2+, which could be effectively preconcentrated into the inner nanochannels of VMSF through spatial and electrostatic confinement effects. Differing from the conventional anodic stripping voltammetry, Fe(Phen)32+ could be enriched by convenient mechanical stirring and further detected by VMSF-modified indium tin oxide (VMSF/ITO), achieving an outstanding detection performance in terms of a linear range (1.0 nM–13.0 μM) and a limit of detection (LOD, 0.66 nM). Moreover, the established electrochemical sensor can accurately measure total iron and distinguish between different valence states (Fe2+ or Fe3+) with the help of reducing agents. Thanks to the outstanding antifouling ability of VMSF, the sensing platform consisting of VMSF/ITO and Phen chelating agent enables the precise determination of Fe2+ in complex real samples including tap water, pond water, FeSO4 tablets, and even colored samples, which can avoid the tedious sample pretreatment process and be applied in a wide range of scenarios.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2024
·
IF 7.7
Liying Huang,Di Zhang,Nitong Bu,Yuanbo Zhong,Pingping Tan,Huanglong Lin,Jie Pang,Ruojun Mu
In this work, pullulan (PUL) nanofibrous films incorporated with water-in-oil emulsions (PE) were prepared by microfluidic blowing spinning (MBS). The microstructures of nanofibers were characterized by scanning electron microscopy (SEM), fourier transform infrared (FT-IR), and X-ray diffraction (XRD). With the addition of W/O emulsions, the thermal stability, mechanical, and water barrier properties of PUL nanofibers were improved. Increases in emulsion content significantly affected the antioxidant and antimicrobial properties of nanofibrous films. ABTS and DPPH free radical scavenging rates increased from 10.26 % and 8.57 % to 60.66 % and 57.54 %, respectively. The inhibition zone of PE nanofibers against E. coli and S. aureus increased from 11.00 to 20.00 and from 15.67 to 21.17 mm, respectively. In addition, we investigated the freshness effectiveness of PE nanofibrous films on fresh-cut apples. PE nanofibrous films significantly maintained the firmness, and reduced the weight loss and browning index of the fresh-cut apple, throughout the 4 days of storage. Thus, the PE nanofibrous films exhibited good potential to prolong the shelf life of fresh-cut fruit and promote the development of active food packaging.
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ACS Sustainable Chemistry & Engineering
·
2025
·
IF 7.3
Shiqiang Liu,Bin Wang,Shihang Jin,Lin Zhang,Zhizhou Yang,Yue Wu,Sheng Gao
Silicone resins, known for their exceptional properties across various industries, are traditionally nonreprocessable due to their permanent cross-linked networks. Herein, we propose a method to turn a disadvantage into an advantage by converting silanol (Si–OH) groups─adverse factors for thermal stability─into dynamic Si–O–Ph bonds, thereby endowing silicone resin with reprocessability. Polysiloxane oligomers with benzoxazine side groups (PBTS) were formed via hydrolysis–condensation reactions between monofunctional benzoxazine-containing siloxane (P-mdes) monomers and triethoxymethylsilane (MTES). The curing behaviors of PBTS are analyzed using DSC and FTIR, confirming the formation of silicone resin-based covalent adaptive networks (CANs) through the introduction of dynamic Si–O–Ph bonds. The resulting silicone resin-based CANs exhibit reprocessability and significantly improved mechanical and thermal properties. The tensile strength of the original silicone resin-based CANs reaches 23.34 MPa, and even after five cycles of reprocessing, the strength remains at 22.98 MPa, demonstrating excellent mechanical retention. The Tg and Td5 of the silicone resin-based CANs reach up to 132 °C, 424 °C, and 425 °C in nitrogen or air atmospheres, respectively. Notably, the reprocessed samples maintain excellent heat resistance and thermal stability even after five reprocessing cycles, with Tg and Td5 values around 130 and 380 °C.
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危险品化学品经营许可证（带存储）