JOURNAL OF FLUORESCENCE
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2025
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IF 3.1
Zhou Siqi,Ruan Chen,Hou Yuxian,Zou Lina,Wang Rong,Li Gaiping
Dopamine (DA), a crucial neurotransmitter, plays a pivotal role in various physiological and pathological processes, making the development of simple and novel detection methods highly significant. Herein, a facile ratiometric platform was constructed for ultrasensitive detection of DA based on the nanozyme facilitated in-situ fluorogenic reaction. Firstly, GMP-Ce 4+ CPs with enhanced oxidase-like activity were produced via an extremely simple one-step self-assembly method, which could efficiently initiate the fluorogenic reaction between DA and β-naphthol (β-NAP). Relying on the enhanced catalytic ability and the specificity of the fluorogenic reaction, a ratiometric platform was established by introducing rhodamine B (RhB) as a fluorescence reference. The proposed ratiometric method exhibited wide linear range (0.001-30 µM), ultra-high sensitivity (LOD 0.6 nM) and great selectivity. Finally, the designed method has been used for DA assay in practical health blood serum (HBS) samples with satisfactory results, demonstrating its potent analytical applicability in the biosensing field. Graphical
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CHINESE JOURNAL OF POLYMER SCIENCE
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2025
·
IF 4
Qian Yu-Ke,Feng Shao-Bo,Song Zi-Yuan
The preparation of polypeptide materials in continuous flow reactors shows great potential with improved reproducibility and scalability. However, conventional polypeptide synthesis from the polymerization of N -carboxyanhydride (NCA) is conducted at relatively slow rates, requiring long tubing or ending up with low-molecular-weight polymers. Inspired by recent advances in accelerated NCA polymerization, we report the crown-ether-catalyzed, rapid synthesis of polypeptide materials in cosolvents in flow reactors. The incorporation of low-polarity dichloromethane and the use of catalysts enabled fast conversion of monomers in 30 min, yielding well-defined polypeptides (up to 30 kDa) through a 20-cm tubing reactor. Additionally, random or block copolypeptides were efficiently prepared by incorporating a second NCA monomer. We believe that this work highlights the accelerated polymerization design in flow polymerization processes, offering the continuous production of polypeptide materials.
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CHINESE JOURNAL OF POLYMER SCIENCE
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2025
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IF 4
Liu He-Chen,Li Xiang-Qing,Zhou Xin-Xin,Tian Huai-Qing
The introduction of dynamic covalent bonds into the structure of epoxy resins can improve the degradation performance of the materials. But to a certain extent, it will affect the insulating properties of the resin, and how to balance the insulating properties and degradation performance has become an urgent problem. In this paper, the effects of different catalysts on the thermal-force-electrical properties of sorbitol-based resins were systematically investigated based on the dynamic ester bonding to construct the resin crosslinking network, and the biobased sorbitol glycidyl ether was used as the resin matrix. The experiments show that the resin system catalyzed by triethanolamine (TEOA) exhibits excellent comprehensive performance, which combines good thermal stability and mechanical properties with excellent electrical properties (breakdown field strength of 44.21 kV/mm and dielectric loss factor of 0.29%). In addition, chemical degradation tests were conducted on the resin systems with different catalysts, and the experiments showed that the produced resins could be degraded in benzyl alcohol and exhibited good degradation performance. This study provides a theoretical basis and technical path for the development of new bio-based electrical insulating materials with both high insulation and degradation properties, which is conducive to the popularization and application of bio-based resins in the field of electrical equipment.
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JOURNAL OF MATERIALS SCIENCE
·
2025
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IF 3.9
Zhang Peng,Xu Faou,Li Wen,Chen Weiyin,Zhang Wenxin,Zhang Tong
Self-healable and antibacterial electronic skins with the appropriate mechanical performance have paid great attention to the smart devices, health information storage and signal sensing. However, conventional electronic skins are susceptible to bacterial colonization and microbial adhesion, which poses additional health risks. Therefore, developing antibacterial elastic substrates with tailored morphological features is crucial for practical applications. Herein, a bioinspired photopolymerized self-healing antibacterial architecture is reported. Multifunctional trimethylolpropane triacrylate (TMPTA) was integrated with acrylate-terminated polydimethylsiloxane (PDMS-IU-MA) to fabricate a coral-like dendritic structure with particular convex wrinkles through sandpaper-mold templating, thereby imparting the antibacterial properties. With the increase in TMPTA content, the elastomer presents the progressive antibacterial abilities of inhibiting Escherichia coli ( E. coli ) and Staphylococcus aureus ( S. Aureus ) growth. Meanwhile, the introduction of multiple hydrogen bonds endows the elastomers with self-healing properties. Integrated with the flexible conductive circuit, a resistance-changed sensor with antibacterial and self-healing properties was developed for personalized motion monitoring, based on the PDMS-IU-MA elastomer. This work is expected to bring fresh horizons to the design of multifunctional sensing materials and establish the foundation for the development of antibacterial electronic skin. Graphical abstract
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CHINESE JOURNAL OF POLYMER SCIENCE
·
2025
·
IF 4
Ma Xiao-Jun,Hao Xiao-Qing,Wang Hong-Ji,Yao Han-Yu,Wang Zi-Qing,Lv Yin
The use of biomass feedstocks for the manufacture of high-performance polymers can help expand their range of applications and reduce their dependence on finite fossil resources. However, improving the heat resistance and hydrophilicity of bio-based polyesters remains a significant challenge. Herein, we introduce N,N′ - trans -1,4-cyclohexane-bis(pyrrolidone-4-methylcarboxylate) (CBPC), a novel bio-based tricyclic dibasic ester synthesized from renewable dimethyl itaconic acid and trans -1,4-cyclohexane diamine via an aza-Michael addition reaction. As a unique comonomer, CBPC features a rigid tricyclic backbone that significantly enhances chain packing and thermal stability, whereas its pyrrolidone side groups impart tunable polarity and improved hydrophilicity. Using CBPC, diphenyl carbonate, and 1,4-butylene glycol, a series of PBCC copolymers with 10 mol%–30 mol% CBPC was synthesized via ester-exchange and melt polycondensation methods. Incorporation of CBPC raised the melting temperature ( T m ) from 56.8 °C to 225.8 °C and the initial decomposition temperature ( T d5% ) from 258.0 °C to 306.7 °C, positioning PBCC among the most heat-resistant bio-based polyesters reported. Additionally, the pyrrolidone units enabled transformation from hydrophobic to hydrophilic. This study demonstrates that CBPC is an effective and innovative building block for the design of bio-based polymers with enhanced thermal and surface properties, offering a promising strategy for the development of high-performance sustainable materials.
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BMC BIOTECHNOLOGY
·
2025
·Vol. 25
·期 1
·1-18
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IF 3.4
Zhou Hang,Xie Lu Yi,Hu Jiu Ping,Zhou Li Hong,Lu Ling Qing,Yang Yi,Zhang Rong Rong,He Yun Xue,Ren Ming Zheng
During the fermentation of small-leaved Kuding tea by Aspergillus cristatus , significant fluctuations in environmental osmotic pressure can affect the growth and metabolism of A. cristatus , thereby influencing the quality of the fermented tea. To investigate osmotic pressure effects on its metabolism, this study used NaCl (0%, 4%, 8% and 12%) in small-leaved Kuding tea medium to establish osmotic gradients, followed by morphological observation, in vitro antioxidant activity assays, and liquid chromatography‒mass spectrometry (LC‒MS) nontargeted metabolomics analysis. The results demonstrated that the NaCl concentration had significant effects on colony morphology and metabolites. The colony diameters and antioxidant activities were significantly greater at 4% and 8% NaCl than at 0% or 12% NaCl. Nontargeted metabolomics identified 556 differential metabolites, 93 of which common differential metabolites covered seven categories, such as amino acids, organic acids and flavonoids. Under 4% NaCl, key antioxidants (melatonin, erythritol, and luteolin) significantly accumulated, which correlated with the activation of the core metabolic pathways, including tryptophan metabolism and flavonoid biosynthesis. Hypertonic stress (12% NaCl) suppressed these core pathways, leading to the induction of repair metabolites (e.g., methyl jasmonate). Low salt (0% NaCl) also inhibited core pathways, leading to a reduction in broad-spectrum antioxidant capacity and an accumulation of specific metabolites (e.g., xanthoxylin). Aspergillus cristatus dynamically regulates metabolism to adapt to different salt concentrations, with 4%-8% NaCl optimal for achieving maximal growth–antioxidant defense equilibrium in small-leaved Kuding tea. These findings provide a foundation for optimizing fermented tea processes and high-antioxidant products.
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Ecological Processes
·
2025
·Vol. 14
·期 1
·1-17
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IF 3.9
Zhang Hanyue,Du Yan,Pan Hongbing,Li Min,Hu Shiwen,Tang Yuanyuan,Wang Hanjie,Liu Xin,Hu Bin,Bao Weikai
Background Deforestation for terraced orchards, a common agricultural development pattern in mountainous ecosystems, drastically modifies soil physicochemical and biological properties. This conversion can affect soil microbial carbon use efficiency (CUE), which is a crucial indicator of soil carbon dynamics. However, the impact of this conversion on CUE remains unclear. Understanding how deforestation affects CUE will help predict soil carbon dynamics and guide the development of sustainable ecosystem strategies in fragile mountainous areas. Methods Herein, the response of CUE to environmental variations induced by deforestation for terraced orchards in an arid valley was explored. We quantified CUE using the 18 O-labeled water addition method. To identify the underlying driving factors, soil properties and microbial parameters were measured concurrently. Results Microbial CUE declined significantly after forest conversion to terraced orchards. Multiple factors, including soil micro-environmental conditions, stoichiometric traits, enzymatic properties, and microbial community attributes, were all closely associated with CUE. Furthermore, hierarchical partitioning analysis revealed soil stoichiometric traits as the primary drivers of CUE reduction, especially traits associated with the C:N and C:P ratios. During the conversion process, mechanical compaction and horizon inversion increased soil bulk density and clay content, thereby reducing soil aeration. These micro-environmental constraints were closely linked to intensified imbalances in the C:N and C:P ratios between microbes and soil. Along with the reduced soil C:N ratio, these stoichiometric shifts made it more difficult for microorganisms to obtain resources. Therefore, microbial C limitation intensified, soil microbes shifted from being primarily limited by P in forests to being co-limited by C and P in terraced orchards, which in turn stimulated greater microbial investment in resource-acquiring hydrolytic enzymes. Consequently, CUE declined because microbial growth decreased more significantly than microbial respiration. Conclusion In summary, deforestation for terraced orchards in the arid valley reduced CUE by constraining soil micro-environments and resource conditions. These findings advance our understanding of CUE variations following deforestation and have important implications for soil carbon cycling in vulnerable mountain ecosystems.
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CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
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2025
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IF 3
Zhang Wen,Zhang Ning,Gao Jianyang,Liu Fusheng,Zhang Yang,Xu Guang-Rui,Wang Lei
Recently, zinc-air batteries have been of great interest due to their high theoretical specific energy that plays an important role in renewable energy conversion, while the sluggish kinetics of their half-reactions of oxygen reduction and oxygen evolution (ORR/OER) limit their widespread applications. Herein, we report the synthesis of self-assembly Ni@PdNiO x seashell-like nanostructures (Ni@PdNiO x NSs) with low Pd content through a novel one-step wet chemical method for the first time. The optimized self-assembly Ni@PdNiO x NSs with a thickness of 2.06 nm are connected self-assembled to form a network structure, which exhibits a large surface area and unprecedented ORR/OER with a positive half-wave potential of 0.892 V vs. RHE and an overpotential of 230 mV at 10 mA/cm 2 in alkaline solution, outperforming most of the PdNi catalysts. When the self-assembly Ni@PdNiO x NSs are applied as electrodes for zinc-air batteries, they deliver a high power density of 88.9 mW/cm 2 and an impressive energy density of 714 mA·h·g −1 . This work opens up a new strategy for generating superior oxygen electrocatalysis and provides new insight into the correlation of low Pd content and Ni in the improvement of alkaline oxygen electrocatalysis.
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CATALYSIS LETTERS
·
2025
·Vol. 155
·期 11
·1-15
·
IF 2.4
Yang Dawei,Hu Yanan,Qi Zhiwei,Li Qiaoling,Yu Chengcheng
The world is currently facing the dual challenges of energy scarcity and environmental degradation. As a highly promising carrier of clean and renewable energy, hydrogen has attracted significant attention, with high-efficiency water electrolysis recognized as a key pathway for the large-scale production of green hydrogen. Among various electrocatalysts, transition metal Co-V-based materials demonstrate remarkable potential. In this study, we successfully synthesized a highly stable amorphous Co-V-B catalyst on a nickel foam (NF) substrate by constructing a Co-V bimetallic system followed by boron doping to enhance its performance. Electrochemical evaluations indicated that the catalyst delivers superior Hydrogen evolution reaction (HER) performance, requiring only 47 mV overpotential to attain a current density of − 10 mA cm −2 , along with a low charge transfer resistance of 1.14 Ω. Additionally, the catalyst demonstrated remarkable durability, sustaining stable HER activity during 16 h of continuous chronopotentiometric (CP) operation. This study systematically explores the preparation of Co-V/NF catalysts and highlights the significant impact of boron incorporation on improving catalytic performance, providing meaningful guidance for developing advanced electrocatalysts for water splitting applications. Graphical
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MICROCHIMICA ACTA
·
2025
·Vol. 192
·期 7
·1-14
·
IF 5.3
Zou Na,Li Xin,Xu Meiling,Wang Zhaoxia,Zhang Junhua,Wang Xueliang
In the direct electrochemical sensing of endogenous hydrogen sulfide, the utilization of triple-pulse amperometry (TPA) enables the delivery of distinct cleaning and measurement pulses, effectively mitigating electrode surface passivation due to sulfur deposition. In order to further improve the sensor’s sensitivity and selectivity, gold nanoparticles(nano-Au), platinum nanoparticles (nano-Pt), and poly(3,4-ethylenedioxythiophene) (PEDOT) were separately employed to modify electrodes for constructing electrochemical sensors. Their performance in detecting hydrogen sulfide was evaluated using constant potential amperometry (CPA) alongside TPA. Selectivity coefficients were determined based on current responses to hydrogen sulfide as well as four major interfering substances: ascorbic acid (AA), dopamine (DA), uric acid (UA), and epinephrine (EP). After quantitative comparison, the optimal solution for direct electrochemical sensing of hydrogen sulfide involved employing a PEDOT/nano-Au composite film in conjunction with TPA technology. The sensor responds to hydrogen sulfide in the concentration range 3.0–24.0 µM with a detection limit of 0.035 µM. Furthermore, the sensor demonstrates excellent repeatability and stability, rendering it suitable for continuous electrochemical monitoring of hydrogen sulfide in simulated real biological environments. Graphical
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高影响因子
CHEMICAL PAPERS
·
2025
·
IF 2.5
Gu Peng
Dielectric composites with high dielectric constant, minimal dielectric loss and low conductivity can well serve for energy storage capacitors. High dielectric loss is not favorable due to large energy waste. Here, to improve dielectric constant of poly(vinylidene fluoride–hexafluoropropylene) by electric percolation, semiconducting NiO filler was added to form composites. However, high leakage current from interfaces can lead to high dielectric loss. Doping insulating α-Al 2 O 3 particles with stable structure, low chemical activity and high modulus into above binary composites can reduce dielectric loss. By changing NiO dose, dielectric constant was well tailored. Dose of α-Al 2 O 3 was left unchanged. Dielectric loss, conductivity and dielectric constant of composites were measured. By the same NiO loading, dielectric loss, conductivity and dielectric constant in ternary composites can be reduced, compared with binary composites. The optimal ternary composite should contain 35 wt% NiO and 4 wt% α-Al 2 O 3 . Optimized dielectric traits of this composite can be reflected by dielectric constant of ~ 64 and dielectric loss of ~ 0.27 under 100 Hz electric field.
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TRANSACTIONS OF TIANJIN UNIVERSITY
·
2025
·
IF 8.5
Huang Xiaorui,Zhang Wei,Xiao Liyang,Han Chunyan,Liu Ying,Zhang Jingtong,Tan Haiwen,Yin Pengfei,Zhang Rui,Dong Cunku,Liu Hui,Du Xiwen,Yang Jing
NiFe(oxy)hydroxide (NiFeOOH) has been widely studied as a catalyst for oxygen evolution reaction (OER), but its activity is still not satisfactory. Although metal doping has been employed as a promising strategy for addressing this issue, the instability and leaching of the high-valence dopant metals remain considerable challenges. Herein, an array of Cr-doped NiFeOOH nanosheets was in situ synthesized on nickel foam via a one-step hydrothermal method. The doping of NiFeOOH with Cr was found to induce partial electron transfer from Ni and Fe to Cr atoms, thereby modulating the electronic structure of the catalyst and enhancing its intrinsic activity. Electrochemical and in situ Raman spectroscopy analyses showed that Fe active sites with lower charge density enhance the adsorption of *OH and reduce the formation energy barrier of the *OOH intermediate during OER, thereby accelerating the OER. Moreover, Fe was found to promote the transfer of additional electrons to Cr, leading to electron accumulation at Cr sites. This electron accumulation effectively prevents Cr from excessive oxidation and leaching under anode potentials, thereby maintaining the structural stability of the catalyst. The optimized Cr-doped NiFeOOH self-supported electrode exhibited a current density of 50 mA/cm 2 with an overpotential of only 239 mV and remained stable for 100 h at 600 mA/cm 2 in 1 mol/L KOH.
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