ANALYTICAL LETTERS
·
2025
·
IF 1.8
Yunna Li,Fan Qi,Jinsong Liu,Yunfei Zhao,Jiale Fang,Xueliang Li,Kezhi Jiang
Ethephon (ETH) is a widely used plant growth regulator in fruit production. Due to its harm to people’s health, its content is an important indicator for fruit quality control. However, due to the extremely high polarity and acidity, as well as the absence of chromophores, efficient and simple detection of ETH remains challenging. In this work, a convenient method for determining trace ETH in fruit was developed that involved a combination of catalytic methylation and gas chromatography-mass spectrometry (GC-MS) analysis. ETH in fruit was extracted with acetonitrile and derivatized with (trimethylsilyl) diazomethane (TMSD) by the catalysis of trimethylchlorosilane to generate methylated ETH (ETH-M) which was determined by GC-MS. The instrumental linear range of ETH was 10–1000 µg/L with a coefficient of determination (R2) > 0.999. The limit of detection (LOD) of the method was 1.0 µg/kg. The ETH content in 12 types of fruits was determined with a reasonable recovery rate ranging from 83.20 ± 0.05% to 118.21 ± 0.01%. The ETH content in the unwashed fruits was in the range of undetectable (ND) to 111 µg/g and below the LOD in their flesh. After washing, the content was significantly reduced and even undetectable. The established method showed good efficiency, selectivity, and reproducibility, and can be used for the determination of ETH in various fruits.
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高影响因子
Journal of Materials Chemistry A
·
2020
·Vol. 9
·期 5
·2784-2791
·
IF 11.301
Qijun Pei,Teng He,Yang Yu,Zijun Jing,Jintao Wang,Khai Chen Tan,Jianping Guo,Lin Liu,Hujun Cao,Ping Chen
The water–gas shift (WGS) reaction is a key chemical process for CO removal and hydrogen generation in which CO and H2O are converted to CO2 and H2. The activation of H2O at the oxygen vacancy sites of a reducible oxide-supported catalyst is widely viewed as the critical step for this reaction. However, the strategy of rational fabrication of oxygen vacancies in reducible oxides to boost catalytic activity is rarely reported. Here, we report a facile method to fabricate oxygen vacancies through assembling an amorphous titanate overlayer on the surface of TiO2 support via alkali doping, aiming to improve its activity in WGS reaction. TEM, EPR, H2-TPR and XPS results verified that the titanate overlayer is in situ formed via alkali doping, where oxygen vacancies can be rationally regulated during reduction through tuning the amount of alkali. The ease of oxygen vacancy formation induced by alkali doping could be attributed to the lower Ti–O bond energy in titanate. It is shown that sodium-doped Ni/TiO2 with titanate overlayer on the support exhibited superior activity in WGS reaction compared with undoped catalyst, i.e., around threefold greater activity compared with undoped catalyst was achieved at 300 °C. Furthermore, the formation of CH4, a common side reaction in WGS on Ni-based catalysts, is suppressed on the sodium-doped Ni/TiO2. More importantly, the titanate overlayer strategy is successfully extended to other reducible oxide-supported catalysts, which provides a universal method to fabricate oxygen vacancies in reducible oxide-supported catalysts.
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高影响因子
Nanoscale
·
2016
·Vol. 8
·期 36
·16349-16356
·
IF 7.76
Fengdong Qu,Huifang Jiang,Minghui Yang
The rational design of nanoscale metal oxides with hollow structures and tunable porosity has stimulated tremendous attention due to their vital importance for practical applications. Here, we report the designed synthesis of ZnO/ZnCo2O4 hollow core–shell nanocages (HCSNCs) through a metal–organic framework (MOF) route. The strategy includes the synthesis of a zeolite imidazolate framework-8 (ZIF-8)/Co–Zn hydroxide core–shell nanostructure precursor and subsequent transformation to ZnO/ZnCo2O4 HCSNCs by thermal annealing of the as-prepared precursor in air. Various techniques were employed for characterization of the structure and morphology of the as-prepared ZnO/ZnCo2O4 HCSNCs. When applied as a gas sensing material, the ZnO/ZnCo2O4 HCSNCs show enhanced sensitivity to xylene when compared with ZnCo2O4 shells as well as ZnO nanocages (NCs). In addition, excellent reversibility and superior selectivity of the sensor were observed. The remarkable enhancement in the gas-sensing properties of the ZnO/ZnCo2O4 HCSNCs is attributed to their unique structure and a synergistic effect of ZnO and ZnCo2O4.
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高影响因子
KOREAN JOURNAL OF CHEMICAL ENGINEERING
·
2017
·Vol. 35
·期 2
·394-408
·
IF 2.007
Lv Xiao,Xiao Jun,Sun Tingting,Huo Xiaodong,Song Min,Shen Laihong
Tar is a barrier to limit the development of biomass gasification. Catalytic steam reforming experiments using α -methylnaphthalene (MNP) as a model tar compound were carried out in the two-stage reactor system (TSR). Based on response surface methodology, the effects of TSR temperatures and the molar ratio of steam to carbon (S/C) on MNP reforming performances were analyzed using the Li-modified Ni-based catalyst (NBC). The results show that the proper introduction of H 2 is able to improve significantly the MNP conversion, specially at lower temperatures. Furthermore, it is more appropriate for the modified catalysts by Li and Mg to be loaded in the first reactor due to their significant promotion to hydrocracking reactions, and it is favorable to place the Ni/Al catalyst in the second reactor for H 2 -rich gas. Additionally, the carbon deposition resistance of the NBC modified by Li exhibits better than that of the NBC modified by Mg.
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高影响因子
JOURNAL OF PHYSICAL CHEMISTRY A
·
2024
·
IF 2.7
Alexander M. Mebel,Wang Li,Luna Pratali Maffei,Carlo Cavallotti,Alexander N. Morozov,Chang-Yang Wang,Jiu-Zhong Yang,Long Zhao,Ralf I. Kaiser
To understand the reactivity of resonantly stabilized radicals, often found in relevant concentrations in gaseous environments, it is important to determine their main reaction pathways. Here, it is investigated whether the fulvenallenyl radical (C7H5·) reacts preferentially with closed-shell molecules or radicals. Electronic structure calculations on the C10H9 potential energy surface accessed by the reactions of C7H5· with methylacetylene (CH3CCH) and allene (H2CCCH2) were combined with RRKM-ME calculations of temperature- and pressure-dependent rate constants using the automated EStokTP software suite and kinetic modeling to assess the reactivity of C7H5· with closed-shell unsaturated hydrocarbons. Experimentally, the reactions were attempted in a chemical microreactor heated to 998 ± 10 K by preparing fulvenallenyl radicals via pyrolysis of trichloromethylbenzene (C7H5Cl3) and seeding the radicals in methylacetylene or allene carrier gas, with product identification by means of photoionization mass spectrometry. The measured photoionization efficiency curve of m/z = 128 was assigned to a linear combination of the reference curves of two C10H8 isomers, azulene (minor) and naphthalene (major), presumably resulting from the C7H5· plus C3H4 reactions. However, the calculations demonstrated that these reactions are too slow, and kinetic modeling of processes in the reactor allowed us to conclude that the observation of naphthalene and azulene is due to the C7H5· plus C3H3· reaction, where propargyl is produced by direct hydrogen atom abstraction by chlorine (Cl) atoms from allene or methylacetylene and Cl stem from the pyrolysis of C7H5Cl3. Modeling results under the copyrolysis conditions of toluene and methylacetylene in high-temperature shock tube experiments confirmed the prevalence of the fulvenallenyl reaction with propargyl over its reactions with C3H4 even when the concentrations of allene and methylacetylene largely exceed that of propargyl. Overall, the reactions of fulvenallenyl with both allene and methylacetylene were found to be noncompetitive in the formation of naphthalene and azulene thus attesting the inefficiency of the fulvenallenyl radical reactions with the prototype closed-shell hydrocarbon species. In the meantime, the new reaction pathways revealed, including H-assisted isomerizations between C10H8 isomers and decomposition reactions of various C10H9 isomers, emerge as relevant and are recommended for inclusion in combustion kinetic models for naphthalene formation.
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高影响因子
ACS Sensors
·
2026
·
IF 10.9
Yang Ting,Jiao Yang,Ma Yali,Lang Dajun,Cheng Liang,Wang Tingting,Ma Lin
Accurately resolving trace acetone against the highly humid background of exhaled breath remains a central obstacle to non-invasive diabetes diagnosis. Here we develop a metal–organic framework (MOF)-conversion-induced prenucleation strategy for the controlled construction of Fe 2 TiO 5–δ (FTO) solid solutions. During the topological transformation of MIL-125(Ti), Ti-derived oxide nuclei form within the pores of a daughter Fe-based MOF, enabling the generation of FTO enriched with mixed-valence Fe 3+ /Fe 2+ and Ti 4+ /Ti 3+ centres and abundant oxygen vacancies. The optimized FTO-3.49 sensor selectively detects acetone across 30–90% relative humidity, reaches a detection limit of 100 ppb and distinguishes ppb-level acetone concentrations in simulated exhaled breath. This performance is underpinned by mixed-valence centres that limit water-induced hydroxyl accumulation and oxygen vacancies that create additional adsorption sites and strengthen acetone binding, as supported by spectroscopic and computational evidence. This defect–valence synergy enables stable acetone sensing under highly humid conditions and provides a materials-design route towards humidity-resilient metal-oxide sensors for breath-acetone analysis.
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高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2026
·
IF 5.4
Weiwei Han,Tianyu Shi,Chao Ma,Chenwei Liu,Sanbao Dong
Foam drainage is a critical technique for enhancing gas production in water-producing natural gas wells during mid-to-late operational stages. In this study, we hypothesized that constructing a pseudo-Gemini supramolecular surfactant complex through non-covalent interactions between a hydroxy tertiary amine (HTA) and 2-hydroxyterephthalic acid (HTPA) would significantly enhance foam stability and liquid-carrying performance under harsh downhole conditions. To realize this, we developed a novel five-component foam drainage agent by integrating the HTA/HTPA complex with cocamidopropyl betaine (CAPB), α-olefin sulfonate (AOS), and sodium carboxymethyl cellulose (NaCMC). The optimized molar ratio and total dosage of HTA:HTPA:AOS:CAPB:NaCMC were found to be 12:6:42:40:25 and 15 mM/L respectively, at which this foaming system exhibited a foaming volume of 390 mL and a half-life time of 23.07 min. Critically, liquid-carrying rate tests demonstrated that moderate contents of condensate and methanol enhanced drainage efficiency, the presence of 30 % condensate yielded a liquid-carrying rate of 43.06 %, while the presence of 20 % methanol increased it to 47.10 %. Remarkably, the system maintained 100 % foaming efficiency over a wide range of methanol or condensate concentrations (0–50 % v/v). This foaming system also exhibited excellent tolerance to salinity (up to 300 g/L, enabled by nitrilotriacetic acid) and temperature (up to 90 ℃), at which produced a liquid-carrying rate of 91.98 % while foaming efficiency remained at 100 % across 20–90 ℃. Besides, surface tension measurements, shear viscosity tests, microscopic foam morphology analysis, interaction energy calculations, and electrostatic surface potential analyses confirmed strong synergistic effect among the components. These findings validate the rational design of the supramolecular system and underscore its high potential as a novel foam drainage agent for efficient gas well deliquification.
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高影响因子
BIOMACROMOLECULES
·
2026
·
IF 5.9
Xin Pan,Qingpeng Ou,Zhaoyang Wei,Jie Liu,Chao Chen,Jun You,Zhao Wang,Dean Shi,Weiwei Lei,Liqun Zhang,Robert K. Y. Li
Abstract The bio-based monomer 2,5-furandicarboxylic acid (FDCA) endows thermoplastics such as poly(ethylene furanoate) with superior gas barrier properties. However, its application and mechanistic role in cross-linkable elastomers remain underexplored. To examine the possible contribution of the furan oxygen within this compositional framework, we synthesized partially bio-based, cross-linkable polyester elastomers with varied FDCA-to-isophthalic acid (IPA) ratios. IPA, sharing a similar nonlinear geometry but lacking the oxygen heteroatom, served as an internal reference. The synthesized elastomers exhibited high molecular weights (Mn ≥ 24,800 g/mol) and excellent thermal stability (Td,5% up to 359 °C). Dynamic mechanical analysis showed that increasing FDCA content was accompanied by suppressed β-relaxation; specifically, the IPA-based reference showed a β-relaxation peak area 1.8 times larger than that of the FDCA-rich elastomer. Correspondingly, the oxygen permeability coefficient decreased substantially from 1.99 to 0.81 Barrer as the FDCA content increased from 0 to 60 mol %. These results support an important contribution of the oxygen-containing furan unit to restricted local segmental dynamics and improved oxygen barrier performance in cross-linked copolyester elastomers. This work provides a composition-based design strategy for sustainable elastomers requiring both elasticity and gas barrier properties.
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高影响因子
RARE METALS
·
2026
·Vol. 45
·期 10
·e70594
·
IF 12.1
Xingyu Wang,Haixia Zhou,Miaomiao Li,Pengcheng Xu,Zhongxiao Zhang,Yuanshuai Fu,Yuan Zhang,Yongheng Zhu
en This link goes to a English section zh This link goes to a Chinese section Developing rapid, precise gas sensors for Listeria monocytogenes ( LM ) biomarker detection faces challenges due to suboptimal gas-solid interactions. Herein, we report the rational synthesis of amino-functionalized mesoporous SiO 2 hollow nano-doughnuts (MS-2-NH 2 -2) via modification with (3-aminopropyl) trimethoxysilane (AAPTMS), which enables exceptional detection performance for the LM biomarker 3-hydroxy-2-butanone (3H2B). The MS-2-NH 2 -2-based quartz crystal microbalance (QCM) sensors exhibited high sensitivity (1980 Hz@50 ppm 3H2B), effective selectivity, low detection limit (100 ppb), rapid response/recovery kinetics (9/10 s), good repeatability, and outstanding humidity resistance. Furthermore, to enhance the selectivity performance of MS-2-NH 2 -2 in practical applications, the K-nearest neighbor algorithm is implemented to identify 3H2B, single interfering gases, and mixed gases. These performances stem from AAPTMS-derived amino groups, mesoporous structure, and doughnut-like hollow morphology, which enhance gas-material interactions. Temperature-programmed experiments revealed a −45.18 kJ mol −1 enthalpy change, confirming reversible chemisorption between MS-2-NH 2 -2 and 3H2B. In situ DRIFTS confirmed selective detection driven by –NH 2 –carbonyl interactions. Additionally, practical validation in complex food matrices demonstrates the sensor's capability for real-time 3H2B monitoring with high accuracy and reliability, suggesting its potential as a rapid, field-deployable screening tool for LM prioritization in food safety applications. 摘要 en This link goes to a English section zh This link goes to a Chinese section 在开发针对单增李斯特菌( Listeria monocytogenes , LM )生物标志物检测的快速响应与精准识别气体传感器过程中,因气体分子与固体传感器界面间的相互作用效率低下,导致检测灵敏度与特异性提升面临显著技术挑战。本研究通过(3-氨丙基)三甲氧基硅烷(AAPTMS)改性,成功合成了氨基功能化空心介孔SiO 2 纳米甜甜圈(MS-2-NH 2 -2),实现了对 LM 生物标志物3-羟基-2-丁酮(3H2B)的高效检测。基于MS-2-NH 2 -2的石英晶体微天平(QCM)传感器表现出高灵敏度(1980 Hz@50 ppm 3H2B)、高选择性、低检测限(100 ppb)、快速响应/恢复动力学(9/10秒)、良好重复性和优异抗湿性。为提升MS-2-NH 2 -2在实际应用中的选择性表现,引入K近邻算法实现了对3H2B、单一干扰气体及混合气体的精准识别。这些优异性能源于AAPTMS衍生的氨基基团、介孔结构及甜甜圈状空心形貌的协同作用,增强了气体-材料相互作用。程序升温实验计算得出的焓变值(−45.18 kJ mol −1 ),证实了MS-2-NH 2 -2与3H2B之间存在可逆化学吸附。原位漫反射红外傅里叶变换光谱(DRIFTS)验证了氨基-羰基相互作用驱动的特异性检测机制。在复杂食品基质中的实际应用验证表明,该传感器可实现3H2B的即时检测,展现出高精度与可靠性,彰显了其作为快速、精准且可现场部署的 LM 检测工具在食品安全领域的巨大应用潜力。
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高影响因子
Biomaterials Advances
·
2026
·
IF 6.7
Jiaqi Zhou,Jingjing Yu,Tianshuo Hu,Jingyi Li,Cuicui Ding,Lihui Chen,Min Zhang
COL and GO/BNN6 integrated into PVA matrix via low-temperature foaming • Sponge combines NPWT, photothermal therapy, and gas therapy functions. • It achieves excellent drainage capacity, wet resilience and photothermal conversion. • NIR-triggered NO release enables synergistic antibacterial effect (>96% inhibition). • In vivo results confirm accelerated wound closure and enhanced tissue regeneration. Polyvinyl alcohol (PVA) sponges are widely utilized as wound dressings, yet they face limitations in clinical practice, particularly in addressing bacterial infection. Herein, a multifunctional composite sponge dressing is developed by incorporating collagen (COL) and a graphene oxide (GO)/BNN6 (a nitric oxide (NO) donor) assembly into a PVA matrix. The resulting GO/BNN6/PVA/COL composite sponge exhibits a three-dimensional porous network, high porosity, excellent liquid absorption, and favorable shape retention. Benefiting from these features, the composite sponge demonstrates efficient negative pressure drainage performance in vitro, achieving a drainage flux of 3515.0 mL·s −1 ·m −2 at 16 kPa, indicating its potential applicability for negative pressure wound therapy (NPWT). Moreover, under near-infrared (NIR) irradiation, GO provides significant photothermal conversion, allowing the sponge to serve as a photothermal therapy (PTT) agent. The localized heat simultaneously triggers the controlled release of NO from BNN6, yielding a combined photothermal and NO-mediated antibacterial effect with inhibition rates exceeding 96% against Escherichia coli ( E. coli ) and Staphylococcus aureus ( S. aureus ). Notably, in vivo experiments demonstrate that the GO/BNN6/PVA/COL sponge under NIR irradiation effectively suppresses infection, accelerates wound closure, and promotes granulation tissue formation and skin regeneration. This work presents a versatile sponge dressing that combines the key functions required for NPWT, on-demand PTT, and gas-based antibacterial treatment, demonstrating promising potential for advanced wound management. Download: Download high-res image (170KB) Download: Download full-size image
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PubMed
高影响因子
Materials Today Bio
·
2026
·
IF 11
Jun Ren,Peng Chen,Chun Sun,Hao Gao,Chenyu Li,Fangzheng Wang,Yuan Zhai,Yuting Zhang,Wen Luo,Chaoli Wang,Yunfei Zhang
The multifactorial pathogenesis of diabetic foot ulcers (DFUs) poses significant challenges to effective clinical management. To address this complexity, we have developed a multi-functional ionic composite hydrogel designed to concurrently target four key pathological factors of diabetic wounds. The system integrates: (1) hollow mesoporous silica nanoparticles (HMSNs) encapsulating glucose oxidase (GOx), which protect the enzyme from inactivation in the hyperglycemic and inflammatory wound microenvironment, enabling sustained glucose regulation; (2) L-arginine (LArg), which reacts with the hydrogen peroxide (H 2 O 2 ) byproduct of GOx catalysis to generate nitric oxide (NO), thereby promoting angiogenesis; and (3) an ionic liquid (IL) composed of FeCl 3 and dodecyl dimethyl benzyl ammonium chloride (DDBAC). The [DDBAC] + cation exerts broad-spectrum antibacterial effects via membrane disruption, while the [FeCl 4 ] - anion helps maintain iron homeostasis to support nerve regeneration. Notably, beyond integrating enzymatic glucose control, gas-therapy-mediated angiogenesis, and potent antibacterial action, this work innovatively incorporates a dedicated strategy for peripheral nerve repair. We propose that this combinatorial approach promotes healing by upregulating pro-regenerative pathways (e.g., Angptl4/VEGFA, BDNF/NGFR, FGF2/VEGFA) and inhibiting the deleterious SPINK12/THBS1 axis, offering a transformative multi-target therapeutic platform for DFUs.
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DOI
PubMed
高影响因子
JOURNAL OF POWER SOURCES
·
2026
·
IF 8.4
Tianen Wu,Qian Song,Huiyuan Liu,Weiqi Zhang,Qian Xu,Huaneng Su
Optimizing the microporous layer (MPL), a key component of gas diffusion layer (GDL) in proton exchange membrane fuel cells (PEMFCs), is a promising strategy for enhancing water removal and ensuring long-term stable operation at high current densities. This study proposes a dual-MPL (VXC72-G-MPL), fabricated by sequentially depositing graphene layer and Vulcan XC72 (VXC72) layers onto a macroporous substrate (MPS). Measurements reveal that the graphene layer provides superior thermal conductivity while effectively mitigating MPL penetration into the MPS. Furthermore, the architecture establishes a hierarchical pore-size gradient, transitioning from mesopores to micropores from the MPS toward the catalyst layer (CL). These synergistic features accelerate liquid water transport efficiency within the GDL. In PEMFC tests, the VXC72-G-MPL membrane electrode assembly (MEA) demonstrates robust performance under 100%, 125%, and 150% relative humidity (RH), yielding voltages of 0.41 V, 0.42 V, and 0.36 V at 2 A cm −2 , respectively, significantly outperforming the conventional VXC72-MPL. Furthermore, after a 24 h accelerated steady-state test (0.4 V, 60 °C, and 150% RH), the VXC72-G-MPL MEA shows only 1.7% performance loss, a substantial improvement over the 15.3% decay for the VXC72-MPL MEA. The superior performance and stability confirm the excellent water removal capacity of the proposed dual-layer MPL architecture.
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高影响因子
危险品化学品经营许可证（带存储）