MOLECULES
·
2025
·Vol. 30
·期 13
·2691
·
IF 4.6
Jiuhu Zhao,Jingjing Jiang,Guanyu Chen,Meng Wang,Xiaoyuan Zuo,Yanjiao Bi,Rongshu Zhu
The selective catalytic reduction of NOxwith CH4(CH4-SCR) holds the potential to simultaneously abate harmful NOxand CH4greenhouse gases. In this study, a series of bimetallic M-In/H-SSZ-39 catalysts (where M represents Cr, Co, Ce, and Fe) were prepared via an ion exchange method and subsequently evaluated for their CH4-SCR activity. The influences of the preparation parameters, including the metal ion concentration and calcination temperature, as well as the operating conditions, such as the CH4/NO ratio, O2concentration, water vapor content, and gas hourly space velocity (GHSV), on the catalytic activity of the optimal Cr-In/H-SSZ-39 catalyst were meticulously examined. The results revealed that the Cr-In/H-SSZ-39 catalyst exhibited peak CH4-SCR catalytic performance when the Cr(NO3)3concentration was 0.0075 M, the In(NO3)3concentration was 0.066 M, and the calcination temperature was 500 °C. Under optimal operating conditions, namely GHSV of 10,000 h−1, 400 ppm NO, 800 ppm CH4, 15 vol% O2, and 6 vol% H2O, the NOxconversion rate reached 93.4%. To shed light on the excellent performance of Cr-In/H-SSZ-39 under humid conditions, a comparative analysis of the crystalline phase, chemical composition, pore structure, surface chemical state, surface acidity, and redox properties of Cr-In/H-SSZ-39 and In/H-SSZ-39 was conducted. The characterization results indicated that the incorporation of Cr into In/H-SSZ-39 enhanced its acidity and also facilitated the generation of InO+active species, which promoted the oxidation of NO and the activation of CH4, respectively. A synergistic effect was observed between Cr and In species, which significantly improved the redox properties of the catalyst. Consequently, the activated CH4could further interact with InO+to produce carbon-containing intermediates such as HCOO−, which ultimately reacted with nitrate-based intermediates to yield N2, CO2, and H2O.
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高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Jie Zhou,Siyuan Jin,Ruizhi Wu,Xiaochun Ma,Mengyao Pang,Zhe Yu,Guixiang Wang,Jinghuai Zhang,Boris Krit,Sergey Betsofen,Vitalii Neshchimenko,Buzikov Ruslan,Min Qiu,Yurong Yang,Jiaming Chen
Microarc oxidation (MAO) coatings incorporating hexagonal boron nitride (h-BN) nanoparticles were synthesized on Mg-Li alloys. The effects of h-BN nanoparticle concentration on the structure, phase composition, and tribological properties of the MAO coatings were systematically investigated. The results indicate that the addition of h-BN nanoparticles induces the formation of protrusions on the coating surface, varied in size and distribution with the concentration of h-BN particles. The protrusions are advantageous for enhancing the wear resistance of the coating, owing to the effective reduction of the contact area and the lubricating impact of the released h-BN particles during wear. The thickness and hardness of the coating contained h-BN particles are significantly elevated. At an optimal h-BN concentration of 7 g/L, the composite coating exhibits the lowest average coefficient of friction (COF = 0.59) and the minimum wear rate (W = 2.6 × 10 −6 mm 3 /N·m), thereby demonstrating superior tribological performance.
研究领域:
材料科学
·
表面工程
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高影响因子
JOURNAL OF PHYSICS D-APPLIED PHYSICS
·
2025
·Vol. 58
·期 20
·205501
·
IF 3.2
Fan Li,Chuansheng Zhang,Yi Luo,Xiaoxiao Kong,Cheng Zhang,Boxue Du,Tao Shao
Hexagonal boron nitride (h-BN) has emerged as a critical thermal management material in electrical insulation systems due to its superior thermal conductivity and dielectric properties. Nevertheless, suboptimal filler-matrix interfacial compatibility hinders both thermal conductivity enhancement and dielectric performance in composites. This study introduces an innovative plasma bubble treatment strategy, utilizing the discharge within bubbles to simultaneously achieve h-BN exfoliation and surface hydroxylation. By producing plasma in a 3% H2O2 solution with Ar/O2 mixed gas, hydroxyl groups are successfully grafted onto h-BN surfaces. This surface modification improves the silane grafting efficiency with KH560, resulting in improved filler dispersion within the epoxy resin (EP) and the introduction of deep charge traps in interfacial regions. Under 9.77 W discharge power, composites containing 20 wt% h-BN treated for 10 min exhibits optimal performance characteristics. The modified composite attains a 327% thermal conductivity of pure EP while showing superior dielectric properties with a 12.4% increase in breakdown strength relative to untreated composite. These findings present an effective surface engineering approach for developing high-performance polymer composites for electrical insulation applications.
研究领域:
材料科学
·
电气工程
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高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2025
·
IF 5.4
Xuanlin Li,Wenchao Shi,Xiner Li,Zhe Dong,Shili Zhao,Tian He,Yang Tong,Xiang Li,Beibei Chen
Creating high-quality and highly adaptable self-lubricating surfaces at the interface of mechanical components is significant in extending the lifespan of equipment. Due to the limitations of the performance of a single nanofiller, its enhanced polymer-based coatings often struggle to meet the requirements of harsh working environments. In this study, the 2D/2D nanohybrid of graphitic carbon-nitrogen (g-C 3 N 4 ) supporting h-BN nanosheets (BNNSs) was prepared using the facile calcination method. Furthermore, its tribological enhancement on epoxy (EP) composite coating was evaluated by sliding against 440 C steel ball. The “soft phase” of g-C 3 N 4 and “hard phase” of BNNSs in 2D/2D BNNSs/g-C 3 N 4 nanohybrid could integrate the multiple advantages and provide synergistic enhancement for epoxy self-lubricating composite coating. The BNNSs/g-C 3 N 4 demonstrated the optimal lubricating properties for EP compared to single BNNSs or g-C 3 N 4 . Compared with the pure EP coating, the friction coefficient and wear rate of the 0.5 wt% BNNSs/g-C 3 N 4 /EP coating were reduced by approximately 74.5 % and 80.9 %, respectively. The outstanding tribological properties of BNNSs/g-C 3 N 4 /EP were mainly due to the synergistic enhancement of BNNSs and g-C 3 N 4 nanosheets and the lubricating effect of high-quality transfer film.
研究领域:
材料科学
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表面工程
·
摩擦学
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高影响因子
Journal of Materials Chemistry B
·
2021
·Vol. 9
·期 15
·3401-3411
·
IF 6.331
Ming Wang,Miao Li,Yunli Wang,Yiran Shao,Yingchun Zhu,Shiping Yang
Hydroxyapatite (HA) has attracted wide attention for medical application due to its biocompatibility and bioactivity. However, the infection problems of HA remain among the leading reasons for implantation failure. Thus, it is urgent to endow HA biomaterials with antibacterial activity. Herein, the high antibacterial activity was achieved by introducing trace Mn3+ and H vacancy couples in HA through a facile heat-treatment strategy in air. The theoretical results indicated that Mn3+ was preferentially substituted for the Ca(2) site in the HA structure with a charge-compensating H vacancy appearing at the adjacent OH− site. The antibacterial tests showed that Mn-HA possessed antibacterial activity towards both E. coli and S. aureus with trace Mn content at the ppm level, and implied that Mn3+ and centers may play an important role in the antibacterial process. The Mn3+ and couples in Mn-HA, serving as oxidative and reductive centers respectively, could then collectively participate in the CoQ/CoQH2 redox cycling and synergistically facilitate the accumulation of CoQ˙− and ROS radicals. This enhanced ROS production was the main factor to endow Mn-HA with efficient antibacterial activity. Moreover, the in vitro bioactivity assay showed that Mn-HA materials exhibited enhanced osteogenic activity and good biocompatibility. Therefore, this work not only provides a feasible method to control the oxidation state of Mn elements in HA, but also proposes a novel trace Mn3+-doped HA for potential applications in tissue engineering.
研究领域:
材料科学
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生物材料
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生物医学工程
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PubMed
高影响因子
PROGRESS IN ORGANIC COATINGS
·
2020
·
IF 4.469
Hongyi Shi,Weiqu Liu,Chunhua Liu,Maiping Yang,Yankun Xie,Shuo Wang,Fengyuan Zhang,Liyan Liang,Ke Pi
Herein, h-BN powders were sonicated in an aqueous solution of polyethylenimine (PEI) to simultaneously exfoliate and functionalize h-BN nanosheets with Lewis acid-base interaction. The structure and morphology of PEI modified h-BN nanosheets (PEI-BNNSs) were characterized by FTIR, TGA, AFM and TEM. The as-prepared PEI-BNNSs were served as anticorrosive nanofillers for waterborne epoxy (EP) coatings on Q235 carbon steel. The corrosion behaviors of EP and PEI-BNNSs/EP coating systems in 3.5 wt % NaCl aqueous solution were evaluated by electrochemical workstation. It is worth noting that the protection efficiency (PE) values of 1 wt % PEI-BNNSs/EP and 2 wt % PEI-BNNSs/EP coating systems are as high as 99.99 % compared to EP coating systems. Moreover, the impedance modulus (|Z| f = 0.01 Hz ) of the 1 wt % PEI-BNNSs/EP coating system was 3–4 orders of magnitude higher than the EP coating after 90 days of immersion. The electrochemical results revealed that PEI-BNNSs can significantly enhanced the corrosion resistance of waterborne epoxy coatings.
研究领域:
材料科学
·
腐蚀与防护
·
纳米技术
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高影响因子
PROGRESS IN ORGANIC COATINGS
·
2017
·
IF 2.858
Fei Gao,Jiancheng Cao,Qibo Wang,Ren Liu,Shengwen Zhang,Jingcheng Liu,Xiaoya Liu
A series of ultraviolet (UV)-curable self-healing polyurethane (PU) oligomers were synthesized by incorporating different contents of 2-ureido-4[1H]-pyrimidone and polycarbonate diols (PCDL) with different molecular weights at the end of PU chains. The structure of the oligomers were determined through Nuclear magnetic resonance ( 1 H NMR) and Fourier transform infrared spectroscopy. The PU oligomers were used to produce UV-curable self-healing coatings, the properties of which were investigated and the properties of the coatings with different functionality were studied. The results revealed that the performance of the coating was higher when a higher molecular weight of PCDL was used and With functionality increasing, the crosslinking density of the coating ascends, resulting in higher self-healing temperature and upper pendulum hardness and gloss of the coating. To balance the self-healing ability and mechanical properties of the coating, a series of coating formulations were designed by adding different types and amounts of active diluents. Double bond conversion, thermostability, and self-healing ability were investigated to determine the effect of active diluents on coating performance. The results demonstrated that the resultant coating have excellent adhesion, gloss, and thermostability. Coatings prepared used all types of active diluents had favorable self-healing ability, except for that prepared using 2-acryloyloxymethyl-2-ethyltrimethylene diacrylate. Excellent self-healing and mechanical properties were obtained when 20 w.t.% of triethoxylated trimethylolpropane triacrylate was used.
研究领域:
材料科学
·
化学工程
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高影响因子
ACS ES&T Engineering
·
2026
·
IF 6.3
Xu Pan,Jiangkun Xie,Mingze Jiao,Liang Shan,Hongyuan Qi,Wenjun Huang,Zan Qu,Naiqiang Yan,Haomiao Xu
Methane selective catalytic reduction (CH4-SCR) represents a promising strategy for nitrogen oxides (NOx) abatement, yet its practical application is hindered by catalyst deactivation in the presence of water, caused by competitive adsorption on acid sites and irreversible hydroxylation of active metal species. In this study, we developed a dual-functional In@H-Beta/Fe2O3 catalyst through sequential ion-exchange and impregnation. This architecture confines indium species within the channels of H-Beta zeolite, while Fe2O3 nanoparticles are dispersed on the external surface, creating a synergistic system featuring a hydrophobic layer and strong Fe–O–In interfacial interactions. Under 5% H2O conditions, the optimized catalyst achieves 85% NOx conversion (vs 40% for conventional In@H-Beta). The enhanced water resistance is attributed to two factors: first, Fe2O3 establishes a physical barrier that protects acid sites and stabilizes InO+ active sites via Fe–O–In bonding, thereby inhibiting hydroxylation; second, strong interfacial Fe–O–In interactions further stabilize InO+ active sites against aqueous deactivation. Additionally, the Fe2+/Fe3+ redox cycle is proposed to facilitate O2 activation. In situ DRIFTS studies under 5% H2O confirm effective CH4 activation, as indicated by markedly more intense C–H stretching bands compared with In@H-Beta. The reaction pathway involves NO activation over Brønsted acid sites to form nitrate species, and CH4 activation on InO+ sites generating methyl radicals, which subsequently participate in NOx reduction. This work offers a new design strategy for developing highly active and water-tolerant CH4-SCR catalysts suitable for industrial flue gas treatment.
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高影响因子
Advanced Science
·
2026
·
IF 14.1
Kai Wang,Kai Jiang
An imbalance in the bone–vessel-coupled regeneration process is one of the key factors hindering the effective treatment of diabetic bone defects, which are rooted in the impaired function of mitochondria. Inspired by the bilayered heterogeneous structure of the periosteum, a bilayered, biomimetic, Janus piezoelectric scaffold (JPS) with endogenous piezoelectric effects was developed to regulate energy metabolism. JPS comprises a zinc-doped apatite–gelatin–poly-L-lactic acid membrane fabricated using electrospinning and integrated with a resveratrol-loaded microsphere composite hydrogel. Without requiring an external power source, JPS is designed to respond to local micromechanical stimulation and generate electroactive cues, while synergizing with the controlled release of resveratrol to regulate angiogenesis-related signaling and endothelial metabolic reprogramming. Single-cell sequencing indicated that bone microenvironment remodeling may be associated with H-type vessels, which are bone-specific microvasculatures. JPS provides a continuous power source in a high-sugar environment, thereby reconstructing the bone–vessel coupled regeneration process. JPS treatment stimulated the vascular features associated with H-type vessel-mediated bone regeneration in vascular organoids. The JPS group showed a substantially enhanced bone volume of 21.1% vs. 8.5% in the control in a diabetic calvarial defect model. This study presents an efficient material platform for addressing clinical challenges associated with diabetic bone regeneration.
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PubMed
高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
·
2026
·
IF 4.7
Baomin Wang,Haoxiang Yang,Chengcheng Fan,Fei Liu,Wenxin Lu
Alkali-activated materials show excellent capture capacity on heavy metals, but the mechanisms to immobilize heavy metals remain inadequately explored. This work investigated the main hydration product C-A-S-H gels for encapsulation of heavy metals such as Pb(II), Zn(II) and Cd(II). Furthermore, the adsorption behavior and mechanisms of Pb(II) in pore solutions by C-A-S-H were examined. These findings reveal that aluminum is incorporated into the silicon chains of C-S-H in the form of aluminum-oxygen tetrahedra, thereby generating C-A-S-H. The bonding ratio, which depends on the Ca/Si ratio, reaches its peak value of 0.139 when the Ca/Si ratio is 0.9. In highly alkaline environments, amphoteric Pb(II) and Zn(II) form hydroxyl coordination polyhedra, enhancing silicon chain polymerization, whereas Cd(II) is immobilized via ion exchange with Ca(II), resulting in solid solutions. For C-A-S-H with a Ca/Si ratio of 0.6, Pb(II) adsorption occurs predominantly through physical interactions. However, as the Ca/Si molar ratio increases, the effect chemisorption and ion exchange become more significant along with the formation of Pb 8 Ca(Si 2 O 7 ) 3 . C-A-S-H gel with a Ca/Si ratio of 0.9 has the highest Pb(II) adsorption capacity, reaching 92.55 mg/g.
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高影响因子
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
·
2026
·
IF 6.2
Kuan Gao,Qin Geng,Wenhui Zhang,Xin Li,Ping Tong,Anshu Yang,Zhihua Wu,Hongbing Chen
The effects of pH-shifting combined with quercetin binding on peanut Ara h 2 were evaluated using multispectroscopy, cell models, molecular simulation, and correlation analysis. After dual treatment, Ara h 2 exhibited significant structural changes, as evidenced by decreased intrinsic fluorescence and converted α-helix into β-sheet, leading to reduced IgE-binding capacity and diminished ability of dendritic cells and T cells to differentiate toward the Th2 pathway due to the masking of epitopes. Moreover, the binding sites of quercetin gradually shifted toward the hydrophobic core of Ara h 2 with pH changes, which inhibited fluctuations in the aa50–70 region. Finally, according to the correlation analysis, pH-shifting combined with quercetin binding may reduce the allergenicity of Ara h 2 by the migration of many Trp and Tyr residues to the protein surface, which disrupted the conformational epitopes. Therefore, this study provides an approach for the development of hypoallergenic peanut products.
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PubMed
高影响因子
ACTA PHYSICO-CHIMICA SINICA
·
2026
·
IF 13.5
Yafei Jiang,Shixing Xu,Qingze Ma,Jiaxuan Zhang,Weishuo Wang,Yanzhao Yang,Hao Tian
Converting glucose into value-added cyclic carbonates is a promising route for carbon utilization, and strongly influenced by the acidic properties and mass transport characteristics of solid acid catalysts. In this study, H-ZSM-5 nanosheets with varied Si/Al ratios were synthesized to investigate the effects of framework composition and b -axis length on glucose conversion. Increasing the Si/Al ratio decreased the density of acid sites but simultaneously reduced the b -axis length, enriched aluminum species near the external surface, and increased the relative abundance of Lewis acid sites, thereby enhancing the accessibility and utilization of active site. Consequently, H-ZSM-5_100 exhibited the highest site time yield, the lowest apparent activation energy, and the highest selectivity toward fructose and 5-hydroxymethylfurfural (5-HMF). Under optimized reaction conditions, H-ZSM-5_100 achieved a glucose conversion of 56.3% with a 5-HMF formation rate of 42.8 mmol h −1 g −1 . These results demonstrate that the catalytic performance of H-ZSM-5 nanosheets is governed by the synergistic effects of framework composition, the distribution of acid site, and crystal morphology, providing guidance for the rational design of zeolite catalysts for biomass conversion. Rational regulation of zeolite acidity and diffusion properties is crucial for efficient biomass conversion. This work presents H-ZSM-5 nanosheets with tunable Si/Al ratios are developed to reveal the synergistic effects of acid site distribution and b -axis length on glucose conversion, enabling enhanced production of fructose and 5-hydroxymethylfurfural through optimized active-site accessibility. Download: Download high-res image (175KB) Download: Download full-size image
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危险品化学品经营许可证（带存储）