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core-shell structure Co3O4@TiO2 composite with enhanced visible light photocatalytic and antibacterial activity

JOURNAL OF MOLECULAR structure 2025年 1320卷

作者： Shi, Jiazi Xue, Kexin Liu, Yanchi Sun, Mohan Fu, Yabo Wang, Diangang Lin, Meichen Jin, Yingjie Wei, Jiaqi Beijing Inst Graph Commun Beijing Key Lab Printing & Packaging Mat & Technol Beijing 102600 Peoples R China Shandong Univ Sch Mat Sci & Engn Jinan 250061 Shandong Peoples R China

Water pollution caused by industrial organics is one of the paramount concerns worldwide. Therefore, providing more durable and efficient visible light photocatalysts for water treatment is an urgent demand. In this work, a novel core-shell structure Co3O4@TiO2 photocatalyst has been successfully prepared by pyrolyzing a template of zeolitic imidazolate framework-67 (ZIF-67) coated with TiO2. The Co3O4@TiO2 composite exhibits a dodecahedral structure with small particles modified on its surface. It is found that the band gap of the Co3O4@TiO2 composite is narrower than that of TiO2, indicating enhanced visible light absorption capacity and improved carrier separation efficiency. Compared to the TiO2 and Co3O4, Co3O4@TiO2 exhibits the lower photoluminescence spectral intensity and smaller electrochemical impedance spectra curve radius, indicating the lower rate of recombination for photogenerated electrons and holes and the quicker transfer of charges at the interface. Under visible light irradiation, the Co3O4@TiO2 composite demonstrated effective degradation rate of 91 % for a 10 mg/L methylene blue solution within 120 min, which was 2.5 times that of Co3O4 and 1.2 times that of TiO2, respectively. Furthermore, the Co3O4@TiO2 composite achieved complete degradation of a 10 mg/L methylene blue solution within 180 min. In addition, the Co3O4@TiO2 composite exhibited excellent photocatalytic stability with recyclability, as well as good photocatalytic antibacterial properties. This study provides a novel core-shell structure Co3O4@TiO2 photocatalyst which has enormous potential in organic degradation and antibacterial applications.

关键词： core-shell structure Photocatalyst Visible light Antibacterial properties

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core-shell structure-Based Smart Hydrogel Wound Dressing with Endogenous and Exogenous Dual Adhesion Dynamic Response to Promote Wound Healing

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ADVANCED FUNCTIONAL MATERIALS 2025年

作者： Li, Shuangying Li, Ren Zhang, Xiuwen Zhu, Yueyuan Wang, Dong Cui, Wenpeng Chai, Hechen Hou, Yushun Li, Shaoxiang Qingdao Univ Sci & Technol Coll Environm & Safety Engn Qingdao 266042 Peoples R China Qingdao Univ Sci & Technol Shandong Engn Res Ctr Marine Environm Corros & Saf Qingdao 266042 Peoples R China Qingdao Univ Sci & Technol Shandong Engn Technol Res Ctr Adv Coating Qingdao 266042 Peoples R China

Herein, MIL-88b-NH2 nanocage is designed with adenine inside the cage and tannins as gating outside the cage. Based on this core-shell structure, polyvinyl alcohol/carboxymethyl chitosan/MIL/adenine/tannic acid (PCMAT) hydrogels are able to respond endogenously and exogenously at different stages of wound healing. The engineered hydrogel is designed to have tunable adhesion and intelligence. The optimal PCMAT-0.3 hydrogel reduced the pore size to approximate to 13.5 mu m under endogenous response conditions, and the antimicrobial performance reached more than 80% within 6 h. Tensile strength and strain at break are reduced by 8.47% and 60.52% respectively under exogenous response conditions. Evaluation of the healing effect on mouse back wound tissue shows that the wound healing rate is significantly better than the control group without nanocage incorporation on day 14. It provides an idea for the development of smart response hydrogel wound dressing that integrates multifunctionality.

关键词： core-shell structure dual-responsive metal-organic frameworks smart hydrogel tunable adhesion

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Micro-nano fibers with core-shell structure for enhancing flame retardancy and high-temperature resistance of biodegradable triboelectric materials

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NANO ENERGY 2025年 138卷

作者： He, Juanxia Ruan, Xingzhe Yang, Lihong Liu, Zechun Liao, Kezhang Xie, Xuecai Shu, Xueming Zhan, Yongzhong Pang, Xingzhi Yang, Wenchao Zhang, Hanbing Duan, Qingshan Guangxi Univ Sch Resources Environm & Mat Nanning 530004 Peoples R China State Key Lab Featured Met Mat & Lifecycle Safety Nanning 530004 Peoples R China China Univ Geosci Beijing Sch Engn & Technol Beijing 100083 Peoples R China Tsinghua Univ Sch Safety Sci Beijing 100084 Peoples R China Guangxi Univ Sch Light Ind & Food Engn Nanning 530004 Peoples R China

With the development of intelligence and green concepts, triboelectric nanogenerators (TENGs) have gained tremendous attention in wearable devices due to their high sustainability, light weight, and excellent flexibility. However, they may be damaged in high-temperature fires. It is vital to develop a kind of triboelectric material with flame retardance, biodegradability, and high triboelectric properties for the high-temperature alarm and motion monitoring. Herein, a degradable triboelectric material (P/C3P20) with core (polylactic acid/carboxylated multiwalled carbon nanotubes, PLA/C-MWCNT) and shell (polylactic acid/calcium phytate, PLA/PA-Ca) was constructed by coaxial electrospinning. P/C3P20 exhibited burning without molten droplets and self- extinguishing within 6 s, which was due to gas and condensed phases synergistic effects of PO center dot radicals and the dense char layer. Meanwhile, the P/C3P20 membrane degraded up to 70 % on the 4th day in the proteinase K solution. The open-circuit voltage of the P/C3P20-TENG (4 cm2, 76.21 V) was nearly 6.1 times that of the casting PLA-TENG. It maintained 71.29 % at 160 degrees C and 13.40 % at a 520 degrees C flame with burning 20 s, respectively, and successfully outputted stable signals to self-powered sensing. This work provides a novel idea to prepare triboelectric materials and devices with flame retardance, high-temperature resistance, and degradation, which will benefit for early-warning fire and guaranteeing firefights' safety.

关键词： Degradable triboelectric materials Self-powered sensing core-shell structure Flame retardance High-temperature resistance

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The Design of Ternary Nanofibers with core-shell structure for Electromagnetic Stealthy Antenna

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ADVANCED FIBER MATERIALS 2025年第2期7卷 469-480页

作者： Meng, Xiangwei Yu, Meijie Wang, Chengguo Shandong Univ Carbon Fiber Engn Res Ctr Sch Mat Sci & Engn Jinan 250061 Peoples R China Shandong Univ Key Lab Liquid Solid Struct Evolut & Proc Mat State Key Lab Crystal Mat Minist Educ Jinan 250061 Peoples R China

The exploitation of antennas with both electromagnetic stealth and efficient power transmission is of great significance in the information age. Therefore, from the perspective of multi-component composite and microtopography engineering, Ni/C@ZrO2 ternary nanofibers are synthesized through electrospinning and subsequent carbonization. Profiting from the reasonable selection of components and exquisite micro-structure, the synergistic effect is fully developed, with the simultaneous achievement of perfect impedance matching and superior attenuation capacity. Precisely speaking, compared with carbon nanofibers and binary nanofibers, Ni/C@ZrO2 exhibits the minimum reflection loss values of - 60.1 dB at 11.0 GHz, an ultrawide bandwidth up to 7.6 GHz at 3.3 mm, and radar cross-section values less than - 20 dBm2 at most observation angles. A patch antenna with Ni/C@ZrO2 acted as dielectric substrate is designed and displays efficient transmission efficiency, which means the theoretical feasibility of research on stealthy information transmission equipment, and enhances the competitiveness in comparison with other absorbent candidates. Hence, this study successfully prepares a high-performance electromagnetic wave absorbent, and sheds light on the future development of fibrous functional materials.

关键词： Electromagnetic wave absorption Ternary nanofibers core-shell structure Synergistic effect Patch antenna

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Review of core-shell structure zeolite-based catalysts for NO_(x)emission control

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Journal of Environmental Sciences 2025年第4期150卷 451-465页

作者： Lingfeng Jia Jixing Liu Huifang Cheng Zhen Zhao Jian Liu State Key Laboratory of Heavy Oil Processing China University of Petroleum-BeijingBeijing 102249China School of Chemistry and Chemical Engineering Institution for Energy ResearchJiangsu UniversityZhenjiang 212013China Laboratory of Heavy Oil at Karamay China University of Petroleum-Beijing at KaramayKaramay 834000China

Nitrogen oxides(NO_(x))from diesel engine exhaust,is one of the major sources of environmental ***,selective catalytic reduction with ammonia(NH_(3)-SCR)is considered to be the most effective protocol for reducing NO_(x)***,zeolitebased NH_(3)-SCR catalysts have been industrialized and widespread used in this ***,with the increasingly stringent environmental regulations and implementation of the requirement of“zero emission”of diesel engine exhaust,it is extremely urgent to prepare catalysts with superior NH_(3)-SCR activity and exceptional resistance to poisons(SO2,alkali metals,hydrocarbons,etc.).core-shell structure zeolite-based catalysts(CSCs)have shown great promise in NH_(3)-SCR of NO_(x)in recent years by virtue of its relatively higher low-temperature activity,broader operation temperature window and outstanding resistance to *** review mainly focuses on the recent progress of CSCs for NH_(3)-SCR of NO_(x)with three extensively investigated SSZ-13,ZSM-5,Beta zeolites as *** reaction mechanisms of resistance to sulfur poisoning,alkali metal poisoning,hydrocarbon poisoning,and hydrothermal aging are ***,the important role of interfacial effect between core and shell in the reaction of NH_(3)-SCR was ***,the future development and application outlook of CSCs are prospected.

关键词： NH_(3)-SCR Zeolite core-shell structure Resistance Interfacial effects

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Study on preparing the latexes composed of polyvinyl chloride-acrylate copolymers with core-shell structure for increasing water resistance of its coating

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PROGRESS IN ORGANIC COATINGS 2025年 200卷

作者： Wu, Yu Qi, Xinhui Zhang, Yue Wang, Shufen Ding, Yunsheng Hefei Univ Technol Sch Mat Sci & Engn Hefei 230009 Anhui Peoples R China Hefei Univ Adv Funct Coating Addit R&D Ctr Sch Energy Mat & Chem Engn Hefei 230601 Anhui Peoples R China Hefei Univ Technol Sch Chem & Chem Engn Hefei 230009 Anhui Peoples R China Anhui Prov Key Lab Adv Funct Mat & Devices Hefei 230009 Anhui Peoples R China

The insufficient water resistance of waterborne coatings is an important factor limiting their applications. Herein, the latexes composed of polyvinyl chloride-acrylate copolymer (PVC-ACM) with a core-shell structure have been synthesized via seeded emulsion polymerization, and coupling agents were introduced into the polymerization to reinforce the core-shell interfacial bonding and increasing the water resistance of the PVC-ACM coatings. The effects of quantity, types of surfactants, and introducing way of coupling agent into seed emulsion polymerization on the performance of the latex and the water resistance of the PVC-ACM coatings were investigated. The results determined that latex particles composed of PVC-ACM copolymers exhibit a core-shell structure when the PVC content reaches 40 wt%, and the comprehensive performance of the latex reaches its optimum when a combined surfactant system consists of 2.5 wt% SR-10/CO-436 while the introduction amount of coupling agent KH570 is 2 wt%. Moreover, the water contact angle of coatings consisting of PVC-ACM latex reached 92.3 degrees, and the 24-h water absorption rate decreased to 2.4 %. This study presented a promising approach for developing the new waterborne coatings with superior water resistance.

关键词： Waterborne coatings Water resistance Polyvinyl chloride Acrylate core-shell structure

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Microstructure and High-Temperature Compressive Properties of a core-shell structure Dual-MAX-Phases-Reinforced TiAl Matrix Composite

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CRYSTALS 2025年第4期15卷 363-363页

作者： Liu, Shiqiu Guo, Huijun Hangzhou City Univ Adv Mat Addit Mfg Innovat Res Ctr Sch Engn Hangzhou 310015 Peoples R China

As an advanced high-temperature structural material, TiAl alloy, is often used in the manufacturing of hot-end components of aviation and aerospace engines. However, it is difficult to increase the strength at high temperature, which limits its wider application. Adopting composite material technology is one of the effective ways to improve the comprehensive mechanical properties of TiAl alloy. In this work, by adding 3 wt.% SiC micro-particles to Ti-47.5Al-7Nb-0.4W-0.1B (at.%) pre-alloyed powder, a core-shell structure dual-MAX-phase high-temperature strengthened TiAl matrix composite (also known as TiAl-SiC composite) was prepared by combining powder metallurgy and hot forging. The microstructure and high-temperature compressive properties of the prepared TiAl-SiC composites were studied and compared with TiAl alloy prepared by the same process, and the microstructural characteristics of the TiAl-SiC composite and its microstructure evolution during processing were revealed. The results show that the matrix of as-sintered TiAl-SiC composites was mainly composed of gamma phase and a small amount of Ti2AlC particles, while the reinforcement phase was a dual-MAX-phase core-shell structure, which was mainly composed of core Ti2AlC phase, shell Ti3SiC2 phase, and small Ti2AlC particles distributed in the outer layer. After hot forging, the microstructure of TiAl-SiC composite became more compact, finer, and more uniform;the phase composition was almost not changed, but the content of Ti2AlC, Ti3SiC2, and TiB2 phases increased significantly;the content of C in each constituent phase decreased obviously, and a granular Si-rich phase was generated in the core of the reinforcement phase. The yield strength of the as-forged TiAl-SiC composite was significantly higher than that of the as-forged TiAl alloy at temperature higher than 859 degrees C. This is because the core-shell structure dual MAX phases can effectively reduce the softening rate of TiAl alloy in the range of 8

关键词： TiAl matrix composite MAX phase hot forging core-shell structure high-temperature compressive properties

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Bimetallic synergy in core-shell structure boosts low-temperature NH3-SCR performance and SO2 resistance

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CHEMICAL ENGINEERING JOURNAL 2025年 507卷

作者： Zhao, Liming Yang, Yingju Wang, Xin Liu, Jing Huazhong Univ Sci & Technol Sch Energy & Power Engn State Key Lab Coal Combust Wuhan 430074 Peoples R China

The selective catalytic reduction (SCR) technology, as an effective method for the reduction of nitrogen oxides (NOx), has been demonstrated considerable potential for widespread application. The design and development of low-temperature SCR catalysts with excellent SO2 resistance remain a great challenge. Herein, a strategy to enhance the low-temperature SCR activity and anti-poisoning ability to SO2 was proposed through boosting the metal-metal interaction in the core-shell structure. SiO2@CoMn2O4 core-shell catalyst showed a NO conversion of >90 % and better sulfur resistance at lower temperature of 120 degrees C, which was ascribed to the oxygen species migration and charge transfer induced by the bimetallic synergy of core-shell structure. SiO2 core not only introduced abundant surface hydroxyl groups to inhibit the direct interaction between the active site and SO2, but also provided fruitful surface acid sites to promote the reactant adsorption. Both in situ DRIFTS analysis, steady-state kinetics and DFT calculations indicated that the Eley-Rideal mechanism is dominant to the NH3-SCR process of SiO2@CoMn2O4 catalystNH3 activation over CoMn2O4 displayed the lowest energy barrier (0.69 eV) because of the bimetallic synergy. This study provides important theoretical foundation for the design of catalysts with excellent SCR performance and SO2 resistance.

关键词： NH3-SCR core-shell structure Density functional theory SO2 resistance SiO2@CoMn2O4

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A Novel Application of Fe3O4@MnO2/NC Bimetallic Oxide Catalyst with core-shell structure toward Oxygen Reduction Reaction

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RUSSIAN JOURNAL OF PHYSICAL CHEMISTRY A 2025年第3期99卷 453-461页

作者： Zhang, Aiai Li, Chunli Liu, Zheng Yuan, Shisi Chen, Yang Wang, Qiong Zhang, Fengzhen Sichuan Univ Sci & Engn Sch Chem Engn Zigong 643000 Peoples R China

The energy crisis and environmental pollution have made the development of highly efficient oxygen reduction reaction (ORR) electrocatalysts a research priority to improve fuel cell performance. A simple one-pot hydrothermal method was successfully used to synthesize the Fe3O4@MnO2/NC composite material, and the performance of catalyst was enhanced by adjusting the molar ratio of Fe-Mn and the addition of coconut shell carbon (CSC). The characterization results show that the Fe3O4@MnO2/NC with core-shell structure has a high specific surface area (751 m(2) g(-1)) and provides abundant active sites for ORR. The electrochemical test results show that Fe3O4@MnO2/NC exhibits a superior ORR activity among the as-prepared catalysts due to strong interfacial coupling interaction. In addition, it also has a high specific capacitance, a small Tafel slope, and the lowest impedance in ORR. This not only verifies its excellent performance, but also provides a new approach and idea for developing non-precious metal ORR catalysts.

关键词： oxygen reduction reaction hydrothermal method Fe3O4@MnO2/NC core-shell structure

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Effect of core-shell structure of MgAl-CuO nanothermite coated with potassium perchlorate on the thermo-kinetic behavior of NC/DEGDN composite

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JOURNAL OF ENERGETIC MATERIALS 2025年第2期43卷 329-347页

作者： Dourari, Mohammed Tarchoun, Ahmed Fouzi Trache, Djalal Abdelaziz, Amir Tiliouine, Roufaida Barkat, Tessnim Bessa, Wissam Bekhouche, Slimane Ecole Mil Polytech Teaching & Res Unit Energet Proc Energet Mat Lab Bordj El Bahri Algeria Ecole Mil Polytech Teaching & Res Unit Energet Proc Energet Prop Lab Bordj El Bahri Algeria Ecole Super Mat ESM Energet Mat Lab Bordj El Bahri Algeria Inst Rech & Dev Ind & Technol Def Energet Mat Lab Bordj El Bahri Algeria Ecole Mil Polytech Energet Mat Lab Teaching & Res Unit Energet Proc BP 17 Bordj El Bahri Algeria

In this study, a core-shell structure of MgAl-CuO nanothermite coated with ammonium perchlorate (KClO4@MgAl-CuO) has been successfully prepared by a solvent/non-solvent synthetic method, and its catalytic influence on the thermo-kinetic behavior of nitrated cellulose (NC)/diethylene glycol dinitrate (DEGDN) composite has been studied using differential scanning calorimetry (DSC) combined with three isoconversional kinetic models. Beforehand, scanning electron microscopy (SEM) and Fourier-transform infrared spectroscopy (FTIR) findings showed that the prepared KClO4@MgAl-CuO particles were uniformly distributed within the NC/DEGDN matrix. Moreover, the obtained DSC thermograms indicated that the thermolysis of the developed NC/DEGDN composite was shifted to a lower temperature after the incorporation of the coated nanothermite. Additionally, a significant decrease in the activation energy (from approximately 136 to 94 kJ/mol) was also observed, demonstrating that the presence of the KClO4@MgAl-CuO nanothermite catalyzed the decomposition of NC/DEGDN propellant. Therefore, this study could serve as a reference for future research on the coated metastable intermolecular composites and their effects on double-base propellants.

关键词： core-shell structure diethylene glycol dinitrate nanothermite nitrated cellulose thermal kinetics

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