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Ag anchored mesoporous carbon hollow sphere in Cellulose nanofibers/MXene composite films for high-performance electromagnetic interference shielding

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Nano Materials Science 2025年第1期7卷 65-73页

作者： Wenting Tao Wenqin Shao Meng Ma Si Chen Yanqin Shi Huiwen He Yulu Zhu Xu Wang College of Materials Science and Engineering Zhejiang Key Laboratory of Plastic Modification and Processing TechnologyZhejiang University of TechnologyHangzhou310014PR China State Key Laboratory of Polymer Materials Engineering Sichuan UniversityChengdu610065PR China

The increasingly serious electromagnetic(EM)radiation and related pollution effects have gradually attracted people's attention in the information ***,it's crucial to develop adaptive shielding materials with minimum EM waves(EMW)*** this paper,Ag nanoparticles loaded mesoporous carbon hollow spheres(MCHS@Ag)were synthesized by chemical reduction method,and cellulose nanofibers(CNF)/MXene/MCHS@Ag homogeneous composites were *** total EM interference shielding efficiency(SET)of CNF/MXene/MCHS@Ag composite film was 32.83 dB(at 12.4 GHz),and the absorption effectiveness(SEA)was improved to 26.6 dB,which was 63.1%and 195.5%higher than that of CNF/MXene/MCHS composite *** low dielectric property of MCHS effectively optimized the impedance matching between the composites and *** hollow porous structure prolonged the transmission path of EMW and increased the absorption loss of the *** the same time,Ag nanoparticles located the MCHS were helpful to construct the internal conductive path overcoming the damage of the conductive property caused by the low dielectric of *** research adopts a straightforward method to construct a lightweight,pliable,and mesoporous composites for EMI shielding,which serves a crucial role in the current era of severe EM pollution.

关键词： EMI shielding Porous structure Low reflection Film Ag anchored

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CO_(2)-Sourced Poly(chloropropylene carbonate) with High Flame-Retardant Performance

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Chinese Journal of Polymer Science 2025年第1期43卷 110-119,I0010页

作者： Yue Gong Xiao-Feng Zhu Guan-Wen Yang Meng Ma Xu Wang Jie Xu Xin Shu Guang-Peng Wu MOE Key Laboratory of Macromolecular Synthesis and Functionalization Key Laboratory of Adsorption and Separation Materials&Technologies of Zhejiang ProvinceDepartment of Polymer Science and EngineeringZhejiang UniversityHangzhou 310058China Zhejiang Key Laboratory of Plastic Modification and Processing Technology College of Materials Science and EngineeringZhejiang University of Technology Hangzhou 310014China Shanxi Coal Chemical Industry Technology Research Institute Co Ltd.Xi'an 710100China

The alternating copolymer of CO_(2) with epoxide is a green plastic that can efficiently transform CO_(2) into valuable chemicals. Despite the significant advances made, the restricted practical application of CO_(2)-sourced polycarbonates due to their lack of functionality has hindered field development. We successfully demonstrated the flame retardancy of poly(chloropropylene carbonate) (PCPC), a perfectly alternating copolymer of epichlorohydrin (ECH) and CO_(2). This was prepared at a 200-gram scale using a high-efficacy tetranuclear organoborane catalyst. PCPC’s excellent flame-retardant performance has been proven by both the vertical combustion test (UL94 V-0) and the limiting oxygen index (LOI) value (29.1%). The underlaid flame-retardant mechanism of PCPC was clearly elucidated. As a result, we confirmed that the generated cyclic carbonates and concurrently released flame-retardant chlorine radicals, hydrogen chloride, and CO_(2) during combustion render PCPC an excellent flame retardant. Furthermore, we investigated the practicability of PCPC as a halogen-rich polymeric flame retardant by blending it with commercial bisphenol A polycarbonate (BPA-PC). PCPC upgraded the flame retardancy rating of BPA polycarbonate from V-2 to V-0 even with a mere 1 wt% addition. It is our hope that this result will prove useful in future developments of advanced CO_(2)-sourced polymeric materials.

关键词： Carbon dioxide Ring-Opening polymerization Organocatalysis Sustainable materials Flame-retardant polymer

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Macrophage response to fibrin structure mediated by Tgm2-dependent mitochondrial mechanosensing

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Bioactive Materials 2025年 50卷 382-395页

作者： Gao, Bicong Ni, Haifeng Lai, Junhong Gao, Ning Luo, Xinxin Wang, Ying Chen, Yani Zhao, Jiaying Yu, Zhou Zhang, Jing Cai, Wenjin Yang, Guoli Stomatology Hospital School of Stomatology Zhejiang University School of Medicine Zhejiang Provincial Clinical Research Center for Oral Diseases Key Laboratory of Oral Biomedical Research of Zhejiang Province Cancer Center of Zhejiang University Engineering Research Center of Oral Biomaterials and Devices of Zhejiang Province Hangzhou 310000 China Zhejiang Key Laboratory of Plastic Modification and Processing Technology College of Materials Science & Engineering Zhejiang University of Technology Hangzhou 310014 China

Following an injury at the implantation position, blood-material interactions form a fibrin architecture, which serves as the initial activator of foreign body response (FBR). However, there is limited knowledge regarding how the topography of fibrin architectures regulates macrophage behavior in mitigating FBR. Mechanical cues of the microenvironment have been reported to shape immune cell functions. Here, we investigated macrophage mechanobiology at the organelle level by constructing heterogeneous fibrin networks. Based on findings in vivo, we demonstrated that adhesion-mediated differentiation of mitochondrial function modulated macrophage polarization. The finite activation of integrin signaling upregulated transglutaminase 2 (Tgm2) in a trans-manner, augments PGC1α-mediated mitochondrial biogenesis. Our study highlighted the previously overlooked spatial structures of host proteins adsorbed on material surfaces, advocating for a paradigm shift in material design strategies, from focusing solely on physical properties to considering the modification of host proteins. © 2025 The Authors

关键词： Biomaterial recognition Foreign body response Mechanotransduction Mitochondrion Transglutaminase

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"Brick-mud" porous impregnated-segregated polymer composites with excellent electrical insulation, high thermal conductivity, and good electromagnetic interference shielding

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Polymer 2025年 316卷

作者： Guo, Hongxin Feng, Huiyao Liu, Tong Kuang, Tairong Lab Zhejiang Key Laboratory of Plastic Modification and Processing Technology College of Materials Science and Engineering Zhejiang University of Technology Hangzhou310014 China

The advancement of 5G communication systems and modern electronic devices has driven the demand for advanced polymer composites with multifunctional capabilities, including electromagnetic interference (EMI) shielding, thermal conductivity, electrical insulation, and mechanical robustness. However, achieving an optimal combination of these properties in a single polymeric material remains challenging. Here, a novel "brick-mud" porous impregnated-segregated structure was developed to address these challenges. This structure consists of polylactic acid/multi-wall carbon nanotubes (PLA/CNTs) microspheres as the "brick" phase and polybutylene succinate/boron nitride (PBS/BN) as the "mud" phase. The interconnected porous PLA/CNTs microspheres were prepared via an emulsion method, which allowed effective infiltration by the PBS/BN matrix during melt blending, resulting in a robust interface. The ratio of "mud" to "brick" was systematically varied, facilitating regulation of the balance between the different multifunctional properties. The resulting composites demonstrated excellent performance, with EMI shielding effectiveness up to ∼41.1 dB, thermal conductivity up to ∼1.37 W m⁻1 K⁻1, volume resistivity exceeding 101⁵ Ω·cm, and mechanical strength as high as ∼54.2 MPa, depending on the composition. Such performance characteristics make these composites particularly suitable for use as casings for 5G communication equipment, where efficient thermal management, EMI shielding, and structural durability are critical. © 2024 Elsevier Ltd

关键词： Electromagnetic shielding

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P/N Zinc salt containing biological groups for synchronously enhanced the fire safety, anti-dripping and mechanical properties of polylactic acid

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International Journal of Biological Macromolecules 2025年第Pt 4期311卷 144134页

作者： Zhang, Ning Teng, Yefang Zhao, Dong Liu, Zongsheng Xu, Jian Ma, Meng School of Material Science and Engineering Changzhou Vocational Institute of Industry Technology Changzhou China College of Materials Science and Engineering Zhejiang Key Laboratory of Plastic Modification and Processing Technology Zhejiang University of Technology Hangzhou China

As a promising biodegradable alternative to petroleum-based plastics, Polylactic acid (PLA) faces significant challenges in industrial applications due to its inherent flammability and brittleness, necessitating material modifications for expanded utilization. This study addresses the critical challenges of flammability and brittleness in PLA through the development of a novel bio-based anti-dripping flame retardant system. A phosphorus‑nitrogen containing flame retardant (AAPZ), was successfully synthesized and incorporated with ammonium polyphosphate (APP) to create high-performance PLA composites. The optimized PLA/4.5APP/4.5AAPZ composite demonstrated exceptional flame retardancy, passing a UL-94 V-0 rating with complete suppression of melt dripping. Cone calorimetry analysis revealed significant improvements in fire safety, with peak heat release rate (PHRR) and total smoke release (TSR) reduced by 60.2 % and 28.3 %, respectively, compared to neat PLA. Remarkably, the composite maintained excellent mechanical properties, exhibiting a 185 % increase in elongation at break while preserving tensile strength. The synergistic flame-retardant mechanism was systematically investigated, demonstrating effective gas-phase and condensed-phase actions. This bio-based flame-retardant system not only overcomes the inherent limitations of PLA but also provides a sustainable solution for expanding its applications in demanding sectors. © 2025 Elsevier B.V.

关键词： Tensile strength

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Fabrication of Cf/SiC composites by direct selective laser sintering and liquid silicon infiltration

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Materials Today Communications 2025年 46卷

作者： Wan, Changjie Geng, Yanfei Chen, Xizhang Zhang, Shuai Lin, Xiao Lin, Dingan Xue, Wei Fang, Tiehui Lang, Wenchang Zhejiang Provincial Key Laboratory of Laser Processing Robotics College of Mechanical and Electrical Engineering Wenzhou University China China International Science & Technology Cooperation Base for Laser Processing Robotics Wenzhou University China YUSHI Film Technology Co. Ltd. Jiangsu Huaian China Zhejiang Wenzhou China Key Laboratory of Surface Modification School of Intelligent Manufacturing Wenzhou Polytechnic Wenzhou325035 China

Selective Laser Sintering (SLS) technology has demonstrated significant potential in the production of high-precision, complex Cf/SiC ceramic matrix composites. However, traditional additive manufacturing methods typically require the incorporation of binders, such as resins, into the raw powders. These processes are often complex, and the removal of binders during debinding can lead to volumetric shrinkage, which negatively affects the dimensional accuracy of the final product. To address this, a novel approach based on SLS technology for manufacturing Cf/SiC composites has been developed. By directly laser sintering a mixture of carbon fiber and silicon carbide powders, Cf/SiC ceramic preforms were successfully fabricated. These preforms were then infiltrated with liquid silicon (LSI) to produce Cf/SiC ceramic composites. Experimental results indicate that the addition of carbon fiber significantly enhanced the physical properties of the preforms, which in turn influenced the microstructure and mechanical properties of the final Cf/SiC composites. The maximum density, flexural strength, and fracture toughness of the fabricated Cf/SiC composites were 2.620 ± 0.127 g/cm³, 143.59 ± 6.51 MPa, and 3.43 ± 0.20 MPa·m1/2, respectively, demonstrating the feasibility of this method for producing near-net-shape Cf/SiC ceramic matrix composite parts with complex structures. © 2025 Elsevier Ltd

关键词： Fracture toughness

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Magnetic-conductive bi-gradient structure design of CP/PGFF/Fe 3 O 4 composites for highly absorb e d EMI shielding and balanced mechanical strength

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Journal of Materials Science & technology 2023年第2期133卷 102-110页

作者： Qiang Peng Meng Ma Si Chen Yanqin Shi Huiwen He Xu Wang College of Materials Science and Engineering Zhejiang University of TechnologyHangzhou 310014China Key Laboratory of Plastic Modification and Processing Technology in Zhejiang Province Hangzhou 310014China

Developing excellent absorption-dominant electromagnetic interference(EMI)shielding composites is an urgent demand for the rapid development of 5 G technology and electronic ***,a simple strategy is employed to fabricate carbon nanotubes-polypropylene fibers(CP)/polypropylene-glass fibers felt(PGFF)/Fe 3 O 4 composites with superior EMI shielding effectiveness and low reflection due to the magnetic-conductive bi-gradient structure which is naturally formed by deposition during the vacuum-assisted filtration *** difference in dimensionality between one-dimensional CNT with outstand-ing electrical conductivity and zero-dimensional magnetic Fe 3 O 4 nanoparticles is the theoretical basis for the successful construction of the magnetic-conductive bi-gradient structure in a gap-rich PGFF matrix that endows the composites with“absorb-reflect-reabsorb”EMI ***-magnetic waves are incident from the magnetic layer,the EMI shielding effectiveness(SE)reaches 48.9 dB as the weight percentage of the conductive layer increases,more importantly,the reflection coefficients are reduced by more than 0.32 compared with that of another incident ***’s more,the re-sultant composites exhibit an outstanding signal shielding function in the *** work paves a convenient pathway for designing a magnetic-conductive bi-gradient structure and efficient absorbing EMI shielding composites applied in the next-generated electronic information and communication field.

关键词： Electromagnetic interference shielding Magnetic-conductive bi-gradient structure Absorption-dominant Dimensionality Polypropylene-glass fibers felt

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Catalytic recycling of plastics into value-added products

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Nano Research 2024年第11期17卷 9428-9445页

作者： Tianyu Wei Pengcheng Zhou Wenxian Liu Xijun Liu Tairong Kuang Functional Polymers and Advanced Materials (FPAM) Lab Zhejiang Key Laboratory of Plastic Modification and Processing Technology College of Materials Science and Engineering Zhejiang University of Technology Hangzhou 310014 China State Key Laboratory of Featured Metal Materials and Life-cycle Safety for Composite Structures Guangxi Key Laboratory of Processing for Nonferrous Metals and Featured Materials MOE Key Laboratory of New Processing Technology for Nonferrous Metals and Materials School of Resources Environment and Materials Guangxi University Nanning 530004 China

The overuse and ineffective management of plastics have led to significant environmental pollution. Catalytic upcycling into value-added chemicals has emerged as a promising solution. This review provides a comprehensive overview of recent advances in catalytic upcycling, focusing on the cleavage of chemical bonds such as carbon-carbon (C-C), carbon-oxygen (C-O), and carbon-hydrogen (C-H) in plastics. It systematically discusses plastics conversion via electrocatalysis, thermal catalysis, and photocatalysis. Additionally, it explores the conversion of plastics into value-added chemicals and functional polymers. The review also addresses the challenges in this field and aims to offer insights for developing sustainable and effective plastics upcycling technologies.

关键词： plastics recycling catalysis chemical recycling value-added chemicals functional polymers

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Nano-silver-modified polyphosphazene nanoparticles with different morphologies:Design,synthesis,and evaluation of antibacterial activity

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Chinese Chemical Letters 2023年第12期34卷 433-439页

作者： Tairong Kuang Linbing Deng Sitao Shen Hongxia Deng Zhisen Shen Zhenjie Liu Zhengping Zhao Feng Chen Mingqiang Zhong Zhejiang Key Laboratoryof Plastic Modification and Processing Technology Collegeof Material Science and EngineeringZhejiang University of Technology Hangzhou 310014China Department of Otorhinolaryngology Head and Neck SurgeryThe Afiliated LiHuili HospitalNingbo UniversityNingbo 315040China Department of Vascular Surgery Second Afiliated Hospital of Zhejiang University School of MedicineHangzhou 310009China

Drug-resistant bacteria present a severe threat to public health,emphasizing the importance of developing broad-spectrum antibacterial agents that are free from drug *** silver-based antibacterial agents,nano-silver has been found to exhibit the most promising and comprehensive *** exploration of the antibacterial capacity and morphological changes of silver nanoparticles(AgNPs)could offer a starting point for the development of safe and efficient antibacterial *** this study,three types of nano-silver-modified polyphosphazene(PRV)nanoparticles with different morphologies were synthesized using precipitation *** nanoparticles were characterized using various techniques,including Fourier-transform infrared spectroscopy(FTIR),X-ray diffraction(XRD),scanning electron microscopy(SEM),transmission electron microscopy(TEM),and thermogravimetric analysis(TGA).The antibacterial activity of these nanoparticles against Escherichia coli(***)and Staphylococcus aureus(***)was assessed using minimum inhibitory concentration(MiC)/minimum bactericidal concentration(MBC)tests and inverted fluorescence *** results revealed that the antibacterial activity of silver nanoparticles can vary significantly depending on their immobilized ***@PRV Strawberry-like nanoparticles(NPs)exhibited higher antibacterial activity compared to Ag@PRV Yolk-Shell NPs and Ag@PRV Cable-like nanofibers(NFs).Notably,all three types of synthesized nanoparticles demonstrated a stronger bactericidal effect on Gram-positive bacteria than Gram-negative ***/dead bacterial staining and scanning electron microscopy demonstrated that silver can kill bacteria by altering the permeability of their cell *** findings offer valuable insights for designing and practically applying new silver-based antibacterial agents in the future.

关键词： Nano-silver Polyphosphazene Morphology change Antibacterial activity Antibacterial mechanism

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Continuous cooling process of steel 45 in solid phase transformation under laser heat effect

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Optics & Laser technology 2025年 190卷

作者： Qunli Zhang Qing-an Niu Zhijun Chen Yichen Meng Liang Wang Haopeng Dong Tianqiang Lin Guolong Wu Zhuguo Li Jianhua Yao Institute of Laser Advanced Manufacturing Zhejiang University of Technology Hangzhou 310023 China College of Mechanical Engineering Zhejiang University of Technology Hangzhou 310023 China Zhejiang Provincial Innovation Center of Laser Intelligent Equipment Technology Wenzhou 325038 China Shanghai Key Laboratory of Materials Laser Processing and Modification School of Materials Science and Engineering Shanghai Jiao Tong University Shanghai 200240 China

Due to the rapid heating process of laser processing, the laser solid phase transformation is a non-equilibrium process with a different continuous cooling transformation (CCT) diagram. For guiding laser processing more accurately, this study delves into the laser solid phase transformation process. In order to clarify the specific mechanism of laser effect during the continuous cooling process at high heating rates, the critical transformation temperatures and incubation time for ferrite, austenite, pearlite, bainite and martensite in steel 45 were determined by thermal expansion tests. A scanning electron microscope (SEM) equipped with electron backscatter diffraction (EBSD) mode was used to identify the transformed microstructure and grain size. The influence of the laser on the CCT diagram was further analyzed. The experimental results show that the incubation period before metal microstructure transformation is accelerated due to the laser effect. In addition, the depth of the laser solid transformation is governed by thermal conduction. In order to obtain a deeper strengthening depth, the peak temperature of the material’s surface is much higher than A C3 (Complete austenitizing temperature).

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