Composites Part B: Engineering最新文献_第7页

Scalable and flexible radiative cooling composite metamaterial structure with thermally responsive emissivity tunability

IF 12.7 1区材料科学 Q1 ENGINEERING, MULTIDISCIPLINARY

Composites Part B: Engineering

Pub Date : 2025-01-31 DOI: 10.1016/j.compositesb.2025.112207

Sudip Kumar Pal, Gunwoo Kim

An ideal thermally adaptive composite metamaterial structure (CMS) requires precise spectral control capabilities to achieve efficient heat emission within the atmospheric transparency window (8–14 μm), scalability, and durability to facilitate effective thermoregulation in response to the ambient temperature. Here, we propose a polyethylene (PE) based composite metamaterial structure (PE-CMS) constructed by randomly distributed vanadium dioxide (VO₂) and indium tin oxide (ITO) particles within the PE matrix, forming a PE based composite metamaterial film (PE-CMF), which is deposited on the aluminium substrate. Utilizing the low infrared (IR) absorption property of PE, the phase transition property of VO₂ and the high IR scattering properties of ITO, we have developed temperature induced PE-CMS. This design enhances the overall IR absorption through the scattering effect of metallic VO₂ particles during the temperature-induced insulator-to-metal phase transition, together with the scattering of ITO particles. This enables the automatic switching of the thermal emittance from approximately 60 %–75 %, upon the metal-to-insulator transition temperature. This study provides a theoretical explanation of the mechanism by which metallic VO₂ functions as an IR absorber by efficiently trapping infrared radiation, leading to an extended optical path length within the polymer matrix. Furthermore, it explores the selection of the most suitable polymer matrix for optimizing emissivity modulation in response to temperature variations. Numerical simulations, along with indoor and outdoor field tests, are utilize to explore the adaptive thermal emission mechanisms underlying the proposed PE-CMS. The structure can be a promising structure for utilizing as a dynamic in various applications for adaptive thermal regulation.

{"title":"Scalable and flexible radiative cooling composite metamaterial structure with thermally responsive emissivity tunability","authors":"Sudip Kumar Pal, Gunwoo Kim","doi":"10.1016/j.compositesb.2025.112207","DOIUrl":"10.1016/j.compositesb.2025.112207","url":null,"abstract":"<div><div>An ideal thermally adaptive composite metamaterial structure (CMS) requires precise spectral control capabilities to achieve efficient heat emission within the atmospheric transparency window (8–14 μm), scalability, and durability to facilitate effective thermoregulation in response to the ambient temperature. Here, we propose a polyethylene (PE) based composite metamaterial structure (PE-CMS) constructed by randomly distributed vanadium dioxide (VO<sub>2</sub>) and indium tin oxide (ITO) particles within the PE matrix, forming a PE based composite metamaterial film (PE-CMF), which is deposited on the aluminium substrate. Utilizing the low infrared (IR) absorption property of PE, the phase transition property of VO<sub>2</sub> and the high IR scattering properties of ITO, we have developed temperature induced PE-CMS. This design enhances the overall IR absorption through the scattering effect of metallic VO<sub>2</sub> particles during the temperature-induced insulator-to-metal phase transition, together with the scattering of ITO particles. This enables the automatic switching of the thermal emittance from approximately 60 %–75 %, upon the metal-to-insulator transition temperature. This study provides a theoretical explanation of the mechanism by which metallic VO<sub>2</sub> functions as an IR absorber by efficiently trapping infrared radiation, leading to an extended optical path length within the polymer matrix. Furthermore, it explores the selection of the most suitable polymer matrix for optimizing emissivity modulation in response to temperature variations. Numerical simulations, along with indoor and outdoor field tests, are utilize to explore the adaptive thermal emission mechanisms underlying the proposed PE-CMS. The structure can be a promising structure for utilizing as a dynamic in various applications for adaptive thermal regulation.</div></div>","PeriodicalId":10660,"journal":{"name":"Composites Part B: Engineering","volume":"295 ","pages":"Article 112207"},"PeriodicalIF":12.7,"publicationDate":"2025-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143318617","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Enhanced flame retardancy and electrical conductivity in nacre-inspired PBAT/montmorillonite/lignin ternary biodegradable composites reinforced with well-dispersed carbon nanotubes

IF 12.7 1区材料科学 Q1 ENGINEERING, MULTIDISCIPLINARY

Composites Part B: Engineering

Pub Date : 2025-01-31 DOI: 10.1016/j.compositesb.2025.112214

Si-Jie Zhou , Shao-Jun Xiong , Shixin Yu , Tong-Qi Yuan

Poly(butylene adipate-co-terephthalate) (PBAT) has shown great promise as a biodegradable plastic for packaging film production. However, its inherent flammability and tendency to produce molten droplets during combustion pose significant fire risks and safety concerns. This study focuses on developing a PBAT composite designed to enhance safety by addressing these flammability issues. The composite incorporates montmorillonite (MMT) and lignin as fillers, drawing inspiration from the "brick-mortar" structure observed in natural nacres. Organically modified MMT acts as the primary "brick" component, while coupling agent-modified lignin entangled with PBAT serves as the "mortar," effectively binding and anchoring the inorganic layers together. This unique structural configuration improves interfacial compatibility by abundant intermolecular forces and reinforces the nanosheets, resulting in superior mechanical properties. Furthermore, the composite demonstrated significant flame retardancy. It formed a protective carbon layer during combustion that blocks oxygen access, inhibited the release of combustible volatiles, and prevented molten droplet formation, thereby reducing fire hazards. The addition of carbon nanotubes (CNTs) further boosted the mechanical strength of the composites and provided electrical conductivity. Remarkably, the electrical conductivity of these composites increased with ambient temperature, suggesting that the CNTs established robust interfacial connections and created effective conductive pathways. This feature enabled the composites to exhibit pronounced resistance changes and enhanced responsiveness to temperature variations. In conclusion, this study introduces a novel approach for preparing flame-retardant PBAT composites, incorporating intelligent detection capabilities and fire protection attributes. These composites hold potential for application in large-scale packaging materials, offering both safety and functional advancements.

{"title":"Enhanced flame retardancy and electrical conductivity in nacre-inspired PBAT/montmorillonite/lignin ternary biodegradable composites reinforced with well-dispersed carbon nanotubes","authors":"Si-Jie Zhou , Shao-Jun Xiong , Shixin Yu , Tong-Qi Yuan","doi":"10.1016/j.compositesb.2025.112214","DOIUrl":"10.1016/j.compositesb.2025.112214","url":null,"abstract":"<div><div>Poly(butylene adipate-co-terephthalate) (PBAT) has shown great promise as a biodegradable plastic for packaging film production. However, its inherent flammability and tendency to produce molten droplets during combustion pose significant fire risks and safety concerns. This study focuses on developing a PBAT composite designed to enhance safety by addressing these flammability issues. The composite incorporates montmorillonite (MMT) and lignin as fillers, drawing inspiration from the \"brick-mortar\" structure observed in natural nacres. Organically modified MMT acts as the primary \"brick\" component, while coupling agent-modified lignin entangled with PBAT serves as the \"mortar,\" effectively binding and anchoring the inorganic layers together. This unique structural configuration improves interfacial compatibility by abundant intermolecular forces and reinforces the nanosheets, resulting in superior mechanical properties. Furthermore, the composite demonstrated significant flame retardancy. It formed a protective carbon layer during combustion that blocks oxygen access, inhibited the release of combustible volatiles, and prevented molten droplet formation, thereby reducing fire hazards. The addition of carbon nanotubes (CNTs) further boosted the mechanical strength of the composites and provided electrical conductivity. Remarkably, the electrical conductivity of these composites increased with ambient temperature, suggesting that the CNTs established robust interfacial connections and created effective conductive pathways. This feature enabled the composites to exhibit pronounced resistance changes and enhanced responsiveness to temperature variations. In conclusion, this study introduces a novel approach for preparing flame-retardant PBAT composites, incorporating intelligent detection capabilities and fire protection attributes. These composites hold potential for application in large-scale packaging materials, offering both safety and functional advancements.</div></div>","PeriodicalId":10660,"journal":{"name":"Composites Part B: Engineering","volume":"295 ","pages":"Article 112214"},"PeriodicalIF":12.7,"publicationDate":"2025-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143318657","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Spatial strain distribution and in-situ damage analysis of sheet moulding compounds based on digital volume correlation

IF 12.7 1区材料科学 Q1 ENGINEERING, MULTIDISCIPLINARY

Composites Part B: Engineering

Pub Date : 2025-01-31 DOI: 10.1016/j.compositesb.2025.112220

Yi Wan , Salaheddine E. Madi , Kamel Madi , Jeroen Soete , Jun Takahashi , Stepan V. Lomov , Yentl Swolfs

Carbon fibre-reinforced thermoplastics sheet moulding compounds demonstrate significant potential for cost-effective, mass production applications in lightweight structures. However, the material's complex internal morphology poses substantial challenges for mechanical property prediction. To elucidate the failure mechanisms of sheet moulding compounds, in-situ tensile X-ray computed tomography experiments were conducted in conjunction with digital volume correlation analysis, marking the first application of this method to sheet moulding compounds. Detailed correlations between strain distribution, pore density, strand orientation, and microcrack formation were clarified. A strong correlation was identified between microcrack initiation and areas of high pore density. Strain concentrations were predominantly observed in regions with overlapping strands and high pore density, factors which contribute to accelerated microcrack propagation. These observations reveal that minimising internal morphological irregularities and enhancing interface properties can reduce microcrack propagation, thereby improving the mechanical performance of sheet moulding compounds.

{"title":"Spatial strain distribution and in-situ damage analysis of sheet moulding compounds based on digital volume correlation","authors":"Yi Wan , Salaheddine E. Madi , Kamel Madi , Jeroen Soete , Jun Takahashi , Stepan V. Lomov , Yentl Swolfs","doi":"10.1016/j.compositesb.2025.112220","DOIUrl":"10.1016/j.compositesb.2025.112220","url":null,"abstract":"<div><div>Carbon fibre-reinforced thermoplastics sheet moulding compounds demonstrate significant potential for cost-effective, mass production applications in lightweight structures. However, the material's complex internal morphology poses substantial challenges for mechanical property prediction. To elucidate the failure mechanisms of sheet moulding compounds, in-situ tensile X-ray computed tomography experiments were conducted in conjunction with digital volume correlation analysis, marking the first application of this method to sheet moulding compounds. Detailed correlations between strain distribution, pore density, strand orientation, and microcrack formation were clarified. A strong correlation was identified between microcrack initiation and areas of high pore density. Strain concentrations were predominantly observed in regions with overlapping strands and high pore density, factors which contribute to accelerated microcrack propagation. These observations reveal that minimising internal morphological irregularities and enhancing interface properties can reduce microcrack propagation, thereby improving the mechanical performance of sheet moulding compounds.</div></div>","PeriodicalId":10660,"journal":{"name":"Composites Part B: Engineering","volume":"295 ","pages":"Article 112220"},"PeriodicalIF":12.7,"publicationDate":"2025-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143318662","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The natural reticular hematoma scaffold modulating inflammatory microenvironment and promoting bone regeneration

IF 12.7 1区材料科学 Q1 ENGINEERING, MULTIDISCIPLINARY

Composites Part B: Engineering

Pub Date : 2025-01-31 DOI: 10.1016/j.compositesb.2025.112199

Lin Wu , Jiawei Liu , Tong Qiu , Honglian Dai

The bone defect causes hematoma, with the degradation of hematoma, the hematoma providing a bridge to the fracture edge and serving as the first scaffold after bone defect. However, there is a paucity of studies exploring the correlation between surface properties of scaffolds and hematoma fibrin network properties as well as immune response. In this study, we manufactured the needle-like crystals calcium magnesium phosphate bone cement (CMPC) by thermodynamic recrystallization. In vitro experiments, the blood cells formed the hematoma on CMPC. With the degradation of hematoma, it showed a fibrin network with the porosity of 70.8±0.03% and the diameter of 0.43±0.02 μm formed on the CMPC surface. Moreover, the degradation of hematoma also promoted the release of growth factors and cell migration. The tibial fracture model and femoral condyle defect model in rats demonstrated that the fibrin networks formed on CMPC after implantation. It promoting bone tissue regeneration by attenuating acute inflammation during the early stage of bone healing, suppressing endoplasmic reticulum stress, and establishing an anti-inflammatory microenvironment.

{"title":"The natural reticular hematoma scaffold modulating inflammatory microenvironment and promoting bone regeneration","authors":"Lin Wu , Jiawei Liu , Tong Qiu , Honglian Dai","doi":"10.1016/j.compositesb.2025.112199","DOIUrl":"10.1016/j.compositesb.2025.112199","url":null,"abstract":"<div><div>The bone defect causes hematoma, with the degradation of hematoma, the hematoma providing a bridge to the fracture edge and serving as the first scaffold after bone defect. However, there is a paucity of studies exploring the correlation between surface properties of scaffolds and hematoma fibrin network properties as well as immune response. In this study, we manufactured the needle-like crystals calcium magnesium phosphate bone cement (CMPC) by thermodynamic recrystallization. In vitro experiments, the blood cells formed the hematoma on CMPC. With the degradation of hematoma, it showed a fibrin network with the porosity of 70.8±0.03% and the diameter of 0.43±0.02 μm formed on the CMPC surface. Moreover, the degradation of hematoma also promoted the release of growth factors and cell migration. The tibial fracture model and femoral condyle defect model in rats demonstrated that the fibrin networks formed on CMPC after implantation. It promoting bone tissue regeneration by attenuating acute inflammation during the early stage of bone healing, suppressing endoplasmic reticulum stress, and establishing an anti-inflammatory microenvironment.</div></div>","PeriodicalId":10660,"journal":{"name":"Composites Part B: Engineering","volume":"295 ","pages":"Article 112199"},"PeriodicalIF":12.7,"publicationDate":"2025-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143097707","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Thermal shock resistance and bonding strength of integrated quasi-EBC-SiCf/SiC composites fabricated by tape casting and reactive melt infiltration

IF 12.7 1区材料科学 Q1 ENGINEERING, MULTIDISCIPLINARY

Composites Part B: Engineering

Pub Date : 2025-01-31 DOI: 10.1016/j.compositesb.2025.112190

Liang Zhou , Jianbao Hu , Wang Yuan , Feiyan Cai , Xiao You , Yanmei Kan , Yan Zhang , Xiangyu Zhang , Jinshan Yang , Xiaowu Chen , Shizhi Wu , Shaoming Dong

To enhance the service life and reliability of SiC_f/SiC composites after EBCs exfoliation, an integrated design concept is proposed to use Si reactive melt infiltration to prepare integrated EBC- SiC_f/SiC composites in this work. It can form a quasi-EBC layer with EBC components on the surface of SiC_f/SiC composites. The integrated structure has stronger bonding strength than the conventional coating and matrix. During thermal shock cycling, its thermal shock resistance can be enhanced by consuming SiO₂ to form Yb₂Si₂O₇ with good damage tolerance. Meanwhile, the presence of quasi-EBC layer is expected to provide secondary protection for SiC_f/SiC composites after conventional EBC stripping, which can improve the service life of SiC_f/SiC composites. This work provides a new idea for the long-life modification of SiC_f/SiC composites.

{"title":"Thermal shock resistance and bonding strength of integrated quasi-EBC-SiCf/SiC composites fabricated by tape casting and reactive melt infiltration","authors":"Liang Zhou , Jianbao Hu , Wang Yuan , Feiyan Cai , Xiao You , Yanmei Kan , Yan Zhang , Xiangyu Zhang , Jinshan Yang , Xiaowu Chen , Shizhi Wu , Shaoming Dong","doi":"10.1016/j.compositesb.2025.112190","DOIUrl":"10.1016/j.compositesb.2025.112190","url":null,"abstract":"<div><div>To enhance the service life and reliability of SiC<sub>f</sub>/SiC composites after EBCs exfoliation, an integrated design concept is proposed to use Si reactive melt infiltration to prepare integrated EBC- SiC<sub>f</sub>/SiC composites in this work. It can form a quasi-EBC layer with EBC components on the surface of SiC<sub>f</sub>/SiC composites. The integrated structure has stronger bonding strength than the conventional coating and matrix. During thermal shock cycling, its thermal shock resistance can be enhanced by consuming SiO<sub>2</sub> to form Yb<sub>2</sub>Si<sub>2</sub>O<sub>7</sub> with good damage tolerance. Meanwhile, the presence of quasi-EBC layer is expected to provide secondary protection for SiC<sub>f</sub>/SiC composites after conventional EBC stripping, which can improve the service life of SiC<sub>f</sub>/SiC composites. This work provides a new idea for the long-life modification of SiC<sub>f</sub>/SiC composites.</div></div>","PeriodicalId":10660,"journal":{"name":"Composites Part B: Engineering","volume":"295 ","pages":"Article 112190"},"PeriodicalIF":12.7,"publicationDate":"2025-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143097708","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Enhanced EMI shielding and mechanical stability via deformable MXene-rNGO conductive networks in superelastic PDMS composite

IF 12.7 1区材料科学 Q1 ENGINEERING, MULTIDISCIPLINARY

Composites Part B: Engineering

Pub Date : 2025-01-31 DOI: 10.1016/j.compositesb.2025.112198

Yaqiang Duan, Yuchen Gu, Weijun Yang, Pengwu Xu, Yunpeng Huang, Piming Ma

Traditional conductive composites are often vulnerable during the deformation process, leading to decrease electromagnetic interference (EMI) shielding efficiency (SE). In this work, a deformable conductive network was innovatively constructed by assembling multiple flexible interfaces to stabilize the EMI SE. The reduced N-doped graphene oxide (rNGO) and exfoliated MXene with different surface charges were successively coated on the surface of thermal expansion microspheres (TEMs, diameter about 11 μm) to construct a conductive shell with flexible splicing interfaces. Further, the assembled functional microspheres (TM@rNG-MX) were hybridized with poly(dimethysiloxane) (PDMS) and then thermally expanded to obtain the multifunctional PDMS/TM@rNG-MX composite. The dynamic connection between rNGO and MXene on the expanded TEMs (diameter about 29 μm) was efficient for establishing 3D deformable conductive networks, which remained intact even after significantly deforming the PDMS composite (strain of 80 %). Surprisingly, the EMI SE (X band) of PDMS/TM@rNG-MX reached 48.8 dB under a low filling content of rNGO and MXene (2.6 wt%), which remained stable after being stretched. In addition, PDMS/TM@rNG-MX had excellent superelasticity and fatigue resistance properties, and the energy loss coefficient reached 72.03 % at 80 % compression, indicating the extraordinary ability on absorbing impact energy. Therefore, this study presents an innovative approach to effectively enhance the mechanical stabilities and EMI shielding performance of flexible and conductive composites.

{"title":"Enhanced EMI shielding and mechanical stability via deformable MXene-rNGO conductive networks in superelastic PDMS composite","authors":"Yaqiang Duan, Yuchen Gu, Weijun Yang, Pengwu Xu, Yunpeng Huang, Piming Ma","doi":"10.1016/j.compositesb.2025.112198","DOIUrl":"10.1016/j.compositesb.2025.112198","url":null,"abstract":"<div><div>Traditional conductive composites are often vulnerable during the deformation process, leading to decrease electromagnetic interference (EMI) shielding efficiency (SE). In this work, a deformable conductive network was innovatively constructed by assembling multiple flexible interfaces to stabilize the EMI SE. The reduced N-doped graphene oxide (rNGO) and exfoliated MXene with different surface charges were successively coated on the surface of thermal expansion microspheres (TEMs, diameter about 11 μm) to construct a conductive shell with flexible splicing interfaces. Further, the assembled functional microspheres (TM@rNG-MX) were hybridized with poly(dimethysiloxane) (PDMS) and then thermally expanded to obtain the multifunctional PDMS/TM@rNG-MX composite. The dynamic connection between rNGO and MXene on the expanded TEMs (diameter about 29 μm) was efficient for establishing 3D deformable conductive networks, which remained intact even after significantly deforming the PDMS composite (strain of 80 %). Surprisingly, the EMI SE (X band) of PDMS/TM@rNG-MX reached 48.8 dB under a low filling content of rNGO and MXene (2.6 wt%), which remained stable after being stretched. In addition, PDMS/TM@rNG-MX had excellent superelasticity and fatigue resistance properties, and the energy loss coefficient reached 72.03 % at 80 % compression, indicating the extraordinary ability on absorbing impact energy. Therefore, this study presents an innovative approach to effectively enhance the mechanical stabilities and EMI shielding performance of flexible and conductive composites.</div></div>","PeriodicalId":10660,"journal":{"name":"Composites Part B: Engineering","volume":"295 ","pages":"Article 112198"},"PeriodicalIF":12.7,"publicationDate":"2025-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143318646","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

All-in-One layer-structured multi-functional conductive polypyrrole coated polyimide aerogel

IF 12.7 1区材料科学 Q1 ENGINEERING, MULTIDISCIPLINARY

Composites Part B: Engineering

Pub Date : 2025-01-31 DOI: 10.1016/j.compositesb.2025.112201

Chuming Ye , Yang Cheng , Mingxin Ye , Jianfeng Shen

Lacking remarkable electromagnetic interference (EMI) shielding materials has been one of the bottlenecks in developing modern electronic devices. Elicited by multifunctional applications in harsh environment, a compromise between high EMI shielding performance and good thermal insulation should be further achieved. However, promoting EMI shielding performance leads to unavoidable thermal insulation increase and mechanical property diminishing. Thus, besides the modification for inherent properties, structure design further unlocks the potential for enhancing applications, offering greater flexibility in optimizing physical properties. Confronting the challenges, the in-situ oxidation polymerized polypyrrole (PPy) coated channel-structured polyimide (PI) composite aerogel material (PIPY) was fabricated through directional freeze-drying. The in-situ oxidation polymerization ensures the formation of a thin and uniform film with both physical and chemical crosslinking, surpassing conventional methods. The ordered structure exhibits commendable electrical conductivity and remarkable anisotropic thermal insulation properties, with the electrical conductivity reaching up to 101.7 S/cm and the heat conductivity at 46 mW m⁻¹ K⁻¹ with 34.1 wt% PPy. The EMI shielding effectiveness of PIPY in the X band (8.2–12.5 GHz) and Ku band (11.9–18.0 GHz) reaches an impressive value of 81.6 dB. The thin PPy film ensures piezoresistive sensing, particularly in perceiving subtle pressure, such as "writing record", "signal transmission" and "motion monitoring", among others.

{"title":"All-in-One layer-structured multi-functional conductive polypyrrole coated polyimide aerogel","authors":"Chuming Ye , Yang Cheng , Mingxin Ye , Jianfeng Shen","doi":"10.1016/j.compositesb.2025.112201","DOIUrl":"10.1016/j.compositesb.2025.112201","url":null,"abstract":"<div><div>Lacking remarkable electromagnetic interference (EMI) shielding materials has been one of the bottlenecks in developing modern electronic devices. Elicited by multifunctional applications in harsh environment, a compromise between high EMI shielding performance and good thermal insulation should be further achieved. However, promoting EMI shielding performance leads to unavoidable thermal insulation increase and mechanical property diminishing. Thus, besides the modification for inherent properties, structure design further unlocks the potential for enhancing applications, offering greater flexibility in optimizing physical properties. Confronting the challenges, the in-situ oxidation polymerized polypyrrole (PPy) coated channel-structured polyimide (PI) composite aerogel material (PIPY) was fabricated through directional freeze-drying. The in-situ oxidation polymerization ensures the formation of a thin and uniform film with both physical and chemical crosslinking, surpassing conventional methods. The ordered structure exhibits commendable electrical conductivity and remarkable anisotropic thermal insulation properties, with the electrical conductivity reaching up to 101.7 S/cm and the heat conductivity at 46 mW m<sup>−1</sup> K<sup>−1</sup> with 34.1 wt% PPy. The EMI shielding effectiveness of PIPY in the X band (8.2–12.5 GHz) and Ku band (11.9–18.0 GHz) reaches an impressive value of 81.6 dB. The thin PPy film ensures piezoresistive sensing, particularly in perceiving subtle pressure, such as \"writing record\", \"signal transmission\" and \"motion monitoring\", among others.</div></div>","PeriodicalId":10660,"journal":{"name":"Composites Part B: Engineering","volume":"295 ","pages":"Article 112201"},"PeriodicalIF":12.7,"publicationDate":"2025-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143318648","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Mechanical performance of novel curved sandwich structures featuring 3D printed continuous carbon fiber/polyamide 6 composite corrugated core with rail interlocking

IF 12.7 1区材料科学 Q1 ENGINEERING, MULTIDISCIPLINARY

Composites Part B: Engineering

Pub Date : 2025-01-31 DOI: 10.1016/j.compositesb.2025.112222

Hui-Jin Um , Hyun-Ji Rho , Na-Hyun Jeon , Ji-Hwan Shin , Hak-Sung Kim

The integration method of skin and core components in sandwich structures significantly influences their overall performance and functionality. This study introduces an innovative design for curved sandwich structures incorporating a rail interlocking mechanism, which demonstrates superior weight-specific mechanical properties compared to conventional joining techniques. The sandwich skins were fabricated using carbon fiber/epoxy composites prepregs via vacuum bagging, while the rail interlocking core structure was manufactured using 3D printing technology with continuous carbon fiber/polyamide filament. Mechanical performance was evaluated through three-point bending tests and compared with alternative joint configurations, including contact, adhesive, and bolt joints. Theoretical analysis was also conducted to derive failure strengths for various failure modes, and failure maps were constructed based on core and skin thickness. The results indicate that the rail interlocking structure exhibited superior mechanical performance, demonstrating an 18.8 % increase in specific strength and up to 22.9 % higher energy absorption capacity compared to adhesive model. The developed theoretical models accurately predicted failure loads across different failure mechanisms, demonstrating excellent agreement with experimental results, notably achieving a deviation of only 4.7 % for the adhesive model. It was noteworthy that the novel rail interlocking sandwich structure showed effectiveness in achieving lightweight design, superior mechanical performance, and practical advantages for curved and large-scale applications is particularly noteworthy.

{"title":"Mechanical performance of novel curved sandwich structures featuring 3D printed continuous carbon fiber/polyamide 6 composite corrugated core with rail interlocking","authors":"Hui-Jin Um , Hyun-Ji Rho , Na-Hyun Jeon , Ji-Hwan Shin , Hak-Sung Kim","doi":"10.1016/j.compositesb.2025.112222","DOIUrl":"10.1016/j.compositesb.2025.112222","url":null,"abstract":"<div><div>The integration method of skin and core components in sandwich structures significantly influences their overall performance and functionality. This study introduces an innovative design for curved sandwich structures incorporating a rail interlocking mechanism, which demonstrates superior weight-specific mechanical properties compared to conventional joining techniques. The sandwich skins were fabricated using carbon fiber/epoxy composites prepregs via vacuum bagging, while the rail interlocking core structure was manufactured using 3D printing technology with continuous carbon fiber/polyamide filament. Mechanical performance was evaluated through three-point bending tests and compared with alternative joint configurations, including contact, adhesive, and bolt joints. Theoretical analysis was also conducted to derive failure strengths for various failure modes, and failure maps were constructed based on core and skin thickness. The results indicate that the rail interlocking structure exhibited superior mechanical performance, demonstrating an 18.8 % increase in specific strength and up to 22.9 % higher energy absorption capacity compared to adhesive model. The developed theoretical models accurately predicted failure loads across different failure mechanisms, demonstrating excellent agreement with experimental results, notably achieving a deviation of only 4.7 % for the adhesive model. It was noteworthy that the novel rail interlocking sandwich structure showed effectiveness in achieving lightweight design, superior mechanical performance, and practical advantages for curved and large-scale applications is particularly noteworthy.</div></div>","PeriodicalId":10660,"journal":{"name":"Composites Part B: Engineering","volume":"295 ","pages":"Article 112222"},"PeriodicalIF":12.7,"publicationDate":"2025-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143318660","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Gallium containing high entropy alloy inhibits biofilm formation and enhances osseointegration

IF 12.7 1区材料科学 Q1 ENGINEERING, MULTIDISCIPLINARY

Composites Part B: Engineering

Pub Date : 2025-01-31 DOI: 10.1016/j.compositesb.2025.112194

Xinchen Zhu , Junfeng Wang , Yun Du , Jian Zhang , Shubin Wang , Da Shu , Yihao Liu , Fupeng Li , Yixuan Lin , Yiqi Yang , Jiang Ju , Tao Yang , Jian He , Chunjie Liu , Kai Huang , Fengxiang Liu , Wentao Lin , Shengbing Yang

Prosthetic joint infections have gained tremendous attention in recent years due to their high treatment costs, severe personal consequences, and heavy social burdens. Antimicrobial high-entropy alloys (HEAs) are considered promising implant materials for PJI prevention because of their mechanical properties surpass those of conventional alloys. In this study, we developed a series of gallium (Ga)-containing HEAs and experimentally identified an appropriate addition ratio of Ga. These alloys not only demonstrated excellent mechanical properties and wear resistance but also exhibited strong antibiofilm activity against methicillin-resistant Staphylococcus aureus (MRSA) and Pseudomonas aeruginosa (P.a), both common in orthopedic infections. Additionally, Ga-containing HEAs showed good biocompatibility and osteoblastic ability and significant antibacterial therapeutic effects in a dorsal subcutaneous implantation model. In conclusion, Ga-containing HEAs raw materials hold promise as ideal implant materials for orthopedic applications.

{"title":"Gallium containing high entropy alloy inhibits biofilm formation and enhances osseointegration","authors":"Xinchen Zhu , Junfeng Wang , Yun Du , Jian Zhang , Shubin Wang , Da Shu , Yihao Liu , Fupeng Li , Yixuan Lin , Yiqi Yang , Jiang Ju , Tao Yang , Jian He , Chunjie Liu , Kai Huang , Fengxiang Liu , Wentao Lin , Shengbing Yang","doi":"10.1016/j.compositesb.2025.112194","DOIUrl":"10.1016/j.compositesb.2025.112194","url":null,"abstract":"<div><div>Prosthetic joint infections have gained tremendous attention in recent years due to their high treatment costs, severe personal consequences, and heavy social burdens. Antimicrobial high-entropy alloys (HEAs) are considered promising implant materials for PJI prevention because of their mechanical properties surpass those of conventional alloys. In this study, we developed a series of gallium (Ga)-containing HEAs and experimentally identified an appropriate addition ratio of Ga. These alloys not only demonstrated excellent mechanical properties and wear resistance but also exhibited strong antibiofilm activity against methicillin-resistant <em>Staphylococcus aureus</em> (MRSA) and <em>Pseudomonas aeruginosa</em> (<em>P.a</em>), both common in orthopedic infections. Additionally, Ga-containing HEAs showed good biocompatibility and osteoblastic ability and significant antibacterial therapeutic effects in a dorsal subcutaneous implantation model. In conclusion, Ga-containing HEAs raw materials hold promise as ideal implant materials for orthopedic applications.</div></div>","PeriodicalId":10660,"journal":{"name":"Composites Part B: Engineering","volume":"295 ","pages":"Article 112194"},"PeriodicalIF":12.7,"publicationDate":"2025-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143318663","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Balancing mechanical properties in tungsten-alumina oxide alloys via coherent/semi-coherent interfaces

IF 12.7 1区材料科学 Q1 ENGINEERING, MULTIDISCIPLINARY

Composites Part B: Engineering

Pub Date : 2025-01-31 DOI: 10.1016/j.compositesb.2025.112204

Fengsong Fan , Jie Wang , Haifeng Xu , Sijia Liu , Huihuang Song , Qiang Chen , Haoyang Wu , Gang Chen , Baorui Jia , Xuanhui Qu , Mingli Qin

The trade-off between strength and toughness has always presented a challenging issue in the development of high-performance metallic structural materials. Introducing hard, non-deforming particles in W metal can effectively enhance strength; however, the severe stress concentration at heterogeneous phasal interfaces often cause strain incompatibility, thereby deteriorating toughness. Here, we constructed robust coherent/semi-coherent W/Al₂O₃ interfaces to achieve a balance between strength and deformability of W/Al₂O₃ materials. Under 15 % compression deformation, our material exhibits a strength exceeding 2200 MPa and an impressive hardness of HV_0.2 = 637.4, among the best sintered dispersion-strengthened W alloys reported. The strong coherent/semi-coherent interfaces between W and Al₂O₃, as confirmed by TEM observations and DFT calculations, effectively hinder crack propagation along the phase boundaries, and instead, the cracks tear the Al₂O₃ particles dispersed at the W grain boundaries, considered responsible for the high ductility. This study provides new insights into the synergistic strengthening of dispersion-strengthened W alloys.

{"title":"Balancing mechanical properties in tungsten-alumina oxide alloys via coherent/semi-coherent interfaces","authors":"Fengsong Fan , Jie Wang , Haifeng Xu , Sijia Liu , Huihuang Song , Qiang Chen , Haoyang Wu , Gang Chen , Baorui Jia , Xuanhui Qu , Mingli Qin","doi":"10.1016/j.compositesb.2025.112204","DOIUrl":"10.1016/j.compositesb.2025.112204","url":null,"abstract":"<div><div>The trade-off between strength and toughness has always presented a challenging issue in the development of high-performance metallic structural materials. Introducing hard, non-deforming particles in W metal can effectively enhance strength; however, the severe stress concentration at heterogeneous phasal interfaces often cause strain incompatibility, thereby deteriorating toughness. Here, we constructed robust coherent/semi-coherent W/Al<sub>2</sub>O<sub>3</sub> interfaces to achieve a balance between strength and deformability of W/Al<sub>2</sub>O<sub>3</sub> materials. Under 15 % compression deformation, our material exhibits a strength exceeding 2200 MPa and an impressive hardness of HV<sub>0.2</sub> = 637.4, among the best sintered dispersion-strengthened W alloys reported. The strong coherent/semi-coherent interfaces between W and Al<sub>2</sub>O<sub>3</sub>, as confirmed by TEM observations and DFT calculations, effectively hinder crack propagation along the phase boundaries, and instead, the cracks tear the Al<sub>2</sub>O<sub>3</sub> particles dispersed at the W grain boundaries, considered responsible for the high ductility. This study provides new insights into the synergistic strengthening of dispersion-strengthened W alloys.</div></div>","PeriodicalId":10660,"journal":{"name":"Composites Part B: Engineering","volume":"295 ","pages":"Article 112204"},"PeriodicalIF":12.7,"publicationDate":"2025-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143101782","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0