Composites Science and Technology最新文献

Conformal Al2O3 coating layer improves electrical insulation of the oriented carbon fibers arrays for highly thermally conductive interface materials

IF 8.3 1区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES

Composites Science and Technology

Pub Date : 2025-02-26 DOI: 10.1016/j.compscitech.2025.111128

Min Huang , Ruibang Xie , Zhiqian Wang , Chiyu Wen , Nizao Kong , Chenming Feng , Kaiwen Hou , Zongyun Shao , Fei Han

Mesophase pitch-based carbon fiber is highly sought after in electronic packaging applications due to its excellent thermal conductivity and mechanical properties. However, its poor electrical insulation limits its usage in certain electronic packaging applications. Herein, the carbon fiber is coated with insulating alumina (Al₂O₃) ceramic to improve the insulation properties of the thermal interface materials. The Al₂O₃ coating is formed directly onto the surface of carbon fiber using the sol-gel method and subsequent heat treatment, which substantially improves the insulation of the carbon fiber with an increased powder resistivity of nearly 42 times. Subsequently, the thermally conductive carbon fiber fillers are neatly aligned in the silicone rubber matrix along the vertical direction of heat transfer, which results in excellent properties of the prepared thermally conductive pads. The carbon fiber-filled pads exhibit a high thermal conductivity of 14.17 W m⁻¹ K⁻¹, a high resistivity of 1.12 × 10¹⁰ Ω cm, a medium breakdown voltage of 2.4 kV mm⁻¹, and a favorable compression ratio (@45 psi) of 54.7 %. This work offers a feasible approach for the development of carbon fiber fillers with integrated thermal conductivity and electrical insulation, leading to the expanded application of carbon fiber in electronic packaging.

{"title":"Conformal Al2O3 coating layer improves electrical insulation of the oriented carbon fibers arrays for highly thermally conductive interface materials","authors":"Min Huang , Ruibang Xie , Zhiqian Wang , Chiyu Wen , Nizao Kong , Chenming Feng , Kaiwen Hou , Zongyun Shao , Fei Han","doi":"10.1016/j.compscitech.2025.111128","DOIUrl":"10.1016/j.compscitech.2025.111128","url":null,"abstract":"<div><div>Mesophase pitch-based carbon fiber is highly sought after in electronic packaging applications due to its excellent thermal conductivity and mechanical properties. However, its poor electrical insulation limits its usage in certain electronic packaging applications. Herein, the carbon fiber is coated with insulating alumina (Al<sub>2</sub>O<sub>3</sub>) ceramic to improve the insulation properties of the thermal interface materials. The Al<sub>2</sub>O<sub>3</sub> coating is formed directly onto the surface of carbon fiber using the sol-gel method and subsequent heat treatment, which substantially improves the insulation of the carbon fiber with an increased powder resistivity of nearly 42 times. Subsequently, the thermally conductive carbon fiber fillers are neatly aligned in the silicone rubber matrix along the vertical direction of heat transfer, which results in excellent properties of the prepared thermally conductive pads. The carbon fiber-filled pads exhibit a high thermal conductivity of 14.17 W m<sup>−1</sup> K<sup>−1</sup>, a high resistivity of 1.12 × 10<sup>10</sup> Ω cm, a medium breakdown voltage of 2.4 kV mm<sup>−1</sup>, and a favorable compression ratio (@45 psi) of 54.7 %. This work offers a feasible approach for the development of carbon fiber fillers with integrated thermal conductivity and electrical insulation, leading to the expanded application of carbon fiber in electronic packaging.</div></div>","PeriodicalId":283,"journal":{"name":"Composites Science and Technology","volume":"264 ","pages":"Article 111128"},"PeriodicalIF":8.3,"publicationDate":"2025-02-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143520503","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

A triple action mechanism synergistic interface based on tannic acid/poly (ethylene glycol)/Fe3+ formation for improving the properties of short bamboo fiber/PBSA biocomposites

IF 8.3 1区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES

Composites Science and Technology

Pub Date : 2025-02-25 DOI: 10.1016/j.compscitech.2025.111124

Jian Gao , Yanbin Bi , Yi Zhang , Jixing Su , Yida Wang , Shuangbao Zhang

Bamboo fibers (BFs) reinforced polymer composites face significant challenges in enhancing composite properties due to poor interfacial compatibility. This study is based on the coordination and molecular cross-linking reactions between tannic acid (TA), Fe³⁺, and polyethylene glycol (PEG). A triple-action mechanism interface integrating rigid-flexible balanced, molecular cross-linking and mechanical interlocking was obtained in BFs/PBSA composites by a simple one-pot water reaction and hot pressing process. The interface significantly improved the performance of the composites. Specifically, the tensile strength, tensile modulus, flexural strength, flexural modulus, and impact strength of the composites were increased by 20 %, 13 %, 38 %, 14 %, and 54 %, respectively, while the maximum energy storage modulus was enhanced by 71 %. Additionally, the initial and maximum degradation temperatures increased by 17.1 °C and 19.2 °C, respectively, and water absorption decreased by 34 %. These results demonstrate the promising potential of the interface for preparing high-performance plant fiber-reinforced polymer composites.

{"title":"A triple action mechanism synergistic interface based on tannic acid/poly (ethylene glycol)/Fe3+ formation for improving the properties of short bamboo fiber/PBSA biocomposites","authors":"Jian Gao , Yanbin Bi , Yi Zhang , Jixing Su , Yida Wang , Shuangbao Zhang","doi":"10.1016/j.compscitech.2025.111124","DOIUrl":"10.1016/j.compscitech.2025.111124","url":null,"abstract":"<div><div>Bamboo fibers (BFs) reinforced polymer composites face significant challenges in enhancing composite properties due to poor interfacial compatibility. This study is based on the coordination and molecular cross-linking reactions between tannic acid (TA), Fe<sup>3+</sup>, and polyethylene glycol (PEG). A triple-action mechanism interface integrating rigid-flexible balanced, molecular cross-linking and mechanical interlocking was obtained in BFs/PBSA composites by a simple one-pot water reaction and hot pressing process. The interface significantly improved the performance of the composites. Specifically, the tensile strength, tensile modulus, flexural strength, flexural modulus, and impact strength of the composites were increased by 20 %, 13 %, 38 %, 14 %, and 54 %, respectively, while the maximum energy storage modulus was enhanced by 71 %. Additionally, the initial and maximum degradation temperatures increased by 17.1 °C and 19.2 °C, respectively, and water absorption decreased by 34 %. These results demonstrate the promising potential of the interface for preparing high-performance plant fiber-reinforced polymer composites.</div></div>","PeriodicalId":283,"journal":{"name":"Composites Science and Technology","volume":"264 ","pages":"Article 111124"},"PeriodicalIF":8.3,"publicationDate":"2025-02-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143511333","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

Comparative analysis of NOL-ring tensile strength in towpreg and slit-tape for filament winding: Influence of resin viscosity, tack, and consolidation

IF 8.3 1区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES

Composites Science and Technology

Pub Date : 2025-02-22 DOI: 10.1016/j.compscitech.2025.111123

Eduardo Szpoganicz , Fabian Hübner , Marius Luik , Jeremias Thomas , Florian Max , Andreas Scherer , Tobias Dickhut , Holger Ruckdäschel

This study investigates the tensile strength of carbon-fiber reinforced polymer (CFRP) specimens manufactured via filament winding with varying winding parameters. NOL-rings (Naval Ordnance Laboratories) were processed using unidirectional CFRP material, and the performance of towpregs was compared to slit-tapes of different widths and temperature settings. To establish a benchmark, autoclave-cured prepregs were laminated into flat rectangular samples. The manufacturing process revealed significant variations in laminate strength and ply consolidation, analyzed through optical micrographs and profile analysis. Tensile strengths of the NOL-rings ranged from 1430 MPa to 1800 MPa, with towpregs performing better due to higher tackiness and improved consolidation, compared to slit-tapes with no applied temperature. However, both were still bellow the 2100 MPa strength of autoclave-cured reference samples. Finite element analysis showed that the NOL-ring geometry induces bending stresses, even in an idealized part, reducing the theoretical tensile strength to 1900 MPa. Additionally, in-situ cryogenic testing using liquid nitrogen was reported for the first time for NOL-ring specimens, revealed a significant increase in strength to 2200 MPa, attributed to the stiffening effect at low temperatures. This work introduces a novel approach by correlating ply consolidation with slit-tapes, towpregs, and winding parameters, linking prepreg tackiness to tensile performance, and presenting additionally testing of NOL-rings at 77 K, thus providing understanding of their behavior in cryogenic environments.

{"title":"Comparative analysis of NOL-ring tensile strength in towpreg and slit-tape for filament winding: Influence of resin viscosity, tack, and consolidation","authors":"Eduardo Szpoganicz , Fabian Hübner , Marius Luik , Jeremias Thomas , Florian Max , Andreas Scherer , Tobias Dickhut , Holger Ruckdäschel","doi":"10.1016/j.compscitech.2025.111123","DOIUrl":"10.1016/j.compscitech.2025.111123","url":null,"abstract":"<div><div>This study investigates the tensile strength of carbon-fiber reinforced polymer (CFRP) specimens manufactured via filament winding with varying winding parameters. NOL-rings (Naval Ordnance Laboratories) were processed using unidirectional CFRP material, and the performance of towpregs was compared to slit-tapes of different widths and temperature settings. To establish a benchmark, autoclave-cured prepregs were laminated into flat rectangular samples. The manufacturing process revealed significant variations in laminate strength and ply consolidation, analyzed through optical micrographs and profile analysis. Tensile strengths of the NOL-rings ranged from 1430 MPa to 1800 MPa, with towpregs performing better due to higher tackiness and improved consolidation, compared to slit-tapes with no applied temperature. However, both were still bellow the 2100 MPa strength of autoclave-cured reference samples. Finite element analysis showed that the NOL-ring geometry induces bending stresses, even in an idealized part, reducing the theoretical tensile strength to 1900 MPa. Additionally, in-situ cryogenic testing using liquid nitrogen was reported for the first time for NOL-ring specimens, revealed a significant increase in strength to 2200 MPa, attributed to the stiffening effect at low temperatures. This work introduces a novel approach by correlating ply consolidation with slit-tapes, towpregs, and winding parameters, linking prepreg tackiness to tensile performance, and presenting additionally testing of NOL-rings at 77 K, thus providing understanding of their behavior in cryogenic environments.</div></div>","PeriodicalId":283,"journal":{"name":"Composites Science and Technology","volume":"264 ","pages":"Article 111123"},"PeriodicalIF":8.3,"publicationDate":"2025-02-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143508826","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Macro/micro synergistic thermal conductivity enhancement in liquid metal-based phase change composites for thermal management in electronic devices

IF 8.3 1区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES

Composites Science and Technology

Pub Date : 2025-02-21 DOI: 10.1016/j.compscitech.2025.111120

Guangyin Liu, Kaixun Shang, Shiqi Chen, Jun Shen

Liquid metals (LM) demonstrate significant potential in thermal management applications for electronic devices due to their high thermal conductivity and phase change heat absorption capabilities. However, when combined with organic flexible substrates to create composite materials, the advantages of high thermal conductivity can be substantially diminished. To address this challenge, this study proposes a macro/micro synergistic thermal conductivity enhancement method. By coating LM particles with carbon nanotubes (CNT), the LM@CNT particles that mimics a "neuron" structure was developed. LM@CNT was combined with silicone rubber (SR) to form the LM@CNT/SR, which exhibits micro-level thermal conductivity enhancement. The integration of LM@CNT in SR establishes a thermal conduction network, resulting in a thermal conductivity of 1.37 W/m/K for the LM@CNT/SR. Inspired by the growth rings in tree trunks, vertically aligned graphene films (VAGF) are ingeniously embedded in the composite material to enhance thermal conductivity at the macro-level. The results show that embedding 0.02 mm thick VAGF can increase thermal conductivity by 8.8 W/m/K, while 0.1 mm thick VAGF can achieve an increase of 24.7 W/m/K. The thermal conductivity of LM@CNT/SR/VAGF has obvious anisotropy. Furthermore, the LM@CNT/SR/VAGF demonstrates excellent stability, with negligible changes in thermal conductivity after nearly 2000 temperature cycles. The methodology proposed in this study for producing high thermal conductivity phase change composite materials employs simple and cost-effective processes, offering a novel framework for the mass production of such composites. This approach shows substantial potential for applications in thermal surge protection and thermal management within electronic devices.

{"title":"Macro/micro synergistic thermal conductivity enhancement in liquid metal-based phase change composites for thermal management in electronic devices","authors":"Guangyin Liu, Kaixun Shang, Shiqi Chen, Jun Shen","doi":"10.1016/j.compscitech.2025.111120","DOIUrl":"10.1016/j.compscitech.2025.111120","url":null,"abstract":"<div><div>Liquid metals (LM) demonstrate significant potential in thermal management applications for electronic devices due to their high thermal conductivity and phase change heat absorption capabilities. However, when combined with organic flexible substrates to create composite materials, the advantages of high thermal conductivity can be substantially diminished. To address this challenge, this study proposes a macro/micro synergistic thermal conductivity enhancement method. By coating LM particles with carbon nanotubes (CNT), the LM@CNT particles that mimics a \"neuron\" structure was developed. LM@CNT was combined with silicone rubber (SR) to form the LM@CNT/SR, which exhibits micro-level thermal conductivity enhancement. The integration of LM@CNT in SR establishes a thermal conduction network, resulting in a thermal conductivity of 1.37 W/m/K for the LM@CNT/SR. Inspired by the growth rings in tree trunks, vertically aligned graphene films (VAGF) are ingeniously embedded in the composite material to enhance thermal conductivity at the macro-level. The results show that embedding 0.02 mm thick VAGF can increase thermal conductivity by 8.8 W/m/K, while 0.1 mm thick VAGF can achieve an increase of 24.7 W/m/K. The thermal conductivity of LM@CNT/SR/VAGF has obvious anisotropy. Furthermore, the LM@CNT/SR/VAGF demonstrates excellent stability, with negligible changes in thermal conductivity after nearly 2000 temperature cycles. The methodology proposed in this study for producing high thermal conductivity phase change composite materials employs simple and cost-effective processes, offering a novel framework for the mass production of such composites. This approach shows substantial potential for applications in thermal surge protection and thermal management within electronic devices.</div></div>","PeriodicalId":283,"journal":{"name":"Composites Science and Technology","volume":"264 ","pages":"Article 111120"},"PeriodicalIF":8.3,"publicationDate":"2025-02-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143479656","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

Dynamic polydisulfide-assisted in-situ reduction and encapsulation of nanosilver for fabricating robust photothermal antimicrobial composite textiles

IF 8.3 1区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES

Composites Science and Technology

Pub Date : 2025-02-21 DOI: 10.1016/j.compscitech.2025.111122

Leilei Wu, Yun Yuan, Xinyi Huang, Xiaoyan Liu, Bo Xu, Li Cui, Qiang Wang, Ping Wang

The development of textiles with efficient and long-lasting antimicrobial properties is critical for mitigating medical cross-infections and addressing the growing demands of public health. Herein, an effective approach was demonstrated to fabricate biocompatible composite textiles with robust antimicrobial properties, through dynamic polydisulfide assisted in-situ reduction and encapsulation of nanosilver. Specifically, a reductive platform was established on cotton surfaces by sequentially grafting γ-aminopropyl triethoxysilane and α-lipoic acid (ALA). Subsequently, the amino groups and the dynamically-generated sulfhydryl groups within ALA units were utilized to initiate the reduction of silver ions without the need for additional reductants, thereby forming a stable antibacterial matrix layer on the fiber surface. The resulting fabric exhibits durable antimicrobial properties, achieving a 99.99 % antibacterial and antifungal efficacy even after 50 cycles of standard laundering. Notably, the deposition of silver nanoparticles endows the cotton fabric with significant photothermal conversion ability, and facilitates the generation of multiple bactericidal free radicals. These properties enable the effective eradication of bacteria and fungi on the textile surface within 10 min of irradiation with an intensity of 100 mW/cm². Furthermore, the photothermal antimicrobial fabric retains satisfactory inherent wearability and biocompatibility. The present work provides an alternative for developing robust and durable antimicrobial textiles.

{"title":"Dynamic polydisulfide-assisted in-situ reduction and encapsulation of nanosilver for fabricating robust photothermal antimicrobial composite textiles","authors":"Leilei Wu, Yun Yuan, Xinyi Huang, Xiaoyan Liu, Bo Xu, Li Cui, Qiang Wang, Ping Wang","doi":"10.1016/j.compscitech.2025.111122","DOIUrl":"10.1016/j.compscitech.2025.111122","url":null,"abstract":"<div><div>The development of textiles with efficient and long-lasting antimicrobial properties is critical for mitigating medical cross-infections and addressing the growing demands of public health. Herein, an effective approach was demonstrated to fabricate biocompatible composite textiles with robust antimicrobial properties, through dynamic polydisulfide assisted <em>in-situ</em> reduction and encapsulation of nanosilver. Specifically, a reductive platform was established on cotton surfaces by sequentially grafting γ-aminopropyl triethoxysilane and α-lipoic acid (ALA). Subsequently, the amino groups and the dynamically-generated sulfhydryl groups within ALA units were utilized to initiate the reduction of silver ions without the need for additional reductants, thereby forming a stable antibacterial matrix layer on the fiber surface. The resulting fabric exhibits durable antimicrobial properties, achieving a 99.99 % antibacterial and antifungal efficacy even after 50 cycles of standard laundering. Notably, the deposition of silver nanoparticles endows the cotton fabric with significant photothermal conversion ability, and facilitates the generation of multiple bactericidal free radicals. These properties enable the effective eradication of bacteria and fungi on the textile surface within 10 min of irradiation with an intensity of 100 mW/cm<sup>2</sup>. Furthermore, the photothermal antimicrobial fabric retains satisfactory inherent wearability and biocompatibility. The present work provides an alternative for developing robust and durable antimicrobial textiles.</div></div>","PeriodicalId":283,"journal":{"name":"Composites Science and Technology","volume":"264 ","pages":"Article 111122"},"PeriodicalIF":8.3,"publicationDate":"2025-02-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143479655","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

Stabilizing free radical crosslinked dielectric polymers with metal-organic frameworks: An efficient approach to mitigating dielectric deterioration

IF 8.3 1区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES

Composites Science and Technology

Pub Date : 2025-02-19 DOI: 10.1016/j.compscitech.2025.111109

Zeru Wang , Xie Wang , Hanxue Ren , Xiaotao Zhu , Zeming Fang , Qianfa Liu , Ke Wang

The rise of 5G and 6G technologies has heightened the demand for ultra-low dielectric loss thermosetting composites in advanced electronics. A significant challenge is dielectric degradation at elevated temperatures, primarily due to increased molecular polarizability from thermal aging. Traditional stabilization strategies are ineffective because of their incompatibility with free radical cross-linking reactions and their negative impact on dielectric performance. This study incorporates UiO-66, a metal-organic framework, into thermosetting polyphenylene oxide/1,2-polybutadiene systems, yielding composites with enhanced oxidation resistance and dielectric stability without impeding cross-linking. After 14 days of aging at 150 °C, the UiO-66-modified composite exhibited exceptional dielectric stability, with its dielectric loss increasing to only one-sixth compared to the unmodified system. Fourier-transform infrared and X-ray photoelectron spectroscopy analyses indicate that UiO-66 mitigates the oxidation of unreacted double bonds and delays the formation of C–O and CO groups. These improvements are attributed to UiO-66's exceptional oxygen/ozone adsorption capabilities, along with its free radical quenching abilities, facilitated by its high surface area, porous structure, and abundant open metal sites, confirmed by electron paramagnetic resonance and density functional theory analyses. Furthermore, UiO-66 reduces thermal expansion and increases modulus. This study opens a new avenue for designing and developing high-performance electronic materials with customizable structures and properties.

{"title":"Stabilizing free radical crosslinked dielectric polymers with metal-organic frameworks: An efficient approach to mitigating dielectric deterioration","authors":"Zeru Wang , Xie Wang , Hanxue Ren , Xiaotao Zhu , Zeming Fang , Qianfa Liu , Ke Wang","doi":"10.1016/j.compscitech.2025.111109","DOIUrl":"10.1016/j.compscitech.2025.111109","url":null,"abstract":"<div><div>The rise of 5G and 6G technologies has heightened the demand for ultra-low dielectric loss thermosetting composites in advanced electronics. A significant challenge is dielectric degradation at elevated temperatures, primarily due to increased molecular polarizability from thermal aging. Traditional stabilization strategies are ineffective because of their incompatibility with free radical cross-linking reactions and their negative impact on dielectric performance. This study incorporates UiO-66, a metal-organic framework, into thermosetting polyphenylene oxide/1,2-polybutadiene systems, yielding composites with enhanced oxidation resistance and dielectric stability without impeding cross-linking. After 14 days of aging at 150 °C, the UiO-66-modified composite exhibited exceptional dielectric stability, with its dielectric loss increasing to only one-sixth compared to the unmodified system. Fourier-transform infrared and X-ray photoelectron spectroscopy analyses indicate that UiO-66 mitigates the oxidation of unreacted double bonds and delays the formation of C–O and C<img>O groups. These improvements are attributed to UiO-66's exceptional oxygen/ozone adsorption capabilities, along with its free radical quenching abilities, facilitated by its high surface area, porous structure, and abundant open metal sites, confirmed by electron paramagnetic resonance and density functional theory analyses. Furthermore, UiO-66 reduces thermal expansion and increases modulus. This study opens a new avenue for designing and developing high-performance electronic materials with customizable structures and properties.</div></div>","PeriodicalId":283,"journal":{"name":"Composites Science and Technology","volume":"264 ","pages":"Article 111109"},"PeriodicalIF":8.3,"publicationDate":"2025-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143453267","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

Broadband strong absorption in lightweight metastructure via multiscale modulation

IF 8.3 1区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES

Composites Science and Technology

Pub Date : 2025-02-19 DOI: 10.1016/j.compscitech.2025.111110

Kai Cui, Lei Zheng, Lili Wu, Tao Wang, Xian Wang, Rongzhou Gong

Designing and fabricating an advanced metastructure absorber (MA) with lightweight, broadband, and high absorption efficiency is a promising solution to the growing electromagnetic (EM) pollution issue. Herein, the nano-graphite (NG)/polyamide 12 (PA12) composite filaments were fabricated using hot-melting processing, with the dispersion of NG particles in PA12 controlled by varying machining times. Analytical results revealed that improved dispersion of NG particles in the PA12 matrix significantly enhances the EM loss capability of the composite filaments, primarily due to increased conductive paths and interfacial contact area. Subsequently, a multilayer honeycomb structure with a bi-gradient material-structure was developed to improve the impedance matching of carbon-based composites. Simulations revealed that the proposed MA achieved a reflection loss (RL) below −10 dB in the 2–18 GHz with a relative bandwidth of up to 160 %, and exhibited a strong RL below −20 dB in the 4.2–18 GHz range. Finally, the MA was fabricated using 3D printing technology and demonstrated excellent agreement between the experimental RL and simulation results. Importantly, this research offers new insights into the modulation of EM property in carbon-based composite filaments and the design of MA with integrated broadband and high efficiency.

{"title":"Broadband strong absorption in lightweight metastructure via multiscale modulation","authors":"Kai Cui, Lei Zheng, Lili Wu, Tao Wang, Xian Wang, Rongzhou Gong","doi":"10.1016/j.compscitech.2025.111110","DOIUrl":"10.1016/j.compscitech.2025.111110","url":null,"abstract":"<div><div>Designing and fabricating an advanced metastructure absorber (MA) with lightweight, broadband, and high absorption efficiency is a promising solution to the growing electromagnetic (EM) pollution issue. Herein, the nano-graphite (NG)/polyamide 12 (PA12) composite filaments were fabricated using hot-melting processing, with the dispersion of NG particles in PA12 controlled by varying machining times. Analytical results revealed that improved dispersion of NG particles in the PA12 matrix significantly enhances the EM loss capability of the composite filaments, primarily due to increased conductive paths and interfacial contact area. Subsequently, a multilayer honeycomb structure with a bi-gradient material-structure was developed to improve the impedance matching of carbon-based composites. Simulations revealed that the proposed MA achieved a reflection loss (RL) below −10 dB in the 2–18 GHz with a relative bandwidth of up to 160 %, and exhibited a strong RL below −20 dB in the 4.2–18 GHz range. Finally, the MA was fabricated using 3D printing technology and demonstrated excellent agreement between the experimental RL and simulation results. Importantly, this research offers new insights into the modulation of EM property in carbon-based composite filaments and the design of MA with integrated broadband and high efficiency.</div></div>","PeriodicalId":283,"journal":{"name":"Composites Science and Technology","volume":"264 ","pages":"Article 111110"},"PeriodicalIF":8.3,"publicationDate":"2025-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143464670","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

Tree-inspired bio-composites with 3D anisotropic thermal and electrical conductivities prepared by parallel-engineered graphene integration

IF 8.3 1区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES

Composites Science and Technology

Pub Date : 2025-02-19 DOI: 10.1016/j.compscitech.2025.111112

Jin Guo , Zhengbin He , Rongjun Wei , Jingjing Gao , Runan Gao , Zhenyu Wang , Songlin Yi

In nature, numerous bio-materials exhibit anisotropic physical and chemical properties, attributable to their distinctive microstructural characteristics. Inspired by this, artificial composites can be meticulously designed to replicate such anisotropic behavior and attain targeted properties. Here, we successfully constructed wood/graphene bio-composites with parallel-aligned graphene structures by a synergistic process of electrostatic self-assembly and densification using delignified wood as a template. Through the design of parallel-arranged graphene structures, the modulation of phonon and electron transport paths is achieved and differentiated propagation properties are exhibited along different directions. This structural arrangement endows the bio-composites with unique 3D orthogonal anisotropic thermal and electrical conductivity properties. Specifically, the bio-composites integrated with 0.5 wt% graphene demonstrated thermal conductivity of 0.77, 0.25, and 0.12 W/m·K⁻¹ in the x, y, and z directions, respectively, representing a significant enhancement of 2.1–11.8 times over that of natural wood. Concurrently, the electrical conductivity in different directions was markedly improved from 10⁻¹² to 10⁻⁴-10⁰ S/cm. Furthermore, the bio-composites showcased superior tensile strength, reaching up to 79.1 MPa, along with notable flame-retardant properties. In Summary, this research provides a pioneering strategy for the preparation of composites with 3D orthogonal anisotropic thermal and electrical properties, a functionality that enables them to be used for thermal management applications such as thermal insulation and heat dissipation.

{"title":"Tree-inspired bio-composites with 3D anisotropic thermal and electrical conductivities prepared by parallel-engineered graphene integration","authors":"Jin Guo , Zhengbin He , Rongjun Wei , Jingjing Gao , Runan Gao , Zhenyu Wang , Songlin Yi","doi":"10.1016/j.compscitech.2025.111112","DOIUrl":"10.1016/j.compscitech.2025.111112","url":null,"abstract":"<div><div>In nature, numerous bio-materials exhibit anisotropic physical and chemical properties, attributable to their distinctive microstructural characteristics. Inspired by this, artificial composites can be meticulously designed to replicate such anisotropic behavior and attain targeted properties. Here, we successfully constructed wood/graphene bio-composites with parallel-aligned graphene structures by a synergistic process of electrostatic self-assembly and densification using delignified wood as a template. Through the design of parallel-arranged graphene structures, the modulation of phonon and electron transport paths is achieved and differentiated propagation properties are exhibited along different directions. This structural arrangement endows the bio-composites with unique 3D orthogonal anisotropic thermal and electrical conductivity properties. Specifically, the bio-composites integrated with 0.5 wt% graphene demonstrated thermal conductivity of 0.77, 0.25, and 0.12 W/m·K<sup>−1</sup> in the x, y, and z directions, respectively, representing a significant enhancement of 2.1–11.8 times over that of natural wood. Concurrently, the electrical conductivity in different directions was markedly improved from 10<sup>−12</sup> to 10<sup>−4</sup>-10<sup>0</sup> S/cm. Furthermore, the bio-composites showcased superior tensile strength, reaching up to 79.1 MPa, along with notable flame-retardant properties. In Summary, this research provides a pioneering strategy for the preparation of composites with 3D orthogonal anisotropic thermal and electrical properties, a functionality that enables them to be used for thermal management applications such as thermal insulation and heat dissipation.</div></div>","PeriodicalId":283,"journal":{"name":"Composites Science and Technology","volume":"264 ","pages":"Article 111112"},"PeriodicalIF":8.3,"publicationDate":"2025-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143464553","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

Renewable superhydrophobic antifouling composite silicone based on micro-nano structure

IF 8.3 1区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES

Composites Science and Technology

Pub Date : 2025-02-19 DOI: 10.1016/j.compscitech.2025.111111

Dong Tian , Kaiming Zhang , Lixin Sun , Zhihao Rong , Dejin Zhang , Lei Liu , Yahui Wu , Chuanhui Gao , Ze Kan , Yuetao Liu

The development of silicone-based superhydrophobic coatings is highly desirable for antifouling applications. However, achieving durable coatings remains challenging. Superhydrophobicity is often lost after mechanical damage or microorganism penetration, which compromises the static antifouling ability. Herein, we propose a straightforward strategy for fabricating a silicone coating (F-PIBO-40 %) based on a simple condensation reaction between a novel silane telomer (F-PIBO) and α,ω-dihydroxypolydimethylsiloxane (PDMS). Moreover, nano-sized silica particles (SiO₂) were uniformly incorporated to construct micro-nano rough structures and enhance the durability. The mechanical and environmental durability, self-cleaning, antibacterial and anti-diatom performance were comprehensively characterized. The results revealed that even after 400 damage cycles (8000 cm of wear), the contact angle remained above 165°. The superhydrophobic surface could be simply renewed through friction, minimizing the cost of use and replacement. Furthermore, the coating retained its superhydrophobic properties after exposure to UV radiation, hot/cold temperature cycling, and immersion in various polar and non-polar solvents. The synergistic effects of the isobornyl groups and the superhydrophobicity contributed to the excellent self-cleaning, antibacterial, and anti-diatom performance. We believe that this work provides a new approach for the preparation of multi-environmentally reliable, durable, and surface-renewable superhydrophobic antifouling coatings.

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引用次数: 0

Flexible triple-layer graphene composites for broadband high-absorption electromagnetic shielding

IF 8.3 1区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES

Composites Science and Technology

Pub Date : 2025-02-14 DOI: 10.1016/j.compscitech.2025.111108

Mehran Ashouri-Sanjani , Reza Rahmati , Mahdi Hamidinejad , Chul B. Park

Electromagnetic interference (EMI) presents significant challenges in today's electronics, disrupting device performance and posing health risks. We introduce a novel flexible composite with exceptional EMI shielding effectiveness and absorption-dominated performance across the Ku-band (12.4–18 GHz). The composite features a strategically engineered triple-layer architecture: two layers of reduced graphene oxide (rGO) aerogels with aligned porosities and a dense rGO film, all embedded within a polydimethylsiloxane (PDMS) matrix. This design achieves an outstanding average absorptivity of 95.4 % and a total shielding effectiveness of 42.6 dB within a minimal thickness of 2.5 mm. The superior performance arises from meticulous tuning of each layer's electrical conductivity, optimizing impedance matching and enhancing electromagnetic absorption through multiple reflection and scattering mechanisms. Finite element method simulations elucidate the electromagnetic interactions within the multilayer structure, confirming the effectiveness of our design. This work pioneers the development of next-generation EMI shielding materials that synergistically combine high absorptivity, mechanical flexibility, and robust performance, meeting the demanding requirements of modern electronics.

{"title":"Flexible triple-layer graphene composites for broadband high-absorption electromagnetic shielding","authors":"Mehran Ashouri-Sanjani , Reza Rahmati , Mahdi Hamidinejad , Chul B. Park","doi":"10.1016/j.compscitech.2025.111108","DOIUrl":"10.1016/j.compscitech.2025.111108","url":null,"abstract":"<div><div>Electromagnetic interference (EMI) presents significant challenges in today's electronics, disrupting device performance and posing health risks. We introduce a novel flexible composite with exceptional EMI shielding effectiveness and absorption-dominated performance across the Ku-band (12.4–18 GHz). The composite features a strategically engineered triple-layer architecture: two layers of reduced graphene oxide (rGO) aerogels with aligned porosities and a dense rGO film, all embedded within a polydimethylsiloxane (PDMS) matrix. This design achieves an outstanding average absorptivity of 95.4 % and a total shielding effectiveness of 42.6 dB within a minimal thickness of 2.5 mm. The superior performance arises from meticulous tuning of each layer's electrical conductivity, optimizing impedance matching and enhancing electromagnetic absorption through multiple reflection and scattering mechanisms. Finite element method simulations elucidate the electromagnetic interactions within the multilayer structure, confirming the effectiveness of our design. This work pioneers the development of next-generation EMI shielding materials that synergistically combine high absorptivity, mechanical flexibility, and robust performance, meeting the demanding requirements of modern electronics.</div></div>","PeriodicalId":283,"journal":{"name":"Composites Science and Technology","volume":"263 ","pages":"Article 111108"},"PeriodicalIF":8.3,"publicationDate":"2025-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143421397","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