作者：
Yi Sun;Liping Yuan;Liandon Tang;Youhua Fan;Jiajing Yu;...
期刊：
Progress in Organic Coatings,2026年210:109707 ISSN：0300-9440
通讯作者：
Liping Yuan<&wdkj&>Jianzheng Qiao
作者机构：
[Yi Sun; Liping Yuan; Liandon Tang; Jiajing Yu; Jianzheng Qiao; Zizhi Huang] School of Material Science and Engineering, Central South University of Forestry and Technology, Changsha, 410004, China;[Youhua Fan] Hunan Academy of Forestry, Changsha, 410004, China
通讯机构：
[Liping Yuan; Jianzheng Qiao] S;School of Material Science and Engineering, Central South University of Forestry and Technology, Changsha, 410004, China
摘要：
Epoxy resin, known for its excellent mechanical properties, chemical resistance, and dimensional stability, has been widely employed in advanced electronic packaging, high-performance coatings, and aerospace engineering. However, its inherent flammability has limited its applications. To address this issue, a ZnAl-NO 3 -LDH was synthesized via co-precipitation and subsequently modified by ion-exchange intercalation with [SiW 12 O 40 ] 4− to form ZnAl-SiW 12 O 40 -LDH (SiW-LDH). The obtained SiW-LDH was then combined with AMP intumescent flame retardants composed of APP, MEL, and PER to enhance the fire resistance properties of the epoxy–polyamide resin (EP). The resulting 2 %SiW-LDH/AMP/EP coatings containing 24.5 wt% AMP and 2 wt% SiW-LDH exhibited excellent flame-retardant properties, achieving an LOI value of 35.3 % and a UL-94 V-0 rating. Additionally, the total heat release (THR) and total smoke production (TSP) recorded during cone calorimeter tests decreased by 69.7 % and 70.9 %, respectively. Moreover, further analysis of the residual char of SiW-LDH/AMP/EP demonstrated that the catalytic carbonization co-effect of AMP and SiW-LDH promoted the formation of a dense and continuous char layer with aromatic structures containing Al O, W O, Si O, W C, Zn 2+ , P–O–C, and P N moieties. Notably, these structures enhanced the flame retardancy, smoke suppression, charring, and thermal insulation properties of the EP. These properties also originated from the dilution of non-combustible gases and the heat-absorbing action upon the thermal decomposition of SiW-LDH/AMP during combustion. Overall, these results demonstrate that the incorporation of SiW-LDH and AMP into epoxy matrices effectively enhances the flame retardancy and thermal insulation properties of polymer systems.
Epoxy resin, known for its excellent mechanical properties, chemical resistance, and dimensional stability, has been widely employed in advanced electronic packaging, high-performance coatings, and aerospace engineering. However, its inherent flammability has limited its applications. To address this issue, a ZnAl-NO 3 -LDH was synthesized via co-precipitation and subsequently modified by ion-exchange intercalation with [SiW 12 O 40 ] 4− to form ZnAl-SiW 12 O 40 -LDH (SiW-LDH). The obtained SiW-LDH was then combined with AMP intumescent flame retardants composed of APP, MEL, and PER to enhance the fire resistance properties of the epoxy–polyamide resin (EP). The resulting 2 %SiW-LDH/AMP/EP coatings containing 24.5 wt% AMP and 2 wt% SiW-LDH exhibited excellent flame-retardant properties, achieving an LOI value of 35.3 % and a UL-94 V-0 rating. Additionally, the total heat release (THR) and total smoke production (TSP) recorded during cone calorimeter tests decreased by 69.7 % and 70.9 %, respectively. Moreover, further analysis of the residual char of SiW-LDH/AMP/EP demonstrated that the catalytic carbonization co-effect of AMP and SiW-LDH promoted the formation of a dense and continuous char layer with aromatic structures containing Al O, W O, Si O, W C, Zn 2+ , P–O–C, and P N moieties. Notably, these structures enhanced the flame retardancy, smoke suppression, charring, and thermal insulation properties of the EP. These properties also originated from the dilution of non-combustible gases and the heat-absorbing action upon the thermal decomposition of SiW-LDH/AMP during combustion. Overall, these results demonstrate that the incorporation of SiW-LDH and AMP into epoxy matrices effectively enhances the flame retardancy and thermal insulation properties of polymer systems.
摘要：
Detection of surface defects from images is crucial to ensure high quality products in manufacturing applications, where surface detection of small defects plays a vital role and has received much attention in the manufacturing industry. However, existing detection solutions perform unevenly in different small defect scenarios. Therefore, this paper proposes an efficient enhancement strategy (RAI) to enhance the model’s ability to detect small surface defects. It consists of two major parts: (i) the feature information enhancement part (ASFR), which consists of a frequency balance (FB) module, an adaptive dilation convolution kernel (ADCK) module, and a spatial feature reorganization (SFR) module, to progressively enhance the semantic information of small defects; and (ii) the subsequent-stage correction interpretation part, which consists of a cross-stage query injection (CQI) mechanism to correct the training focus imbalances and the cascading errors, and fine-grained interpretation of minor defect features. On the engineering side, we applied the strategy to Deformable-Detection Transformer (DETR), Dynamic Anchor Boxes-DETR, and Adamixer, based on three datasets: a self-constructed bamboo slice defect dataset, a defect dataset from Northeastern University, and huggingface surface defects. The experiments were conducted, and mAP50 was improved by 1.7% to 12.5% on the bamboo slice defect test set, 2.4% to 7.8% on the NEU-DET test set, and 2.8% to 4.0% on the huggingface surface defect test set.
Detection of surface defects from images is crucial to ensure high quality products in manufacturing applications, where surface detection of small defects plays a vital role and has received much attention in the manufacturing industry. However, existing detection solutions perform unevenly in different small defect scenarios. Therefore, this paper proposes an efficient enhancement strategy (RAI) to enhance the model’s ability to detect small surface defects. It consists of two major parts: (i) the feature information enhancement part (ASFR), which consists of a frequency balance (FB) module, an adaptive dilation convolution kernel (ADCK) module, and a spatial feature reorganization (SFR) module, to progressively enhance the semantic information of small defects; and (ii) the subsequent-stage correction interpretation part, which consists of a cross-stage query injection (CQI) mechanism to correct the training focus imbalances and the cascading errors, and fine-grained interpretation of minor defect features. On the engineering side, we applied the strategy to Deformable-Detection Transformer (DETR), Dynamic Anchor Boxes-DETR, and Adamixer, based on three datasets: a self-constructed bamboo slice defect dataset, a defect dataset from Northeastern University, and huggingface surface defects. The experiments were conducted, and mAP50 was improved by 1.7% to 12.5% on the bamboo slice defect test set, 2.4% to 7.8% on the NEU-DET test set, and 2.8% to 4.0% on the huggingface surface defect test set.
摘要：
Developing biomass platform compounds into high value-added chemicals is a key step in renewable resource utilization. Herein, we report porous carbon-supported Ni-ZnO nanoparticles catalyst (Ni-ZnO/AC) synthesized via low-temperature coprecipitation, exhibiting excellent performance for the selective hydrogenation of 5-hydroxymethylfurfural (HMF). A linear correlation is first observed between solvent polarity (ET(30)) and product selectivity within both polar aprotic and protic solvent classes, suggesting that solvent properties play a vital role in directing reaction pathways. Among these, 1,4-dioxane (aprotic) favors the formation of 2,5-bis(hydroxymethyl)furan (BHMF) with 97.5% selectivity, while isopropanol (iPrOH, protic) promotes 2,5-dimethylfuran production with up to 99.5% selectivity. Mechanistic investigations further reveal that beyond polarity, proton-donating ability is critical in facilitating hydrodeoxygenation. iPrOH enables a hydrogen shuttle mechanism where protons assist in hydroxyl group removal, lowering the activation barrier. In contrast, 1,4-dioxane, lacking hydrogen bond donors, stabilizes BHMF and hinders further conversion. Density functional theory calculations confirm a lower activation energy in iPrOH (0.60 eV) compared to 1,4-dioxane (1.07 eV). This work offers mechanistic insights and a practical strategy for solvent-mediated control of product selectivity in biomass hydrogenation, highlighting the decisive role of solvent-catalyst-substrate interactions.Graphical AbstractA porous carbon-supported Ni-ZnO nanoparticles catalyst (Ni-ZnO/AC) enables solvent-regulated selective hydrogenation of HMF to high-value chemicals (BHMF/DMF), among solvent-catalyst interaction modulates HDO behavior, with lower activation energy in iPrOH versus 1,4-dioxane.
摘要：
Achieving a balance between catalytic efficiency and structural durability remains a key challenge in heterogeneous photo-Fenton-like systems. Herein, we report a robust sodium alginate hydrogel (ACCN) with hard–soft dual interpenetrating networks, constructed by incorporating Cu@MoS 2 nanosheets and carbon dots-modified cellulose nanofibrils (CNF@CDs). This structural design enables pan-regional photo-Fenton-like catalysis via structural optimization and directed electron transport, thereby ensuring sustained ciprofloxacin (CIP) degradation. Three key features synergistically enhance both catalytic performance and material integrity: (1) a dual interpenetrating network comprising Cu 2+ -crosslinked sodium alginate (SA, soft phase) and hydrogen-bonded CNF@CDs (rigid phase), which reinforces mechanical strength and prevents Cu@MoS 2 leaching; (2) the SA/CNF@CDs network exhibits an ultrahigh CIP adsorption capacity, which spatially concentrates pollutants and accelerates reaction kinetics; and (3) CNF@CDs facilitates electron transfer from Cu@MoS 2 to Cu 2+ crosslinking sites, promoting pan-regional Cu 2+ /Cu + redox cycling. This spatial–electronic integration endows ACCN with a CIP degradation rate constant of 0.0426 min −1 —7.5-fold higher than that of Cu@MoS 2 . Furthermore, ACCN demonstrates excellent durability and reusability, maintaining over 95 % catalytic activity after 10 cycles, with Mo leaching below 8 ppb. This work provides a sustainable strategy for integrating structural and electronic modulation to enable high-efficiency, durable antibiotic wastewater treatment.
Achieving a balance between catalytic efficiency and structural durability remains a key challenge in heterogeneous photo-Fenton-like systems. Herein, we report a robust sodium alginate hydrogel (ACCN) with hard–soft dual interpenetrating networks, constructed by incorporating Cu@MoS 2 nanosheets and carbon dots-modified cellulose nanofibrils (CNF@CDs). This structural design enables pan-regional photo-Fenton-like catalysis via structural optimization and directed electron transport, thereby ensuring sustained ciprofloxacin (CIP) degradation. Three key features synergistically enhance both catalytic performance and material integrity: (1) a dual interpenetrating network comprising Cu 2+ -crosslinked sodium alginate (SA, soft phase) and hydrogen-bonded CNF@CDs (rigid phase), which reinforces mechanical strength and prevents Cu@MoS 2 leaching; (2) the SA/CNF@CDs network exhibits an ultrahigh CIP adsorption capacity, which spatially concentrates pollutants and accelerates reaction kinetics; and (3) CNF@CDs facilitates electron transfer from Cu@MoS 2 to Cu 2+ crosslinking sites, promoting pan-regional Cu 2+ /Cu + redox cycling. This spatial–electronic integration endows ACCN with a CIP degradation rate constant of 0.0426 min −1 —7.5-fold higher than that of Cu@MoS 2 . Furthermore, ACCN demonstrates excellent durability and reusability, maintaining over 95 % catalytic activity after 10 cycles, with Mo leaching below 8 ppb. This work provides a sustainable strategy for integrating structural and electronic modulation to enable high-efficiency, durable antibiotic wastewater treatment.
通讯作者：
Dong, Jianyu;Ren, Tian-Bing;Yin, Shuang-Feng;Zhou, YB;Dong, JY;Yin, SF
作者机构：
[Zhou, Yongbo; Xie, Shimin; Yin, Shuang-Feng; Wu, Shaofeng; Ren, Tian-Bing; Dong, Jianyu; Han, Li-Biao; Shen, Yang; Zhou, YB; Cai, Fangfang; Shang, Qian; Yuan, Lin; Liu, Feng; Su, Lebin; Pan, Neng; Dong, JY; Yin, SF] Hunan Univ, Coll Chem & Chem Engn, State Key Lab Chemo Biosensing & Chemometr, Changsha, Peoples R China.;[Xie, Shimin; Dong, JY; Dong, Jianyu; Su, Lebin] Hunan First Normal Univ, Sch Phys & Chem, Changsha, Peoples R China.;[Yin, Shuang-Feng; Yin, SF] Cent South Univ Forestry & Technol, Coll Mat Sci & Engn, Changsha, Peoples R China.
通讯机构：
[Zhou, YB ; Dong, JY ; Ren, TB; Dong, JY; Yin, SF] H;[Yin, SF ] C;Hunan Univ, Coll Chem & Chem Engn, State Key Lab Chemo Biosensing & Chemometr, Changsha, Peoples R China.;Hunan First Normal Univ, Sch Phys & Chem, Changsha, Peoples R China.;Cent South Univ Forestry & Technol, Coll Mat Sci & Engn, Changsha, Peoples R China.
摘要：
(Hetero)polyaryl amines are extensively prevalent in pharmaceuticals, fine chemicals, and materials but the intricate and varied nature of their structures severely restricts their synthesis. Here, we present a selective multicomponent cycloaromatization of structurally and functionally diverse amine substrates for the general and modular synthesis of (hetero)polyaryl amines through copper(I)-catalysis. This strategy directly constructs a remarkable range of amino group-functionalized (hetero)polyaryl frameworks (194 examples), including naphthalene, binaphthalene, phenanthren, benzothiophene, dibenzothiophene, benzofuran, dibenzofuran, quinoline, isoquinoline, quinazoline, and others, which are challenging or impossible to obtain using alternative methods. Copper(III)-acetylide species are involved in driving the exclusive 7-endo-dig cyclization, suppressing many side-reactions that are susceptible to occur. Due to the easy introduction of various functional units into heteropolyarylamines, multiple functionalized fluorescent dyes can be arbitrarily synthesized, which can serve as effective fluorescent probes for monitoring the pathological processes (e.g. chemotherapy-induced cell apoptosis) and studying the related disease mechanisms.
摘要：
The development of magnesium oxychloride and bamboo composite inorganic cementitious materials can reduce environmental pollution, utilize bamboo waste, and enhance energy efficiency. However, the accumulation of internal stress during the hydration of bamboo scraps/magnesium oxychloride inorganic cementitious materials can lead to pore cracking. Additionally, strength-forming crystals absorb water and deliquesce, resulting in structural failure due to loosening. Promoting the formation of matrix-strengthening crystals can improve the mechanical strength and water resistance of composites. Maltitol, which contains numerous hydroxyl groups, can be adsorbed onto the surface of cement particles, forming hydrogen bonds with water molecules. This enhances the water retention rate and improves the initial viscosity of the slurry. Therefore, this study investigated the effects of maltitol dosage on the mechanical properties, water resistance, and crystal quantity of the composite through single-factor experiments. The overall compressive strength of the modified composite reached 2.8 MPa, with a 20.4 % increase in the softening coefficient. These results confirm that the addition of maltitol promoted crystal growth and enhanced the water resistance of the composite. In the future, this lightweight, waterproof, and environmentally friendly material may help improve the energy efficiency of buildings or furniture decoration.
The development of magnesium oxychloride and bamboo composite inorganic cementitious materials can reduce environmental pollution, utilize bamboo waste, and enhance energy efficiency. However, the accumulation of internal stress during the hydration of bamboo scraps/magnesium oxychloride inorganic cementitious materials can lead to pore cracking. Additionally, strength-forming crystals absorb water and deliquesce, resulting in structural failure due to loosening. Promoting the formation of matrix-strengthening crystals can improve the mechanical strength and water resistance of composites. Maltitol, which contains numerous hydroxyl groups, can be adsorbed onto the surface of cement particles, forming hydrogen bonds with water molecules. This enhances the water retention rate and improves the initial viscosity of the slurry. Therefore, this study investigated the effects of maltitol dosage on the mechanical properties, water resistance, and crystal quantity of the composite through single-factor experiments. The overall compressive strength of the modified composite reached 2.8 MPa, with a 20.4 % increase in the softening coefficient. These results confirm that the addition of maltitol promoted crystal growth and enhanced the water resistance of the composite. In the future, this lightweight, waterproof, and environmentally friendly material may help improve the energy efficiency of buildings or furniture decoration.
期刊：
Industrial Crops and Products,2025年225:120471 ISSN：0926-6690
通讯作者：
Li, XZ
作者机构：
[Lu, Ying; Zhou, Jun; Wang, Yuqing; Li, Xiangzhou; Zhou, Peng; Li, XZ] Cent South Univ Forestry & Technol, Coll Mat Sci & Engn, Changsha 410004, Hunan, Peoples R China.;[Jiang, Zhi] Hunan Prima Drug Res Ctr Co Ltd, Hunan Key Lab Pharmacodynam & Safety Evaluat New D, Changsha 410329, Hunan, Peoples R China.
通讯机构：
[Li, XZ ] C;Cent South Univ Forestry & Technol, Coll Mat Sci & Engn, Changsha 410004, Hunan, Peoples R China.
关键词：
Fir essential oil;Microcapsules;Hydrophobicity;Antifungal;Building materials
摘要：
Natural anti-mildew agents are widely used in wood building materials because of its renewable and environmental protection characteristics. This study innovatively proposed a wood cell cavity to encapsulate plant essential oil for filling wood-based panels, aiming to enhance hydrophobicity and antifungal performance. Essential oil-esterophilic wood microcapsules (EO-EWM) were constructed with the strong natural barrier function of the wood cell walls to encapsulate fir essential oil in the cell cavity. The loading capacity of the essential oil in EO-EWM reached 695.3 mg/g, exhibiting outstanding slow-release properties, with a release rate of 59.9 % after 56 days of simulated release. The release mechanism followed the Fickian diffusion mechanism driven by concentration gradients. During the pressing process of the wood-based panel, the additional amount of EO-EWM was controlled within 30 % to ensure the mechanical properties of the panels. More importantly, the addition of EO-EWM significantly enhanced the self-cleaning capability and hydrophobic performance of the wood-based panels while the risk of mold growth on the panels reduced effectively. Essential oil wood-based panels (EO-WBP) exhibited effective antifungal of 75.0 % against Aspergillus niger and of 83.3 % against Penicillium citrinum . The main mechanism of the anti-mold was that the fir essential oil caused the distortion, shrinkage, and cracking of mycelium, thus inhibiting or killing mold. This study provides an effictive and environmentally friendly strategy for constructing hydrophobic and antifungal properties of wood-based panel for building materials.
Natural anti-mildew agents are widely used in wood building materials because of its renewable and environmental protection characteristics. This study innovatively proposed a wood cell cavity to encapsulate plant essential oil for filling wood-based panels, aiming to enhance hydrophobicity and antifungal performance. Essential oil-esterophilic wood microcapsules (EO-EWM) were constructed with the strong natural barrier function of the wood cell walls to encapsulate fir essential oil in the cell cavity. The loading capacity of the essential oil in EO-EWM reached 695.3 mg/g, exhibiting outstanding slow-release properties, with a release rate of 59.9 % after 56 days of simulated release. The release mechanism followed the Fickian diffusion mechanism driven by concentration gradients. During the pressing process of the wood-based panel, the additional amount of EO-EWM was controlled within 30 % to ensure the mechanical properties of the panels. More importantly, the addition of EO-EWM significantly enhanced the self-cleaning capability and hydrophobic performance of the wood-based panels while the risk of mold growth on the panels reduced effectively. Essential oil wood-based panels (EO-WBP) exhibited effective antifungal of 75.0 % against Aspergillus niger and of 83.3 % against Penicillium citrinum . The main mechanism of the anti-mold was that the fir essential oil caused the distortion, shrinkage, and cracking of mycelium, thus inhibiting or killing mold. This study provides an effictive and environmentally friendly strategy for constructing hydrophobic and antifungal properties of wood-based panel for building materials.
期刊：
Wood Science and Technology,2025年59(2):1-18 ISSN：0043-7719
通讯作者：
Luo, H;Zuo, YF
作者机构：
[Luo, Hong; Xie, Zhijie; Ma, Shuai; Liao, Kai; Li, Lijun] Cent South Univ Forestry & Technol, Engn Res Ctr Forestry Equipment Hunan Prov, Changsha 410004, Peoples R China.;[Luo, Hong; Xie, Zhijie; Ma, Shuai; Liao, Kai; Li, Lijun] Natl Forestry & Grassland Engn Technol Res Ctr Har, Changsha 410004, Peoples R China.;[Zuo, Yingfeng] Cent South Univ Forestry & Technol, Sch Mat Sci & Engn, Changsha 410004, Peoples R China.
通讯机构：
[Luo, H ; Zuo, YF ] C;Cent South Univ Forestry & Technol, Engn Res Ctr Forestry Equipment Hunan Prov, Changsha 410004, Peoples R China.;Natl Forestry & Grassland Engn Technol Res Ctr Har, Changsha 410004, Peoples R China.;Cent South Univ Forestry & Technol, Sch Mat Sci & Engn, Changsha 410004, Peoples R China.
摘要：
Compressive creep tests (CCTs) are widely used in viscoelastic characterisation of wood. However, the prevalent use of dry friction conditions in wood CCTs often introduces considerable uncertainties into the acquired creep data. To address this critical issue, this study proposes a simple yet more accurate CCT-based strategy for viscoelastic characterisation of wood. In this strategy, oil-lubricated conditions are first designed to reduce interfacial friction in CCTs, followed by optimally fitting of the obtained creep data using multi-element (generalised) viscoelastic models. To validate this strategy, comparative CCTs of typical pinewood samples under both oil-lubricated and dry-friction conditions are conducted, and numerical simulations of the CCTs are further performed. The results indicate that: (i) the axial deformation of pinewood in dry-friction CCTs can be significantly underestimated (by up to 28.45%), leading to unrealistic creep data and viscoelastic parameters. (ii) Viscoelastic parameters calibrated from lubricated CCTs can achieve the desired creep prediction accuracy (97.09%), demonstrating a 19.28% improvement over those from unlubricated CCTs. The findings of this study highlight the critical role of reducing interfacial friction in CCTs of the pinewood, with broader implications for the accurate characterisation and prediction of the creep behavior in various woods and timber structures.
关键词：
Rashba–Edelstein effect;symmetry;transition metal dichalcogenides;twisted bilayers
摘要：
It is believed that the generation of Rashba Edelstein effect (REE) in bilayer systems composed of materials with strong spin-orbit coupling is fundamentally governed by the breaking of spatial inversion symmetry ( I ${{\script{I}}}$ ). This symmetry breaking is achieved through simple twisting operations, enabling the occurrence of REE. The REE has been extensively investigated, but the accurate quantitative calculations of this effect remain elusive. Herein, we developed an efficient program to calculate the magneto-electric response tensors of REE. Using this program, the intensities of REE in bilayer 2H-MoS 2 and 2H-MoTe 2 at different twisting angles are calculated, and the magneto-electric response tensors for 2H- and 1T phase MoS 2 at the same twisting angle are compared. Additionally, by comparing REE values of 2H-MoS 2 , 2H-MoSe 2 , and 2H-MoTe 2 at the same twisting angle, the corresponding relationship between SOC and REE is discussed. It is further demonstrated that REE can be strengthened when more symmetries are broken by superimposing slipping before twisting. These calculations show the validity of our method for quantitatively calculating REE, providing a critical tool for studying physical properties mediated by REE.
摘要：
Bamboo particleboards are recognized as a highly promising alternative to traditional wood particleboards owing to their short growth cycle, abundant availability, and exceptional mechanical properties. However, bamboo particleboards frequently exhibit undesirable hygroscopicity, which limits their broader applications. This study introduces a straightforward and inhibitor-free carbonization treatment method to enhance the water resistance properties of bamboo particleboards. During the carbonization process, the degradation of hemicelluloses and amorphous cellulose, combined with the condensation reactions among lignin molecules, leads to a significant reduction in the hydrophilic hydroxyl and carbonyl group content, resulting in a more compact micro-fibril structure. Concurrently, the degradation of specific macromolecules within the cell wall facilitates the crushing of bamboo during particleboard pressing, thereby reducing the macroscopic pore size between the particles in the board. When compared to the original bamboo particleboard, the moisture absorption, 24-h water absorption (at a relative humidity of 50 %), 24-h thickness swelling, and bound water content of the deep carbon bamboo particleboard decreased by 32.28 %, 81.57 %, 67.16 %, and 66.7 %, respectively, while the water contact angle increased by 88.89 %.
Bamboo particleboards are recognized as a highly promising alternative to traditional wood particleboards owing to their short growth cycle, abundant availability, and exceptional mechanical properties. However, bamboo particleboards frequently exhibit undesirable hygroscopicity, which limits their broader applications. This study introduces a straightforward and inhibitor-free carbonization treatment method to enhance the water resistance properties of bamboo particleboards. During the carbonization process, the degradation of hemicelluloses and amorphous cellulose, combined with the condensation reactions among lignin molecules, leads to a significant reduction in the hydrophilic hydroxyl and carbonyl group content, resulting in a more compact micro-fibril structure. Concurrently, the degradation of specific macromolecules within the cell wall facilitates the crushing of bamboo during particleboard pressing, thereby reducing the macroscopic pore size between the particles in the board. When compared to the original bamboo particleboard, the moisture absorption, 24-h water absorption (at a relative humidity of 50 %), 24-h thickness swelling, and bound water content of the deep carbon bamboo particleboard decreased by 32.28 %, 81.57 %, 67.16 %, and 66.7 %, respectively, while the water contact angle increased by 88.89 %.
期刊：
Wood Science and Technology,2025年59(1):1-13 ISSN：0043-7719
通讯作者：
Yuanyuan Liao<&wdkj&>Jinbo Hu
作者机构：
[Jiani Zhou; Gonggang Liu; Xuebing Yi; Yuanyuan Liao; Shanshan Chang; Jinbo Hu] College of Materials Science and Engineering, Central South University of Forestry and Technology, Changsha, China;[Chongqing Wang] School of Chemical Engineering, Zhengzhou University, Zhengzhou, China
通讯机构：
[Yuanyuan Liao; Jinbo Hu] C;College of Materials Science and Engineering, Central South University of Forestry and Technology, Changsha, China<&wdkj&>College of Materials Science and Engineering, Central South University of Forestry and Technology, Changsha, China
摘要：
The exploitation of low-cost, non-fossil membrane materials with flourishing pore structure is essential to complete an organic dye wastewater treatment in Fenton-like catalytic technology. The accessible and scalable veneer functionalized Fenton-like catalysis has been manufactured to decolorize the effluents by a hydrogen peroxide-Mn-based oxides system. The nanocatalyst of Mn-based oxides has been loaded on the veneer surface by the hydrothermal in-situ growth, which could accomplish the coupling of Fenton-like catalyst and membrane technology. Fir and poplar veneers with unique three-dimensional porous structure have been investigated in detail to manifest the respective performance of decolorization during the dye wastewater treatment. This work not only has invented a promising membrane material coupling with Fenton-like catalysis to dispose dye wastewater, but also provides a reference in high-performance membrane design of biomimetic membrane.
摘要：
The inherent structural alignment of Chinese fir scraps utilized in energy storage applications is intriguing. To enhance performance and achieve a symmetrical supercapacitor configuration, nano-pores have been introduced into the carbonized Chinese fir slice, while carbon nanotubes have been synthesized on the tracheid walls to increase its specific surface area. However, achieving high energy density and cycle stability in electrodes remains a significant challenge. Here, the challenge is addressed by synthesizing aligned carbon nanotubes through chemical vapor deposition in Chinese fir tracheids, aiming to enhance conductivity and increase the specific surface area. Furthermore, MnO2 nanosheets are electrochemically deposited on the inner surface of the tracheids to improve specific capacitance to 652.0 F g−1 at 10 mA cm−2. The assembled all-solid-state asymmetric supercapacitor exhibits a high energy density of 48.6 Wh kg−1, which is about twice that of supercapacitors made of other biomass materials. The capacitance of the material remains at 93 % even after undergoing 10,000 charge-discharge cycles within a voltage range of 0 to 1.8 V.
The inherent structural alignment of Chinese fir scraps utilized in energy storage applications is intriguing. To enhance performance and achieve a symmetrical supercapacitor configuration, nano-pores have been introduced into the carbonized Chinese fir slice, while carbon nanotubes have been synthesized on the tracheid walls to increase its specific surface area. However, achieving high energy density and cycle stability in electrodes remains a significant challenge. Here, the challenge is addressed by synthesizing aligned carbon nanotubes through chemical vapor deposition in Chinese fir tracheids, aiming to enhance conductivity and increase the specific surface area. Furthermore, MnO2 nanosheets are electrochemically deposited on the inner surface of the tracheids to improve specific capacitance to 652.0 F g−1 at 10 mA cm−2. The assembled all-solid-state asymmetric supercapacitor exhibits a high energy density of 48.6 Wh kg−1, which is about twice that of supercapacitors made of other biomass materials. The capacitance of the material remains at 93 % even after undergoing 10,000 charge-discharge cycles within a voltage range of 0 to 1.8 V.
期刊：
Industrial Crops and Products,2025年223:120053 ISSN：0926-6690
通讯作者：
Li, Xiazhen;Li, XJ
作者机构：
[Wu, Yongzhong; Yu, Zheng; Li, Xiazhen; Li, Ting; Li, Xianjun] Cent South Univ Forestry & Technol, Coll Mat Sci & Engn, Changsha 410004, Peoples R China.;[Mou, Qunying] Cent South Univ Forestry & Technol, Coll Elect Informat & Phys, Changsha 410004, Peoples R China.;[Li, Ting] Hunan Taohuajiang Bamboo Sci & Technol Co, Taojiang 413400, Peoples R China.;[Cai, Zhiyong] USDA, Forest Prod Lab, Madison, WI USA.;[He, Lin] Changsha Calf Technol Co LTD, Changsha 410035, Peoples R China.
通讯机构：
[Li, XZ; Li, XJ ] 4;498 South Shaoshan Rd, Changsha 410004, Hunan, Peoples R China.
关键词：
Bamboo;Nano-CuO enhancement;Raw material characteristics;Excellent water resistance;High strength;Flame retardancy;Adhesive-free
摘要：
Although the metallization of wood and bamboo has been successfully achieved, challenges such as low efficiency, high costs, and environmental pollution caused by liquid chemical wastes have impeded its widespread adoption in manufacturing. This study presents a novel approach to fabricating metal-reinforced bamboo composite (MRBC) with exceptional performances, utilizing bamboo residues and nano-CuO without use of adhesives. The impact of raw material characteristics, including moisture content of bamboo powder and the amount of nano-CuO additive, on functional properties such as water resistance, flame retardancy and smoke suppression of MRBC was investigated. Also, the forming mechanism of MRBC was elucidated through examination of its microstructure, chemical composition, and thermal stability. Results indicated that the MRBC containing 20 wt% nano-CuO exhibited a high modulus of rupture (MOR) of 54 MPa, an impressive modulus of elasticity (MOE) of 9.3 GPa, a notable surface hardness of 44.4 kgf/mm, and low 24 h water absorption-thickness swelling of 6.5 %, all significantly surpassing those observed in conventional panels. The MRBC exhibited a tightly wrapped, adhered, and cross-linked process under high temperature and pressure conditions, facilitated by multiple synergistic effects such as lignin melting, hydrogen bond networking, physical structure entanglement, and material redox reaction, which contributed to a dense intertwined and consolidated structure. The MRBC demonstrated exceptional structural integrity throughout the combustion process, effectively mitigating potential damage caused by structural collapse due to the incorporation of nano-CuO, which also successfully suppressed smoke and toxic CO gas emissions during combustion. The MRBC showcased advantages of environmental friendliness, water resistance, high strength, flame retardancy and smoke suppression. These attributes position it as an optimal substitute for conventional panels and make it suitable for replacing metals in specific applications. Thus, it demonstrates significant market potential and promising prospects for sustainable development.
Although the metallization of wood and bamboo has been successfully achieved, challenges such as low efficiency, high costs, and environmental pollution caused by liquid chemical wastes have impeded its widespread adoption in manufacturing. This study presents a novel approach to fabricating metal-reinforced bamboo composite (MRBC) with exceptional performances, utilizing bamboo residues and nano-CuO without use of adhesives. The impact of raw material characteristics, including moisture content of bamboo powder and the amount of nano-CuO additive, on functional properties such as water resistance, flame retardancy and smoke suppression of MRBC was investigated. Also, the forming mechanism of MRBC was elucidated through examination of its microstructure, chemical composition, and thermal stability. Results indicated that the MRBC containing 20 wt% nano-CuO exhibited a high modulus of rupture (MOR) of 54 MPa, an impressive modulus of elasticity (MOE) of 9.3 GPa, a notable surface hardness of 44.4 kgf/mm, and low 24 h water absorption-thickness swelling of 6.5 %, all significantly surpassing those observed in conventional panels. The MRBC exhibited a tightly wrapped, adhered, and cross-linked process under high temperature and pressure conditions, facilitated by multiple synergistic effects such as lignin melting, hydrogen bond networking, physical structure entanglement, and material redox reaction, which contributed to a dense intertwined and consolidated structure. The MRBC demonstrated exceptional structural integrity throughout the combustion process, effectively mitigating potential damage caused by structural collapse due to the incorporation of nano-CuO, which also successfully suppressed smoke and toxic CO gas emissions during combustion. The MRBC showcased advantages of environmental friendliness, water resistance, high strength, flame retardancy and smoke suppression. These attributes position it as an optimal substitute for conventional panels and make it suitable for replacing metals in specific applications. Thus, it demonstrates significant market potential and promising prospects for sustainable development.
摘要：
Metal-organic frameworks (MOFs), with excellent structural properties, exhibit unique advantages as promising catalysts in the degradation of emerging organic contaminants (EOCs) by PS-AOPs. Herein, Co-MOF-71 was prepared by hydrothermal method using terephthalic acid (TPA) obtained from the hydrolysis of waste PET plastics as an organic ligand, and the derived cobalt/carbon composite (PETC) was prepared by carbonizing Co-MOF-71 under N 2 atmosphere. Characterizations revealed that PETC800 carbonized at 800 °C possessed a loose and porous layered morphology with a surface area of 148 cm 2 /g, and had a porous structure rich in active sites that are effective in peroxymonosulfate (PMS) activation and tetracycline (TC) degradation. Degradation experiments revealed that the maximum degradation rate of TC by PETC800 could reach 90.94% within 20 min, with a maximum rate constant of 0.2700 min −1 and activation energy of 19.50 kJ/mol, which was lower than that of previous reports. Additional studies confirmed high effectiveness also towards other pharmaceuticals degradation such as metronidazole, levofloxacin and doxorubicin. More importantly, PETC800 could degrade TC efficiently in a broad pH region (3.0–9.0). The degradation performance of TC could be 72.18% after four cycles, demonstrating good reusability. Both radical (•OH, SO 4 •− , and O 2 •− ) and nonradical pathways (singlet oxygen ( 1 O 2 ) and electron transfer) contributed to the TC degradation process, with the non-radical pathway dominating. LC-MS and toxicity analyses have postulated the degradation of TC into intermediates with lower levels of toxicity. The preparation of MOFs-derived catalysts from waste plastics allows resourceful utilization of waste plastics as well as enhances the catalytic performance of MOFs-derived cobalt/carbon-based catalysis for efficient degradation of emerging organic contaminants.
Metal-organic frameworks (MOFs), with excellent structural properties, exhibit unique advantages as promising catalysts in the degradation of emerging organic contaminants (EOCs) by PS-AOPs. Herein, Co-MOF-71 was prepared by hydrothermal method using terephthalic acid (TPA) obtained from the hydrolysis of waste PET plastics as an organic ligand, and the derived cobalt/carbon composite (PETC) was prepared by carbonizing Co-MOF-71 under N 2 atmosphere. Characterizations revealed that PETC800 carbonized at 800 °C possessed a loose and porous layered morphology with a surface area of 148 cm 2 /g, and had a porous structure rich in active sites that are effective in peroxymonosulfate (PMS) activation and tetracycline (TC) degradation. Degradation experiments revealed that the maximum degradation rate of TC by PETC800 could reach 90.94% within 20 min, with a maximum rate constant of 0.2700 min −1 and activation energy of 19.50 kJ/mol, which was lower than that of previous reports. Additional studies confirmed high effectiveness also towards other pharmaceuticals degradation such as metronidazole, levofloxacin and doxorubicin. More importantly, PETC800 could degrade TC efficiently in a broad pH region (3.0–9.0). The degradation performance of TC could be 72.18% after four cycles, demonstrating good reusability. Both radical (•OH, SO 4 •− , and O 2 •− ) and nonradical pathways (singlet oxygen ( 1 O 2 ) and electron transfer) contributed to the TC degradation process, with the non-radical pathway dominating. LC-MS and toxicity analyses have postulated the degradation of TC into intermediates with lower levels of toxicity. The preparation of MOFs-derived catalysts from waste plastics allows resourceful utilization of waste plastics as well as enhances the catalytic performance of MOFs-derived cobalt/carbon-based catalysis for efficient degradation of emerging organic contaminants.
摘要：
Isocyanate is a highly reactive compound that quickly reacts with active hydrogen, posing challenges in its use in emulsion adhesives. Micro/nanoencapsulation technology involves enclosing a core material with a protective shell under specific conditions. Encapsulating isocyanate via micro/nanoencapsulation extends its lifespan in emulsion adhesives and enables controlled release, improving the mechanical strength of the adhesive. In this study, polyurea was used as the shell material and isophorone diisocyanate as the core to prepare isocyanate micro/nanofillers via micro/nanoencapsulation. Isocyanate micro/nanofillers were prepared through interfacial polymerization in an oil-in-water system with process optimization. The obtained isocyanate micro/nanofillers had an active group content of 22.1 wt%. The shielding effect of the shell effectively prolonged the lifespan of isocyanate groups in the emulsion. After six weeks of storage, the isocyanate micro/nanofillers retained most of their activity, showing satisfactory stability. When used as functional cross-linking agents in emulsion adhesives, pressure-induced rupture of the isocyanate micro/nanofillers triggered reactions with compounds containing active hydrogen, forming strong chemical bonds and significantly improving lap shear strength (4.01 MPa), which is 4.22 times that of the original latex. Transforming isocyanate from liquid to solid via micro/nanoencapsulation not only extended its lifespan but also improved bonding performance. The prepared adhesive was solvent-free, energy-efficient, environmentally friendly, clean, low-cost, and offered excellent bonding strength. These findings will enable broad practical applications in wood structural joints, engineering assemblies, and related fields.
Isocyanate is a highly reactive compound that quickly reacts with active hydrogen, posing challenges in its use in emulsion adhesives. Micro/nanoencapsulation technology involves enclosing a core material with a protective shell under specific conditions. Encapsulating isocyanate via micro/nanoencapsulation extends its lifespan in emulsion adhesives and enables controlled release, improving the mechanical strength of the adhesive. In this study, polyurea was used as the shell material and isophorone diisocyanate as the core to prepare isocyanate micro/nanofillers via micro/nanoencapsulation. Isocyanate micro/nanofillers were prepared through interfacial polymerization in an oil-in-water system with process optimization. The obtained isocyanate micro/nanofillers had an active group content of 22.1 wt%. The shielding effect of the shell effectively prolonged the lifespan of isocyanate groups in the emulsion. After six weeks of storage, the isocyanate micro/nanofillers retained most of their activity, showing satisfactory stability. When used as functional cross-linking agents in emulsion adhesives, pressure-induced rupture of the isocyanate micro/nanofillers triggered reactions with compounds containing active hydrogen, forming strong chemical bonds and significantly improving lap shear strength (4.01 MPa), which is 4.22 times that of the original latex. Transforming isocyanate from liquid to solid via micro/nanoencapsulation not only extended its lifespan but also improved bonding performance. The prepared adhesive was solvent-free, energy-efficient, environmentally friendly, clean, low-cost, and offered excellent bonding strength. These findings will enable broad practical applications in wood structural joints, engineering assemblies, and related fields.
摘要：
Heat-treated bamboo bundles (HB) are essential for producing bamboo scrimber, and their fluffing characteristics significantly affect the final product. However, limited research on quantitatively characterizing the fluffing degree of HB has hindered the performance classification, optimization of bamboo scrimber, and its application in areas such as building structures. This study introduced the grayscale image threshold segmentation to obtain eight morphological parameters and their distribution ranges for 200 HB specimens: average diameter (0.26 ∼ 3.42 mm), average fractal dimension (1.12 ∼ 1.25), connectivity (0.11 ∼ 8.45 pcs/mm²), crack ratio ( T-CR ) (6.56 ∼ 90.41 %), fiber bundle area ( T-FBA ) (19.18 ∼ 328.44 mm²), and maximum area of individual fiber bundle ( T-MIFBA ) (1.42 ∼ 286.84 mm²) on the transverse section, crack ratio ( L-CR ) (1.27 ∼ 83.25 %) and fiber bundle area ( L-FBA ) (558 ∼ 11,366 mm²) on the longitudinal section. A multi-scale image analysis approach was employed to analyze the extracted morphological parameters. Relational clustering analysis indicated that the eight morphological parameters can be categorized into four distinct categories. Qualitative clustering analysis revealed clear hierarchical distributions for average diameter and connectivity but fragmented distributions for L-CR and average fractal dimension . Thus, average diameter and connectivity was found to be effective indicators of HB fluffing degree, while L-CR and average fractal dimension were less suitable. This study achieved the quantitative characterization of HB fluffing degree, thereby establishing a solid foundation for optimizing the fluffing process and facilitating the hierarchical classification and utilization of bamboo scrimber.
Heat-treated bamboo bundles (HB) are essential for producing bamboo scrimber, and their fluffing characteristics significantly affect the final product. However, limited research on quantitatively characterizing the fluffing degree of HB has hindered the performance classification, optimization of bamboo scrimber, and its application in areas such as building structures. This study introduced the grayscale image threshold segmentation to obtain eight morphological parameters and their distribution ranges for 200 HB specimens: average diameter (0.26 ∼ 3.42 mm), average fractal dimension (1.12 ∼ 1.25), connectivity (0.11 ∼ 8.45 pcs/mm²), crack ratio ( T-CR ) (6.56 ∼ 90.41 %), fiber bundle area ( T-FBA ) (19.18 ∼ 328.44 mm²), and maximum area of individual fiber bundle ( T-MIFBA ) (1.42 ∼ 286.84 mm²) on the transverse section, crack ratio ( L-CR ) (1.27 ∼ 83.25 %) and fiber bundle area ( L-FBA ) (558 ∼ 11,366 mm²) on the longitudinal section. A multi-scale image analysis approach was employed to analyze the extracted morphological parameters. Relational clustering analysis indicated that the eight morphological parameters can be categorized into four distinct categories. Qualitative clustering analysis revealed clear hierarchical distributions for average diameter and connectivity but fragmented distributions for L-CR and average fractal dimension . Thus, average diameter and connectivity was found to be effective indicators of HB fluffing degree, while L-CR and average fractal dimension were less suitable. This study achieved the quantitative characterization of HB fluffing degree, thereby establishing a solid foundation for optimizing the fluffing process and facilitating the hierarchical classification and utilization of bamboo scrimber.
摘要：
To face the large–scale retirement of lithium–ion batteries (LIBs), direct regeneration of spent NCM622 (LiNi 0.6 Co 0.2 Mn 0.2 O 2 ) cathode can effectively alleviate the current resource and environmental pressures. During the recycling process, the binder polyvinylidene fluoride (PVDF) inevitably becomes an inherent impurity in the active material. Whether the inherent impurity can assist the regeneration of spent NCM or not is becoming a focus of attentions. Hereby, a closed–loop direct regeneration strategy that transforms the inherent PVDF impurity into a F dopant is proposed, and a LiNO 3 –LiOH eutectic molten system is utilized to repair the elemental loss and structural defects in highly degraded NCM622 cathode while achieving F doping. It is found that the fluorine element is uniformly doped into both the surface and bulk phases of the whole material. The F–containing regenerated NCM cathode (R–NCM622–F) shows a stable layered structure with markedly suppressed lattice oxygen escape, as substantiated by the experimental analysis and theoretical calculation. As a result, the obtained R–NCM622–F exhibits a satisfactory repaired specific capacity of 169.6 mAh g −1 and excellent cycling stability, which retains 85.8 % of its initial capacity after 200 cycles. Meanwhile, it can deliver a considerable capacity of 120mAh g −1 even at a high rate of 5C. Clearly, our regeneration strategy obviates the necessity for intricate pretreatments, and instead employs the inherent PVDF impurity to achieve the direct regeneration process, thereby offering a promising avenue to the large–scale direct regeneration of layered cathodes.
To face the large–scale retirement of lithium–ion batteries (LIBs), direct regeneration of spent NCM622 (LiNi 0.6 Co 0.2 Mn 0.2 O 2 ) cathode can effectively alleviate the current resource and environmental pressures. During the recycling process, the binder polyvinylidene fluoride (PVDF) inevitably becomes an inherent impurity in the active material. Whether the inherent impurity can assist the regeneration of spent NCM or not is becoming a focus of attentions. Hereby, a closed–loop direct regeneration strategy that transforms the inherent PVDF impurity into a F dopant is proposed, and a LiNO 3 –LiOH eutectic molten system is utilized to repair the elemental loss and structural defects in highly degraded NCM622 cathode while achieving F doping. It is found that the fluorine element is uniformly doped into both the surface and bulk phases of the whole material. The F–containing regenerated NCM cathode (R–NCM622–F) shows a stable layered structure with markedly suppressed lattice oxygen escape, as substantiated by the experimental analysis and theoretical calculation. As a result, the obtained R–NCM622–F exhibits a satisfactory repaired specific capacity of 169.6 mAh g −1 and excellent cycling stability, which retains 85.8 % of its initial capacity after 200 cycles. Meanwhile, it can deliver a considerable capacity of 120mAh g −1 even at a high rate of 5C. Clearly, our regeneration strategy obviates the necessity for intricate pretreatments, and instead employs the inherent PVDF impurity to achieve the direct regeneration process, thereby offering a promising avenue to the large–scale direct regeneration of layered cathodes.
摘要：
The interaction layer on the rail surface resulting from friction, adhesion, and melting of CuCrZr/AlMgSi friction pairs during ultra-high speed sliding electrical contact, such as in electromagnetic rail launch systems, plays a critical role in determining the lifespan and performance of the copper rail. This study investigates the evolution of the interaction layer microstructure, elemental diffusion behavior , and the formation mechanism of intermetallic compounds (IMCs) and mechanical properties after 45 launches. Results show that copper diffuses into aluminum , forming a diffusion layer in interaction layer. Moreover, there are two diffusion mechanisms with different armature speeds in diffusion layer. At low armature speeds, grain-boundary diffusion dominates as the primary diffusion mechanism within the diffusion layer. The network-like CuAl 2 , CuAl 2 layer and oxide layer result from the combined effects of electricity and mechanical force. With the higher armature speed, temperature and electricity promote the formation of a Al/CuAl 2 /Cu 9 Al 4 /Cu multi-layer semi-coherent interface in the interaction layer governed by the lattice diffusion mechanism. Meanwhile, the interaction layer exhibits mechanical properties with highest nanoindentation hardness (5.03 GPa), elastic modulus (122.74 GPa), and interface bonding strength (262.19 MPa) due to the contribution of IMCs and Al 2 O 3 particles. The findings of this study can provide theoretical guidance for the development of rail and armature contact status and performance, as well as for improving the lifespan and precision of electromagnetic rail launch systems.
The interaction layer on the rail surface resulting from friction, adhesion, and melting of CuCrZr/AlMgSi friction pairs during ultra-high speed sliding electrical contact, such as in electromagnetic rail launch systems, plays a critical role in determining the lifespan and performance of the copper rail. This study investigates the evolution of the interaction layer microstructure, elemental diffusion behavior , and the formation mechanism of intermetallic compounds (IMCs) and mechanical properties after 45 launches. Results show that copper diffuses into aluminum , forming a diffusion layer in interaction layer. Moreover, there are two diffusion mechanisms with different armature speeds in diffusion layer. At low armature speeds, grain-boundary diffusion dominates as the primary diffusion mechanism within the diffusion layer. The network-like CuAl 2 , CuAl 2 layer and oxide layer result from the combined effects of electricity and mechanical force. With the higher armature speed, temperature and electricity promote the formation of a Al/CuAl 2 /Cu 9 Al 4 /Cu multi-layer semi-coherent interface in the interaction layer governed by the lattice diffusion mechanism. Meanwhile, the interaction layer exhibits mechanical properties with highest nanoindentation hardness (5.03 GPa), elastic modulus (122.74 GPa), and interface bonding strength (262.19 MPa) due to the contribution of IMCs and Al 2 O 3 particles. The findings of this study can provide theoretical guidance for the development of rail and armature contact status and performance, as well as for improving the lifespan and precision of electromagnetic rail launch systems.
摘要：
Achieving integration of strong electromagnetic wave (EMW) absorption and wide absorption bandwidth through a single-component carbonaceous absorber is still considered a huge challenge due to the impedance mismatch and limited loss mechanisms. Herein, a reed-derived carbon/epoxy (RC/EP) composite absorber with ultra-wide absorption bandwidth and highly strong EMW absorption was fabricated by simultaneous regulation on the micro-structure of RC and establishment of macro-gradient of RC in EP matrix. The compartmentalized structure and gradient distribution of the optimized RC in the EP matrix boosted the reflection and scattering of the EMW, contributing outstanding impedance matching and synergetic EMW dissipation. Therefore, the RC/EP composite with the thickness of 2.0 mm presented a minimum reflection loss (RL min ) of −54.3 dB and an effective absorption bandwidth (EAB) of 6.12 GHz. Varying the content and distribution of RC, the EAB of the RC/EP can cover 99.7 % of the whole Ku band. In addition, the stealth performance of RC/EP absorbing materials under actual far-field conditions is confirmed using Computer Simulation Technology (CST). This work provides a new way to realize a single-component carbonaceous absorber with both broadband and strong EMW absorbing capability, which can satisfy a wide range of applications in the fields of electronics, medical protection, and architectural invisible materials.
Achieving integration of strong electromagnetic wave (EMW) absorption and wide absorption bandwidth through a single-component carbonaceous absorber is still considered a huge challenge due to the impedance mismatch and limited loss mechanisms. Herein, a reed-derived carbon/epoxy (RC/EP) composite absorber with ultra-wide absorption bandwidth and highly strong EMW absorption was fabricated by simultaneous regulation on the micro-structure of RC and establishment of macro-gradient of RC in EP matrix. The compartmentalized structure and gradient distribution of the optimized RC in the EP matrix boosted the reflection and scattering of the EMW, contributing outstanding impedance matching and synergetic EMW dissipation. Therefore, the RC/EP composite with the thickness of 2.0 mm presented a minimum reflection loss (RL min ) of −54.3 dB and an effective absorption bandwidth (EAB) of 6.12 GHz. Varying the content and distribution of RC, the EAB of the RC/EP can cover 99.7 % of the whole Ku band. In addition, the stealth performance of RC/EP absorbing materials under actual far-field conditions is confirmed using Computer Simulation Technology (CST). This work provides a new way to realize a single-component carbonaceous absorber with both broadband and strong EMW absorbing capability, which can satisfy a wide range of applications in the fields of electronics, medical protection, and architectural invisible materials.
