Elastomer damping materials have unique dynamic viscoelastic behavior and are widely used in many fields such as vibration damping and noise reduction. In practical applications, elastomer damping materials often face the problems of narrow effective damping temperature range and low loss factor. Widening the effective damping temperature range and increasing the loss factor are the main directions for the development of high performance elastomer damping materials. Based on the damping mechanism of elastomer damping materials, this paper expounds the influence of molecular structure, operating temperature and vibration frequency, and elastomer composition system on the damping performance of elastomer damping materials. The modification methods of elastomer damping materials and the latest research progress in recent years are also introduced.

Silicon-carbon materials have a promising development as anode materials for lithium-ion batteries. In this experiment, sucrose carbon/silicon composites (SC/Si) were prepared by hydrothermal and high-temperature carbonization methods, and on this basis, sucrose carbon/silicon graphite composites (SC/Si-Gr) with graphite conductive skeleton structure were prepared and investigated for their electrochemical and battery performance as anode materials for lithium-ion batteries. The results reveal that sucrose carbon is evenly coated on the surface of silicon nanoparticles, and that the electrochemical and battery performance of the produced sucrose carbon/silicon composites improve with increasing sucrose carbon concentration. With the introduction of graphite, the electrochemical performance of the constructed SC/Si-Gr ternary composites is further enhanced. When the sucrose:silicon:graphite feeding mass ratio is 1∶1∶0.5, the formed SC/Si-Gr (1∶1∶0.5) composite has a discharge specific capacity of 1 005.1 mAh/g after the third cycle of stability at a current density of 0.1 A/g. The discharge specific capacity is 819 mAh/g after 100 cycles, and the charge/discharge Coulomb efficiency is maintained at about 98%. The average discharge specific capacity is 437.91 mAh/g at a high current density of 1 A/g. This is due to the addition of graphite, which creates a strong conductive skeleton structure and boosts lithium ion transport rate and first cycle Coulomb efficiency. As a result, the sucrose carbon/silicon-graphite composite exhibits good cycle stability and charge/discharge the rate performance.

The use of fossil fuels has resulted in environmental pollution and global warming, and traditional porous carbon preparation methods have further exacerbated these issues. Lignin is the most abundant natural aromatic polymer and a good biomass carbon source. Substituting lignin for traditional chemical raw materials to prepare carbon materials can greatly reduce dependence on fossil resources. This paper summarizes the latest progress in the preparation and modification of lignin-based porous carbon (LBPC) and aims to promote its application in various fields. The widespread use of LBPC can alleviate the energy crisis and contribute to sustainable development.

In recent years, graphene/polyurethane nanocomposites have attracted much attention due to their superior comprehensive properties. Incorporating graphene or its derivatives into PU matrix could significantly improve the physical mechanical, thermal, electromagnetic and other properties, which meets the special requirements of high-performance and multi-functional polymer composites. In this paper, the functional modification methods of graphene nanosheets, including covalent modification and non-covalent modification were first introduced. Furthermore, the fabrication processes of graphene/polyurethane nanocomposites, including in-situ polymerization, solution blending, melt blending, aqueous (latex) blending, etc., were briefly introduced. The recent research progress of graphene/polyurethane composites in mechanical, electrical, dielectric, thermal, gas barrier, flame retardant, electromagnetic interference shielding and corrosion resistant properties were all reviewed in detail. The future challenges and development prospects of high-performance graphene/polyurethane nanocomposites were also prospected.

Bacterial infections and their drug resistance are one of the enormous health challenges in the world today, causing huge casualties and economic losses worldwide every year. Hydrogel is a three-dimensional polymer network structure colloid with good hydrophilicity, unique three-dimensional network, good biocompatibility and cell adhesion. Therefore, hydrogel is a new type of biomaterial suitable for the antibacterial application and is expected to become a potential antibacterial material to solve antibiotic resistance. According to the corresponding antibacterial methods, the antibacterial technologies in hydrogels can be roughly classified into the following categories: (i) hydrogels loaded with antibacterial substances; (ii) hydrogels with inherent antibacterial activity; (iii) antibacterial hydrogels using photoresponsive therapy. This article will briefly introduce the basic principles, methods and applications of various hydrogel antibacterial technologies, and preliminarily discuss the difficulties and challenges in the future.

In the context of promoting the“carbon-neutral”strategy, the development of functional materials for energy-saving in communication base stations is of great importance. Given the unique advantages of phase change materials (PCM) in heat-storage, this paper lists the types of PCM and their advantages and disadvantages, and gives a comprehensive overview of the progress of PCM heat-storage for three different application scenarios in energy-saving of communication base stations. From the perspective of facilitating popularization of PCM heat-storage for energy-saving in base stations, the representative research achievements in improving thermal conductivity, packaging technology, and thermal cycle stability of PCM are introduced. This paper will provide a reference for future research directions in the fields of energy-saving for communication base station and PCM heat-storage.

In recent years, the problem of electromagnetic interference and electromagnetic compatibility has become increasingly serious, seriously endangering the safe operation of instruments, meters and other electronic equipment in the military and civilian fields. It is urgent to develop new high-performance electromagnetic shielding materials. Graphene is a new type of two-dimensional carbon nanostructured material with excellent physical and chemical properties, which provides a new solution for the design of flexible, thin and good service performance electromagnetic shielding materials. Starting from the basic principle of electromagnetic shielding, this review introduces the mechanism of electromagnetic shielding and loss and the way of energy conversion. Furthermore, graphene electromagnetic shielding materials were systematically classified and summarized. The shielding efficiency and research progress of graphene electromagnetic shielding materials in recent years were reviewed, and the challenges and development prospects of graphene electromagnetic shielding materials were prospected.

Biomass-derived carbon materials have attracted more and more attention as efficient and cheap supercapacitor electrode materials due to their renewability and flexible microstructure tunability. However, the original biomass-derived carbon has the disadvantages of low porosity, low specific surface area and insufficient specific capacitance. The specific surface area, pore structure and conductivity of electrode materials will affect the energy storage performance of supercapacitors. Therefore, how to fabricate electrode materials with high specific capacitance, fast charge and discharge and certain flexibility has become the focus of current research. In this paper, the classification and energy storage mechanism of supercapacitors and the preparation methods and research status of biomass-based carbon materials are reviewed. The key performance evaluation parameters of high-quality load electrodes are analyzed, and the influencing factors of their electrochemical performance are systematically discussed. The future development trend is to integrate different types of energy storage devices into composite energy storage devices to meet the needs of various fields. Composite energy storage devices have greatly improved the comprehensive performance of supercapacitors. Therefore, the development of efficient and stable energy storage technology is of great significance for alleviating energy shortage, reducing environmental pollution and promoting sustainable development.

Nano-photocatalysts have high efficiency, low energy consumption, no/low pollution, and are widely used in buildings dominated by cement-based materials, showing a good application prospect. The introduction of photocatalysts into cement-based materials can effectively improve their structural compactness, optimize their mechanical properties, endow them with the functions of pollutant degradation and surface self-cleaning, thus reducing the corrosion rate of cement-based materials and alleviating environmental pollution. This paper summarizes the different preparation methods of photocatalytic cement-based materials, introduces the influence of photocatalyst types on the photocatalytic properties of cement-based materials in detail, discusses the shortcomings of the current photocatalytic cement-based materials modified by nano-photocatalysts, and looks forward to them future development direction.

Molybdenum carbide (Mo₂C) has become a promising electrocatalyst because of its similar d-band electronic structure to platinum (Pt), wide pH applicability, easy synthesis, and low cost. However, pure Mo₂C suffers from poor electrical conductivity, slow interfacial reaction kinetics, and too strong Mo-H bond. In recent years, many studies have reported the modification of Mo₂C-based catalysts to enhance their electrocatalytic hydrogen evolution performance. Based on this, this paper reviews the common preparation process of Mo₂C and various modification strategies to improve the electrocatalytic hydrogen evolution performance of Mo₂C. And intrinsic reasons for the improvement of Mo₂C hydrogen evolution performance by different modification methods are analyzed in deeply. Finally, the current challenges and future development directions of Mo₂C-based electrocatalysts are proposed.

Graphene is a single-layer two-dimensional honeycomb lattice structure with carbon as the basic atom through sp² hybridization, π-π conjugation and tight stacking, which has excellent physical and chemical properties and has become a hot research topic with excellent performance in several fields. Because of the large specific surface area of graphene, it can be used as a matrix, and the resulting graphene-based composites are an important research direction in the field of graphene applications, which can be divided into loaded and reinforced types. This paper mainly reviews the preparation methods and application status of graphene-loaded metal (monometallic, bimetallic and trimetallic)/compound (metal oxide, metal sulfide and metal fluoride) composites in recent years. Furthermore, by summarizing the above composites, it is concluded that issues such as particle size and shape of the metal/compound, degree of dispersion, and stacking of graphene sheet layers affect the performance. It also provides an outlook on the application prospects of graphene-loaded metal/compound composites in the fields of magnetism, mechanics, microwave absorption, and thermal conductivity.

Silica micro spheres are a type of inorganic filler, widely used in electronic packaging, bio-medicine, mechanical polishing, and fluid transportation due to their large specific surface area, high chemical stability, excellent temperature resistance, high mechanical strength, and environmental friendliness. This paper reviews the common preparation methods, such as sol gel method, vapor phase method and high-temperature spheroidization method, and points out the advantages and disadvantages of the methods above. In addition, their applications in composite materials are introduced, and views on the improvement of these methods and the research directions are looked into the future. In addition, this article introduces the principle, advantages, and applications of the creative and novel vapor oxidation method.

Porous silicon is a semiconductor material with a nanostructure formed by electrochemical etching or appropriate chemical etching of single-crystal silicon wafers. With huge specific surface area, tunable optical properties and good compatibility, porous silicon nanomaterials are widely used in electronic devices, drug delivery, biochips, bio-sensing, chemical sensing, energy conversion and many other applications. The challenge of current research is to develop simpler and more efficient methods for the synthesis of porous silicon nanomaterials and to improve the performance of porous silicon in practical applications. This paper reviews the preparation of porous silicon nanomaterials and their photoluminescence applications in the field of solar cells.

Organic pollutants are an important source of water pollution, and their harmless treatment is necessary before discharge. Photocatalytic degradation has attracted extensive attention in recent years due to its mild reaction conditions, high efficiency and wide application range. ZnO is a cheap, stable and non-toxic semiconductor material, which is an ideal photocatalyst. However, its application is limited by the large band gap and easy recombination of photogenerated carriers. Reasonable modification can effectively improve ZnO's light absorption range, promote the separation of photogenerated carriers, and further facilitate the formation of more key intermediate oxidant species and improve its photocatalytic efficiency. In this paper, the design of ZnO-based photocatalyst and its application in photocatalytic degradation of organic pollutants in recent years are reviewed from the perspective of modification methods, including element doping, heterojunction formation and morphology design.

Layered double hydroxides (LDHs) are ideal electrode materials for pseudo-capacitors because of their abundant metal active centers, high specific capacitance and high energy density. NiCo-LDH nanosheets were prepared by a simple solvothermal method using ZIF-67 precursor as cobalt source. In solvothermal process, the nanosheet constructed by cation exchange of Ni²⁺ and Co²⁺ can not only promote electron migration, but also expose more active sites, which is conducive to the rapid transfer of electrolyte ions and Faraday reaction rate. In addition, the electrochemical properties were improved by adjusting the amount of nickel source. The optimized NiCo-LDH-(1∶2) has fast ion transfer capability and excellent magnification performance, and achieves high specific capacitance of 1 356.8 F/g at current density of 1 A/g and retention of specific capacitance of 68.7% at 30 A/g. The assembled asymmetric energy storage device exhibits a high energy density of 34.31 Wh/kg at a power density of 750 W/kg.

Si nanomaterials have attracted much attention from researchers since their appearance. Their unique properties, which are different from macroscopic bulk materials, enable them to be applied in various fields. How to prepare nanomaterials with good morphology and photoelectric properties is a problem that must be solved before the application of nanomaterials. In this work, dense silicon nanowires were directly prepared on Si substrate with Ni film as catalyst, and strong luminescence in blue and purple bands was obtained. The effects of annealing temperature, N₂ flow rate for annealing atmosphere, silicon film thickness and other preparation conditions on the morphology and photoluminescence intensity of silicon nanowires were investigated. The formation and growth mechanism of silicon nanowires prepared with Ni and silicon layers were also discussed. The experimental results show that annealing temperature and N₂ flow rate play a key role in the growth of silicon nanowires, and N₂ flow rate can affect the photoluminescence intensity of silicon nanowires. Higher N₂ flow rate can promote oriented growth of silicon nanowires. Adding Si film with appropriate thickness on Ni film catalyst can also help the growth of silicon nanowires and improve the photoluminescence intensity of silicon nanowires.

Hydrogen production from electrolytic water is a promising green technology, and the use of low-cost carbon materials loaded with noble metals as catalyst substrates is an effective means to reduce the noble metal loading and optimize the performance of hydrogen precipitation catalysts. Herein, Pt/N-Mo₂C NFs were prepared by using ligand polymerization method to obtain precursor microspheres with high specific surface area formed by the self-assembly of nanosheets through pH regulation, and then Pt nanoparticles were uniformly loaded on the surface of nitrogen-doped molybdenum carbide by ion exchange and high temperature roasting. Due to the high dispersion of Pt nanoparticles on N-Mo₂C with multilayered structure and the synergistic effect between Pt and N-Mo₂C substrates, it exhibits very good hydrogen evolution reaction performance. The Pt/N-Mo₂C NFs possess low overpotentials (44 mV/η₁₀ and 137 mV/η₁₀₀), and Tafel slope of 46.2 mV/dec, as well as good stability. The results of this paper have implications for the design of low loading noble metal catalysts.

Cellulose was the most abundant biological molecule in nature, as a major component of plant cell wall. Nanocellulose isolated through disintegration of cellulose fibers could be used as an adsorbent for wastewater treatment due to its excellent properties. Owing to its high cellulose content and almost without lignin in the cell walls, Chlorella was a good raw material for preparing nanocellulose. In this study, Chlorella-residual based TEMPO-oxidized cellulose nanofibers (TCNF) were prepared through TEMPO-mediated oxidation processes under gentle mixing without high-energy mechanical treatments. The average diameter of TCNF is about 2 nm, whereas its average length was about 300 nm, and the carboxyl content is 1.54 mmol/g. Moreover, methylene blue (MB) was used as a model dye to measure the adsorption capacity of TCNF. The adsorption capacity is almost saturated when TCNF contacted MB for 80 min, and the adsorption kinetics coincide with the pseudo-secondary kinetics model. The adsorption of TCNF on MB is greatly affected by the pH value, with a maximum value at pH = 8. The initial concentration of MB considerably affects its adsorption on TCNF. Below the initial concentration of 10 mg/g, adsorption of TCNF considerably increases with the increase in the initial concentration of MB. And when the concentration is higher than 10 mg/L, the adsorption tends to be saturated. Based on the sorption isotherms analysis of TCNF, the Langmuir model fits best with the experimental data. Thus, TCNF surfaces are uniform and monolayer adsorption occurred. In conclusion, the preparation of TCNF from Chlorella-residual is a simple and promising scheme for the removal of cationic dyes from industrial wastewater.

Rechargeable zinc ion batteries (RZIBs) have gained significant attention due to their high safety, low cost, and environmental friendliness. However, the high reactivity of water in traditional aqueous electrolytes leads to the problems of dendrite formation and side reactions in the circulation process of zinc anode, which limits the development of RZIBs. These issues are effectively addressed by eutectic electrolytes through the regulation of the number of water molecules in the solvation structure of Zn²⁺ ions via hydrogen bonding and coordination effects. Additionally, eutectic electrolytes have the advantages of simple synthesis, non-corrosive, and environmental friendliness, which has attracted much attention in the field of RZIBs. The article begins by providing a brief introduction to the basic principles and definitions of eutectic electrolytes, and then highlights their current applications in RZIBs. Finally, the development prospects of eutectic electrolytes are discussed, offering important insights for the preparation of excellent eutectic electrolytes.

Metal organic frameworks (MOFs) are emerging porous materials connected through organic ligands, which have broad application prospects in gas storage, drug transportation, catalysis, and chemical sensing. This article provides an overview of the prediction and design of Fe based MOFs based on the combination of density functional theory (DFT) and machine learning (ML). It provided a detailed description of the main synthetic methods for Fe-based MOFs materials and pointed out the crystal structure and coordination environment characteristics of these materials. The synthesis methods of Fe-MOFs based composites were summarized by combining nano powders. The applications of Fe MOFs and their composite materials in electrocatalytic nitrogen fixation, adsorption, conductivity, catalysis, and other properties were summarized, and the shortcomings in the current development of Fe MOFs and their composite materials were shown. Finally, a summary and outlook on Fe based MOFs and their composite materials were presented.

Bone defects seriously threaten people's lives and health, and implantation of the bone repair material polyetheretherketone (PEEK) is an effective way to treat it. However, the infection caused by PEEK's lack of antibacterial activity impedes its wide clinical adoption. Therefore, BiOBr/Ti₃C₂ Mxene (hereinafter referred to as BTC) with sonodynamic properties were synthesized in this project, and its sonodynamic properties were verified by 1, 3-diphenylisobenzofuran (DPBF) consumption, Rhodamine B (RhB)consumption, and glutathione (GSH) consumption. And then we coated it on sulfonated PEEK to form SP@BTC materials. We employed Escherichia coli (E. coli) and Staphylococcus aureus (S. aureus) to represent Gram-negative and Gram-positive bacteria respectively to explore the antibacterial properties and mechanism of SP@BTC by spread plate method, bacterial reactive oxygen species (ROS) detection and bacterial morphology observation. The final results show that BTC has excellent sonodynamic performance, which in turn makes SP@BTC have excellent antibacterial properties. This study explores the application of BTC material in the field of sonodynamic, and provides new ideas for solving the problem of bacterial infection of PEEK.

In this paper, CoFe₂O₄/biomass carbon composites were prepared by one-pot hydrothermal and high-temperature calcination methods. The microscopic morphology, crystal structure and electromagnetic parameters of the material indicate that CoFe₂O₄ can be uniformly dispersed in the carbon base, and the presence of CoFe₂O₄ is conducive to the defective polarization of the biomass during the carbonization process, which is beneficial to the enhancement of the wave absorption properties of the material. Effective regulation of the electromagnetic parameters of the composite material by adjusting the content of CoFe₂O₄ to optimize its impedance matching performance. Experimental results show that the minimum reflection loss (reflection loss, RL) value of -48.0 dB and effective absorption bandwidth (effective absorption bandwidth, EAB) of 5.5 GHz were obtained at 2.0 mm thickness of CoFe₂O₄/C-3.0 composite.

With the continuous implementation of the “double carbon” policy and the continuous improvement of people's awareness of environmental protection, carbon monoxide (CO), as a typical air pollutant, has become the main control object of industrial and automobile exhaust emissions. Noble metal catalysts for CO oxidation are one of the most effective means for CO catalytic oxidation treatment due to their excellent low-temperature activity, anti poisoning and anti-corrosion properties. Based on the research status of noble metal type CO oxidation catalysts, this paper focuses on the noble metal regulation technology and carrier controllable technology of Pt, Pd, Au, Ag and Rh noble metal catalysts, summarizes the performance optimization ways and development directions of noble metal type CO oxidation catalysts, and provides guidance for the development of better performance CO oxidation catalysts.

Capturing water from air is an effective method to solve the current fresh water shortage crisis because of its low construction cost, ease of use and flexibility, as well as the abundance of fresh water resources in the atmosphere. The sorption-absorption method of AWH is the most promising method with stable efficiency and green features. Insufficient water sorption capacity and high desorption temperature of hygroscopic materials are the core problems which limit the wide application of air extraction technology. Covalent organic framework is a new porous crystalline material with large specific surface area and permanent porosity, which is achieved wide attention in the field of gas sorption and storage. The β-ketoenamine COFs:TpPa-1 with high crystallinity and good water stability are prepared by the solvothermal method. The specific surface area of TpPa-1 is 502 m²/g, and the pore size is distributed at 1.26 nm, which makes TpPa-1 have excellent water adsorption ability at low relative humidity. TpPa-1 exhibits an S-shaped sorption isotherm with a steep increase in water sorption capacity from 0.08 g/g to 0.27 g/g under 20%-30% RH. In the sorption kinetics test, TpPa-1 reaches the sorption equilibrium within 2 h at 15 ℃ and 30% RH. Meanwhile, TpPa-1 has a low desorption temperature and may reach 91% desorption efficiency under a standard sunlight (AM 1.5 G), indicating that TpPa-1 may fully drive the desorption process by sunlight irradiation without any energy input. Especially, TpPa-1 exhibits excellent cycling stability after 10 sorption-desorption cycles (1 400 min) under humid conditions (60% RH), and the water absorption rate only decreases by 1.48%. A simple AWH device is designed filling with TpPa-1, and AWH tests are conducted under simulated laboratory conditions. It is observed that 0.225 g/g fresh water may be collected in one cycle under 60% RH condition. This work implies that the porous TpPa-1 may provide a stable strategy for adsorption-assisted air collection with high efficiency and fast cycling.

In this paper, a flexible carbon cloth was used as the fluid collector of the composite electrode, and the high-conductivity carbon nanotubes (CNTs) were embedded into the polyvinylidiene fluoride (PVDF) binder by electrostatic flocking to obtain a composite structure with a larger electrochemically active surface area. Then, polyaniline (PANI) with pseudocapacitance characteristics was plated on the surface of CNTs by electrochemical deposition, and a binary composite electrode with carbon nanotubes/polyaniline (CNTs/ PANI) was obtained. The structure of the electrode material was characterized by scanning electron microscopy (SEM). The flexible solid-state supercapacitor (SSC) with symmetrical structure was assembled with polyvinyl alcohol (PVA) hydrogel electrolyte containing sulfuric acid, and its electrical performance was tested by electrochemical workstation. The results show that the SSC has a specific capacity of 517 mF/cm² at a current of 1 mA/cm². After 2500 cycles, it has a capacity retention rate of 79.8% and a Coulomb efficiency of more than 97%. The study shows that electrostatic flocking technology can be used as an effective way to prepare high performance electrode materials.

Graphene oxide (GO) has promising applications in improving the microstructure and mechanical properties of cementitious materials due to its excellent properties. However, the enhancement effect of GO is largely dependent on its dispersion in the cement matrix. This paper summarizes the research results of GO in cementitious materials in recent years, focusing on the review of GO dispersion methods, dispersion mechanisms, and the corresponding mechanical property improvement mechanisms, comparing the advantages and disadvantages of different GO dispersion methods, and analyzing the effects on the microstructure and mechanical properties of cementitious materials before and after GO dispersion. The problems of the current research are pointed out, and an outlook on future research trends is provided, aiming to provide a basis for subsequent GO in cementitious materials for stable applications, in order to promote the preparation of highly functionalized GO cementitious composite reinforced materials.

The expanded graphite-paraffin composite phase change energy storage material was prepared by vacuum impregnation method, with expanded graphite as the main thermal material and paraffin as the phase change heat storage material. The effect of paraffin mass fraction on the microstructure, phase structure, and thermal performance of composite phase change energy storage materials were studied. The results indicate that the composite phase change energy storage material generated by the reaction of expanded graphite and paraffin mainly relies on physical adsorption and binding, and paraffin evenly covers the surface and pores of expanded graphite. When the mass fraction of paraffin is 91%, the sealing and structural density of the composite phase change energy storage material are the best, with almost no leakage. As the mass fraction of paraffin increases, the melting point of composite phase change energy storage materials gradually increases, and the thermal decomposition temperature gradually increases. The thermal decomposition temperature of composite phase change energy storage materials with 91% paraffin mass fraction is about 15 ℃ higher than that of phase change materials with 85% paraffin mass fraction. As the mass fraction of paraffin increases, the thermal conductivity and thermal diffusion coefficient of composite phase change energy storage materials continue to decrease, the density first decreases and then increases, and the specific heat continues to increase. When the mass fraction of paraffin is 91%, the density of the composite phase change energy storage material is the minimum value of 0.794 g/cm³, corresponding to a specific heat of 5.462 J/(g·K). Analysis shows that the composite phase change energy storage material with a paraffin mass fraction of 91% has the best comprehensive performance.

Solid polymer electrolytes (SPEs) have received increasing attention due to their unique safety properties. In this paper, a novel SPE (PIL@PEO SPE) was prepared by introducing poly(ionic liquid) (PIL) using poly(ethylene oxide) (PEO) as the matrix. By interspersing PIL in PEO chain segments, the crystallinity of PEO was effectively reduced, and the ionic conductivity of SPE was improved (6.63×10^-4 S/cm). The solid-state battery prepared showed a high first discharge capacity of 147.6 mAh/g for Li/LiFePO₄ cells at 0.5C, 60 ℃, and the capacity retention remained above 90% after up to 300 turns of charge/discharge cycles.

The application of recycled carbon fibres and their composite materials have great economic value. The surface wettability of carbon fibres can be effectively improved after modifying of waterborne polyurethane sizing agent. Moreover, the interface integration situation between carbon fibres and thermoplastic resins can be further enhanced. The experimental results show that the surface modified recycled carbon fibre/ABS resin matrix composite exhibits good tensile strength and elastic modulus. This article aims to enrich the relevant research on recycled carbon fibre/thermoplastic resin composites, and provide references basis for the subsequent surface reconstruction of recycled carbon fibres and the preparation of thermoplastic composites. It is expected to promote the application of recycled carbon fibres in the industrial field.

With the development of electronic information technology, the application fields of microwaves are becoming increasingly widespread, while the electromagnetic radiation pollution has also become a global issue. Efficient microwave absorbing materials have become one of the effective ways to solve electromagnetic radiation pollution. Carbon-coated core-shell microwave absorbers can not only optimize the impedance matching characteristics, but also control the microwave absorption performance, which has become a research hotspot in the field of microwave absorption materials. This paper introduces the microwave absorbing mechanism of core-shell structure microwave absorbers, describes the preparation and microwave absorption performance of carbon-coated core-shell structure microwave absorbers with different structures compositions, discusses the reasons for improving the microwave absorption performance, and analyzes the advantages and disadvantages of various carbon-coated core-shell structure microwave absorbers. The development trend of core-shell microwave absorbers is prospected.

Due to the high theoretical capacity, Co₃O₄ has been regarded as one of the popular candidates for new anode materials in lithium-ion batteries recent years. However, the poor conductivity and cycling performance hinder its further development. In this work, Co₃O₄/C three-dimensional conductive networks with carbon nanotubes and graphene as conductive bridges and shells were prepared through carbonization and oxidation treatment using melamine and g-C₃N₄ as carbon sources and ZIF-8@ZIF-67 as self templates. The strategy of nanosizing particles and the evaporation and pore formation of zinc at high temperature result in the specific capacity of 1 139.7 mAh/g and 1 002.1 mAh/g after cycling for 200 and 800 cycles at current densities of 0.5 A/g and 2 A/g. Gradually increasing the current density of charging and discharging from 0.2 A/g to 10 A/g and then returning to 0.2 A/g, the material still reaches 94.9% of the initial capacity. This network structure exhibits superior cycling and rate performance compared to similar materials.

Nano graphite oxide (GO) was prepared by an improved Hummers method, and functionalized GO composites were prepared with ethylenediaminetetraacetic acid (EDTA) as modifier. The lattice structure, microstructure, and functional groups of functionalized GO composite materials were characterized by XRD, SEM, and FT-IR, and were used as adsorbents to test the effects of different pH values, initial concentrations and adsorption times on the adsorption performance of heavy metal wastewater containing Cd. The results showed that the surface of EDTA was rich in oxygen-containing groups such as hydroxyl and carboxyl groups. After grafting onto the GO surface, the number of active sites on the GO surface increased. Cd (Ⅱ) was adsorbed by the active sites on the functionalized GO composite material surface and deposited in the original grooves, making the surface of the composite material smooth. When the pH value was 6, the adsorption capacity and removal rate of functionalized GO composite materials for Cd containing heavy metal wastewater reached their maximum values, which were 45.8 mg/g and 95.3%, respectively. At an initial concentration of 120 mg/L, the adsorption capacity and removal rate reached their maximum values of 66.5 mg/g and 96.3%, respectively. When the adsorption time was 60 min, saturation adsorption could be achieved, and the adsorption capacity and removal rate reached the highest values, which were 78.0 mg/g and 98.5%, respectively. After 5 repeated uses, the adsorption capacity could be maintained at 23.8 mg/g, and the removal rate could be maintained at 85.4%, demonstrating excellent cycling performance.

With the rapid development of selective catalytic reduction by ammonia gas (NH₃-SCR) technology in industrial flue gas, it is of great significance to develop a catalyst for selective oxidation of escaping ammonia (NH₃-SCO) with matching temperature window. Based on the catalytic properties of Co and V metal oxides in the NH₃-SCO reaction, this paper attempts to prepare CoV composite oxide catalysts (CoV-MEC, CoV-IMP, CoV-LDO) by using different methods (mechanical assembly, impregnation, hydrotalcite-like template method) to assemble Co and V, and the effect of the synthesis way on the physical and chemical properties and the removal performance of escaping ammonia of the catalysts was systematically evaluated. The results show that CoV oxide catalysts derived from the hydrotalcite-like precursor had larger specific area, richer surface acid content and more suitable redox capacity, showing better N₂ selectivity compared with mechanical assembly and impregnation methods. It can better balance NH₃ oxidation performance and N₂ selectivity in the range of 150-360 ℃. NH₃ removal efficiency was nearly 100% and N₂ selectivity was kept at 70% at 360 ℃. Its excellent performance is related to the fact that NH₃ adsorbed on its surface can be rapidly oxidized to NO by O₂, and the reaction follows the i-SCR mechanism. This work can provide important reference for constructing CoV-based mixed oxides catalysts with excellent performance in applications for NH₃-SCO.

In order to ensure the normal operation and safety at work of electronic equipment, the research on thermal management of electronic components has continued increasing in recent years. Graphite film produced with polyimide (PI) as the substrate is an important thermal conductivity material, and its thermal conductivity can be improved through doping modification. Compared with solid thermal conductive filler, ionic liquid has better compatibility with polyimide matrix, and has been commonly used in gas separation membrane, colorless polyimide (CPI) and other applications. This article used 4, 4′-diaminobenzoylanilide (DABA) and 3, 3′, 4, 4′-biphenyltetracarboxylic dianhydride (BPDA) as monomers, and modified PI films by using 1-ethyl-3-methylimidazolium bis[(trifluoromethyl)sulfonyl]imide(IL) that had the characteristic of multiple hydrogen bond sites. Then, high thermal conductivity graphite film was prepared by graphitization. The research results show that when the IL content is 5.0 wt%, the grain size of the graphite film is 78.417 nm, the degree of graphitization reaches 88%, and the thermal conductivity reaches 770 W/mK, which is 1.53 times that of the pure PI cornerstone ink film.

Zirconia aerogel which characterized with excellent properties such as high specific surface area, strong adsorption performance, low thermal conductivity, etc. has broad application prospects in the fields of catalyst carrier, gas filter materials, efficient thermal insulation materials and so on. However,it exhibits poor mechanical properties due to the pore structure destruction and skeleton structure collapse caused by crystal transformation at high temperature, which limits their practical application. In this work, high strength zirconia foam ceramics were prepared by direct foaming method with high thermal stability zirconia aerogel and reinforced zirconia fiber. The results show that the prepared foam ceramics remained tetragonal after 5 hours treatment at 1 400 ℃, indicated good thermal stability at high temperature of foam ceramics. With 35% fiber content, the compressive strength of zirconia foam ceramics is 15.3 MPa. With 30% fiber content and m_H2O2:m_A-ZrO2=4∶8, the density of foam ceramics is the lowest, only 1.104 g/cm³, and the total porosity is 81.6%. The thermal conductivity of foam ceramics is 0.451 W/(K·m) at room temperature and 0.712 W/(K·m) for 1 000 ℃.

To improve the corrosion resistance of nickel matrix composites, in this paper, nano-TiO₂ particles were fully dispersed in the plating solution by ultrasonic wave, and Ni-TiO₂ composite coatings were prepared on liquid silica gel by using a DC stabilized power supply and a constant temperature heating magnetic stirrer. The properties of the composite materials were adjusted by changing the content of titanium dioxide. The surface morphology, elemental composition, grain size and corrosion resistance of Ni-TiO₂ composite coatings were examined using cold field emission scanning electron microscopy, X-ray photoelectron spectroscopy (XPS), X-ray diffractometer, and electrochemical studio. On the premise of conducting pretreatment on liquid silica gel, the Ni-TiO₂ composite coating was successfully prepared. The Ni-TiO₂ composite coating with different TiO₂ content had different properties, among which 3-Ti-Ni had the best performance, and the particle diameter of the coating was 5-40 μm. The particle spacing was 3-15 μm. The corrosion resistance of 3-Ti Ni composite coating was the strongest, the corrosion current density was 48.5% lower than that of 1-Ti Ni, and the grain size of 4-Ti Ni composite was 36% lower than that of 1-Ti Ni composite. The addition of nano TiO₂ particles can effectively improve the corrosion resistance of nickel based materials. The addition of nano TiO₂ particles in composite coatings can refine the grains, make the coatings more compact, and improve the corrosion resistance of materials. When the content of TiO₂ reached 22 g/L, the corrosion resistance of the composite is the best.

With the development of the power system, the power of its main electrical control equipment circuit breakers continues to increase. As the core component of circuit breakers, the research on electrical contact materials has received increasing attention. In this paper, Cu powder, Cr powder and graphene are used as raw materials. Graphene was added by mechanical mixing and chemical vapor deposition respectively. Graphene reinforced CuCr contacts were made by pressing-sintering-repressing-resintering process. The effects of different processes on the microstructure and properties of CuCr contacts were studied. It is found that the graphene added by chemical vapor deposition is evenly distributed in the matrix. The conductivity is increased to 40.64 MS/s, the average arcing time is 5.37 ms, and the welding force ranges from 13.550 to 13.636 N. The conductivity, welding resistance and ablation resistance have been significantly improved, which is beneficial to further expand its application range in the field of electrical contact materials.

Two types of solid waste, carbide slag and fly ash, were used as the main raw materials to prepare solid waste cementitious powders with different fly ash dosages.The influence of fly ash doping ratio on the hydration process,microstructure, failure morphology, and mechanical properties of cementitious powder was studied.The results showed that the addition of an appropriate amount of fly ash accelerated the consumption of cement clinker and increased the hydration reaction rate of the cementitious powder. At the age of 28 d, when the content of fly ash was 30wt%, the number of pores in the cementitious powder was the least and the structural density was the highest.The failure morphology of the cementitious powder during the stress process was similar, and the cracks were strip cracks from top to bottom, and there was a collapse phenomenon in the upper part.As the doping amount of fly ash increased, the setting time of the cementitious powder gradually increased, the fluidity and chemically bound water content continue to decreased, and the compressive strength and maximum stress changes first increased and then decreased.At the age of 28 d, when the doping amount of fly ash was 30wt%, the maximum compressive strength of the cementitious powder was 14.85 MPa, and the maximum stress at the same strain was 15.70 MPa.Analysis shows that the optimal doping amount of fly ash is 30wt%.

Properties of physical and chemical for lanthanum cerium fluoride polishing powder were characterized by techniques of X-ray diffraction, scanning electron microscopy. Space structures were calculated by the inorganic crystal structure database (ICSD), and wettability and polishing performance was done using contact angle measuring equipment and surface defect detector. It was found that the materials are all made up of agglomerated near-spherical particles. Below 800 ℃, the product is a mixture of cubic CeO₂ and trigonal LaF₃, while above 800 ℃, it is a mixture of cubic CeO₂ and tetragonal LaOF. When the calcination temperature is 850 ℃, the polishing properties of the products is the best.