micro-nano laminated ribbon-shaped PAN nascent fibers were prepared by a new micro-nano laminated extrusion technique using polyacrylonitrile (PAN) and dimethyl sulfoxide (DMSO) as raw materials.The properties of the nascent fibers were characterized by means of scanning electron microscopy (SEM),X-ray diffraction (XRD),and electrical testing machine.The effects of air layer height,coagulation bath temperature and coagulation bath concentration on the performance of the micro-nano laminated ribbon-shaped PAN nascent fibers were studied.It was found that the laminated ribbon-shaped PAN nascent fibers could maintain a good ribbon-shaped cross-section without deformation during the spinning process compared with the conventional circular cross-section fibers.Under the conditions of an air layer height of 30mm,coagulation bath temperature of 45℃and coagulation bath concentration of 40%,the prepared laminated ribbon-shaped PAN nascent fibers exhibited a better overall performance,with a crystallinity of 31.3%,a grain size of 4.53nm and a tensile strength of 14.6MPa.

Spinel-type lithium nickel manganese oxide has become one of the hot spots in the research of lithium-ion battery cathode materials in recent years due to its advantages of high working voltage,high safety,and low cost.However,it has the disadvantages of structural failure and fast decay of cycling performance caused by Mn dissolution.This paper focused on the research progress on improving the structural stability and cycling performance of lithium nickel manganese oxide materials by modification methods such as crystal structure control,ion doping and surface coating.Finally,the focus and development trend of lithium nickel manganese oxide materials in the future were prospected.

Supercapacitors have received widespread attention in the energy storage industry due to their smaller volume,faster charge-discharge process and longer cycle life than traditional capacitors.Supercapacitor is an advanced energy storage device,which uses the double-layer charge distribution between the electrode and the electrolyte to store energy.It has the advantages of pollution-free and sustainable development.Among them,the most familiar graphene materials are the most widely used and play an important role.This paper summarized the history and manufacturing technology of graphene,and reviewed and prospected the application of graphene and other materials in supercapacitors in recent years.

This article systematically reviewed the research progress of Al/PTFE composite materials.In terms of the dynamic mechanical properties of composite materials,the larger the strain rate,the higher the material strength.The increase in Al content in composite materials results in an increase in elastic modulus and yield strength.As the temperature increases,the toughness of the composite material increases,but the dynamic compressive strength decreases.Iron powder,nickel powder,tungsten powder,copper oxide,titanium hydride,zirconium hydride,etc.can improve the compressive strength of Al/PTFE composites.Regarding the thermal performance of composite materials,the heat release of Al/n-PTFE is much higher than that of other aluminothermic agents,and the reactivity between nanoscale aluminum powder and PTFE is better than that of microscale aluminum powder.For ignition and combustion performance of composite materials,when the mass content of PTFE in the composite material is about 35%,the composite material exhibits the highest combustion pressure,the shortest combustion time,and the highest center flame temperature.Composite material samples with confined hollow structures burn better than samples with solid,hollow,and core-shell structures.Titanium hydride,ammonium perchlorate,and carbon nanotubes have a certain combustion supporting effect.As far as the impact response performance of composite materials,the higher the loading strain rate,the smaller the reaction delay time of the material,and the more intense the reaction.Moreover,the reactivity and degree of reaction of nanoscale aluminum powder are better than those of micrometer scale aluminum powder.Adding oxides (bismuth trioxide,copper oxide,molybdenum trioxide,and iron trioxide) can adjust the energy release characteristics of materials.In light of the reaction completeness of composite materials,the higher the launching rate of materials as projectiles,the more complete the reaction.The aluminum content has a very significant effect on the completeness of the reaction.Copper oxide can improve the completeness of the reaction.As for the application scenarios of composite materials,the damage effect of materials on target plates,arson ability,improvement of propellant mechanical properties and combustion efficiency,and the protective effect as protective materials have significantly improved compared to traditional materials.The research results of this article are expected to be an important reference for practitioners in the explosive and warhead industries.

Phase change material (PCM) is a kind of reversible energy storage material and can cyclically store energy in the form of latent heat of phase change to achieve energy saving effect in practical use.The organic-based phase change materials (OPCMs) with medium and low phase change temperatures were discussed,and they exhibited long-term chemical stability,non-pollution,energy saving,high efficiency,non-toxic and non-corrosive properties.The latest research progress on the preparation methods and encapsulation technologies of OPCMS at home and abroad were reviewed.According to the characteristics of materials,the methods of reducing flammability and the latest applications in various fields were introduced.

With the rise of the new energy industry represented by lithium-ion batteries,the demand for lithium has increased dramatically,so the technology of lithium extraction from salt lake brine has received widespread attention.The lithium extraction technology from salt lake brine using lithium ion sieves as adsorbents is environmentally friendly,efficient and sustainable.This paper introduced the types of lithium extraction technology from salt lake brine,reviewed the synthesis methods of titanium-based lithium-ion sieves and the research progress of titanium-based lithium-ion sieve nanomaterials,and compared the advantages and disadvantages of different titanium-based lithium-ion sieve synthesis methods.Finally,it looked forward to the research direction of titanium-based lithium-ion sieves.

With development and progress of science and technology,the demand for multifunctional epoxy resin composites is increasing.Due to its unique structure and various excellent properties,hexagonal boron nitride can be added as a filler to epoxy resin matrix to improve the thermal conductivity,flame retardancy,anti-corrosion and other properties of composites,and it is one of the multifunctional fillers with broad application prospects.In order to improve the dispersibility of hexagonal boron nitride and its compatibility with epoxy resin,it is often necessary to modify hexagonal boron nitride.Research progress of modified hexagonal boron nitride/epoxy resin composites in terms of thermal conductivity,flame retardancy,corrosion resistance,etc.was reviewed,and the development trend of modified hexagonal boron nitride/epoxy resin composites was prospected.

Silicone materials are widely used in the field of electronics because of their excellent flexibility,chemical resistance,insulation,low viscosity and temperature resistance,but their lower thermal conductivity hinder their own application and development.Therefore,the development of high heat-conducting organic silicon materials is a challenge.This article introduced the thermal conductivity mechanism of organic silicon composite material,types of heat conduction filler,focusing on the methods and means to improve the thermal conductivity of thermal conductivity composite materials at home and abroad,summarized and looked forward to the dilemma and research key directions of high thermal conductivity organic silicon materials,offering insights and references for the further research of high thermal conductivity organic silicon materials.

With the increasing demand for clean energy and renewable energy,research and development of new energy storage materials are imminent.Sodium-ion batteries are expected to be the most promising energy storage component after lithium-ion batteries in the field of large-scale energy storage due to their abundant sodium resources and low cost.Since the preparation methods of sodium-ion battery cathode materials had an important influence on the electrochemical performance of the materials,we briefly introduced several common synthesis methods for sodium-ion battery cathode materials in recent years,mainly including high temperature solid-phase method,hydrothermal method,co-precipitation method,sol-gel method,etc.We reviewed the advantages and disadvantages of different synthesis methods for common sodium-ion battery cathode materials,and analyzed and prospected the future synthesis methods of sodium-ion battery cathode materials.

Study on the materials,preparation techniques,and performance of lithium-ion battery separators can better understand the working principles of lithium-ion battery separators.Firstly,the development status of lithium-ion batteries and the research on their separators were reviewed.Secondly,the research status of separator materials for lithium-ion batteries was introduced in detail,including polymer electrolyte membranes,ceramic electrolyte membranes,and metal electrolyte membranes.Next,the preparation technology of separator was introduced,including coating method,sol-gel method,and in-situ growth.Finally,the electrochemical performance of lithium-ion battery separators was described,including research on conductivity,compressive strength,and thermal stability.

Latent heat thermal energy storage (LHTES) technology is viewed as an effective measure to alleviate the contradiction between energy supply and demand.It uses phase change materials (PCMs) to absorb/release heat during phase change process to achieve energy storage and release.This technology has great application potential in building energy conservation,greenhouse temperature control and temperature-adjustable clothing.In this paper,the types and characteristics of shaped-stabilized PCMs (SSPCM) were summarized.The preparation methods and thermal storage properties of porous-based SSPCM,microencapsulated SSPCM and polymer-based SSPCM were reviewed.In the meanwhile,the problems in the preparation process of SSPCM were analyzed,and the methods of enhancing heat transfer were introduced.Finally,the focus of future research work was discussed and the development prospects of SSPCM in the future were pointed out.

Ceramizable phenolic resin composite is a new type of heat-resistant material composed of phenolic resin matrix,ceramic-forming fillers,fluxing agents,and other additives.This kind of material can form a ceramic layer at high temperature,which plays a role in blocking oxygen and heat,and improving the heat resistance of the material.The article reviewed the main fillers and heat resistance modification of ceramizable phenolic resin composites,and discussed the future prospects of ceramizable phenolic resin composites.

With extremely high theoretical capacity,low voltage platform and abundant natural resources,silicon is one of the most potential anode materials for the next-generation of high-energy density lithium-ion batteries.However,due to its low conductivity and large volume change during the cycle,it is difficult to be used as anode material directly.Silicon-carbon composites combine the high specific capacity of silicon with the high conductivity of carbon while ensuring the structural integrity of the electrodes.In this paper,the research progress of silicon-based anode materials in recent years was reviewed from the aspects of dimension structure,composite materials and application performance,the problems faced by silicon-based materials were summarized briefly,and the research prospect of their use as anode for lithium-ion batteries was discussed.

Metal organic frameworks (MOFs) materials have gained increasing attention in the field of membrane technology.The highly ordered and adjustable sub-nanometer-sized pores,high porosity and functionalization flexibility endow MOFs membranes with great application potential for efficient ion separation.The selective ion transport behaviors in MOFs polycrystalline membranes,MOFs mixed matrix membranes and MOFs channel membranes have been successively reported.Based on the structure-property relationship of MOFs materials,significant progress has been made in optimizing the selectivity and stability of membrane through controlled design.In this review,the fabrication,selective ion separation mechanisms and optimization strategies of MOFs membranes were systematically reviewed.Their typical characteristics and the challenges faced in the practical applications were comparatively analyzed.Based on this,the potential research directions of MOFs membranes in the field of ion separation were proposed.

As the “reinforcing framework” of composite materials,preforms have an important impact on the performance of composite materials.The needle punching process has gradually become the mainstream technology for the preparation of preforms because of its advantages of simplicity,speed and low cost.In order to gain an in-depth understanding of the research situation on needle punching technology,needle-punched preforms and needle-punched composites.This paper introduced the overview of needle punching technology,discussed the research progress of needle punching process parameters,needle-punched preform types,experimental research and theoretical modeling of needle-punched composites,and analyzed the future development direction of needle punching technology.

Inorganic solid electrolytes have the advantages of high safety and high electrochemical window,and have great application potential in solid-state lithium-ion batteries.In this paper,the characteristics and properties of inorganic oxide solid electrolytes were introduced,the research progress on the preparation and modification of inorganic oxide solid electrolytes was reviewed,and the doping modification,coating modification,and composite modification methods of inorganic oxide solid electrolytes were emphasized.Finally,the summary and prospect were made.

The shortage of freshwater resources has become a prominent problem faced by mankind,but the traditional water treatment technology has the problems of high cost,high energy consumption and low efficiency.Due to the green and sustainable characteristics of solar energy,the application of interfacial solar evaporators composed of aerogel materials for seawater desalination,sewage and wastewater treatment has attracted great attention.In the process of interfacial solar photothermal evaporation for water treatment,the efficiency of water treatment is closely related to the absorption and utilization of solar energy,water transport channel and heat management,especially the absorption and utilization of solar energy.This paper briefly summarized the application and research progress of organic aerogel materials in interfacial solar photothermal evaporation technology,including the types of photothermal materials used in organic aerogel materials and the introduction of the conversion mechanism of the photothermal conversion materials,and focusing on the research and applications of organic aerogel materials loaded with different photothermal materials in interfacial solar photothermal evaporation for water treatment.The development trend of organic aerogel materials in interfacial solar photothermal evaporation for water treatment was also prospected.

The preparation of composite materials by efficient extraction,treatment and use of natural biomass materials is one of the key research contents in the field of material research and development.Camellia oleifera shell is an accessory product of camellia oleifera fruit,which has a large amount of output every year with the harvest of camellia oleifera fruit,and has potential value as a raw material of biomass composite materials.In this paper,camellia oleifera shell materials were introduced,and the relevant research and application status of camellia oleifera shell in cellulose extraction,direct preparation of wood-plastic composite materials and preparation of biomass carbon composite materials were described in detail,aiming to provide certain guidance for the high-value utilization of abundant camellia oleifera shell materials.

Inverse vulcanization is an effective method for synthesizing high-sulfur polymers using elemental sulfur as the reactant and small molecule unsaturated olefins as cross-linking agents.As a type of organic-inorganic hybrid polymer material,inverse-vulcanized polymers exhibit characteristics that are distinct from carbon-based materials.This article provided a detailed introduction to the features and experimental synthesis of inverse-vulcanized polymers,along with their applications in areas such as lithium-sulfur batteries,heavy metal adsorbents,optics,self-healing materials,antibacterial agents,and oil spill adsorbents.The study also offered a prospective outlook on the future development of inverse-vulcanized polymer materials.

New chemical materials refer to materials characterized by novel structures,innovative preparation methods,improved performance metrics,and expanded application domains,developed through chemical research,synthesis,and utilization.As a cornerstone of the national economy,new chemical materials constitute a critical foundation for technological progress.In recent years,China's new chemical materials industry has undergone rapid advancement,particularly in areas such as energy storage materials,photoelectric conversion materials,photocatalytic materials,electronic materials,high-performance resins and fiber materials for advanced composites,as well as functional coatings and adhesives.These materials have played a pivotal role in driving development across multiple sectors,including wind power,photovoltaics,new energy vehicles,aerospace,and semiconductor packaging and testing,thereby fostering the emergence of high-quality productivity.To systematically document and disseminate these advancements,the New Chemical Materials Professional Committee of the CIESC will organize leading experts and scholars to compile an annual report on scientific and technological progress of new chemical materials of the year.This report will be published in the journal New Chemical Materials,providing a comprehensive resource for researchers and practitioners.

Fiber-reinforced polymer-based composites have been widely used in many industries for their excellent mechanical properties.However,it is difficult to analyze the integrity and durability of fiber-reinforced polymer-based composites due to their own structural characteristics as well as the complexity of the environment and loading conditions they are subjected to.The use of structural health monitoring (SHM) techniques to monitor the structural condition of composites improves the safety and reliability of composite structures and has been widely used in many industries.This paper reviewed the SHM methods and their applications for fiber-reinforced polymer-based composites based on electrical resistance sensing,and gave an outlook on the development of SHM for fiber-reinforced polymer-based composites.

Bacteria are a major cause of chronic infectious diseases and infections.Using antibiotics is the most commonly used method to kill bacteria and eliminate infection,but the abuse and misuse of antibiotics have led to increasing drug-resistance bacteria.In addition,the existing drug delivery methods often make it difficult for drugs to reach the action site,resulting in a waste of drug efficacy.Among various strategies to address the antibacterial dilemma,antibacterial nanomaterials have become a widely recognized emerging method.Zeolite imidazole ester skeleton material-8 (ZIF-8) is a metal-organic skeleton material that can grow drugs at connecting nodes,and has become one of the extensively studied antibacterial methods due to its good biocompatibility,structural stability,pH-responsive property,targeted drug delivery,and the ability to reduce the emergence of bacterial drug resistance.At the same time,a large number of studies found that ZIF-8 is favorable for maintaining drug activity and has a potential for clinical antibacterial applications.Therefore,this paper reviewed the antibacterial mechanism,applications and research progress of ZIF-8 in the antibacterial field.It also summarized the challenges and prospects for future development in this field.

A photothermal dual-responsive shape memory polyurethane/carbon black (SMPU/CB) nanocomposite was prepared by solution polymerization using polycaprolactone as the prepolymer,and CB nanoparticles as photo-responsive functional fillers.The structure,morphology,thermal properties and shape memory properties of SMPU/CB nanocomposite were characterized by IR,SEM,DSC and DMA.The results showed that SMPU/CB nanocomposite exhibited excellent shape memory properties,with shape fixity ratio and shape recovery ratio above 97%.In addition,due to the photothermal effect of CB,SMPU/CB nanocomposite had fast response speed and large bending deformation angle under infrared light irradiation,suggesting potential application prospects in aerospace,intelligent drive and other fields.

Nanocellulose,a new type of biobased naturally functional nanomaterials,has a broad range of application prospects in composite materials,packaging,pharmaceutical materials,coatings,cosmetics,electronic materials,and so on.However,nanocellulose still faces some major challenges in its preparation process,such as high energy and water consumption,thereby leading to high production cost.Additionally,traditional nanocellulose preparation methods are usually carried out under lower cellulose concentration conditions (less than 5%),which results in low production efficiency per unit volume and high content of water in the final products.This poses significant difficulties and challenges for transportation,storage,and applications,limiting its market promotion and practical application.Therefore,the development of high-consistency preparation techniques of nanocellulose has attracted growing attention,as it may help address issues such as high energy/water consumption,potentially further reducing production and application cost.

Porous organic polymer (POPs) membrane materials with intrinsic porous structure,adjustable pore environment and functional groups,are widely used in the field of molecular sieving.However,their efficient and controllable preparation methods remain a major challenge.Herein,the design and construction of different POPs-based membrane materials in recent years were sorted out around the interfacial polymerization method.Their applications in the fields of seawater desalination,dye separation,gas separation and photovoltaics were systematically summarized.Finally,the future development of POPs membranes preparation based on interfacial polymerization was analyzed and prospected.

Anode material is one of the key factors to improve the electrochemical performance of lithium/sodium ion batteries.FeS₂ has attracted wide attention due to its theoretical capacity of 890mAh·g^-1 and low cost,but its high volume expansion rate and poor conductivity during the charge-discharge cycle hinder its use as an anode material.Recombination and nanostructure design are the effective ways to solve the above problems.This paper reviewed the research progress of FeS₂-based composite materials used as anode materials of lithium/sodium ion battery,and discussed its development trend.

As an important industrial fiber,the properties of nylon 66 industrial filament are affected by a number of factors during the production process.The article firstly gave an overview of the characteristics and application scope of nylon 66 fiber,then introduced the molecular structure features,condensed state structure features and properties of nylon 66,and then expounded on the production process and apparatus of nylon 66 industrial filament,including the two processes of continuous polycondensation direct spinning and batch polycondensation solid-state polycondensation spinning.The article emphasized on the key factors affecting the production of nylon 66 industrial filament and action rules,including the molecular weight of nylon 66 polymer,chip moisture content and extractable content,spinning box temperature,spinning component filter material and filter screen,side blowing air cooling process,wetting,oiling process,spinning speed,winding process,drawing process,network degree,spinning environmental conditions,etc.,and provided the optimal range of process parameters.Finally,the article summarized the development prospects and market potential of nylon 66 fiber in China.

With the widespread popularity of wireless communication equipment and the rapid development of 5G technology,various electronic products bring great convenience to human production and life,but also bring serious electromagnetic pollution.Therefore,the development of materials with highly efficient electromagnetic interference (EMI) shielding performance has become a research hotspot.Fiber-reinforced epoxy-based EMI shielding composites are composites with good EMI shielding properties prepared by dispersing fibers or functional fillers with high electrical conductivity and magnetic permeability in the epoxy resin matrix.Because of its advantages of high strength,low density and good processability,it has broad application prospects in the fields of communication,rail transit and aerospace.This paper reviewed the research and application status of fiber-reinforced epoxy-based composites with excellent EMI shielding performance and provided an outlook on their future development prospects.

SBS-based flexible strain sensors have come into the public's view in recent decades because of their excellent mechanical properties and good sensing performance.The signal sensing mechanism of strain sensors was introduced,the preparation process of SBS-based flexible strain sensors and the sensing mechanism of different carbon nanomaterials were summarized,and the application of composites composed of SBS-based matrix and different carbon nanomaterials was envisioned.

In nature,many organisms show strong antifreeze capacity and can survive in extremely cold environments.Inspired by these biological antifreeze properties,researchers have developed a number of advanced antifreeze hydrogel materials and explored their potential applications in diverse fields such as flexible electronics,flexible energy,and bioscience.Based on the basic mechanism of antifreeze of cold-resistant organisms,two kinds of strategies for synthesis of antifreeze hydrogels to inhibit the formation of ice nuclei and the growth of ice crystals were summarized:one was to introduce organic solvents,acids,zwitterion,salts and other methods to inhibit the formation of ice nucleation;the other was to introduce antifreeze proteins (AFP),construct core-shell nanostructures,and polymer interpenetrating network structures (IPNs) to inhibit ice crystal growth.The advantages and disadvantages of each strategy were briefly introduced,and the relationship between the synthetic strategy and the properties of the obtained hydrogels was discussed.Finally,the future development direction of antifreeze hydrogels was proposed.

Using polyvinyl alcohol and chitosan as raw materials,by employing a freeze-thaw cycle method and adjusting the ratio of polyvinyl alcohol and chitosan,the number of freeze-thaw cycles and the stirring time,a series of composite hydrogels were prepared by orthogonal experimental design.The comprehensive performance evaluation was conducted.The results showed that the composite hydrogel prepared by mixing and stirring 15wt.% polyvinyl alcohol and 1.5wt.% chitosan for 4 hours,and undergoing 5 freeze-thaw cycles had strong tensile strength,appropriate water content and swelling rate,good blood compatibility,non-toxicity to cells,and was suitable for cell growth,making it a promising tissue engineering material for cartilage repair.

As the complexity of separation systems increases and the requirements for membrane separation performance improve,positively charged membrane separation technology plays an increasingly important role.This paper introduced the preparation method of positively charged membrane,reviewed the application progress of positively charged membrane in textile and dyeing wastewater,magnesium/lithium separation,heavy metal removal and biomedicine,discussed the main problems of positively charged membrane,and briefly prospected the future development direction of positively charged membrane separation technology.With the deepening of the research and the increase of market demand,the positively charged membrane will usher in a greater space for development and play a more important role in solving the shortage of water resources and water environment pollution.

The surface of Al₂O₃ microspheres was modified by octaaminophenyl sesquioxane (OA-POSS) and,and then the modified Al₂O₃ was homogeneously dispersed in colorless transparent polyimide (CPI) films prepared with hydrogenated homophthalic dianhydride (HPMDA),hexafluorodianhydride (6FDA),and 4,4′-diaminodiphenyl ether (ODA) monomers.The composite films were characterized by infrared spectroscopy,UV-Vis spectrophotometer,thermal conductivity tester,and thermogravimetric analyzer.The results showed that the transparent composite films maintained good mechanical properties (tensile strength above 92MPa) while still exhibiting high light transmission (above 82%) in the visible region.Moreover,the thermal stability and thermal conductivity of the transparent composite films were improved significantly at the low load of Al₂O₃.The prepared transparent composite films might be used as substrate materials for flexible display devices as well as electronic packaging materials.

The “layer by layer” Janus-PAN nanofiber membrane was prepared by continuous electrospinning.The Janus-PAN nanofiber membrane was composed of hydrophilic polyacrylonitrile (PAN) nanofiber membrane as the bottom layer,polyacrylonitrile/polyurethane (PAN/PU) blended nanofiber membrane as the middle layer,and hydrophobically modified SiO₂ nanoparticles as the top layer.The surface morphology,chemical composition,surface wettability and mechanical properties of Janus-PAN nanofiber membranes were analyzed and tested by field emission scanning electron microscope,Fourier transform infrared spectrometer,contact angle measuring instrument and electronic single fiber strength instrument.The oil-water separation and recycling properties of the Janus-PAN nanofiber membrane were investigated.The results showed that Janus-PAN nanofiber membrane had asymmetric wettability and could effectively switch between water-in-oil emulsion and oil-in-water emulsion,and still had high separation efficiency after 8 cycles of separation experiments.In addition,the separation efficiency of petroleum ether in water and engine oil in water emulsion could exceed 99.2% and 99.0%,respectively.The separation efficiency of water in peanut oil and water in paraffin oil emulsion could reach over 97.3% and 98.6%.

Based on the application potential of chitosan nanocomposite antibacterial materials in food packaging,the preparation methods of chitosan film materials were introduced,and the research progress of composite antibacterial materials prepared by compositing chitosan with nanomaterials such as Ag nanoparticles,MgO,ZnO,TiO₂,SiO₂,CaCO₃ was reviewed,pointing out that chitosan was a good food packaging material.However,chitosan composite film still had drawbacks such as low mechanical strength,poor barrier performance,weak oxidation resistance and poor water solubility.The solution casting method is one of the simple and most widely used methods for preparing chitosan-based films.The chitosan composite films prepared by layer extrusion method have good mechanical properties and thermal stability.Compared with pure chitosan films,the composite films prepared by chitosan with nanomaterials have better antibacterial properties.In the future,the research on the safety and preparation methods of chitosan nanocomposite antibacterial materials for food packaging should be strengthened to promote the large-scale production of chitosan nanocomposite materials and their application in food packaging.

Graphene has a unique two-dimensional sheet structure and exhibits excellent chemical inertness and impermeability.Both graphene films and graphene organic polymers demonstrate outstanding corrosion resistance and can be used as new anti-corrosion materials for marine metal equipment.In this paper,the anti-corrosion mechanisms of graphene films and graphene/polymers were reviewed.Specifically,the research progress of the preparation methods and applications of graphene films and graphene/polymers in anti-corrosion coatings for metal surfaces were highlighted.Finally,the prospects for the future application of graphene in anti-corrosion coatings were presented.

Advanced oxidation systems with persulfates (SR-AOPs) are effective in the removal of micropollutants (MPs),but they have high requirements for catalysts.Carbonaceous materials (CMs) have unique physicochemical properties and can be used as novel catalysts for SR-AOPs systems.This paper reviewed the preparation methods of biochar (BC),graphene-based materials (GBMs) and carbon nanotubes (CNTs),as well as the reaction mechanisms for the catalytic oxidation of their synergistic SR-AOPs systems and the study on the removal of MPs.Heteroatom doping and the introduction of oxygen-containing functional groups are the main means to improve the catalytic performance of GBMs and CNTs,and precise control of the structure of the hybrid materials at the nanoscale can lead to performance optimization.The introduction of membrane technology,electrochemical technology and photocatalytic technology in CMs/SR-AOP are expected to advance the development of water purification technology.

In recent years,Mxene has garnered significant interest for its exceptional properties including high conductivity,elevated ion migration rate,and appropriate bandgap,which has led to its widespread applications in various fields.In the field of photocatalysis,Mxene can be used as an excellent cocatalyst to greatly enhance the performance of photocatalysts.This paper introduced the main synthesis techniques and hydrogen production mechanisms of Mxene,focusing on its advancement in the field of photocatalytic hydrogen production,and made a prospect for the future development of Mxene materials in the field of photocatalysis.

With the rapid development of communication technology in civil and military fields,the waste electromagnetic radiation pollution caused by electromagnetic wave has become particularly prominent.In order to solve the negative impact of electromagnetic pollution on the human living environment,it is urgent to find a new kind of absorbing material that is lightweight,has high absorption performance,and possesses a wide absorption frequency band.Traditional single absorbing materials have narrow absorption frequency band and weak absorption performance.However,good impedance matching can be achieved by combining magnetic loss material with dielectric loss material.The basic principle of electromagnetic absorption was described,and the research progress and development prospect of several common new composite absorbing materials at home and abroad were introduced.The synthesis methods,structures,advantages and disadvantages and properties of new materials such as conductive polymer composite absorbing materials,biomass-derived carbon-based composite absorbing materials and magnetic metal composite absorbing materials were summarized,providing a reference for the development of high efficiency wideband absorbing materials with strong absorption performance,wide absorption frequency band,thin thickness and lightweight.

Conventional rigid sensors are severely limited in their applications due to problems such as difficulty in integrating them into flexible electronics and inability to adapt to complex deformation environments.The preparation of flexible sensors based on human perception is one of the effective solutions to these problems.The working mechanisms of piezoresistive,capacitive and piezoelectric flexible pressure sensors were summarized.It focused on the current research status of ionic flexible pressure sensors from the perspective of the ionic active materials used in the sensing layer and microstructural design.Furthermore,it reviewed the applications of ionic flexible pressure sensors in the fields of electronic skin,healthcare and motion detection.