Molecular company

Molecular company

Graphite Valley Industrial Group
Strong feelings of rice dumplings warm people's hearts, graphite valley for all employees to distribute Dragon Boat Festival benefits!

Strong feelings of rice dumplings warm people's hearts, graphite valley for all employees to distribute Dragon Boat Festival benefits!

As the Dragon Boat Festival is approaching, in order to thank all employees for their hard work for the company's development, on May 31, Graphite Valley issued Dragon Boat Festival benefits to all employees, making employees deeply feel the care and warmth of the Graphite Valley family. Welfare distribution site, we cooperate with each other, carrying, distribution, distribution...... the scene from time to time bursts of laughter, everywhere is permeated with the atmosphere of joy. Colleagues from various departments went to the scene to collect the zongzi gift box in an orderly manner. Boxes of Duanyang gift boxes full of the company's care and blessings "rushed" to various positions and passed on to every employee. The company was permeated with a warm and harmonious festive atmosphere. A zongzi, a care, zongzi brings not only the enjoyment of taste, but also a good blessing! The joy of the employees who received the welfare was beyond words. They all said that although the zongzi is small and affectionate, it not only allows everyone to feel the festive atmosphere in advance, but also integrates the company's strong care into the wisps of zongzi. Over the years, Graphite Valley has always attached great importance to the humanistic care for employees. Every traditional festival, it will distribute intimate and affordable welfare items to employees, so that employees can share the development achievements of the enterprise, which not only reflects the "people-oriented" corporate culture of Graphite Valley, but also enhances the cohesion of the team, improves the sense of ownership of employees, and adds impetus to the development of the enterprise.

Strong feelings of rice dumplings warm people's hearts, graphite valley for all employees to distribute Dragon Boat Festival benefits!
Warmly congratulate Comrade "Chen Longqing" on winning the honorary title of "Innovation Expert" in the second session of Harbin New District

Warmly congratulate Comrade "Chen Longqing" on winning the honorary title of "Innovation Expert" in the second session of Harbin New District

On May 31, the first Songbei District (Harbin New District) Model Worker, Model Unit (Collective) and the second New District Craftsmen, New District Innovation Expert Commendation Conference were held in Harbin. The majority of employees in the new district jointly witnessed the first Songbei District (Harbin New District) The highlight moment of the first model worker, model unit (collective), the second new district craftsman, and the new district innovation expert. In order to encourage the majority of employees in the new area to carry forward the spirit of craftsmanship, enhance their sense of innovation, and give full play to the wisdom and strength of industrial workers in the construction and development of the new area, the Songbei District Federation of Trade Unions organized the first selection of model workers and model units (collectives), The District Civil Affairs and Human and Social Resources Security Bureau jointly carried out the second selection and recommend of craftsmen and innovators in the new district. Through grassroots recommend, expert review, comprehensive assessment and publicity, and after discussion and approval by the Standing Committee of the District Committee, 30 model workers, 10 advanced units (collectives), 10 new district craftsmen and 10 innovative experts were commended and rewarded. Comrade Chen Longqing of our company won the honorary title of "the second innovation expert of Harbin New area" by virtue of his outstanding achievements in "process innovation, equipment transformation and technical improvement. As an innovative high-tech industrial group focusing on the fields of new energy and new materials, focusing on the R & D, production and sales of graphite, graphene, carbon materials and their applications, since its establishment, it has been based on scientific development and focused on independent innovation. Adhering to the innovative concept of "science and technology changes the world, innovation leads the future", and constantly pursues technology, product, service and management innovation; in the future, Graphite Valley will build and build a complete ecological block chain of graphite (ene) new material industry through industrial layout, scientific innovation, and combined with the capital market, promote industry development, give full play to Longjiang's advantages, create industrial highlands, grasp development opportunities, and adhere to Innovation leads, determined to become a leader in the new energy and new materials industry, to promote the rapid and healthy development of strategic emerging industries, and to contribute to the sustainable economic and social development.

Warmly congratulate Comrade "Chen Longqing" on winning the honorary title of "Innovation Expert" in the second session of Harbin New District
Bertrand Grasps Policy Dongfeng to Conquer Key Technologies

Bertrand Grasps Policy Dongfeng to Conquer Key Technologies

In the Beitri High-tech Industrial Park in Guangming District, Shenzhen, production lines in the workshop are running at full capacity. Coinciding with the vigorous development of the new energy industry market, as the world's leading supplier of lithium battery positive and negative material solutions, Bertrand is producing and supplying at full capacity. "This policy comes at the right time for us." Bertrey's policy is "just in time" to be accurate. Just a few days ago, Ren Jianguo, general manager of the company, mentioned in a speech that he hoped to seize the "golden 10 years" of industry development, especially before 2025, to consolidate Beitri's leading position in the anode material industry and bring the company to a new level in all aspects. "Negative electrode material leader" "North Stock Exchange market value of the first brother", with these labels, is a continuous practice of their own "internal strength" of the deep enterprises. On June 6, the "Shenzhen Action Plan for Cultivating and Developing New Materials Industry Clusters (2022-2025)" was released, proposing to combine my country's new generation technology, new energy vehicles and other major needs, focus on industrial development bottlenecks, and overcome a batch of new materials Key core technologies. Ren Jianguo said: "This is the direction Bertrand has been working." Recently, Beitri started the project of "annual output of 40000 tons of high-end anode materials" in Guangming District. As a major advanced manufacturing project, the silicon-based anode materials built by Beitri have broken through the "ceiling" of traditional anode materials and are regarded as the future of anode materials. He Xueqin, Chairman of Bertrand, said: "We attach great importance to the building of overall supply chain capabilities, especially the stable supply mechanism of core key materials." Based on this, the new projects initiated by Beitri all adopt integrated logic, and the self-supply rate of the company's key core processes is expected to reach more than 50%.

Bertrand Grasps Policy Dongfeng to Conquer Key Technologies
Why is the machine-added graphite plate dominant in the field of graphite bipolar plates?

Why is the machine-added graphite plate dominant in the field of graphite bipolar plates?

According to the research data of the Institute of Hydrogen and Electricity (GGII) of High Industry, Production and Research, the shipment scale of Chinese enterprises hydrogen fuel cell graphite bipolar plate reached 0.294 billion billion yuan in 2021, an increase of 49.24 percent over the previous year. Among them, the shipment scale of machine-added graphite plate was 0.257 billion yuan, up 48.55 over the previous year. In 2021, the proportion of CNC process shipments in the domestic graphite bipolar plate is more than 85%. This is because the machine plus graphite plate itself has advantages, in the graphite bipolar plate cost-effective trend, the production efficiency of the machine plus graphite plate in the increase, the price is down. The fuel cell bipolar plate is the "skeleton" in the stack, which is laminated with the membrane electrode and assembled into the stack, and plays the role of supporting, collecting current and distributing gas in the fuel cell. The importance is self-evident. Currently, fuel cell bipolar plates on the market are classified into graphite (composite) bipolar plates, metal bipolar plates, and the like. Among them, graphite bipolar plate technology has become more mature and occupies a dominant position in market applications. Graphite bipolar plates are divided into machine-added graphite plates (CNC machining process) and molded graphite plates according to different processing techniques. These two technical routes have their own characteristics. The advantage of machine-added graphite plate is that machine-added ink plate itself has the advantages of good conductivity, long service life, high power density, strong stability and excellent product performance. At present, the fuel cell industry is in the demonstration operation stage, and the market purchase volume of bipolar plate is not stable, and most of them are customized products. In this case, downstream enterprises are willing to choose machine-added graphite plate with good processing flexibility and strong adaptability for development and testing. The advantages of the molded graphite plate are short production time and high efficiency, which is more in line with the requirements of commercial mass production of fuel cells. However, compared with the machine-added graphite plate, this technical route is more difficult in process control and quality control, and the initial investment is more. Most fuel cell companies are actively expanding the diversified applications of fuel cells, such as hydrogen forklifts, cogeneration, drones, two-wheelers, etc. The applications in this part of the market are mainly machine-based graphite plates. The rise of diversified development momentum has expanded the market space of machine-added graphite plate. There are not many enterprises in China that can supply molded graphite plate products in batches, and downstream users have more opportunities to select machine-added graphite plates than molded graphite plates. In terms of graphite bipolar plates, it is inevitable that machine-added graphite plates occupy most of the market share.

Why is the machine-added graphite plate dominant in the field of graphite bipolar plates?
Haydale functionalized graphene conductive reinforcing filler

Haydale functionalized graphene conductive reinforcing filler

Every once in a while, there will be new scientific breakthroughs to change the world. According to an information disclosed by the British Haydale Company, a functionalized graphene conductive reinforcing filler developed by Haydale Company is currently a patented technology. The conductive reinforcing filler is added to the functionalized nanoparticles, and finally used in the preparation of prepreg, thereby forming a new type of functional integrated component, the technical director of the Haydale said that the functionalized graphene conductive reinforcement filler of this patented technology greatly enhances the stealth capability of the aircraft, or will bring revolutionary changes in the research process of stealth technology or wave-absorbing materials. Radar stealth is mainly to reduce the radar cross section (RCS) of the aircraft. The main measures are usually: a unique aerodynamic shape design, that is, through a special shape design to control the direction of the radar echo; the use of absorbing materials and absorbing structures that can absorb radar waves, so that the scattering field is weakened, which can not form an effective echo signal. For example, the United States F-117A stealth fighter. In the research process of stealth technology, absorbing materials and absorbing structures have become the biggest contribution point of stealth technology research. Absorbing materials can also be divided into two types from the material composition, one is a coated absorbing material, and the other is a structural absorbing stealth material. The coated wave absorbing material is made by adding wave absorbing agent to resin base or rubber base. This kind of wave-absorbing material construction, can be used brushing or spraying method of construction, can be applied to complex curved surface, such as wave-absorbing paint/stealth paint. However, this coating material has the problem of weather resistance, because it adheres to the surface of the aircraft, the surface adhesion gradually decreases with the change of service life and climate, and even falls off. At the same time, it also faces problems such as follow-up maintenance and repair. Structural wave-absorbing materials are usually made of resin/fiber-reinforced composites as carriers and added with absorbents. It is a kind of multi-functional composite material, which can not only carry the structural parts, but also have the advantages of light weight and high strength of composite materials, and can absorb or pass through electromagnetic waves well. It has become an important development direction of stealth materials. At present, some foreign military aircraft and missiles have adopted structural wave-absorbing materials, such as the horizontal stabilizer of SRAM missile, the edge of the A- 12 fuselage, the leading edge of the wing and the lift aileron, the fairing of the F-111 aircraft, the inlet of the Harrier-Ⅱ aircraft jointly developed by B- 1B, the United States and Britain, and the air-ship bomb ASM-1 and the wing of the ground-ship bomb SSM-1 developed by Mitsubishi Heavy Industries of Japan, in the picture, the UAV is jointly developed by the University of Central Lancashire and Haydale to use nano-graphene wave-absorbing carbon fiber prepreg as the "coat" of the UAV ". The rapid development of composite materials provides a guarantee for the development of structural absorbing materials. The new thermoplastic PEEK, PES, PPS and thermosetting epoxy resin, bismaleimide, polyimide, polyetherimide and isocyanate all have good dielectric properties, and the composite materials made of them have good radar transmission and transmission. In recent years, foreign countries have made a lot of improvement work on carbon fiber, such as changing the cross-sectional shape and size of carbon fiber, surface treatment of carbon fiber surface, so as to improve the electromagnetic properties of carbon fiber, etc., for wave-absorbing structure. The Haydale developed functionalized graphene wave-absorbing stealth filler can be used for the fusion of composite materials and resins without increasing the weight, endowing the body material with radar transmission and transmission, and forming a structural wave-absorbing material. Haydale, after years of research and development, Haydale functionalized graphene conductive reinforcing filler has applied for a patent for a process that allows graphene to be functionalized through a plasma reactor-even if it can be combined with other materials, thereby taking advantage of the properties of graphene and other nanomaterials to give ordinary materials the superpower of graphene.

Haydale functionalized graphene conductive reinforcing filler
Review of Covalent Chemical Control Methods for Graphene Oxide

Review of Covalent Chemical Control Methods for Graphene Oxide

Graphene has attracted extensive research interest in many fields due to its unique physical and chemical properties. However, its low solubility in most organic solvents and water, as well as its tendency to aggregate, prevent full utilization of its properties. Graphene oxide (GO) is an alternative material with high diffusivity in polar solvents. Graphene oxide contains rich oxygen-containing groups, mainly epoxides and hydroxyls, which can be further chemically derivatized. However, due to the high reactivity of graphene oxide, several reactions may occur simultaneously, usually leading to runaway graphene oxide derivatives. Recently, a research team led by Professor Cécilia Ménard-Moyon from the University of Strasbourg in France published a review article on the Nature Reviews Physics on the topic of Controlling covalent chemistry on graphene oxide, systematically discussing the chemical reactivity of graphene oxide and the problems that hinder the precise control of its functionalization, such as its instability, lack of clear chemical structure and the presence of impurities. The article focuses on the selective derivatization strategy of oxygen-containing groups and C = C bonds, as well as the challenge of unambiguously characterizing the final structure. This review not only briefly reviews the application of graphene oxide materials, links its chemistry and nanostructure with the required physical properties and functions, but also points out the future direction of improving the chemical control of graphene oxide. For more than 15 years, graphene has attracted interest in various fields due to its unique optical, electrical, thermal and mechanical properties. However, the low dispersibility of graphene in most organic solvents and water and its aggregation limit its processability. In addition, the sp2 basal plane of graphene is relatively inert, which inhibits its covalent functionalization, thus limiting its application range. In contrast, the oxidized form of graphene-graphene oxide (graphene oxide)-is highly dispersible in many solvents, and the rich oxygen-containing moiety provides a handle for extensive chemical derivatization. These properties facilitate processing and make the production of graphene oxide materials inexpensive and scalable. Graphene oxide is composed of flexible two-dimensional graphite flakes of atomic thickness with lateral dimensions on the nanometer to micrometer scale. The surface of graphene oxide is modified by oxygen-containing groups: many epoxide and hydroxyl (-OH) moieties are mainly located on the basal plane, while some carboxyl (-COOH) groups are present at the edges. It must be understood that graphene oxide is not a single compound, but a heterogeneous class of materials. The physical and chemical properties and corresponding applications of graphene oxide are defined by its composition and structure at different scales (Figure 1a). The properties depend on chemical details (e. g., the level of oxidation, the proportion and location of oxygen-containing groups, and the number of remaining non-oxygen groups), the density of defects and nanopores, and the distribution and aggregation of functional groups. The properties of the graphene oxide can be further modified by changing the microstructure, I .e., the size distribution and relative arrangement of the flakes (e. g., liquid suspended flakes, hydrogels, or laminates). This layered structure determines the optical and electrical properties of graphene oxide-based materials, as well as liquid, ion and gas transport properties. The chemical modification of graphene oxide provides an opportunity to controllably change the properties of related materials, improving their performance in many applications, including in environmental and energy-related fields, polymer composites, sensing, filtration, catalysis and Nanopharmaceuticals and other fields. However, since graphene oxide is unstable under heat and in the presence of strong bases, functionalization must be carried out under neutral and mild conditions to avoid dehydration and reduction of graphene oxide. Due to the relatively high reactivity of oxygen-containing groups in graphene oxide, multiple reactions may occur simultaneously during the functionalization process, which may lead to side reactions and synthesis of materials with unclear composition. Thus, controlled functionalization of graphene oxide requires a synthetic strategy and accurate characterization of functionalized materials requires technology. In this review, the article outlines the chemical reactivity of graphene oxide and discusses the factors that hinder the precise control of graphene oxide functionalization; these include the lack of a clear chemical structure of graphene oxide macromolecules, its thermal instability, Incompatibility with strong bases and possible impurities. The article details the selective covalent derivatization of different oxygen-containing groups and C = C bonds, focusing on facilitating the understanding of reactivity rather than mechanical details. The discussion in this article is limited to covalent chemistry because it provides graphene oxide conjugates that are more stable than graphene oxide conjugates produced by non-covalent interactions. Failure to grasp the heterogeneity of Go material often leads to erroneous conclusions and erroneous communication in the literature. Finally, the structure-function relationship of functionalized graphene oxide is discussed in the application examples of environment and energy related fields. Graphene oxide has been developed for various applications in different fields, from sensing, catalysis and composite materials to environmental science, energy and biomedicine. The chemical composition of graphene oxide affects its properties, and the covalent grafting of molecules on its surface represents a valuable strategy to adjust and improve the properties of materials to suit different applications. The article introduces examples of the use of functionalized graphene oxide in most application fields (ie, environmental and energy-related fields), and focuses on the study of functionalization of graphene oxide under mild conditions and high chemical selectivity. Environmental Applications In order to improve sustainability and energy efficiency, investigations have been conducted on the environmental application of graphene oxide in drinking water purification; membrane separation processes, including seawater desalination; and the collection of osmotic energy. The function and performance of graphene oxide-based materials in environmental applications, especially in the development of separation membranes, depends not only on the chemical properties of graphene oxide, but also on its hierarchical structure. A separation membrane made of graphene oxide consists of horizontally aligned graphene oxide flakes and nanosheets, stacked into a layered structure that is stable in water. Once hydrated, the film swells and the nature of the functional groups determines the interlayer distance between the lamellae. As the solution permeates between the sheets, it flows in a percolation path between the separated functional groups along the graphene oxide basal plane until it snakes through the membrane. The frictionless surface of the pristine graphene region facilitates ultrafast transport of water. The selectivity of the membrane is based on the size and dewaterability of the hydrated ion (determined by the interlayer distance), charge selectivity (through protonatable functional groups) and chemical affinity. For the accepted pressure-driven desalination (reverse osmosis) technology, graphene oxide membranes have not yet reached the performance of traditional thin-film composite membranes, mainly because of the poor ion/water selectivity of graphene oxide. Attempts to reduce the interlayer distance between graphene oxide flakes by physical confinement and chemical cross-linking have not significantly improved reverse osmosis performance. However, due to its high charge selectivity, graphene oxide membranes may still dominate in two emerging technologies: desalination by electrodialysis and energy harvesting by reverse electrodialysis. Other prominent applications of graphene oxide membranes are organic solvent separation and pervaporation, which is a membrane evaporation process that separates organic-water and organic-organic mixtures. Energy Applications Due to the increasing demand for energy, fuel cells have attracted great interest because they are an environmentally friendly and efficient alternative energy source suitable for many applications. There are numerous articles on the use of functionalized graphene oxide in energy-related applications. In the article, the authors highlight several examples where the functionalization of graphene oxide has been well controlled. Proton exchange membrane (PEM) fuel cells are usually made of polyelectrolytes, which convert chemical energy into electrical energy through an electrochemical reaction between hydrogen and oxygen, while producing water and heat. The performance of proton exchange membranes depends to a large extent on their proton transport capacity. Therefore, a lot of research work has been invested in the development of proton exchange membranes with high proton conductivity. In this regard, there are mainly two methods: modifying existing polyelectrolytes and proton exchange membranes with additives, or synthesizing new polyelectrolytes to design new proton exchange membranes. For example, graphene oxide functionalized with Nafion by an atom transfer radical addition reaction is used as an additive for Nafion-based composite proton exchange membranes for fuel cells. Compared with Nafion membrane, the composite shows higher proton conductivity. The improvement in performance is attributed to the aggregation of the sulfonic acid groups of the Nafion chains grafted onto graphene oxide, forming proton-conducting domains. As analyzed in this paper, the relatively low production cost of graphene oxide, its dispersibility in various solvents including water, and its tunable surface chemistry make graphene oxide an attractive building block for multifunctional materials. In many applications, maintaining the intrinsic properties of graphene oxide is critical. For example, the high density of oxygen-containing groups in graphene oxide leads to high water dispersibility and high proton conductivity and water retention. Therefore, the derivatization of graphene oxide must be well controlled to impart new properties, and the functionalized samples must be thoroughly characterized. These tasks are complicated because the chemical structure of graphene oxide has not been fully elucidated, and the level of defects and the ratio of different oxygen-containing groups may vary depending on the synthesis scheme and the source of the graphite. All structural models focus on the fact that the basal plane of graphene oxide is rich in epoxides and hydroxyl groups, which can be functionalized to adjust the properties of the material, while the carboxyl groups are only present in small amounts. Although great progress has been made in the functionalization of graphene oxide, the chemical properties of graphene oxide are not always well controlled and are not fully understood. The article points out that the reactivity of graphene oxide is determined by a complex set of factors, because the oxygen-containing groups are located in an abundant and unusual chemical environment, and significant in-plane distortion and strain in the crystal lattice will increase their reactivity. Due to the different oxygen-containing groups on the surface of graphene oxide and the high chemical reactivity of certain reagents, simultaneous reactions may occur to produce uncontrolled graphene oxide derivatives. The main purpose of this review is to clarify the chemical reactivity of graphene oxide and provide key and useful suggestions on how to promote its functionalization without reducing materials that will affect its performance. The article emphasizes the importance of chemoselective reactions, which allow one specific oxygen-containing group or C = C bond to be derivatized without affecting other moieties, thus providing the possibility for controlled multi-functionalization of graphene oxide. The simplest and most effective strategies involve epoxides and hydroxyls because of their abundance. In this review, the article mainly describes reactions that do not require thermal activation and proceed at room temperature. When functionalizing graphene oxide, it is important to use mild reaction conditions, particularly in terms of temperature and pH when needed, to avoid removal of labile oxygen-containing groups and degradation of the graphene oxide framework.

Review of Covalent Chemical Control Methods for Graphene Oxide
July 1 Party Building Festival | Graphite Valley Launching "Remembering Revolutionary Martyrs and Promoting Patriotism" Theme Day

July 1 Party Building Festival | Graphite Valley Launching "Remembering Revolutionary Martyrs and Promoting Patriotism" Theme Day

In order to solemnly commemorate the 101 anniversary of the founding of the Communist Party of China, encourage and guide party members and cadres to carry forward the heroic spirit, inherit the red gene, and create a strong atmosphere for celebrating "July 1", on July 1, the CPC Heilongjiang Graphite Valley Industry Group and Harbin Longene carbon material Joint Committee organized all party members and cadres to visit the Northeast Martyrs Memorial Hall and carry out party day activities with the theme of "remembering revolutionary martyrs and carrying forward patriotism. Our party members and cadres fully understand history, remember history, inherit the red spirit, and cultivate patriotic feelings. The Northeast Martyrs Memorial Hall is one of the earliest revolutionary memorial museums established in my country. It mainly displays the representative deeds of martyrs who died in the Northeast during the War of Resistance Against Japan and the War of Liberation. Its building is the former site of the Puppet Manchukuo Police Hall during the Japanese and Puppet Period. Many Communists and patriots were detained and tortured here. The famous anti-Japanese heroine Zhao Yiman was tortured by the enemy here. In the exhibition hall, everyone reviewed the deeds of Yang Jingyu, Li Zhaolin, Zhao Shangzhi, Zhao Yiman, Chen Hanzhang and other revolutionary martyrs, and deeply realized the indelible strong will of the martyrs on the road of the Chinese revolution. Shuttling between the exhibition halls, the precious historical photos on the walls seem to make time go back to the era of bloody struggle and succession, and everyone is deeply infected and shocked. During the activity, under the guidance and explanation of the commentator, the comrades visited the exhibition halls of the memorial hall in an orderly manner to learn about the typical deeds of the martyrs in different periods in Northeast China, and personally felt that during those arduous years, the Chinese Communists made great contributions to resist aggression and national liberation, and everyone present was baptized and sublimated in spirit, deeply feeling that the revolutionary spirit of the revolutionary martyrs who are loyal to serve the country, are not afraid of hardships and dangers, and have the courage to devote themselves has inspired everyone. Our party members have expressed: We must cherish today's happy life, work harder, and keep in mind the party's purpose. The party members and cadres of our company deeply look back at the years of the Northeast Anti-Japanese Alliance's arduous and arduous battles, deeply understand the family and country feelings of the revolutionary ancestors who promised the party and served the country with loyalty, and deeply cherish the noble spirit of the heroes of the Anti-Japanese Alliance who were not afraid of hardships and dangers and were not afraid of sacrifice. In front of the "Immortal Name" Martyrs Wall, Xu Qin and others paid tribute to the martyrs and expressed their deep memory of the revolutionary martyrs to Yang Jingyu, Zhao Shangzhi, Zhao Yiman and other martyrs. Finally, our party members and cadres stood in front of the party flag and raised their right fists, solemnly swore, expressed their love and loyalty to the party organization with sonorous vows, strengthened their ideals and beliefs, remembered the mission of party members, never forgot their original aspirations, and forged ahead.

July 1 Party Building Festival | Graphite Valley Launching "Remembering Revolutionary Martyrs and Promoting Patriotism" Theme Day
Preparation of Flexible Ferromagnetic Graphene Quartz Fiber Fabric with Super-large Size and Ultra-wideband Strong Electromagnetic Shielding Properties

Preparation of Flexible Ferromagnetic Graphene Quartz Fiber Fabric with Super-large Size and Ultra-wideband Strong Electromagnetic Shielding Properties

Liu Zhongfan of Peking University and Beijing Graphene Research Institute-The research team has made important progress in the preparation and application of flexible graphene quartz fibers. The team reported for the first time the use of roll-to-roll chemical vapor deposition (CVD) technology to batch prepare large-area, lightweight, flexible, ferromagnetic graphene quartz fiber fabric (FGQF) with ultra-wideband strong electromagnetic shielding effectiveness. The relevant results are titled "Ultra-broadband strong electromagnetic interference shielding with ferromagnetic graphene Quartz fabric. In this work, an oversized flexible ferromagnetic graphene quartz fiber fabric (FGQF) was first prepared using a roll-to-roll CVD batch growth system. By precisely controlling the nitrogen doping type of graphene, the preparation of ferromagnetic graphene layers with high conductivity (3906 S · cm-1) and high magnetic response (saturation magnetization of 0.14 emu · g-1 at room temperature) was achieved (Figure 1a). At the same time, the special woven structure of FGQF fabric introduces additional multiple reflection and multi-channel absorption of electromagnetic waves into the material, which further enhances the electromagnetic shielding effectiveness of the material. The 1 mm thick FGQF exhibits a superior shielding effectiveness of 107 dB at an ultra-wide band of 1-18 GHz, while achieving high EMI shielding efficiency and a wide EMI immunity band (Figure 1c). Using the graphene roll-to-roll continuous CVD growth system independently developed by the team (Figure 1b), the large-scale preparation of FGQF was realized, with a single batch preparation size of up to 10 × 0.5 m2 (Figure 1d), which provides an important basis for the practical application of materials. Based on the high conductivity, ferromagnetism and special woven structure of FGQF, when the electromagnetic wave reaches the surface of the material, it interacts with the free carriers on the surface of graphene, and part of the electromagnetic wave is reflected. By optimizing the impedance matching at the air-material interface, the remaining electromagnetic waves will enter the inside of the FGQF, match with the FGQF conductive network, and produce multiple internal reflections in its woven structure. Therefore, the ferromagnetic graphene layer with high conductivity and high magnetic response can achieve effective absorption and attenuation of electromagnetic wave energy (Figure 2a). The shielding mechanism of single ferromagnetic graphene quartz fiber (about 7 μm in diameter) in FGQF fiber cloth is analyzed in detail. The electromagnetic wave is reflected multiple times in the adjacent fiber array, and the multilayer ferromagnetic graphene can efficiently absorb the reflected electromagnetic wave, further attenuate the electromagnetic wave energy, so as to obtain high electromagnetic shielding effectiveness.

Preparation of Flexible Ferromagnetic Graphene Quartz Fiber Fabric with Super-large Size and Ultra-wideband Strong Electromagnetic Shielding Properties
Warmly Congratulate Graphite Valley on Winning the Third Prize in the Growth Group of the 5th Harbin Innovation and Entrepreneurship Competition

Warmly Congratulate Graphite Valley on Winning the Third Prize in the Growth Group of the 5th Harbin Innovation and Entrepreneurship Competition

In order to thoroughly implement the innovation-driven development strategy, cultivate and develop new kinetic energy, further stimulate the enthusiasm for innovation and entrepreneurship in Bingcheng, support the innovation and development of small and medium-sized enterprises, and provide strong scientific and technological support for building an "innovation leading city", Harbin held the 11th China Innovation and Entrepreneurship Competition Heilongjiang Division and the 5th Harbin Innovation and Entrepreneurship Competition from July 14 to July 21. Since the start of the competition, it has received extensive attention from all walks of life. A total of 119 high-quality projects meet the requirements of the competition. The participating projects cover new generation information technology, biomedicine, high-end equipment manufacturing, new materials, new energy and other high-tech fields, gathering new achievements, new technologies and new ideas in various fields. The electronic scoring system was adopted throughout the competition, and the Harbin Notary Office was invited for notarization to ensure the openness, fairness and justice of the process and results of the competition. After online and offline demonstration, defense, expert questions, judges' scoring and other methods in the preliminary and final competitions, according to the unified scoring rules of the competition system, Graphite Valley won the third prize in the growth group for its new generation of ultra-high pressure homogenizer project. Liu xiukuan, member of the Party group and deputy director of Harbin Science and Technology Bureau, extended warm congratulations to the award-winning enterprises on behalf of the organizers. Leaders of relevant units such as the Provincial Department of Science and Technology, the Municipal Science and Technology Bureau, the Municipal Education Bureau, the Municipal Human Resources and Social Security Bureau, the Municipal Youth League Committee, and the Municipal Women's Federation attended the award ceremony and presented awards to the award-winning representatives. As an innovative high-tech industrial group focusing on the fields of new energy and new materials, focusing on the R & D, production and sales of graphite, graphene, carbon materials and their applications, since its establishment, it has been based on scientific development and focused on independent innovation. Adhering to the innovative concept of "science and technology changes the world, innovation leads the future", and constantly pursues technology, product, service and management innovation; in the future, Graphite Valley will build and build a complete ecological block chain of graphite (ene) new material industry through industrial layout, scientific innovation, and combined with the capital market, promote industry development, give full play to Longjiang's advantages, create industrial highlands, grasp development opportunities, and adhere to Innovation leads, determined to become a leader in the new energy and new materials industry, to promote the rapid and healthy development of strategic emerging industries, and to contribute to the sustainable economic and social development.

Warmly Congratulate Graphite Valley on Winning the Third Prize in the Growth Group of the 5th Harbin Innovation and Entrepreneurship Competition
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