24
2023-05
On the morning of April 29, Chen Wenbo, Deputy Secretary of the Didao District Committee and District Mayor, visited the Harbin Institute of Technology Graphite Company for on-site work, listened to the recent work progress of the stationed work team, understood in detail the current issues that the enterprise needs to coordinate and resolve, discussed solutions with various departments on-site, and required relevant departments to follow up and implement in a timely manner to ensure that the issues are effectively resolved. Deputy District Mayor Zhao Jiabo and the main responsible comrades from relevant units also participated.
2023-05-24
24
2023-05
With a thousand sails competing and a hundred boats vying for the current, on April 7, the concentrated commencement and resumption ceremony for key projects of high-quality development in Didao District for 2023 officially started. The entire district is fully committed to seizing projects and promoting development with the momentum of 'the start is a decisive battle, and the beginning is a sprint,' striving to achieve a strong economic start and continuous growth throughout the seasons. Leaders including Sun Mingrui, Vice Chairman of the Municipal People's Congress Standing Committee, Zhang Guoqiang, Second-level Researcher of the Municipal Development and Reform Commission, Qian Guofeng, District Party Secretary, Zhao Shumei, Chairman of the District Political Consultative Conference, Tian Hongwei, District Party Deputy Secretary, Wang Ying, Organization Minister, Jin Yonghai, Deputy District Mayor, Li Tingting, and heads of relevant district departments, as well as representatives from enterprises, projects, and construction parties attended the concentrated commencement ceremony.
2023-05-24
24
2023-05
"Black Gold" Becomes Real Gold, "China's Graphite Capital" Starts Full-Chain Development
Heilongjiang Province Jixi City, known as the "Capital of Chinese Graphite", is based on the advantage of graphite resource reserves.
2023-05-24
24
2023-05
Recently, the Emergency Management Bureau of Didao District, Jixi City, invited three experts in provincial-level project technology and safety management to conduct supportive safety inspections of three enterprises under the Heilongjiang Harbin Institute of Technology Graphite Technology Co., Ltd. in our jurisdiction, in collaboration with the Municipal Emergency Management Bureau.
2023-05-24
24
2023-05
On the afternoon of March 7, Chen Wenbo, Deputy Secretary of the Didao District Committee and District Mayor, conducted an in-depth investigation at Harbin Institute of Technology Graphite, inspecting the planning and construction of the Harbin Institute of Technology High Carbon 50,000-ton expansion project, and on-site assisting the enterprise in coordinating and solving problems. Liu Tao, a member of the District Committee Standing Committee and Deputy District Mayor, Jin Yonghai, Deputy District Mayor, and the main responsible comrades from relevant units also participated in the investigation.
2023-05-24
24
2023-05
On February 14, Qian Guofeng, the Secretary of the Didao District Committee, visited Jixi Harbin Institute of Technology High Carbon Graphite Materials Co., Ltd. for research, helping the company solve difficulties and problems. The Deputy District Mayor Jin Yonghai and relevant personnel from the District Development and Reform Bureau and the Industry and Information Technology Bureau accompanied him.
2023-05-24
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2023-05
22
2019-05
The preparation of graphene determines the future of industrialization.
In the past decade, research and industrialization of graphene have progressed rapidly; however, the industrialization of graphene still faces many challenges and issues. The preparation technology aimed at the industrial application of graphene is not a simple scaling up of laboratory processes. Large-scale preparation imposes higher requirements on the reproducibility and cost of the preparation technology. Although both graphene powder and films have achieved large-scale production in terms of capacity, the growth processes, raw materials, equipment, and even production batches of graphene products vary, resulting in inconsistent product quality and performance, making it difficult to meet unified standards. Looking back at history and referencing the industrial development of another strategic carbon material—carbon fiber—it is clear that the quality of materials determines their application prospects. The carbon fibers developed could only be used for fishing rods, but now carbon fiber materials occupy an irreplaceable position in aerospace. This is due to the continuous improvement of carbon fiber's large-scale preparation technology and material quality, which has driven the widespread application of carbon fiber in the field. The graphene industry must strive to root itself in material preparation and solve the problem of large-scale production of high-quality materials to have a bright application future. In the past decade, the research groups of Liu Zhongfan and Peng Hailin at Peking University have made a series of important advances in the chemical vapor deposition (CVD) preparation and application of graphene. For the CVD preparation of high-quality graphene films, the research groups have developed various graphene CVD growth methods, controlling the domain size, number of layers, cleanliness, doping, and growth rate, and have successfully achieved the preparation of 4-inch wrinkle-free graphene single crystal wafers, large-area ultra-clean graphene films, continuous batch preparation of graphene films, and green non-destructive transfer, as well as the development of graphene glass and graphene-based LED devices. These innovative research results help to break through the technical bottlenecks in the preparation of high-quality graphene films and explore their application technologies, promoting the rational and sustainable development of graphene film materials and industry. The Liu Zhongfan and Peng Hailin research groups were invited to publish a review article titled "Graphene Industrialization - Preparation Determines the Future" in the international journal Nature Materials (Synthesis Challenges for Graphene Industry. Li Lin, Hailin Peng*, Zhongfan Liu*, Nature Materials 2019, 18, 520), which conducted an in-depth discussion and analysis of the current status and existing problems of graphene industrialization, and proposed the concept of "graded" graphene and possible "killer application" levels for graphene in the future. The article points out that the graphene market urgently needs standardization. The grading rules for graphene should involve its basic structure (domain size, number of layers, flatness, purity, doping level, etc.) and intrinsic properties (mobility, conductivity, transmittance, work function, thermal conductivity, etc.). The direction of efforts in material preparation and application exploration is the integration of materials. That is, the composite of graphene with other materials, utilizing the additional functions of graphene to achieve functional integration, which is also one of the pathways to graphene's "killer application" level. It has only been a little over a decade since the discovery of graphene, indicating that there is still much room for improvement and effort, and it tells us that the industrialization of graphene cannot be achieved overnight. Preparation determines the future; only by continuously improving graphene preparation can we welcome the dawn of the graphene industry. The corresponding authors of the above review article are Professor Liu Zhongfan and Professor Peng Hailin. This series of work has received strong support from the National Natural Science Foundation, the Ministry of Science and Technology research programs, and the Beijing Municipal Science and Technology Commission projects.
2019-05-22
22
2019-05
Graphite dissolution - Plasma emission spectrometry for the determination of 15 elements in blood
关键词： 石墨消解 等离子体发射光谱法 血液 元素 机构： 涟水县疾病预防控制中心 摘要： 目的研究建立用石墨消解-等离子体发射光谱法测定血液中15种元素的检测方法。方法取1 ml血样与1.5 ml硝酸混合,于石墨消解仪中,在120℃下消解1 h,冷却定容至10 ml,利用等离子体发射光谱法对消解液中的15种元素进行检测。结果该方法线性关系良好,相关系数（r）为0.999 5~0.999 9,检出限为0.001 0 mg/L~0.063 0 mg/L,回收率为85.5%~107.6%,相对标准偏差（RSD）为0.33%~2.07%。另外,采用本法和微波消解-等离子体发射光谱法对标准样品进行处理和检测,钼元素因参考值低于本方法的检出限,检测结果偏差较大,其余14种元素的RSD分别为0.21%~8.91%、0.89%~10.2%。结论本方法具有灵敏、准确、干扰少、精密度高、检出限低、线性范围宽、同时检测多元素等特点,适合于大批量血液样品中部分宏量元素和微量元素的测定。
2019-05-22
22
2019-05
Preparation and Application of Porous Graphene
Graphene is a two-dimensional carbon material composed of a single layer of sp2 hybridized carbon atoms arranged in a hexagonal pattern. It has advantages such as a large theoretical specific surface area, high intrinsic carrier mobility, high thermal conductivity, and ultra-high electrical conductivity at room temperature. Due to its unique structure and properties, graphene has gradually become one of the attractive application materials. However, graphene also has its shortcomings. In the field of digital electronics, due to the lack of a bandgap between the electrons in graphene, it is difficult to stop data transmission once it has started. The solution is to create a bandgap by perforating the surface of graphene or integrating two-dimensional graphene to construct a specific three-dimensional structure, forming a porous structure. Preparation Methods for Porous Graphene Template Method The template method can be divided into hard template and soft template methods based on the composition and characteristics of the template. Hard Template Method The preparation of porous graphene materials using the hard template method mainly involves four aspects: (1) preparing the hard template; (2) functionalizing/modifying the template surface to obtain suitable surface properties; (3) coating graphene or its derivatives, such as graphene oxide, onto the template using various methods; (4) selectively removing the template. The hard template method also has many drawbacks, such as relatively low yield, inability to achieve high production, significant limitations when using multi-step synthesis processes, and insufficient structural integrity during template removal. Soft Template Method The soft template method involves a self-assembly reaction between carbon precursors and soft templates, resulting in porous graphene through high-temperature carbonization and polymerization. The pore structure mainly depends on the synthesis conditions, such as the ratio of reactants, type of solvent, and reaction temperature. This method can be directly used to synthesize mesoporous or macroporous graphene materials. Compared to hard templates, soft templates essentially involve synthesis at the molecular level, constructing porous structures while utilizing chemical bonds or hydrophilic/hydrophobic interactions. In the process of preparing porous graphene materials using the soft template method, the chemical reaction between the template and surfactants plays a crucial role. Template-Free Method The template-free method includes etching, solvothermal, and chemical vapor deposition methods. Etching Method The etching method utilizes a chemical reaction between the etchant and graphene, causing the carbon atoms on the surface of graphene to be etched away, leaving behind a pore structure. This method has significant selectivity for material etching, meaning that etching stops immediately after completion, without damaging the remaining material layers. Solvothermal Method The solvothermal method involves using water or organic solvents as the reaction system in a specific high-pressure reaction vessel, heating it to the critical temperature, and synthesizing materials in a high-pressure reaction system. This method greatly reduces environmental pollution, and the porous graphene materials produced have the advantage of controllable pore size. Chemical Vapor Deposition Method The main process of preparing porous graphene materials using the chemical vapor deposition method involves introducing carbon-containing gases such as methane and acetylene, allowing the gaseous carbon source to deposit onto the surface of a solid substrate to produce graphene, and then gradually heating in a protective gas to obtain porous graphene materials. This method is simple to operate, allows for large-scale production, and the resulting porous graphene materials have a complete structure and excellent electrical conductivity. Applications of Porous Graphene and Its Composites Electrode Materials Using porous graphene or composite materials as electrode materials, their highly interconnected structure greatly facilitates the rapid transport of ions, resulting in high capacity and power characteristics. Environmental Adsorption Materials Porous graphene has a rich pore structure, and due to differences in preparation methods, it contains many defects on the surface, making it easier to introduce different functional groups. Porous graphene and its composites have numerous applications in oil/water separation, metal ion adsorption, and dye molecule removal. Separation Field Through model establishment and computer simulation, it has been found that porous graphene has high permeability and selectivity for gas molecules such as hydrogen (H2), nitrogen (N2), and hydrogen sulfide (H2S), effectively separating mixed gases such as H2/CH4, CO2/N2, and H2S/CH4. References: Wu Pengbo, Wang Chengjun, et al. Research Progress on the Preparation of Porous Graphene and Its Nanocomposites Zeng Yang, et al. Research Progress on the Preparation of Porous Graphene Materials Shi Peng, Hou Zhaoxia, et al. Research Progress on Porous Graphene and Its Composites
2019-05-22
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