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High-temperature thermal shock and material modification: Professor Huang Zhaohui's team at China University of Geosciences (Beijing) used ultrafast Joule heating technology, combined with multi-dimensional characterization methods such as XRD, FT-IR, TG-DSC and SEM, to systematically study the thermal behavior and phase change characteristics of Guangxi sandy kaolin and Inner Mongolia hard kaolin in the range of 400°C to 1200°C. Flash Joule Heating Machine (FJH) technology can also quickly heat materials to high temperatures, triggering the reorganization of the internal structure of the material and the formation of defects, and achieving precise control of the material's microstructure. Both use the violent reaction conditions brought about by high-temperature thermal shock to promote efficient modification of the target material.
Rapid heating and performance optimization: Ultrafast Joule heating technology achieves efficient heat treatment of kaolin through rapid heating, optimizes its structure and performance, and significantly improves phase change efficiency. FJH technology is also commonly used for rapid heating and performance optimization in the preparation of other materials. For example, in the preparation of carbon-based materials such as graphene, the defect density and electronic structure of the material can be regulated by rapid heating, thereby optimizing its conductivity and chemical activity.
High efficiency and low cost: Ultrafast Joule heating technology can complete the heat treatment of kaolin in a very short time, which is highly efficient. FJH technology also greatly shortens the time for material preparation, improves production efficiency and reduces production costs with its characteristics of rapid heating and cooling. The combination of the two can further improve the efficiency and performance of material preparation, reduce production costs, and provide technical support for the large-scale production of high-performance materials.
Environmental friendliness: Ultrafast Joule heating technology avoids the long-term energy consumption and environmental pollution problems in traditional high-temperature treatment. FJH technology does not require the use of solvents or reaction gases during material synthesis, and has low energy consumption, which meets the current requirements of environmental protection and sustainable development.
Further optimization of material properties: FJH technology can be applied to the subsequent treatment of kaolin treated by ultrafast Joule heating technology. Through further rapid heat treatment, the crystal structure and defect distribution of kaolin can be optimized, and its heat treatment efficiency and stability can be improved. For example, more uniform defect distribution and stronger metal-carrier interaction can be achieved through FJH technology, which can enhance the sintering resistance and long-term stability of kaolin.
Development of new materials: Combine the rapid synthesis capability of FJH technology and the structural regulation advantages of ultrafast Joule heating technology to explore and develop new kaolin-based materials. For example, try to use FJH technology to perform rapid heat treatment and structural optimization on other types of clay minerals or composite materials, and then use ultrafast Joule heating technology for heat treatment to achieve higher performance and better application effects.
Optimization and standardization of process parameters: In-depth study of the synergistic mechanism of FJH technology and ultrafast Joule heating technology in the material preparation process, and optimize process parameters such as heating temperature, heating time, current density, etc. Establish standardized process flow to ensure the stability and consistency of material performance, and provide reliable technical support for the commercial production and application of kaolin-based materials.
Thermal behavior of kaolin: Professor Huang Zhaohui's team systematically studied the thermal behavior and phase change characteristics of Guangxi sandy kaolin and Inner Mongolia hard kaolin in the range of 400°C to 1200°C by ultrafast Joule heating technology, combined with multi-dimensional characterization methods such as XRD, FT-IR, TG-DSC and SEM. The study found that there are significant differences between sandy kaolin and hard kaolin in dehydroxylation temperature, phase change energy demand and mullite formation crystallinity, among which hard kaolin shows higher mullite crystallinity and conversion efficiency. This method not only reveals the dynamic structural evolution law of kaolin under ultrafast heating conditions, but also provides an important technical reference for the rapid processing and heat treatment research of mineral materials.
Preparation of graphene film: Professor Hu Liangbing's team used Joule heating ultra-high temperature reduction technology to instantly heat the pretreated RGO film to 2750K, achieving efficient defect repair and high crystallization of the structure, and significantly improving the conductivity of the film. This method not only improves production efficiency, but also significantly reduces energy consumption, providing a new technical path for the large-scale production of graphene films.
Technical Scalability: As an efficient and fast preparation technology, ultrafast Joule heating technology can be applied to the research and development of other two-dimensional materials and nanostructures. For example, the graphene film prepared by FJH technology is significantly better than the traditional graphene oxide film in heat dissipation performance, showing a more uniform heat dissipation effect.
Industrialization potential: The light weight and flexibility of the highly conductive RGO film make it an ideal material to replace metal current collectors, and it is expected to be promoted in energy devices such as lithium-ion batteries and supercapacitors. In addition, the application of FJH technology in the preparation of high-performance graphene films also demonstrates its great potential in flexible electronics, photovoltaics, energy storage and other fields.
Future research directions: Further optimize the ultrafast Joule heating process to reduce energy consumption and cost, and study the application possibility of this technology in the preparation of larger-scale thin films and multifunctional devices. At the same time, combine machine learning and big data analysis to optimize the composition and microstructure of high-entropy alloys to further improve their catalytic performance and practical application capabilities.
Electrospinning Nanofibers Article Source:
https://doi.org/10.1016/j.tca.2024.179894
