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Synthesis of high entropy alloy nanoparticles: Professor Hu Liangbing's research group at the University of Maryland, USA, successfully synthesized high entropy alloy nanoparticles (HEA-NPs) containing up to eight different metal elements, such as Pt, Pd, Ni, Fe, Co, Au, Cu and Sn, through CTS technology. This method achieves high uniformity and size-controllable nanoparticle synthesis by loading metal salt precursors onto carbon carriers and rapidly heating and cooling at ultra-high temperatures of 2000 K.
Excellent catalytic performance: Five-element HEA-NPs (containing Pt, Pd, Rh, Ru, Ce) were used as catalysts for ammonia oxidation reactions, demonstrating nearly 100% ammonia conversion and more than 99% selective conversion efficiency to NOx. This performance is significantly better than catalysts of similar composition prepared by traditional wet chemical methods.
Fast heating and cooling: Flash Joule Heating Machine can heat materials to extremely high temperatures (up to 3000K or more) in a short time (usually milliseconds to seconds) and has an extremely high heating and cooling rate (10^5-10^6 K/s). This rapid heating and cooling process helps to prepare new materials with specific properties.
Wide range of applications: This technology is not only suitable for the synthesis of two-dimensional materials such as graphene, but also used in high entropy alloys, urban resource recycling, single-atom catalysts, preparation of clean hydrogen, and synthesis of metastable nanomaterials.
Environmentally friendly and cost-effective: Flash Joule Heating Machine does not require the use of furnaces, solvents or reaction gases during the synthesis process, which significantly reduces the impact on the environment. At the same time, its high efficiency and low energy consumption also make the material synthesis cost lower.
Similar high-temperature rapid heating principle: Both use the principle of high-temperature rapid heating to achieve rapid synthesis and structural transformation of materials. CTS technology synthesizes high entropy alloy nanoparticles by rapidly heating and cooling metal salt precursors on carbon supports at ultra-high temperatures; while Flash Joule Heating Machine achieves rapid heating and subsequent rapid cooling of materials through the heat generated by current passing through a conductor.
High efficiency of nanomaterial synthesis: Both technologies can achieve efficient synthesis of nanomaterials. CTS technology can quickly alloy up to 8 different elements into a single-phase solid solution within 55 milliseconds
; Flash Joule Heating Machine can heat gram-level raw materials to 4000K within 1 second to achieve rapid synthesis of nanomaterials such as graphene.
Potential for optimizing material properties: Both technologies can optimize the properties of synthetic materials by precisely controlling heating and cooling parameters. CTS technology achieves precise control of particle size and structure by adjusting impact parameters; Flash Joule Heating Machine can precisely control the heating temperature and time of materials by changing discharge parameters, thereby optimizing the morphology, size distribution and phase state of the materials.
Carbon thermal shock (CTS) technology and Flash Joule Heating Machine have similar high-temperature rapid heating principles and high efficiency in nanomaterial synthesis, opening up new research areas for material discovery and optimization. Future research can further explore the application potential of these two technologies in different material systems, optimize synthesis parameters to achieve more precise material property control, and promote their large-scale application in industrial production. This will help develop more new nanomaterials with excellent performance and broad application prospects, and provide strong support for the development of materials science and related fields.
Electrospinning Nanofibers Article Source:
https://www.science.org/doi/10.1126/science.aan5412
