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Researchers have developed a method to create nanoparticles from olivine, a volcanic rock, using a gas aggregation magnetron sputtering technique. The nanoparticles show enhanced ability to capture and mineralize atmospheric CO2 compared to bulk olivine, without requiring high temperatures or pressures. The team optimized particle production by introducing hydrogen into the argon plasma and adjusting aggregation distance, and confirmed that the resulting nanoparticles successfully absorb atmospheric carbon dioxide.
Why it matters
This technology could provide a more energy-efficient approach to direct air capture and permanent carbon storage by converting an abundant natural mineral into highly reactive nanoparticles. The method represents a potential pathway toward economically viable carbon capture systems and opens possibilities for converting other minerals into functional nanoparticles.
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⚠️ Preprint – Noch nicht peer-reviewed
Dieser Artikel wurde noch nicht von unabhängigen Experten begutachtet. Die Ergebnisse sind vorläufig und sollten mit Vorsicht interpretiert werden.
Abstract: The two-birds-one-stone mineralization of CO2 by olivine, is a promising method to both capture carbon directly from the atmosphere and at the same time locking it for storage or utilization. Converting olivine to the nanoscale considerably enhances the kinetics without the need for high temperatures or pressures. Here we present the fabrication of olivine nanoparticles from a natural rock that were fabricated in a gas aggregation magnetron nanoparticle generator. The nanoparticle yield was optimized by enhancing the argon plasma sputter plasma by hydrogen introduction and varying the aggregation distance. The hysteresis of the argon sputter plasma with respect to power is a promising property towards energy efficiency. The formation of well-defined olivine nanoparticles and their subsequent absorption of atmospheric CO2 was confirmed by a suite of techniques. The olivine sputter target surface revealed an intricate interplay between the sputter plasma and olivine composition in terms of crystallinity and morphology. More broadly, this work forms the next step in the practical application of Olivine nanoparticles for economical carbon capture and storage, it also is the starting point for the use of this specific nanoparticle technology for mineral-to-nanoparticle conversion.