In the quest for sustainable solutions to combat climate change, researchers at KAIST have made a groundbreaking discovery that could revolutionize the way we store and separate gases. The team, led by Professor Jihan Kim, has developed a computational framework that enables the creation of 'gas lattices' within porous materials, opening up new possibilities for carbon capture, hydrogen storage, and advanced energy technologies.
The concept of gas lattices is not entirely new, but the approach taken by the KAIST team is. Traditionally, gas molecules were thought to adsorb randomly within the pores of sponge-like materials. However, the researchers have now shown that by using a combination of large-scale screening of metal-organic frameworks (MOFs) and machine-learning-guided inverse design, it is possible to create a crystal-like ordered state formed by gas molecules under confinement.
One of the key findings of the study is the identification of a cobalt-based porous material, Co-CAU-36, which stabilizes xenon in a regular lattice. Computer simulations confirmed that xenon inside this material does not spread out randomly but instead lines up in a body-centered cubic (BCC) lattice, a well-defined, crystal-like arrangement. This is a significant breakthrough because gas crystallization was achieved within the pores without the extreme bulk pressures normally required by using the pore structure as a 'template'.
The team also examined the separation of xenon and krypton, a gas mixture of industrial importance. Inside the framework, xenon preferentially occupies an ordered shell region, displacing krypton toward the pore core - a separation behavior that had not been reported before. This finding has significant implications for the development of advanced energy and environmental technologies that depend on precise control of molecular arrangement.
The research team's approach of using machine learning and genetic algorithms to identify candidate porous structures targeting BCC- and FCC-like lattices is particularly innovative. By deliberately designing the porous structures, the team has shown that the phenomenon of gas lattices can be achieved rather than occurring incidentally. This opens up new possibilities for the development of tailored materials for gas separation and storage.
In my opinion, the significance of this research lies in its potential to move beyond conventional approaches focused primarily on increasing adsorption capacity. By treating the arrangement of gas molecules itself as a design target, the KAIST team has opened up new avenues for the development of advanced energy and environmental technologies. If this approach can be extended to more complex molecules, such as carbon dioxide or water, it could become an important starting point for designing tailored materials for gas separation and storage.
The findings of this research were published in the international academic journal Nature Communications, and the work was supported by grants from the National Research Foundation of Korea (NRF), funded by the Ministry of Science and ICT. The research team included Younghun Kim, Dohoon Kim, Seungwoo Kim, and Yunsung Lim, all of whom are PhD candidates or masters candidates in KAIST's Department of Chemical and Biomolecular Engineering. The paper title is 'Framework-templated gas lattices in metal-organic frameworks', and the DOI is 10.1038/s41467-026-74776-5.
