A joint research group led by Professor Shuji Fujii of the Department of Applied Chemistry, Faculty of Engineering at Osaka Institute of Technology (President: Shin Inoue), who also holds an honorary professorship at Chulalongkorn University (Thailand), and Associate Professor Apichat Imyim of the Department of Chemistry, Faculty of Science at Chulalongkorn University (President: Bundhit Eua-arporn) has succeeded in developing droplets (liquid marbles) that function as carbon dioxide absorbents using naturally derived materials. Key Points of This Research: * Development of a new CO2 absorbent material composed of carbon particles derived from coconut shells and a liquid derived from amino acids. * The "liquid marble" structure, where liquid is encapsulated by particles, increases the CO2 absorption rate by approximately 2.5 times. * Expected to be applied to CO2 capture technologies with low environmental impact for the realization of a sustainable society. Reducing carbon dioxide (CO2) emissions, a cause of global warming, is a worldwide challenge. Currently, various technologies are being researched to capture CO2, but many require significant energy or use artificial materials, necessitating more environmentally friendly methods. This research group has developed a new CO2 absorbent material by encapsulating a natural liquid, "Natural Deep Eutectic Solvent (NaDES)," with "biochar particles" derived from coconut shells. By forming a "liquid marble" structure where the liquid is enclosed by particles, the internal liquid can efficiently contact the air, enhancing its gas uptake capacity. The NaDES used in this study is a highly safe liquid made from arginine, an amino acid, and glycerin, and it possesses the property of absorbing CO2. Experimental results showed that when NaDES was formed into a liquid marble structure, it absorbed CO2 approximately 2.5 times faster compared to the same amount of NaDES placed directly in a container. Furthermore, it was confirmed