Spontaneous formation of urea from carbon dioxide and ammonia in aqueous droplets

作者：Mercede Azizbaig Mohajer, Pallab Basuri, A. Yu. Evdokimov, Grégory David, Daniel Zindel, Evangelos Miliordos, Ruth Signorell · 发表于：Science · 年份：2025 · DOI：10.1126/science.adv2362 · 被引用次数：68 · 研究领域：Quantum, superfluid, helium dynamics、Light effects on plants、Advanced Chemical Physics Studies

Urea is a key molecule in the search for the origin of life and a basic chemical produced in large quantities by industry. Its formation from ammonia and carbon dioxide requires either high pressures and temperatures or, under milder conditions, catalysts or additional reagents. In this study, we observed the spontaneous formation of urea under ambient conditions from ammonia and carbon dioxide in the surface layer of aqueous droplets. Single, optically trapped droplets were probed by using Raman bands as markers. We found the surface layer to act like a microscopic flow reactor, with chemical gradients providing access to unconventional reaction pathways. This observation revealed a general mechanistic scheme for distinctive droplet chemistry. Interfacial chemistry is a possible nonenergetic route for urea formation under prebiotic conditions.