Abstract: From the autonomous navigation of childhood foam boats to modern targeted drug delivery systems, surface tension and Marangoni flow consistently play pivotal roles. Using the self-propelled motion of polyethyleneimine/poly(sodium 4-styrenesulfonate) (PEI/PSSNa) droplet motors as a model system, we designed three experimental modules: single droplet motion observation, Marangoni flow field visualization, and droplet transport demonstration. These experiments elucidate the fundamental mechanisms of surface tension gradients and Marangoni flow. Through an edutainment approach incorporating multi-level science communication strategies, accessible language, interactive experiments, and comprehensive demonstrations, we showcase the remarkable capabilities of surface tension and Marangoni flow. This methodology not only sparks audiences’ enthusiasm for chemical exploration but also enables them to genuinely appreciate the wonders of chemistry, while establishing a conceptual bridge between fundamental science and technological innovation.

Key words: Interfacial chemistry, Surface tension, Marangoni flow, Droplet motors, Science popularization