Fig. 4: Mechanism behind motion.
From: Engineering motile aqueous phase-separated droplets via liposome stabilisation
a Illustration for the Marangoni effect. FM is the force induced by Marangoni stresses, while FD is the viscous drag force. γL and γ0 is the interfacial tension between PEG-rich and DEX-rich phase with or without the presence of liposomes. b The total intensity of liposome coating and corresponding droplet velocity (U) for different droplets. c The relationship between maximum velocity (Umax) and droplet diameter (D). The difference in the slope for different batches is due to the variations in polymer gradients. d The relationship between normalised velocity (UR, the ratio of droplet velocity at different time points to its maximum velocity) and the value of ε (h/D). 20 droplets from four trials were chosen for analysis. e Chasing and merge process for two droplets with different diameter. Pictures were extracted from Supplementary Movie 6 and cropped for better presentation. Scale bar is 50 μm.
