Figure 1
Olga Kuksenok/University of Pittsburgh;(panel (c) adapted from Fallah-Araghi et al. [6])

Figure 1: (a) Schematic of the reaction A+Ak1k-1AA in the aqueous droplet; grey circles represent nonfluorescent reactant A and green circles represent fluorescent product AA. Product AA generated at the surface desorbs into the droplet’s interior (as marked by arrows) resulting in enhanced synthesis. (b) The apparent forward reaction rate constant k1 and the apparent equilibrium constant Keq=k1/k-1 are inversely proportional to the droplet radius R. (c) Fluorescence imaging of droplets with radii 34 micrometers (upper image) and 8 micrometers (lower image) illustrates an increase in concentration of fluorescent product AA in the smaller droplets with the color change of these droplets with respect to the larger ones.