Phase separation in active binary mixtures with chemical reaction.

We study motility-induced phase separation (MIPS) in active AB binary mixtures undergoing the chemical reaction A ⇌ B. Starting from the evolution equations for the density fields (,) describing MIPS, we phenomenologically incorporate the effects of the reaction through the reaction rate into the equations. The steady-state domain morphologies depend on and the relative activity of the species, . For a sufficiently large and ≠ 1, the more active component of the mixture forms a droplet morphology. We characterize the morphology of domains by calculating the equal-time correlation function (,) and the structure factor (,), exhibiting scaling violation. The average domain size, (), follows a diffusive growth as () before reaching the steady state domain size, . Additionally, shows the scaling relation , independent of .