Complex coacervates are water droplets dispersed in water, which are formed by
spontaneous liquid–liquid phase separation of an aqueous solution of two oppositely
charged polyelectrolytes. Similar to the membraneless organelles that exist in biological
cells, complex coacervate droplets are membraneless and have a myriad of features
including easy formation, high viscosity, selective encapsulation of biomolecules, and
dynamic behaviors in response to environmental stimuli, which make coacervates an …