High-resolution SEM images were obtained using Magellan 400L (Thermo Fisher Scientific), operating at 2 KV. The sample of the coacervates in solution was prepared with pep3 (5 mM) in acetate buffer (pH 4.8, 25 mM, 3 M NaCl). The samples of the coacervates that form during evaporation were prepared either using pep1 (10 mM) or pep2 (5 mM) in phosphate buffer (pH 7.4, 25 mM, 0.3 M NaCl). The samples were deposited on clean silicon surfaces.