Preparation of SiO 2 -wax colloidosomes 250 mg of SiO 2 particles were dispersed in didodecyldimethylammonium bromide (DDAB) solutions with concentrations corresponding to an approximate surfactant monolayer coverage on all particles (5 mL, 0.0054 mg/mL) . Wax (230 mg) was added to the suspension, and then placed in an silicone oil bath at 75 • C, and first stirred at 3000 RPM for 15 minutes after the wax had melted with a T-25 digital ULTRA-TURRAX. After this initial dispersion step, the suspension was then homogenized under vigorous stirring for 160 s (11000 RPM) . After homogenization, the hot, wax-in-water SiO 2 particle-stabilised Pickering emulsion was then rapidly cooled in an ice-bath to obtain solidified SiO 2 -wax colloidosomes. The colloidosomes were then washed consecutively by gravitational sedimentation with distilled water to remove excess wax and unattached particles (2 times, 50 mL), a 0.1 M NaCl solution to remove the DDAB cationic surfactant (2x, 50 mL), then distilled water (3x, 50 mL) to remove any salt.