“…Janus particles (JPs) are a class of anisotropic colloidal particles that possess different chemical compositions (and opposing wettability) on each hemisphere. − This amphiphilic nature allows JPs to adsorb much more strongly at the water–oil interface (up to a 3-fold increase in detachment energy) compared to randomly functionalized counterparts due to much lower liquid–particle surface tensions. − As a result, JPs can generate emulsions where interfacial particle self-assembly, orientation, and droplet morphology are governed by the type and density of functional groups on each hemisphere, and by the particle shape and architecture (e.g., spherical, cubic, icosahedral, nanosheets, dumbbell, mushroom-like). − These properties make JPs excellent candidates for engineering biphasic catalytic reactions at the water–oil interface, by carefully locating catalytic centers on either the water or oil sides of the interface. , JPs with catalytic centers located on their hydrophobic hemispheres are suitable for reactions in oil phases, including organic synthesis − and desulfurization . In contrast, JPs with catalytic centers located on their hydrophilic hemispheres can promote dye decomposition − and photocatalytic water splitting. , JPs can also be employed to design interfacial catalysts with spatially isolated acid and basic centers, promoting acid–base tandem reactions …”