Alternatively, the simple evaporation of a particle's dispersion confined in a drop has been implemented to directly deposit, or print, colloidal assemblies on a substrate. Indeed, both past and recent developments in particle self-assembly addressed the drying of sessile drops of colloidal suspensions as a direct and simple method for the fabrication of functional materials. However, a major limitation for the formation of an ordered monolayer from evaporating drops is the so-called "coffee-ring" effect, denoting the transport and accumulation of particles toward the pinned drop contact line. As a result, rings or stripes pattern composed of several particle layers are commonly obtained. Such an effect can be controlled or suppressed following various strategies, resulting in the formation of domes or homogeneous deposits with controlled thickness. For example, when drops are deposited on partially wettable surfaces, conditions in which the drop evaporates with a constant contact angle and decreasing contact area minimize the evaporative gradient, leading to the formation of uniform 3D colloidal crystals with spherical cap geometry. Fewer available strategies have proven suitable for the deposition of ordered monolayers, and are often limited to functionalized nanoparticles or engineered microgel particles, to minimize sedimentation and favour adsorption to the air/water (a/w) interface rather than to the substrate. More generic approaches take advantage of controlled evaporation 34 /condensation, often using a cosolvent or additives like ethylene glycol or formamide, but remain limited to relatively small defect-free monolayers and require a tightly controlled, and often long, evaporation process.