Abstract:Development and optimization of multifunctional devices for fluidicmanipulation of films, drops, and bubbles require detailed understandingof interfacial phenomena and microhydroodynamic flows. Systems aredistinguished by a large suface to volume ratio and flow at smallReynolds, capillary, and Bond numbers are strongly influenced byboundary effects and therefore amenable to control by a variety ofsurface treatments and surface forces. We review the principlesunderying common techniques for actuation of droplets and films onhomogeneous, chemically patterned, and topologically textured surfacesby modulation of normal or shear stresses.