Abstract
A renaissance in surface acoustic waves (SAW) has occurred, due mainly to their enormously powerful ability to manipulate fluids and colloids for microfluidics. Beyond the routine manipulation of drops, mixing, and separation and concentration of colloids using SAW, we have found fascinating behavior in the formation and propulsion of thin fluid films from a few tens to less than a micrometer thick in various directions, either with or against the acoustic wave propagation. Furthermore, we have seen—and been able to control through careful input conditions—the splitting of fluid drops. Both have a broad range of applications that will be briefly discussed, but more important is the underlying physics that illustrates the rich interaction of the acoustics, fluid dynamics, and free fluid interface in these systems.
Published Version
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