Acoustic ejection is a way to displace small amounts of fluid using an ultrasound pulse impinging on a liquid-air interface. The deformation of the liquid is caused by a period-averaged force called acoustic radiation force (ARF) that is exerted on the liquid-air surface. We seek to extend the idea of acoustic ejection to two liquids in a dual-liquid-air system which would allow the creation of core-shell/sheath structures (droplets/jets). The resulting ARF in dual-liquid interface is weak compared to liquid-air interface. However, due to the strong deformation of the additional top-liquid-air interface, we expect the bottom liquid to be drawn with the flow of the top liquid. Two immiscible liquids are layered on top of each other and a focused ultrasound pulse is used to eject the liquids. The energy of the ultrasound pulse and the thickness of the top layer are varied. The ejections are imaged with a camera. The results show a successful ejection of both liquids. During the ejection the bottom liquid is seemingly pulled towards the top due to the deformation of the top liquid.
