“…Trapping of objects by means of acoustic forces is used in various areas such as chemistry [1], bioreactors [2,3], blood analysis [4], study of organisms in microgravity [2,5], control of nano material self-assembly [6], containerless processing [7][8][9], and to study droplet dynamics [10,11]. The main advantages of acoustic levitation over other methods, such as magnetic levitation [12], are its independence of the material properties of the object and its passive stability.…”