ABSTRACT
These techniques involve manipulation of particles in the host medium in one form or another. For separation studies, the dynamics of the particles must be so manipulated as to bring them together, thereby "squeezing out" the interparticle fluid matrix. On the other hand, studies of the particles in their host environments mean studying them in suspension and are usually accomplished by "levitating" them, that is, by striking a balance between sundry forces acting on the particles. Whether by separation or by levitation, motion
of the particles in suspension must be manipulated. A relatively new mechanism for accomplishing this is through the utilization of what is termed "radiation force." This chapter is concerned with particle manipulation in acoustic fields utilizing acoustic radiation force. In addition, the frequencies of interest here are in the range 1 to 10 MHz. More specifically, then, we are discussing particle manipulation in host environments by ultrasonic radiation force.
