[Zurück]

J.J. Hawkes, M. Gröschl, E. Benes, H. Nowotny, W.T. Coakley:
"Positioning particles within liquids using ultrasound force fields";
in: "Proc. Forum Acusticum 2002", A. Calvo-Manzano, A. Pérez-López, J.S. Santiago (Hrg.); Sociedad Española de Acústica, Madrid, Sevilla/Spain, 2002, (eingeladen), ISBN: 84-87985-06-8, Paper-Nr. PHA-01007, 6 S.

Ultrasound standing wave radiation acts on suspensions, emulsions, and colloids to drive the
dispersed particles (solid particles, bubbles, or oil droplets) towards either nodal or anti-nodal
positions in the sound field. Using narrow chambers which contain only one nodal plane we
have been able to position this pressure node at: 1) The reflector side wall of a chamber, this
has been used to draw cells to a surface for detection by a biosensor. 2) The centre of the
chamber, this has been combined with manipulation by laminar flow to produce a filter to
remove contaminating particles. These systems have been developed using a one-dimensional
transfer matrix model to predict the node positions and the acoustic energy density in the fluid.
The model has been further used to predict chamber designs in which pressure nodes are at 1)
the transducer side wall of the chamber and 2) both walls of the chamber.