title: Experimental study on inter-particle acoustic forces.
abstract: A method for the experimental measurement of inter-particle forces (secondary Bjerknes force) generated by the action of an acoustic field in a resonator micro-channel is presented. The acoustic radiation force created by an ultrasonic standing wave moves suspended particles towards the pressure nodes and the acoustic pressure induces particle volume oscillations. Once particles are in the levitation plane, transverse and secondary Bjerknes forces become important. Experiments were carried out in a resonator filled with a suspension composed of water and latex particles of different size (5-15 μm) at different concentrations. Ultrasound was generated by means of a 2.5 MHz nominal frequency transducer. For the first time the acoustic force generated by oscillating particles acting on other particles has been measured, and the critical interaction distance in various cases has been determined. Inter-particle forces on the order of 10(-14) N have been measured by using this method.
authors.affiliation: Departament de Física Aplicada, Universitat Politècnica de Catalunya-BarcelonaTech, c/E. Terradas 5, 08860 Castelldefels (Barcelona), Spain.
authors.forename: Anna
authors.initials: A
authors.lastname: Garcia-Sabaté
authors.affiliation: Ecole Supérieure de Physique et Chimie Industrielles (ParisTech), Laboratoire de Physique et Mécanique des Milieux Hétérogenes, Unités Mixtes de Recherche 7636 Centre National de la Recherche Scientifique, 10 Rue Vauquelin, 75231 Paris Cedex 05, France.
authors.forename: Angélica
authors.initials: A
authors.lastname: Castro
authors.affiliation: Ecole Supérieure de Physique et Chimie Industrielles (ParisTech), Laboratoire de Physique et Mécanique des Milieux Hétérogenes, Unités Mixtes de Recherche 7636 Centre National de la Recherche Scientifique, 10 Rue Vauquelin, 75231 Paris Cedex 05, France.
authors.forename: Mauricio
authors.initials: M
authors.lastname: Hoyos
authors.affiliation: Departament de Física Aplicada, Universitat Politècnica de Catalunya-BarcelonaTech, c/E. Terradas 5, 08860 Castelldefels (Barcelona), Spain.
authors.forename: Ricard
authors.initials: R
authors.lastname: González-Cinca
mesh_terms: D007840:Latex; D008863:Microspheres; D008962:Models, Theoretical; D009038:Motion; D010316:Particle Size; D011312:Pressure; D013016:Sound; D013997:Time Factors; D014159:Transducers; D014465:Ultrasonics / Q000295:instrumentation; D014732:Vibration; D014783:Viscosity; D014867:Water
chemical_list: D007840:Latex; D014867:Water