Studies on particle separation by acoustic radiation force and electrostatic force

Kenji Yasuda, Kazuo Takeda, Shin Ichiro Umemura

研究成果: Article査読

21 被引用数 (Scopus)


A method for separating particles in liquid by exploiting the competition between acoustic radiation force and electrostatic force has been investigated. To elucidate the size and charge dependence of the shift of the particles away from the sound pressure node, the effective charges of polystyrene spheres and alumina particles, which have opposite signs of electric charge on the surface, were measured for particles of various diameters. The shift of the particles from the pressure node due to the electrostatic force was also measured. Polystyrene spheres smaller than 10μm in diameter showed same mobility in a 1Hz, 13.4Vpp/mm alternating electric field, which indicates that the effective charge of the particle is directly proportional to the radius of the particle. Using 500kHz ultrasound and a 0.5V/mm electric field, 7μm polystyrene spheres and 10 μm alumina particles were shifted in opposite directions, according to the sign of the effective charge on the particles.

ジャーナルJapanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers
5 B
出版ステータスPublished - 1996

ASJC Scopus subject areas

  • 工学(全般)
  • 物理学および天文学(全般)


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