Non-contact Manipulation of Micro-Particles by Standing Acoustic Waves
Date Issued
2009
Date
2009
Author(s)
Lin, Chih-Hua
Abstract
A particle manipulation system using ultrasonic standing wave has been constructed for manipulating micro particles under microscopy. The system consists of a piezoelectric transducer with an angle-variable ultrasonic guiding block, rectangle micro-channel, and an optical microscope with a CCD video recorder.A micro-channel in this system is constructed with a rectangle capillary (0.70*0.7 mm) about 15 mm in length lodged in a flat piece of aluminum (120mm×80mm×1mm). A glass slide was placed upon the flat piece of aluminum with a micro-channel to be an ultrasound transmission element. UV light curing adhesive was then utilized to solidify above three components. The guiding block made of an aluminum cylinder wedge was attached with the glass slide with various angles to the surface normal by ultrasonic conductive gel.The 1.75 MHz of ultrasound transducer was powered with AC 24V to induce a standing wave in the flow channel. The micro-channel chip was obliquely coupled an ultrasonic transducer consisting of a piezoelectric transducer attached by ultrasonic conductive gel to an aluminum wedge with an angle, θof 51° relative to its surface normal, in order to efficiently drive a ultrasonic standing wave into the fluid channel via wave refraction. Micro particles of polystyrene (1~20 μm) were effectively aligned to the center line of a micro-channel by radiation force of the ultrasonic standing wave.
Subjects
Ultrasound
Manipulation
Standing wave
Micro particles
Type
thesis
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