Manipulation of biomimetic objects in acoustic levitation

Abstract : Levitation is a promising tool for contactless guiding and non-toxic manipulation. Acoustic levitation by ultrasonic standing waves (USW) allows micron-scale particle manipulation in acoustic resonators. The main goal of this thesis is to explore the possibilities given by the acoustic levitation for manipulating rigid and elastic particles, cells and even bacteria. Therefore we designed and built all the resonators we used and developed new methodologies we shall show in this experimental work. According to the particles nature, their displacement towards the node or the antinode is given by the interaction with the primary force. The position where particles move is a point where the acoustic and the gravitational forces are balanced. At the levitation plane, the first stage of the aggregation process is given by inter particles interactions known as the secondary Bjerknes force. We introduced a methodology for measuring this short range force. In addition, we measured this force in microgravity conditions. Usually, we dealt with hundreds or thousands of micron-size particles leading 3D aggregates. We introduce pulse mode acoustics, where we can generate homogeneous structures, 2D aggregates. However, when species smaller than 1µm particle manipulation is challenging due the complex influence of the acoustic streaming. Pulse mode acoustics can reduce or control the acoustic streaming leading applications to sub-micron size particles, bacteria and catalytic micro rods. A mixture of 7-12µm particles was separated in the s-SPLITT device. However the combination of hydrodynamic and the programmed acoustic of HACS device, improved the purity of the separation.
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https://pastel.archives-ouvertes.fr/pastel-00938546
Contributor : Angelica Castro <>
Submitted on : Wednesday, January 29, 2014 - 2:38:00 PM
Last modification on : Wednesday, May 15, 2019 - 3:39:00 AM
Long-term archiving on : Sunday, April 9, 2017 - 2:31:04 AM

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  • HAL Id : pastel-00938546, version 1

Citation

Angelica Castro. Manipulation of biomimetic objects in acoustic levitation. Acoustics [physics.class-ph]. Université Pierre et Marie Curie - Paris VI, 2013. English. ⟨pastel-00938546⟩

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