Acoustic Standing Wave Manipulation of Particles and Cells in Microfluidic Chips
Lenshof, Andreas LU
(2009)
- Abstract
- The rise of MEMS and µTAS techniques has created a whole new family of microfluidic devices for a wide range of chemical and biomedical analyses to be performed on small Lab-on-a-chip platforms. The operations often include small samples of particle or cell suspensions on which separation, mixing, trapping or sorting is performed. External fields and forces are used for these operations, and this thesis is specifically focused the development of ultrasonic standing wave technology and the use of acoustic force fields to perform bioanalytical unit operations.
The combination of acoustic standing waves and the laminar flow in microfluidics has proven to be well suited for performing particle and cell separation. The fundamental... (More) - The rise of MEMS and µTAS techniques has created a whole new family of microfluidic devices for a wide range of chemical and biomedical analyses to be performed on small Lab-on-a-chip platforms. The operations often include small samples of particle or cell suspensions on which separation, mixing, trapping or sorting is performed. External fields and forces are used for these operations, and this thesis is specifically focused the development of ultrasonic standing wave technology and the use of acoustic force fields to perform bioanalytical unit operations.
The combination of acoustic standing waves and the laminar flow in microfluidics has proven to be well suited for performing particle and cell separation. The fundamental acoustic separator used in this thesis consists of a microfluidic flow channel with a three way flow splitter (trifurcation) in the end of the channel. An acoustic standing wave field is applied to the main flow channel by attaching the transducer underneath the chip. The acoustic standing wave is however obtained perpendicular to the axial propagation of the wave field and the direction of the flow. The half wavelength resonance affects rigid particles or cells driving them into the acoustic pressure node while liquid spheres having other density and compressibility properties may move to the pressure antinode. This enables acoustic separation of different particle types. Blood has proven to be very suitable for acoustic cell manipulation. An application where lipid particles can be removed acoustically from shed blood from open heart surgery is demonstrated. An application for acoustic plasmapheresis is also shown where high quality blood plasma is generated. Different separator designs, device material, and the influence of the separation channel cross-section design are also investigated. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/1275328
- author
- Lenshof, Andreas
LU
- supervisor
- opponent
-
- Dr Pamme, Nicole, Dept. of Chemistry, University of Hull, Hull, United Kingdom
- organization
- publishing date
- 2009
- type
- Thesis
- publication status
- published
- subject
- keywords
- acoustic particle manipulation, separation, ultrasound, cell handling, particle handling, lab on a chip, Microsystem technology, microfluidics, standing waves
- pages
- 146 pages
- publisher
- Lund University
- defense location
- Room E:1406, E-building, John Erikssons väg 4, Lund University, Faculty of Engineering
- defense date
- 2009-01-30 10:15:00
- ISBN
- 978-91-628-7678-4
- language
- English
- LU publication?
- yes
- id
- 742c4fbe-0a76-4261-aaee-cf3c66e82b7f (old id 1275328)
- date added to LUP
- 2016-04-01 13:19:17
- date last changed
- 2018-11-21 20:14:52
@phdthesis{742c4fbe-0a76-4261-aaee-cf3c66e82b7f,
abstract = {{The rise of MEMS and µTAS techniques has created a whole new family of microfluidic devices for a wide range of chemical and biomedical analyses to be performed on small Lab-on-a-chip platforms. The operations often include small samples of particle or cell suspensions on which separation, mixing, trapping or sorting is performed. External fields and forces are used for these operations, and this thesis is specifically focused the development of ultrasonic standing wave technology and the use of acoustic force fields to perform bioanalytical unit operations.<br/><br>
The combination of acoustic standing waves and the laminar flow in microfluidics has proven to be well suited for performing particle and cell separation. The fundamental acoustic separator used in this thesis consists of a microfluidic flow channel with a three way flow splitter (trifurcation) in the end of the channel. An acoustic standing wave field is applied to the main flow channel by attaching the transducer underneath the chip. The acoustic standing wave is however obtained perpendicular to the axial propagation of the wave field and the direction of the flow. The half wavelength resonance affects rigid particles or cells driving them into the acoustic pressure node while liquid spheres having other density and compressibility properties may move to the pressure antinode. This enables acoustic separation of different particle types. Blood has proven to be very suitable for acoustic cell manipulation. An application where lipid particles can be removed acoustically from shed blood from open heart surgery is demonstrated. An application for acoustic plasmapheresis is also shown where high quality blood plasma is generated. Different separator designs, device material, and the influence of the separation channel cross-section design are also investigated.}},
author = {{Lenshof, Andreas}},
isbn = {{978-91-628-7678-4}},
keywords = {{acoustic particle manipulation; separation; ultrasound; cell handling; particle handling; lab on a chip; Microsystem technology; microfluidics; standing waves}},
language = {{eng}},
publisher = {{Lund University}},
school = {{Lund University}},
title = {{Acoustic Standing Wave Manipulation of Particles and Cells in Microfluidic Chips}},
url = {{https://lup.lub.lu.se/search/files/3299910/1275329.pdf}},
year = {{2009}},
}