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Spatial confinement of ultrasonic force fields in microfluidic chips
KTH, School of Engineering Sciences (SCI), Applied Physics. (Biomedical & X-Ray Physics)ORCID iD: 0000-0002-4720-2756
(MIC)
KTH, School of Engineering Sciences (SCI), Applied Physics. (Biomedical & X-Ray Physics)
KTH, School of Engineering Sciences (SCI), Applied Physics. (Biomedical & X-Ray Physics)ORCID iD: 0000-0003-2723-6622
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2009 (English)In: Ultrasonics, ISSN 0041-624X, E-ISSN 1874-9968, Vol. 49, 112-119 p.Article in journal (Refereed) Published
Abstract [en]

We demonstrate and investigate multiple localized ultrasonic manipulation functions in series in microfluidic chips. The manipulation functions are based on spatially separated and confined ultrasonic primary radiation force fields, obtained by local matching of the resonance condition of the microfluidic channel. The channel segments are remotely actuated by the use of frequency-specific external transducers with refracting wedges placed on top of the chips. The force field in each channel segment is characterized by the use of micrometer-resolution particle image velocimetry ( micro-PIV). The confinement of the ultrasonic fields during single-or dual-segment actuation, as well as the cross-talk between two adjacent. fields, is characterized and quantified. Our results show that the field confinement typically scales with the acoustic wavelength, and that the cross-talk is insignificant between adjacent. fields. The goal is to define design strategies for implementing several spatially separated ultrasonic manipulation functions in series for use in advanced particle or cell handling and processing applications. One such proof-of-concept application is demonstrated, where. flow-through-mode operation of a chip with. flow splitting elements is used for two-dimensional pre-alignment and addressable merging of particle tracks.

Place, publisher, year, edition, pages
2009. Vol. 49, 112-119 p.
Keyword [en]
Ultrasonic manipulation; Acoustic radiation force; Microfluidic chip; Particle image velocimetry; Spatial confinement; Cell handling
National Category
Industrial Biotechnology
Identifiers
URN: urn:nbn:se:kth:diva-10912DOI: 10.1016/j.ultras.2008.06.012ISI: 000261834200017Scopus ID: 2-s2.0-56949083339OAI: oai:DiVA.org:kth-10912DiVA: diva2:231804
Note
QC 20100730Available from: 2009-08-18 Created: 2009-08-18 Last updated: 2017-12-13Bibliographically approved
In thesis
1. Multidimensional Ultrasonic Standing Wave Manipulation in Microfluidic Chips
Open this publication in new window or tab >>Multidimensional Ultrasonic Standing Wave Manipulation in Microfluidic Chips
2009 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The use of ultrasonic standing waves for contactless manipulation of microparticles in microfluidic systems is a field with potential to become a new standard tool in lab-on-chip systems. Compared to other contactless manipulation methods ultrasonic standing wave manipulation shows promises of gentle cell handling, low cost, and precise temperature control. The technology can be used both for batch handling, such as sorting and aggregation, and handling of single particles.

This doctoral Thesis presents multi-dimensional ultrasonic manipulation, i.e., manipulation in both two and three spatial dimensions as well as time-dependent manipulation of living cells and microbeads in microfluidic systems. The lab-on-chip structures used allow for high-quality optical microscopy, which is central to many bio-applications. It is demonstrated how the ultrasonic force fields can be spatially confined to predefined regions in the system, enabling sequential manipulation functions. Furthermore, it is shown how frequency-modulated signals can be used both for spatial stabilization of the force fields as well as for flow-free transport of particles in a microchannel. Design parameters of the chip-transducer systems employed are investigated experimentally as well as by numerical simulations. It is shown that three-dimensional resonances in the solid structure of the chip strongly influences the resonance shaping in the channel.

Place, publisher, year, edition, pages
Stockholm: KTH, 2009. ix, 83 p.
Series
Trita-FYS, ISSN 0280-316X ; 2009:44
National Category
Condensed Matter Physics
Identifiers
urn:nbn:se:kth:diva-10919 (URN)978-91-7415-398-9 (ISBN)
Public defence
2009-09-11, FD5, Roslagstullsbacken 21, Stockholm, 14:00 (English)
Opponent
Supervisors
Note
QC 20100730Available from: 2009-09-01 Created: 2009-08-18 Last updated: 2010-07-30Bibliographically approved
2. Ultrasonic Handling of Living Cells in Microfluidic Systems
Open this publication in new window or tab >>Ultrasonic Handling of Living Cells in Microfluidic Systems
2009 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Microfluidic chips have become a powerful tool in research where biological cells are processed and/or analyzed. One method for contactless cell manipulation in microfluidic chips that has gained an increasing amount of attention the last decade is ultrasonic standing wave (USW) technology. This Thesis explores the biocompatibility of USW technology applied to microfluidic chips, and presents a novel USW-based method for serial processing and accurate characterization of living cells.

The biocompatibility has been investigated by measuring the proliferation rate of cells after they had been trapped and aggregated inside a chip by ultrasound. No negative influence was observed after continuous exposure to 0.85 MPa pressure amplitudes for up to 75 min. Furthermore, the heat generation in the fluid channel caused by the ultrasound has been measured and used in a regulation scheme where the temperature can be controlled around any relevant temperature (e.g. 37‰) with ±0.1‰ accuracy for more than 12 hours. The proliferation rate and temperature investigations suggest that USW technology applied to microfluidic chips is a biocompatiblemethod useful for long-term handling of living cells.

We have introduced a new concept of contactless ultrasonic ”caging” of single cells or small aggregates of cells. These cages are channel segments in the microfluidic chips that are geometrically designed to resonate at one or several actuation frequencies. The actuation is performed remotely by up to five external frequency specific wedge transducers, where each transducer produces a localized and spatially confined standing wave with a specific orientation of its corresponding radiation force field. By multi-frequency actuation, sophisticated and flexible force fields are realized by both overlapping and separated single fields. The Thesis describes two different cages: A sub-mm ”micro-cage” for tree-dimensional manipulationof single cells, and a 5-mm ”mini-cage” for selective retention of small cell aggregates (up to approx. 10^3 cells) from a continuously feeding sample flow. Finally,our microfluidic chips were also designed to be compatible with high-resolution optical microscopy. We have demonstrated sub-μm-resolution confocal fluorescence and trans-illumination microscopy imaging of ultrasonically caged living cells.

Place, publisher, year, edition, pages
Stockholm: KTH, 2009. xi, 53 p.
Series
Trita-FYS, ISSN 0280-316X ; 2009:56
National Category
Industrial Biotechnology
Identifiers
urn:nbn:se:kth:diva-11500 (URN)978-91-7415-466-5 (ISBN)
Public defence
2009-11-27, FB42, Roslagstullsbacken 21, AlbaNova Universitetscentrum, Kungliga Tekniska Högskolan., Stockholm., 10:00 (English)
Opponent
Supervisors
Note
QC 20100811Available from: 2009-11-17 Created: 2009-11-17 Last updated: 2011-10-04Bibliographically approved

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Manneberg, OttoHertz, Hans M.

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