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Rapid prototyping of a polymeric paraffin microactuator
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microsystems Technology.
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microsystems Technology.
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microsystems Technology.
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2008 (English)In: Journal of microelectromechanical systems, ISSN 1057-7157, E-ISSN 1941-0158, Vol. 17, no 5, 1172-1177 p.Article in journal (Refereed) Published
Abstract [en]

Paraffin wax is a promising material in microactuators not only because of its ability of producing large displacements and high forces at the same time but also because of the variety of manufacturing techniques available. In this paper, a simple actuator based on paraffin wax as the active material is fabricated and tested. Ultraviolet-curable epoxy is used in a technique combining simultaneous moulding and liquid-phase photopolymerization in a single-process step to build the stiff part of the actuator body. A heater is integrated in the paraffin reservoir, and a polyimide tape is used as the deflecting membrane. Thermomechanical analysis of the paraffin wax shows that it exhibits a volume expansion of 10%, including phase transitions and linear expansion. As for the actuator, a stroke of 90 mum is obtained for the unloaded device, whereas 37 mum is recorded with a 0.5-N contact load at a driving voltage of 0.71 V and a frequency of 1/32 Hz. The actuator can be used in microsystems, where both large strokes and forces are needed. The low-cost materials and low driving voltage also makes it suitable for disposable systems.

Place, publisher, year, edition, pages
2008. Vol. 17, no 5, 1172-1177 p.
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:uu:diva-96074DOI: 10.1109/JMEMS.2008.927034ISI: 000260464800012OAI: oai:DiVA.org:uu-96074DiVA: diva2:170533
Available from: 2007-09-03 Created: 2007-09-03 Last updated: 2017-12-14Bibliographically approved
In thesis
1. Paraffin Actuators in Microfluidic Systems
Open this publication in new window or tab >>Paraffin Actuators in Microfluidic Systems
2007 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

There is a need for reliable valves and pumps in microfluidics. A good microactuator is the key for low cost and high performance of these components.

Paraffin wax is a promising material to be used as actuator material as is can produce large forces and large strokes. Further, the material is inexpensive and, none the less, the thermal heating of the material can be made with low voltages. All these properties are of interest in flow control components in microfluidics, and especially for disposables and in potable systems.

In this work, paraffin wax has been used in devices and concepts. A valve for high-pressures, a peristaltic pump, a multi-stable actuator, and injector has been shown. A material study was performed on binary mixtures of pure paraffin (n-alkanes), and a concept for loading fluid into a sealed reservoir was shown as well. Several injectors were demonstrated in a Lab-on-a-chip system with other microfluidic components.

High pressure applications in microfluidics along with the multi-stable actuator show good potential. However, the drive and control has to be further developed.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2007. 44 p.
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 325
Keyword
Engineering physics, Paraffin, Actuators, Valve, Micropump, Teknisk fysik
Identifiers
urn:nbn:se:uu:diva-8165 (URN)978-91-554-6942-9 (ISBN)
Public defence
2007-09-21, Siegbahnsalen, Ångströmlaboratoriet, Lägerhyddsvägen 1, Uppsala, 10:15
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Supervisors
Available from: 2007-09-03 Created: 2007-09-03Bibliographically approved

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Bodén, RogerHjort, KlasThornell, GregerSchweitz, Jan-Åke

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