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Binary mixtures of n-alkanes for tunable thermohydraulic microactuators
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microsystems Technology. (Microsystems Technology Group)
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microsystems Technology. (Microsystems Technology Group)
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microsystems Technology. (Microsystems Technology Group)
2007 (English)In: Journal of microelectromechanical systems, ISSN 1057-7157, E-ISSN 1941-0158, Vol. 16, no 3, 728-733 p.Article in journal (Refereed) Published
Abstract [en]

The two objectives of this paper are related to the use of n-alkanes in actuators. The first objective is to study the thermomechanics of binary mixtures of dotriacontane and hexatriacontane to see if a quasi-stable thermal expansion can be obtained, and the second one is to find the correspondence between dilatometry [pressure, volume, and temperature (pVT) measurement] and differential scanning calorimetry (DSC). Results show that there is indeed a concentration-dependent plateau in the expansion curves and that the width and horizontal position of this can be adjusted. As compared with pure n-alkanes, the plateaus of the mixtures widen by a factor of 2-4, and as compared with pure hexatriacontane, they shift their low-end temperatures by 5 °C to 10 °C, in the 25% to 75% concentration range. The mixtures' plateaus (gathered around 0.06 cm3/g) are about 0.02 cm3/g below those of the pure n-alkanes. It is shown that DSC can be used for a prediction of the thermomechanical properties of the substances, provided that a pVT reference exists, and the fact that the melting point increases with the pressure that is experienced with the dilatometer is considered. The qualitative similarity between the expansion and enthalpy curves is remarkable. About 25% to 30% of the total volume expansion is attributed to the solid-to-solid phase transition; the rest is attributed to thermal expansion and melting.

Place, publisher, year, edition, pages
2007. Vol. 16, no 3, 728-733 p.
Keyword [en]
Finite element method, Modelling, Similarity solution, Paraffin wax, Phase transformations, Low temperature, Calorimetry, Thermal expansion, Temperature measurement, Thermomechanical properties, Actuators, Microactuators, Microelectromechanical device
National Category
Engineering and Technology
URN: urn:nbn:se:uu:diva-96073DOI: 10.1109/JMEMS.2007.893516ISI: 000247219200027OAI: oai:DiVA.org:uu-96073DiVA: diva2:170532
Available from: 2007-09-03 Created: 2007-09-03 Last updated: 2011-02-09Bibliographically 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.
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 325
Engineering physics, Paraffin, Actuators, Valve, Micropump, Teknisk fysik
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
Available from: 2007-09-03 Created: 2007-09-03Bibliographically approved

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Schweitz, Jan-ÅkeThornell, Greger
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