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Desktop microfabrication: initial experiments with a piezoceramic
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Materials Science.
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Materials Science.
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1999 (English)In: Journal of Micromechanics and Microengineering, ISSN 0960-1317, E-ISSN 1361-6439, Vol. 9, no 4, 434-437 p.Article in journal (Refereed) Published
Abstract [en]

A method for building microstructures from a suspension of micrometre-sized piezoelectric particles by depositing droplets on top of droplets and promoting drying is devised. A micromachined dispensing unit similar to a drop-on-demand inkjet-printer head is used. The relation of the vertical building rate to the ejection frequency and the substrate temperature is established, and a mechanism explaining the tubular structures built is proposed.

Place, publisher, year, edition, pages
1999. Vol. 9, no 4, 434-437 p.
National Category
Engineering and Technology
URN: urn:nbn:se:uu:diva-89911DOI: 10.1088/0960-1317/9/4/322OAI: oai:DiVA.org:uu-89911DiVA: diva2:161771
Available from: 2002-05-16 Created: 2002-05-16 Last updated: 2013-05-30Bibliographically approved
In thesis
1. Miniature Phase-Transistion Actuators
Open this publication in new window or tab >>Miniature Phase-Transistion Actuators
2002 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Clearly, there is a need for simple, strong actuators capable of large strokes in miniaturized systems such as valves and optical shutters.

The basis for this work is the microstructure technology with processing techniques adopted from the integrated circuit industry. In many cases alternative techniques have been developed to obtain features not achievable with conventional silicon technology. Techniques to fabricate thermally activated phase transition actuators capable of large strokes, as well as strong, piezoceramic actuators, have been investigated

Multilayered piezoceramic actuators have been fabricated and used in a miniature linear motor. A technique to build freestanding, three-dimensional structures drop by drop using a micromachined ink jet head and a slurry of piezoceramic particles has been developed. Ion track technology was used to create narrow pores in polyimide. To make bimorph-like structures capable of large strokes, these pores were impregnated with paraffin- a material with a large volume expansion associated with its solid-to-liquid phase transition. Paraffin was used in a silicon thermal switch intended for a passive thermal control system, and in a device to be used as a valve in a gas regulation system. Finally, paraffin actuators for integration in thermoplastic microfluidic systems have been developed.

During the course of this work not only the importance of identifying the best materials for a given application has been addressed and acknowledged, but also that of finding a processing route on occasion far from the conventional one, and perhaps most important, that of anticipating the often surprising effects following from miniaturization.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2002. 28 p.
Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1104-232X ; 728
Materials science, Materialvetenskap
National Category
Materials Engineering
Research subject
Materials Science
urn:nbn:se:uu:diva-2138 (URN)91-554-5345-7 (ISBN)
Public defence
2002-06-06, Ångströmslaboratoriet 2002, Uppsala, 09:30
Available from: 2002-05-16 Created: 2002-05-16Bibliographically approved

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Thornell, GregerKlintberg, LenaJohansson, Stefan
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