Journal
JOURNAL OF MICROMECHANICS AND MICROENGINEERING
Volume 19, Issue 9, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0960-1317/19/9/095016
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This paper describes casting-based microfabrication of metal microstructures and nanostructures. The metal was cast into flexible silicone molds which were themselves cast from microfabricated silicon templates. Microcasting is demonstrated in two metal alloys of melting temperature 70 degrees C or 138 degrees C. Many structures were successfully cast into the metal with excellent replication fidelity, including ridges with periodicity 400 nm and holes or pillars with diameter in the range 10-100 mu m and aspect ratio up to 2:1. The flexibility of the silicone mold permits casting of curved surfaces, which we demonstrate by fabricating a cylindrical metal roller of diameter 8 mm covered with microstructures. The metal microstructures can be in turn used as a reusable molding tool.
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