Fabrication of PDMS micro through-holes using micromolding in open capillaries

A modified micromolding process in open capillaries (MIMIOC) is put forward to pattern PDMS through-hole layers. In addition, a transfer technique, which includes changing bonding strengths between each layer by oxygen plasma treatment and surface silanization, is introduced to facilitate the releas...

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Bibliographic Details
Published inRSC advances Vol. 4; no. 60; pp. 31988 - 31993
Main Authors Zhou, K., Zhu, X. G., Li, Y., Liu, J.
Format Journal Article
LanguageEnglish
Published 01.01.2014
Subjects
Arrays
Capillaries
Cylinders
Devices
Grooves
Micromolding
Patterning
Silicone resins
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Summary:A modified micromolding process in open capillaries (MIMIOC) is put forward to pattern PDMS through-hole layers. In addition, a transfer technique, which includes changing bonding strengths between each layer by oxygen plasma treatment and surface silanization, is introduced to facilitate the release and bonding of through-holes layers. Its performance is verified by fabricating PDMS through-holes on SU-8 molds with 50–200 μm microstructures of cube, cylinder and rounded rectangle arrays. The feasibility of the micromolding process and its ability to achieve a planar PDMS layer with protruding angle less than 2° is proved by changes of interfacial free energies and wetting morphology of liquid in micro grooves. As a method with simple structure and low requirements for the equipment, MIMIOC would contribute to the development of MEMS devices by patterning PDMS micro through-holes in a simple and low-cost way.
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ISSN:2046-2069
2046-2069
DOI:10.1039/C4RA02498B