Surface tension-induced high aspect-ratio PDMS micropillars with concave and convex lens tips

Huawei Li, Yiqiang Fan, Ying Yi, Ian G. Foulds

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

This paper reports a novel method for the fabrication of 3-dimensional (3D) Polydimethylsiloxane (PDMS) micropillars with concave and convex lens tips in a one-step molding process, using a CO2 laser-machined Poly(methyl methacrylate) (PMMA) mold with through holes. The PDMS micropillars are 4 mm high and have an aspect ratio of 251. The micropillars are formed by capillary force drawing up PDMS into the through hole mold. The concave and convex lens tips of the PDMS cylindrical micropillars are induced by surface tension and are controllable by changing the surface wetting properties of the through holes in the PMMA mold. This technique eliminates the requirements of expensive and complicated facilities to prepare a 3D mold, and it provides a simple and rapid method to fabricate 3D PDMS micropillars with controllable dimensions and tip shapes. © 2013 IEEE.
Original languageEnglish (US)
Title of host publicationThe 8th Annual IEEE International Conference on Nano/Micro Engineered and Molecular Systems
PublisherInstitute of Electrical and Electronics Engineers (IEEE)
Pages187-190
Number of pages4
ISBN (Print)9781467363525
DOIs
StatePublished - Apr 2013

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