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Publication

Inkjet Printing of SU-8; A Case Study for Microlenses

Jürgen Brugger, Edoardo Charbon, Alcherio Martinoli, Vahid Fakhfouri, Grégory Mermoud, Joo Yeon Kim, Dmitri Boiko, Nicolas Jacques Joseph Marie Cantale
2008
Conference Papers

Abstract

This paper describes a novel method to fabricate polymer MEMS based on the inkjet printing of SU-8, with a special emphasis on integrated micro-optical lens arrays. Inkjet control parameters are optimized in order to enable a stable and reproducible ejection of SU-8 drops in both continuous and drop-on-demand (DOD) modes. Arbitrary patterns of single and multiple polymer drops and arrays of convex microlenses are printed on different substrates. The influence of surface wetting properties on the size and the shape of the printed patterns is investigated. The optical properties of the microlenses are investigated in details. A model for inkjet printing of high-viscous functional materials for polymer MEMS has been used.

Official source

https://infoscience.epfl.ch/entities/publication/e75be5b1-a3a3-43e9-b52a-e30178a1ffca

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Jürgen Brugger, Edoardo Charbon, Alcherio Martinoli, Vahid Fakhfouri, Grégory Mermoud, Joo Yeon Kim, Dmitri Boiko, Nicolas Jacques Joseph Marie Cantale
2008
Conference Papers

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/e75be5b1-a3a3-43e9-b52a-e30178a1ffca

About this result

Related concepts (21)

Surface energy

In surface science, surface free energy (also interfacial free energy or surface energy) quantifies the disruption of intermolecular bonds that occurs when a surface is created. In solid-state physics, surfaces must be intrinsically less energetically favorable than the bulk of the material (the atoms on the surface have more energy compared with the atoms in the bulk), otherwise there would be a driving force for surfaces to be created, removing the bulk of the material (see sublimation).

Wetting

Wetting is the ability of a liquid to maintain contact with a solid surface, resulting from intermolecular interactions when the two are brought together. This happens in presence of a gaseous phase or another liquid phase not miscible with the first one. The degree of wetting (wettability) is determined by a force balance between adhesive and cohesive forces. Wetting is important in the bonding or adherence of two materials. Wetting and the surface forces that control wetting are also responsible for other related effects, including capillary effects.

Surface tension

Surface tension is the tendency of liquid surfaces at rest to shrink into the minimum surface area possible. Surface tension is what allows objects with a higher density than water such as razor blades and insects (e.g. water striders) to float on a water surface without becoming even partly submerged. At liquid–air interfaces, surface tension results from the greater attraction of liquid molecules to each other (due to cohesion) than to the molecules in the air (due to adhesion). There are two primary mechanisms in play.

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