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Investigating Porous Media for Relief Printing Using Micro-Architected Materials

Advanced Engineering Materials

Kaehr, Bryan J.; Gallegos, Michael A.; Garcia, Chelsea M.; Secor, Ethan B.; Schunk, Randy; White, Benjamin C.; Boyce, Brad B.

Advances in printed electronics are predicated on the integration of sophisticated printing technologies with functional materials. Although scalable manufacturing methods, such as letterpress and flexographic printing, have significant history in graphic arts printing, functional applications require sophisticated control and understanding of nanoscale transfer of fluid inks. In this paper, a versatile platform is introduced to study and engineer printing forms, exploiting a microscale additive manufacturing process to design micro-architected materials with controllable porosity and deformation. Building on this technology, controlled ink transfer for submicron functional films is demonstrated. The design freedom and high-resolution 3D control afforded by this method provide a rich framework for studying mechanics of fluid transfer for advanced manufacturing processes.

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Elastohydrodynamics of Roll-to-Roll UV-Cure Imprint Lithography

Industrial and Engineering Chemistry Research

Schunk, Randy; Tjiptowidjojo, Kristianto; Cochrane, Andrew; Bonnecaze, Roger T.

The inextensible cylindrical shell theory and lubrication theory combine into a model for the elastohydrodynamics of a rolling-imprint modality of nanoimprint lithography (NIL). Foil-bearing theory describes the formation of the lubrication gap due to relative motion between a tensioned substrate and a rigid, cylindrical surface. Reproduction of the results of foil-bearing theory for both stiff and perfectly flexible substrates validates this coupled model and reveals a highly predictable region of uniformity that provides low shear stress conditions ideal for UV-cure. These results show theoretical limitations that are used to construct an operating window for predicting rolling-mode NIL process feasibility.

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Results 1–25 of 100
Results 1–25 of 100