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Process Mechanism for Vacuum-Assisted Microfluidic Lithography with Ceramic Colloidal Suspensions

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The infiltration kinetics and the drying mechanism of suspensions involved in vacuum-assisted microfluidic lithography (FL) have been investigated for the fabrication of complex micropatterned ceramic structures. Infiltration lengths of alumina suspensions with various solid loadings into microchannels were analyzed as a function of channel widths ranging from 10 to 100 m. The use of well-dispersed ethanol-based suspensions with lower viscosities and wider channels allowed for easier and longer infiltration due to lower fluidic resistance in the channels. In contrast to the micromolding in capillaries (MIMIC) method, vacuum-assisted FL has a distinct drying mechanism in which there is a critical level of solid loading of the suspension with respect to the volume of the microchannel for the fabrication of a defect-free pattern structure.

Document Type: Research Article

DOI: http://dx.doi.org/10.1111/j.1551-2916.2008.02458.x

Affiliations: 1: Department of Materials Science and Engineering, Yonsei University, Seoul 120-749, Korea 2: Center for Energy Materials Research, Korea Institute of Science and Technology, Seoul 136-791, Korea

Publication date: July 1, 2008

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