Diffusion of Solvent in PDMS Elastomer for Micromolding in Capillaries
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- 作者：Paul C. Duineveld ; Marilla Lilja ; Tomas Johansson ; and Olle Inganä ; s
- 刊名：Langmuir
- 出版年：2002
- 出版时间：November 26, 2002
- 年：2002
- 卷：18
- 期：24
- 页码：9554 - 9559
- 全文大小：82K
- 年卷期：v.18,no.24(November 26, 2002)
- ISSN：1520-5827
文摘
Micromolding in capillaries is a soft lithography method for patterning materials. We have studied thediffusion of solvent from the excavated microsized channels in the stamp into the PDMS material, boththeoretically and experimentally. It was demonstrated that a model of 1-D diffusion of solvent througha PDMS stamp, coupled with a mass conservation of the solvent in the channels, leads to a quantitativelyaccurate model for the velocity of the boundary between liquid-filled and vapor-filled microchannels in thestamp. With the model the diffusion coefficient of the solvent into PDMS was successfully determined.