Fabrication of 3D high aspect ratio PDMS microfluidic networks with a hybrid stamp

Yu Chun Kung, Kuo Wei Huang, Yu Jui Fan, Pei Yu Chiou

研究成果: 雜誌貢獻文章同行評審

38 引文 斯高帕斯(Scopus)

摘要

We report a novel methodology for fabricating large-area, multilayer, thin-film, high aspect ratio, 3D microfluidic structures with through-layer vias and open channels that can be bonded between hard substrates. It is realized by utilizing a hybrid stamp with a thin plastic sheet embedded underneath a PDMS surface. This hybrid stamp solves an important edge protrusion issue during PDMS molding while maintaining necessary stamp elasticity to ensure the removal of PDMS residues at through-layer regions. Removing edge protrusion is a significant progress toward fabricating 3D structures since high aspect ratio PDMS structures with flat interfaces can be realized to facilitate multilayer stacking and bonding to hard substrates. Our method also allows for the fabrication of 3D deformable channels, which can lead to profound applications in electrokinetics, optofluidics, inertial microfluidics, and other fields where the shape of the channel cross section plays a key role in device physics. To demonstrate, as an example, we have fabricated a microfluidic channel by sandwiching two 20 μm wide, 80 μm tall PDMS membranes between two featureless ITO glass substrates. By applying electrical bias to the two ITO substrates and pressure to deform the thin membrane sidewalls, strong electric field enhancement can be generated in the center of a channel to enable 3D sheathless dielectrophoretic focusing of biological objects including mammalian cells and bacteria at a flow speed up to 14 cm s-1.
原文英語
頁(從 - 到)1861-1868
頁數8
期刊Lab on a Chip - Miniaturisation for Chemistry and Biology
15
發行號8
DOIs
出版狀態已發佈 - 四月 21 2015
對外發佈

ASJC Scopus subject areas

  • 生物化學
  • 化學 (全部)
  • 生物工程
  • 生物醫學工程
  • 醫藥 (全部)

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