Micro magnetic stir-bar mixer integrated with parylene microfluidic channels

Kee Suk Ryu, Kashan Shaikh, Edgar Goluch, Zhifang Fan, Chang Liu*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

214 Scopus citations


Previously, we reported a micro magnetic stir-bar mixer driven by an external rotating magnetic field and its rapid mixing performance in polydimethyl-siloxane (PDMS) channels. The PDMS piece with embedded fluid channels were manually aligned to a glass substrate and assembled. In this paper, we report the fabrication and testing results of a micro magnetic stir-bar monolithically integrated in parylene surface-micromachined channels with improved design features, including small tolerance of the stir-bar to channel wall (10 μ). Using of parylene based microchannels with improved design not only provides improved mixing, but also eliminates certain problems associated with PDMS-based channels. For example, porosity of PDMS causes evaporation and absorption of chemicals and thus channels made of PDMS are prone to cross-contamination. We have also demonstrated that the magnetic stir-bar can be used to pump liquid in micro channels.

Original languageEnglish (US)
Pages (from-to)608-613
Number of pages6
JournalLab on a Chip
Issue number6
StatePublished - Dec 2004

ASJC Scopus subject areas

  • General Chemistry
  • Bioengineering
  • Biochemistry
  • Biomedical Engineering


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