Ion flow crossing over a polyelectrolyte diode on a microfluidic chip

Ji Hyung Han, Kwang Bok Kim, Je Hyun Bae, Beom Jin Kim, Chung Mu Kang, Hee Chan Kim, Taek Dong Chung

Research output: Contribution to journalArticle

20 Scopus citations

Abstract

Key evidences are reported for the rectification mechanism of an aqueous ion diode based on polyelectrolytic plugs on a microfluidic chip by monitoring the ion flow crossing over the junction. The ion flow penetrating the polyelectrolyte junction is visualized by employing a fluorescent chemodosimeter, rhodamine B hydrazide and the pH-dependent dye, carboxy-fluorescein. How hysteresis phenomena, exhibited through the nonlinear behavior of the polyelectrolyte diode, are affected by a variety of parameters (e.g., switching potential, scan rate, and electrolyte concentration) is also investigated. The insights and knowledge from this study provide a crucial foundation for ion control at the iontronic diode in the aqueous phase, leading to more advanced aqueous organic computing devices and more diverse applications for microfluidic logic devices. The key evidences for the rectification mechanism of an aqueous ion diode based on polyelectrolytic plugs on a microfluidic chip are reported by monitoring the ion flow crossing over the junction. How hysteresis phenomena, exhibited through the nonlinear behavior of the polyelectrolyte diode, is affected by a variety of parameters (e.g., switching potential, scan rate, and electrolyte concentration) is also investigated.

Original languageEnglish
Pages (from-to)2629-2639
Number of pages11
JournalSmall
Volume7
Issue number18
DOIs
StatePublished - 19 Sep 2011

Keywords

  • diodes
  • microfluidics
  • penetration current
  • polyelectrolytes
  • rectification

Cite this

Han, J. H., Kim, K. B., Bae, J. H., Kim, B. J., Kang, C. M., Kim, H. C., & Chung, T. D. (2011). Ion flow crossing over a polyelectrolyte diode on a microfluidic chip. Small, 7(18), 2629-2639. https://doi.org/10.1002/smll.201100827