title: Ion flow crossing over a polyelectrolyte diode on a microfluidic chip.
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.
authors.affiliation: Department of Chemistry, Seoul National University, Seoul, 151747, Korea.
authors.forename: Ji-Hyung
authors.initials: JH
authors.lastname: Han
authors.forename: Kwang Bok
authors.initials: KB
authors.lastname: Kim
authors.forename: Je Hyun
authors.initials: JH
authors.lastname: Bae
authors.forename: Beom Jin
authors.initials: BJ
authors.lastname: Kim
authors.forename: Chung Mu
authors.initials: CM
authors.lastname: Kang
authors.forename: Hee Chan
authors.initials: HC
authors.lastname: Kim
authors.forename: Taek Dong
authors.initials: TD
authors.lastname: Chung
mesh_terms: D004573:Electrolytes / Q000737:chemistry*; D005452:Fluoresceins / Q000737:chemistry; D005456:Fluorescent Dyes; D006834:Hydrazines / Q000737:chemistry; D006863:Hydrogen-Ion Concentration; D007477:Ions / Q000737:chemistry; D046210:Microfluidic Analytical Techniques / Q000295:instrumentation*; D012235:Rhodamines / Q000737:chemistry
chemical_list: D004573:Electrolytes; D005452:Fluoresceins; D005456:Fluorescent Dyes; D006834:Hydrazines; D007477:Ions; D012235:Rhodamines; C543681:rhodamine B hydrazide; C024098:6-carboxyfluorescein