Dynamic superconcentration at critical-point double-layer gates of conducting nanoporous granules due to asymmetric tangential fluxes

Shau Chun Wang, Hsien Hung Wei, Hsiao Ping Chen, Min Hsuan Tsai, Chun Ching Yu, Hsueh Chia Chang

研究成果: Article同行評審

20 引文 斯高帕斯(Scopus)

摘要

A transient 106-fold concentration of double-layer counterions by a high-intensity electric field is demonstrated at the exit pole of a millimeter-sized conducting nanoporous granule that permits ion permeation. The phenomenon is attributed to a unique counterion screening dynamics that transforms half of the surface field into a converging one toward the ejecting pole. The resulting surface conduction flux then funnels a large upstream electro-osmotic convective counterion flux into the injecting hemisphere toward the zero-dimensional gate of the ejecting hemisphere to produce the superconcentration. As the concentrated counterion is ejected into the electroneutral bulk electrolyte, it attracts co-ions and produce a corresponding concentration of the co-ions. This mechanism is also shown to trap and concentrate co-ion microcolloids of micron sizes too (macroions) and hence has potential application in bead-based molecular assays.

原文English
文章編號014102
期刊Biomicrofluidics
2
發行號1
DOIs
出版狀態Published - 2008

All Science Journal Classification (ASJC) codes

  • 生物醫學工程
  • 材料科學(全部)
  • 凝聚態物理學
  • 流體流動和轉移過程
  • 膠體和表面化學

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