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Polyelectrolyte‐modified short microchannel for cation separation
Author(s) -
Bai Xiaoxia,
Roussel Christophe,
Jensen Henrik,
Girault Hubert H.
Publication year - 2004
Publication title -
electrophoresis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.666
H-Index - 158
eISSN - 1522-2683
pISSN - 0173-0835
DOI - 10.1002/elps.200305771
Subject(s) - microchannel , potassium , sodium , polyelectrolyte , chemistry , lithium (medication) , alkali metal , electro osmosis , lithium chloride , polymer , resolution (logic) , chemical engineering , analytical chemistry (journal) , chemical physics , chromatography , inorganic chemistry , materials science , electrophoresis , nanotechnology , organic chemistry , medicine , endocrinology , artificial intelligence , computer science , engineering
Three alkali cations, potassium, sodium, and lithium, have been separated within 15 s in a 1 cm long polymer microchip. The separation microchannel is modified by a polycation, poly(allylammonium chloride), which makes the channel surfaces positively charged leading to a reversed electroosmotic flow (EOF) when compared to bare channels. Due to the decreased apparent mobility of the cations, the separation resolution is improved allowing the use of shorter channels.