Bai, X.Roussel, C.Jensen, H.Girault, H. H.2005-11-072005-11-072005-11-07200410.1002/elps.200305771https://infoscience.epfl.ch/handle/20.500.14299/219401WOS:000220347900023Three 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.text::journal::journal article::research article