Polyelectrolyte-modified short microchannel for cation separation |
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| Authors: | Bai Xiaoxia Roussel Christophe Jensen Henrik Girault Hubert H |
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| Institution: | Laboratoire d'Electrochimie Physique et Analytique, Institut de Chimie Moléculaire et Biologique, Ecole Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland. |
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| Abstract: | 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. |
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| Keywords: | Capillary electrophoresis Cation separation Microchannel Miniaturization Polyelectrolyte Surface modification |
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