Polyelectrolyte-modified short microchannel for cation separation.
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.
Laboratoire d'Electrochimie Physique et Analytique, Institut de Chimie Moléculaire et Biologique, Ecole Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland.
Xiaoxia
X
Bai
Christophe
C
Roussel
Henrik
H
Jensen
Hubert H
HH
Girault
D002412:Cations / Q000737:chemistry / Q000302:isolation & purification*; D004573:Electrolytes / Q000737:chemistry; D019075:Electrophoresis, Capillary / Q000295:instrumentation* / Q000379:methods*; D008094:Lithium / Q000737:chemistry / Q000302:isolation & purification; D008672:Metals, Alkali / Q000737:chemistry / Q000302:isolation & purification*; D008904:Miniaturization; D011188:Potassium / Q000737:chemistry / Q000302:isolation & purification; D012964:Sodium / Q000737:chemistry / Q000302:isolation & purification
D002412:Cations; D004573:Electrolytes; D008672:Metals, Alkali; D008094:Lithium; D012964:Sodium; D011188:Potassium