Streaming current measurements in zirconia-coated capillaries.
The electroosmotic flow created in zirconia-modified capillaries has been previously investigated. In this paper, we compared the electroosmotic data set with streaming current measurements and we related all these data through zeta-potential. Streaming current measurements give an excellent indication on the direction and the value of the electroosmotic mobility of an electrolyte/capillary system for a large set of experimental conditions: 2 < pH < 12, 0 < ACN < 80 %, 10(-4) M < [SO(2- )4 ] < 4 x 10(-2) M. A good correlation between zeta-potential from streaming current measurements and zeta-potential from electroosmotic mobility measurements was observed (r2 = 0.95). However, the values obtained from streaming current were always slightly lower than the one calculated from electroosmotic mobility (slope = 0.86, sigma = 0.06). In zirconia-coated capillaries the zeta-potential can be tuned from -50 to +100 mV depending on the composition of the electrolyte.
Laboratoire des Sciences et Stratégies Analytiques, Université Claude Bernard Lyon, Villeurbanne, France.
Myriam
M
Crosnier de Bellaistre
Louis
L
Renaud
Pascal
P
Kleimann
Pierre
P
Morin
Jérôme
J
Randon
Jean-Luis
JL
Rocca
D000097:Acetonitriles / Q000737:chemistry; D019075:Electrophoresis, Capillary / Q000295:instrumentation*; D009995:Osmosis; D011208:Powders; D015040:Zirconium / Q000737:chemistry*
D000097:Acetonitriles; D011208:Powders; D015040:Zirconium; C028541:zirconium oxide; C032159:acetonitrile