Electrophoretic effects of the adsorption of anionic surfactants to Poly(dimethylsiloxane)-coated capillaries

MARIA F. MORA; CARLA EUGENIA GIACOMELLI; CARLOS D. GARCÍA

American Chemical Society

Año: 2007 vol. 79 p. 6675 - 6675

b> Poly(dimethylsiloxane) (PDMS) is one of the most convenient materials to construct capillary electrophoresis microchips. Even though PDMS has many advantages, its use is often limited by its hydrophobicity. Although it is well-known that the surface properties of PDMS can be modified by anionic surfactants, very little is known regarding the driving forces or the electrophoretic consequences of the adsorption of anionic surfactants. In this work, the adsorption of alkyl surfactants on PDMS was studied by performing electroosmotic flow (íEOF) measurements. In order to mimic the behavior of PDMS microchannels, fused-silica capillaries were coated with PDMS and used for the í