title: Microchip free-flow electrophoresis on glass substrate using laser-printing toner as structural material.
abstract: In this work, a microfluidic free-flow electrophoresis device, obtained by thermal toner transferring on glass substrate, is presented. A microdevice can be manufactured in only 1 h. The layout of the microdevice was designed in order to improve the fluidic and electrical characteristics. The separation channel is 8 microm deep and presents an internal volume of 1.42 microL. The deleterious electrolysis effects were overcome by using a system that isolates the electrolysis products from the separation channel. The Joule heating dissipation in the separation channel was found to be very efficient up to a current density of 8.83 mA/mm(2) that corresponds to a power dissipation per unit volume of running electrolyte of 172 mW/microL. Promising results were obtained in the evaluation of the microdevices for the separation of ionic dyes. The microfluidic device can be used for a continuous sample pretreatment step for micro total analysis system.
authors.affiliation: Departamento de Química Fundamental, Instituto de Química, Universidade de São Paulo, São Paulo, SP, Brazil.
authors.forename: Dosil
authors.initials: D
authors.lastname: Pereira de Jesus
authors.forename: Lucas
authors.initials: L
authors.lastname: Blanes
authors.forename: Claudimir Lucio
authors.initials: CL
authors.lastname: do Lago
mesh_terms: D046209:Electrophoresis, Microchip / Q000379:methods*; D005898:Glass; D008904:Miniaturization / Q000379:methods*