Measurement of electroosmotic and electrophoretic velocities using pulsed and sinusoidal electric fields.

ABSTRACT: In this work, we explore two methods to simultaneously measure the electroosmotic mobility in microchannels and the electrophoretic mobility of micron-sized tracer particles. The first method is based on imposing a pulsed electric field, which allows to isolate electrophoresis and electroosmosis at the startup and shutdown of the pulse, respectively. In the second method, a sinusoidal electric field is generated and the mobilities are found by minimizing the difference between the measured velocity of tracer particles and the velocity computed from an analytical expression. Both methods produced consistent results using polydimethylsiloxane microchannels and polystyrene micro-particles, provided that the temporal resolution of the particle tracking velocimetry technique used to compute the

SUBMITTER: Sadek SH 

PROVIDER: S-EPMC5396373 | biostudies-literature | 2017 Apr

REPOSITORIES: biostudies-literature