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Fluid streaming above interdigitated electrodes in dielectrophoresis experiments
Author(s) -
Stanke Sandra,
Bier Frank. F.,
Hölzel Ralph
Publication year - 2011
Publication title -
electrophoresis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.666
H-Index - 158
eISSN - 1522-2683
pISSN - 0173-0835
DOI - 10.1002/elps.201100096
Subject(s) - dielectrophoresis , electrode , microelectrode , electrokinetic phenomena , materials science , fluid dynamics , streaming current , fluorescence , current (fluid) , microfluidics , analytical chemistry (journal) , optoelectronics , nanotechnology , optics , chemistry , electrical engineering , physics , chromatography , mechanics , engineering
For the investigation of alternating current electrokinetic effects, a system is presented that allows for the simultaneous observation of fluid flow above and around microelectrodes in all three directions in space. Beside the usual microscopical view from top, lateral observation through the same objective is made possible by two small mirrors that are placed next to the electrodes. Fluid flow and movement of fluorescent nanoparticles above interdigitated electrodes are monitored by fluorescence microscopy and digital imaging and are further analysed by image processing. Field frequencies are varied from 10 Hz to 1 GHz at up to 10 V rms . Electrical conductivity of the fluid is monitored in situ in the actual measuring chamber.