کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10410313 | 894424 | 2005 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Electro-osmotic pumping on application of phase-shifted signals to interdigitated electrodes
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی آنالیزی یا شیمی تجزیه
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چکیده انگلیسی
Alternating-current (ac) electro-osmotic flow can be implemented in microfluidic pumping systems with the advantage over conventional electro-osmosis that it requires low applied potentials that can be supplied by normal batteries so that it is highly suitable for use in portable lab-on-a-chip systems. We report how the combination of applying phase shifted signals to the interdigitated electrodes and the use of a ground layer causes ac electro-osmotic flow of aqueous electrolytes. The direction of pumping may be changed by varying the phase difference. Velocities up to 100âμ m/s were observed for applied potentials of less than 1âVrms. The maximum velocity was observed at phase differences of around ±90°. How surface conductivity affects ac electro-osmosis can be inferred from the effect of varying electrolyte concentration on the frequency of peak velocity.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Sensors and Actuators B: Chemical - Volume 110, Issue 1, 30 September 2005, Pages 157-163
Journal: Sensors and Actuators B: Chemical - Volume 110, Issue 1, 30 September 2005, Pages 157-163
نویسندگان
Brian P. Cahill, Laura J. Heyderman, Jens Gobrecht, Andreas Stemmer,