Experimental study of electric current rectification in liquid microdiodes on the basis of electrokinetic instability
UDC
532, 537.2, 537.36EDN
SNNONNAbstract
One of the problems of the application of microfluidics is creation rectifying micro- or nanodevices, which rectify electric current. At the heart of known micro diodes laid the principle of asymmetry of a particular type. In this article experimentally implemented a new idea current rectification in microscales, which consists in use of combination asymmetry of the flow of ions, depending on the direction, namely, geometric asymmetry and asymmetry caused by electrokinetic instability. The device represents two channels: 2 cm macrochannel and 200 mkm microchannel, which separated by a semipermeable electric membrane. For production of the device the standard method of a photolithography is used. The liquid rectifier is connected to the high-voltage power supply by means of wire electrodes. The experiments are made in the frequency range of 1-10 Hz, current to 20 $\mu$A. The applied voltage is varied up to 1,000 V. The behavior of the current-voltage characteristics at a positive voltage is very close to linear, up to 100 V. At voltages of 700 V were fixed the irregular oscillations of the current (about 1%), at which the quality of rectification increased sharply. We explain this phenomenon of the emergence, because of electrokinetic instability of microvortices in macrochannel and their absence in the microchannel. This gives an additional asymmetry with respect to the direction of ion flow, which leads to a better rectifying effect
Keywords:
microdiode, fluidic current rectification, electrokinetic instability, photolithography, semipermeable membrane, geometric asymmetry, electrolyteFunding information
Работа выполнена при поддержке РФФИ (13-08-96536_р_юг_а, 14-08-00789 А, 14-08-01171 А).
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Copyright (c) 2014 Франц Е.А., Шиффбауэр Д., Демёхин Е.А.
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