Discriminating among Acid-, Base-, and Salt-Based Electrolytes Using a Single Microfluidic Channel

Kianoosh Nemati; Faramarz Hossein-Babaei

doi:10.4028/www.scientific.net/KEM.543.285

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Discriminating among Acid-, Base-, and Salt-Based Electrolytes Using a Single Microfluidic Channel

Abstract:

The information obtained by monitoring the adsorption progress rates of ionic species in a liquid-filled microfluidic channel is used for their identification. The adsorption rates of three different analytes, HCl, KOH, and KCl, in a pure water-filled channel of microscale diameter are experimentally investigated by recording the temporal variation of the channel conductance. The electrolytes examined belong to the acid, base, and salt categories, respectively. Different temporal profiles are obtained for the electrical conductance of the channel. Each temporal profile was defined as a high dimensional vector which was mapped into a two dimensional feature space for categorization. It is shown that the extracted information from a conductance variation profile facilitates discrimination among HCl, KOH, and KCl solutions in distilled water regardless of their concentrations. The single channel device fabricated based on the presented concept is a low cost and disposable device which can be used for discrimination between acid, base, and salt electrolytes. The device can be utilized in electronic tongue applications.