ES2.1 - Discriminating Among Alkali Ions in Aqueous Solutions by Seebeck Voltage Measurement in Microfluidic Channels

F. Hossein-Babaei, B. Harkinezhad, Y. Saedi, University Of Vienna, Universitätsring 1, 1010 Vienna, Austria
Microfluidic systems allow fast and parallel analyses of fluid samples consuming microscopic quantities of the analytes. While varieties of information acquisition techniques from microchannels are practiced, novel methods for extracting information regarding the nature of the fluid analyte are sought after. Here, for the first time, we record the liquid Seebeck voltages established along the liquid-filled channels with predetermined temperature gradients, and correlate the results to the
more » ... esults to the chemical composition of the analyte. Liquid Seebeck voltages are measured along microfluidic channels filled with aqueous solutions of LiCl, NaCl, and KCl. At constant molality, these solutions demonstrate Seebeck coefficients of +250, +350, and +500 μV/K, respectively. It is shown that the information acquired can be used for differentiation between electrolytes of different compositions.
doi:10.5162/imcs2018/es2.1 fatcat:pfy3du6xdjbuzhxdngc4fmdj6e