Fig. 2: Signal amplification and detection.
From: Real-time signal processing via chemical reactions for a microfluidic molecular communication system
a Evolution of the absorbance of a BTB solution at 453 and 616 nm with the actual pH (pHa) of the solution. Experimental data are compared with the theoretical predictions obtained using Supplementary equation (7). The concentration of BTB [BTB] was 0.2 mmol L−1. c–e Response of the amplification reaction to a non-square incoming signal. c Flow rate profiles of the pumps injecting Y and Sol. d Analytical prediction of the pHa at location X1 shown in (b) based on the calibration in standard glassware (Supplementary note 4). The symbols Y, Amp, and Sol represent the different chemical solutions injected in the platform. e Measurement of the absorbance at 616 nm of the solution using the spectrometer for different concentrations of BTB [BTB] in Amp. The profiles in (c) and (d) have been shifted by the observation time for ease of comparison with (e). pHY = 10.8 and pHAmp = 5.3.
