Fig. 3: Sustained oscillations under out-of-equilibrium conditions in flow using a CSTR.
From: A catalytically active oscillator made from small organic molecules
a, Reaction scheme for flow oscillation experiments. b, Oscillation space predicted by the model: the region coloured by a gradient from red to green indicates the ranges of 4 and 2 that are predicted to support sustained oscillations with [3] = 30 mM, [5] = 5 mM and a space velocity of 10−4 s−1 (defined as flow rate divided by CSTR volume); colour coding shows the predicted period (h). In the light blue region, dampened oscillations are predicted to take place and in the uncoloured region no oscillations occur. Filled squares indicate where experiments found sustained oscillations, and open squares where dampened oscillations were observed. c, Flow experiment carried out in CSTR at 60 °C using [2] = 100 mM, [3] = 30 mM, [4] = 1.8 M and [5] = 5 mM in DMSO with a space velocity of 10−4 s−1. Oscillation was monitored using in situ infrared spectroscopy. Sustained oscillations were obtained for 2 (blue), 6 (red) and 7 (purple). Period and amplitude are mean plus s.d. from a single experiment. d–h, The oscillation space was investigated by carrying out experiments with the following deviations from the conditions shown in c: d, [2] = 80 mM, e, [2] = 120 mM, f, [4] = 1.4 M, g, [4] = 1.0 M, h, [4] = 2.2 M.
