We have developed an original setup using microfluidic tools allowing one toproduce continuously monodisperse microreactors ($\approx 100$ nL), and tocontrol their temperatures as they flow in the microdevice. With a specificmicrochannels geometry, we are able to apply large temperature quenches todroplets containing a KNO$_3$ solution (up to 50$^{\circ}$C in 10 s), and thento follow nucleation kinetics at high supersaturations. By measuring theprobability of crystal presence in the droplets as a function of time, weestimate the nucleation rate for different supersaturations, and confront ourresults to the classical nucleation theory.
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