  We investigate the behaviour of a binary surfactant solution (AOT/water) as
it is progressively concentrated in microfluidic evaporators. We observe in
time a succession of phase transitions from a dilute solution up to a dense
state, which eventually grows and invades the microchannels. Analyzing these
observations, we show that, with a few experiments and a limited amount of
material, our microdevices permit a semi-quantitative screening of the
equilibrium phase diagram as well as a few kinetic observations.

Soft Condensed Matter