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Microfluidic Exploration of the Phase Diagram of a Surfactant/Water Binary System

J. Leng, M. Joanicot, and A. Ajdari — Langmuir 23 (2007) 2315-2317

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We investigate the behaviour of a binary surfactant
solution (AOT/water) as it is progressively concen-
trated in microfluidic evaporators. We observe in
time a succession of phase transitions from a di-
lute solution up to a dense state, which eventually
grows and invades the microchannels. Analyzing
these observations, we show that, with a few ex-
periments 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.

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