Modeling phase behavior for quantifying micro-pervaporation experiments

Details Modeling phase behavior for quantifying micro-pervaporation experiments Modeling phase behavior for quantifying micro-pervaporation experiments

2008-12-05

arxiv.org/abs/0812.1166v1

Eur. Phys. J. E 28, 27-45 (2009)

Physics

Condensed Matter

Soft Condensed Matter

to be published in EPJ-E

Scientific paper

10.1140/epje/i2008-10419-y

We present a theoretical model for the evolution of mixture concentrations in a micro-pervaporation device, similar to those recently presented experimentally. The described device makes use of the pervaporation of water through a thin PDMS membrane to build up a solute concentration profile inside a long microfluidic channel. We simplify the evolution of this profile in binary mixtures to a one-dimensional model which comprises two concentration-dependent coefficients. The model then provides a link between directly accessible experimental observations, such as the widths of dense phases or their growth velocity, and the underlying chemical potentials and phenomenological coefficients. It shall thus be useful for quantifying the thermodynamic and dynamic properties of dilute and dense binary mixtures.

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