Physics – Condensed Matter – Soft Condensed Matter
Scientific paper
2010-04-08
Phys. Rev. Lett., vol 104, 138302 (2010)
Physics
Condensed Matter
Soft Condensed Matter
Scientific paper
10.1103/PhysRevLett.104.138302
In this letter, we characterize experimentally the diffusiophoretic motion of colloids and lambda- DNA toward higher concentration of solutes, using microfluidic technology to build spatially- and temporally-controlled concentration gradients. We then demonstrate that segregation and spatial patterning of the particles can be achieved from temporal variations of the solute concentration profile. This segregation takes the form of a strong trapping potential, stemming from an osmotically induced rectification mechanism of the solute time-dependent variations. Depending on the spatial and temporal symmetry of the solute signal, localization patterns with various shapes can be achieved. These results highlight the role of solute contrasts in out-of-equilibrium processes occuring in soft matter.
Abecassis B.
Bocquet Lyderic
Cottin-Bizonne Cecile
Palacci J.
Ybert Christophe
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