Order-to-disorder transition in ring-shaped colloidal stains

Details Order-to-disorder transition in ring-shaped colloidal stains Order-to-disorder transition in ring-shaped colloidal stains

2011-07-04

arxiv.org/abs/1107.0618v2

Phys. Rev. Lett. 107, 085502 (2011)

Physics

Fluid Dynamics

accepted for PRL

Scientific paper

10.1103/PhysRevLett.107.085502

A colloidal dispersion droplet evaporating from a surface, such as a drying coffee drop, leaves a distinct ring-shaped stain. Although this mechanism is frequently used for particle self-assembly, the conditions for crystallization have remained unclear. Our experiments with monodisperse colloidal particles reveal a structural transition in the stain, from ordered crystals to disordered packings. We show that this sharp transition originates from a temporal singularity of the flow velocity inside the evaporating droplet at the end of its life. When the deposition speed is low, particles have time to arrange by Brownian motion, while at the end, high-speed particles are jammed into a disordered phase.

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