PMID: 15244587Jul 13, 2004Paper

Self-assembled nanoparticle deposits formed at the contact line of evaporating micrometer-size droplets

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
Leonid V GovorGottfried H Bauer

Abstract

We report on the formation of self-assembled rings of Co Pt3 nanoparticles (ring diameter ranging from 0.6 to 1.5 microm, particle diameter 6 nm ) formed in an evaporating thin film. The latter was achieved on the surface of water by spreading a binary mixture composed of two solutions: nitrocellulose dissolved in amyl acetate and Co Pt3 particles stabilized by hexadecylamine dissolved in hexane. The self-assembly process of the nanometer-sized particles into micrometer-sized rings results from phase separation in a thin film of the mixed solutions, leading to a bilayer, and the subsequent decomposition during solvent evaporation of the top hexadecylamine-rich layer into droplets. Finally, the evaporation of the remaining solvent from these droplets gives rise to a retraction of their contact line. The Co Pt3 particles located at the contact line follow its motion and self-assemble along this line.

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