Summary
Formation of self-assembled rings of CoPt3 nanoparticles was achieved on the surface of water by spreading a binary mixture composed of two solutions: nitrocellulose dissolved in amyl acetate and CoPt3 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 pancakes. The subsequent evaporation of the remaining solvent from these pancakes gives rise to a retraction of their contact line. The CoPt3 particles located at the contact line follow its motion and self-assemble along this line.
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Govor, L.V. (2008). Self-Assembled Nanoparticle Rings. In: Al-Shamery, K., Parisi, J. (eds) Self-Organized Morphology in Nanostructured Materials. Springer Series in Materials Science, vol 99. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-72675-3_4
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