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  • Title: Coalescence of silver nanoparticles at room temperature: unusual crystal structure transformation and dendrite formation induced by self-assembly.
    Author: Grouchko M, Popov I, Uvarov V, Magdassi S, Kamyshny A.
    Journal: Langmuir; 2009 Feb 17; 25(4):2501-3. PubMed ID: 19166274.
    Abstract:
    It was found that during the evaporation of water from a droplet of a silver nanoparticles dispersion a self-assembly process leads to the coalescence of the nanoparticles at room temperature and eventually results in a 3D, micrometer-sized dendrite. Direct in situ HR-TEM observation of coalescence events of individual nanoparticles revealed that during this process a transformation of the nanoparticles' crystal structure takes place, from the common fcc silver structure to the unusual hcp structure. It was found that even-though a majority of the nanoparticles in the dispersion have the fcc structure the obtained dendrites are characterized by the hcp structure, reflecting the crystal structure transformation due to the coalescence process.
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