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  • Title: Emulsions-directed assembly of gold nanoparticles to molecularly-linked and size-controlled spherical aggregates.
    Author: Hussain I, Zhang H, Brust M, Barauskas J, Cooper AI.
    Journal: J Colloid Interface Sci; 2010 Oct 01; 350(1):368-72. PubMed ID: 20609445.
    Abstract:
    Aggregation of gold nanoparticles into soluble spherical assemblies using bi-functional ligands i.e., dithiols has recently been demonstrated but with limited control over the size of such assemblies. Herein, we report a new approach to further control the size of water dispersible spherical assemblies by confining gold nanoparticles in tiny oil droplets in water (oil-in-water emulsions) followed by their cross-linking with alkanedithiols. By controlling the size of the oil droplets and the concentration of nanoparticles, the size of spherical aggregates can be controlled from 20 to 400 nm. Cryo-TEM micrographs confirm the formation of covalently-linked soluble spherical nanoparticle assemblies within the oil emulsions in water. Such size-controlled nanoparticle assemblies may have several potential applications including those in gas sensors, controlled delivery, and optical coatings.
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