NDLI: Assembly of gold nanoparticles into regular clusters inside emulsion droplets

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Assembly of gold nanoparticles into regular clusters inside emulsion droplets

Content Provider	Semantic Scholar
Author	Lacava, Johann
Copyright Year	2014
Abstract	The controlled clustering of nanoparticles into defined geometric arrangements has opened a new research area for the design of novel materials with advanced functionalities. This thesis describes a route that exploits liquid droplets as confined templates within which nanoparticles are assembled. Upon removal of the dispersed solvent from the emulsion droplets, the particles formed cluster-like structures. The particles did not arrange into small pieces of dense packings, but resembled clusters predicted for Lennard-Jones interaction potentials. In-situ observation of the assembly process via surface plasmon spectroscopy and small-angle x-ray scattering suggested that assembly occured rapidly, shortly before complete evaporation. The resulting Lennard-Jones geometries represent minimum-energy arrangements of particles. The distribution of the gold nanoparticles in the emulsions was studied for different surfactants. Good surfactants (e.g. Triton X-100) blocked the interface and confined particles in the droplet, whereas others (e.g. Tween 85) formed synergistic mixtures with the nanoparticles at the interfaces. Supraparticles with Lennard-Jones geometries only formed for surfactants that block the interface. The assembly of nanoparticles into minimum-energy clusters was sensitive to interactions between ligands bound to the nanoparticles surfaces, too. The ageing of gold nanoparticles with dodecanethiol ligands was studied for different storage conditions. Surprisingly, fractionation of particles appeared upon ageing. Desorption of ligand was the major process responsible for sedimentation and changes in polarity upon ageing and led to changes in the structure of the supraparticles.
File Format	PDF HTM / HTML
DOI	10.22028/D291-23021
Alternate Webpage(s)	https://publikationen.sulb.uni-saarland.de/bitstream/20.500.11880/23077/1/Lacava_Dissertation.pdf
Alternate Webpage(s)	https://doi.org/10.22028/D291-23021
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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