Understanding the Mechanisms of Gold Shell Growth onto Polymer Microcapsules to Control Shell Thickness

Tasker, Alison L., Hitchcock, James, Baxter, Elaine A., Cayre, Olivier J., and Biggs, Simon (2017) Understanding the Mechanisms of Gold Shell Growth onto Polymer Microcapsules to Control Shell Thickness. Chemistry: an Asian journal, 12 (13). pp. 1641-1648.

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Polymer microcapsules have been used commercially for decades, however they have an inherent flaw which renders them impractical as a carrier of small, volatile molecules. The porous nature of the polymer shell allows for diffusion of the encapsulated molecules into the bulk. The use of metal shells is an innovative way to prevent undesired loss of small molecules from the core of microcapsules, however it is important, particularly when using expensive metals to ensure that the resulting shell is as thin as possible. Here we investigate the fundamental mechanisms controlling the gold shell thickness when a fragrance oil is encapsulated in a poly(methyl methacrylate) shell. We consider the distribution of the nanoparticles on the capsule surface, and from quantification of the adsorbed nanoparticle (NP) density and resulting shell thickness, we propose mechanisms to describe the gold shell growth for systems with high and low NP surface coverage. We suggest from our observations that the gold grows to fill in the gaps between NPs. At low NP concentrations, thicker metal shells form. We postulate that this is due to the low NP density on the surface, forcing the gold clusters to grow larger before they meet the adjacent ones. Thus, to grow the thinnest possible shells a densely packed monolayer of platinum nanoparticles is required on the capsule surface.

Item ID: 73349
Item Type: Article (Research - C1)
ISSN: 1861-471X
Keywords: gold, metal shell growth, nanoparticles, platinum, polymer microcapsules, shell thickness
Copyright Information: © 2017 Wiley-VCH Verlag GmbH & Co. KGaA
Date Deposited: 25 Aug 2022 04:49
FoR Codes: 34 CHEMICAL SCIENCES > 3406 Physical chemistry > 340603 Colloid and surface chemistry @ 100%
SEO Codes: 28 EXPANDING KNOWLEDGE > 2801 Expanding knowledge > 280105 Expanding knowledge in the chemical sciences @ 100%
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