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Lookup NU author(s): Professor Mark Geoghegan
This is the authors' accepted manuscript of an article that has been published in its final definitive form by Royal Society of Chemistry, 2019.
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© The Royal Society of Chemistry.A model system for the investigation of diffusional transport in compartmentalized nanosystems is described. Arrays of “corrals” enclosed within poly[oligo(ethylene glycol)methyl ether methacrylate] (POEGMA) “walls” were fabricated using double-exposure interferometric lithography to deprotect aminosilane films protected by a nitrophenyl group. In exposed regions, removal of the nitrophenyl group enabled attachment of an initiator for the atom-transfer radical polymerization of end-grafted POEGMA (brushes). Diffusion coefficients for poly(ethylene glycol) in these corrals were obtained by fluorescence correlation spectroscopy. Two modes of surface diffusion were observed: one which is similar to diffusion on the unpatterned surface and a very slow mode of surface diffusion that becomes increasingly important as confinement increases. Diffusion within the POEGMA brushes does not significantly contribute to the results.
Author(s): Clarkson CG, Johnson A, Leggett GJ, Geoghegan M
Publication type: Article
Publication status: Published
Online publication date: 14/03/2019
Acceptance date: 07/03/2019
Date deposited: 05/08/2021
ISSN (print): 2040-3364
ISSN (electronic): 2040-3372
Publisher: Royal Society of Chemistry
PubMed id: 30869707
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