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Lecture Philip Moriarty cancelled

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WanneerWaar
09 december 2005 FWN-Building 5114.0004, Nijenborgh 4, 9747 AG, Groningen
Speaker: Dr. Philip Moriarty --CANCELLED-- 
Affiliation: School of Physics and Astronomy, University of Nottingham, UK
Title: Directing far-from-equilibrium assembly of nanoparticle arrays
Date: Fri Dec 9, 2005
Start: 10.00
Location: FWN-Building 5114.0004
Host: P. Rudolf
Telephone: +31 50 363 4736 / 4974

Abstract

Although the self-assembly of nanoparticle (mono)layers and solids from solution continues to be an intensely active sub-field of nanometre scale science, there has been relatively little work performed to date on assembly far from equilibrium. We discuss the wide variety of quite striking nanoparticle patterns formed via spin-coating of thiol-passivated Au nanocrystals from simple solvents onto silicon substrates. Spin-coating leads to rapid evaporation of the solvent and produces kinetically-limited structures ranging from cellular networks to 'spinodal patterns' very reminiscent of those formed in polymer thin films. Moreover, we have recently found that nanoparticle array morphology and topology can be modified quite dramatically via localised chemical heterogeneities on the silicon surface. These heterogeneities in our case are 'userdefinable' and are formed via AFM tip-driven oxidation of a hydrogen-passivated (and thus hydrophobic) silicon substrate. The prospects for tuning the morphology of nanoparticle arrays using this combination of directed- and self-assembly will be outlined.
Laatst gewijzigd:22 oktober 2012 14:30