The Mathematical Institute, University of Oxford, Eprints Archive

Molecular Tilt on Monolayer-Protected Nanoparticles

Giomi, L. and Bowick, M. J. and Ma, X. and Majumdar, A. (2011) Molecular Tilt on Monolayer-Protected Nanoparticles. A Letters Journal Exploring the Frontiers of Physics . (Submitted)

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Abstract

The structure of the tilted phase of monolayer-protected nanoparticles is investigated by means of a simple Ginzburg-Landau model. The theory contains two dimensionless parameters representing the preferential tilt angle and the ratio (epsilon) between the energy cost due to spatial variations in the tilt of the coating molecules and that of the van der Waals interactions which favors uniform tilt. We analyze the model for both spherical and octahedral particles. On spherical particles, we find a transition from a tilted phase, at small (epsilon), to a phase where the molecules spontaneously align along the surface normal and tilt disappears. Octahedral particles have an additional phase at small characterized by the presence of six topological defects. These defective configurations provide preferred sites for the chemical functionalization of monolayer-protected nanoparticles via place-exchange reactions and their consequent linking to form molecules and
bulk materials.

Item Type:Article
Subjects:D - G > General
Research Groups:Oxford Centre for Collaborative Applied Mathematics
ID Code:1471
Deposited By:Peter Hudston
Deposited On:24 Feb 2012 07:28
Last Modified:24 Feb 2012 07:28

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