Electrostatic-driven ridge formation on nanoparticles coated with charged end-group ligands

Peijun Guo, Rastko Sknepnek, Monica Olvera De La Cruz*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

25 Scopus citations

Abstract

Using coarse-grained molecular dynamics simulations, we investigate the surface patterns of charged end-group ligands attached to faceted nanoparticles. A competition between electrostatic repulsion and hydrophobic ligand-ligand attraction leads to the formation of a number of different conformations of the ligand coatings. The most prominent conformation in icosahedral nanoparticles is a ridgelike structure that makes their surfaces highly anisotropic. Meanwhile, bundles seem more prominent than ridges for tetrahedral, cubic, octahedral, and dodecahedral nanoparticles of diameters comparable to the chain length. The applicability of the Debye-Huckel theory to describe the ridges is confirmed by comparing simulations with explicit ion simulations. We argue that a tunable ligand-coating pattern can be used as a simple and robust tool for achieving direction-dependent interactions between nanoparticles and provide control of their assembly into composite materials with a desired symmetry.

Original languageEnglish (US)
Pages (from-to)6484-6490
Number of pages7
JournalJournal of Physical Chemistry C
Volume115
Issue number14
DOIs
StatePublished - Apr 14 2011

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Energy(all)
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films

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