Bridging interactions and selective nanoparticle aggregation mediated by monovalent cations

Dawei Wang, Baudilio Tejerina, István Lagzi, Bartlomiej Kowalczyk, Bartosz A. Grzybowski

Research output: Contribution to journalArticle

46 Citations (Scopus)

Abstract

Selective aggregation and precipitation of like-charged nanoparticles (NPs) covered with carboxylate ligands can be induced by different monovalent cations. The ordering of critical concentrations required for NP precipitation is Cs+≫K+>Li+>Na+> Rb+ and does not correlate with the size of hydrated cations M +, nor can it be predicted by the Hofmeister series. On the other hand, different anions have no effect on the precipitation trends. These observations are rationalized by a theoretical model combining the elements of the DLVO theory with molecular-level calculations. The key component of the model is the cation-specific binding of various metal cations to the carboxylate ligands.

Original languageEnglish
Pages (from-to)530-536
Number of pages7
JournalACS Nano
Volume5
Issue number1
DOIs
Publication statusPublished - Jan 25 2011

    Fingerprint

Keywords

  • Bridging interaction
  • Modeling
  • Nanoparticles
  • Precipitation
  • Selective aggregation

ASJC Scopus subject areas

  • Materials Science(all)
  • Engineering(all)
  • Physics and Astronomy(all)

Cite this