Keplerate cluster (Mo-132) mediated electrostatic assembly of nanoparticles

Jonathan Gooch, Abhishek A. Jalan, Stephanie Jones, Corey R. Hine, Rabeka Alam, Somenath Garai, Mathew M. Maye, Achim Müller, Jon Zubieta

Research output: Contribution to journalArticle

5 Scopus citations


The electrostatic assembly between a series of differently charged Mo-132-type Keplerates present in the compounds (NH4)42[{(MoVI)MoVI5O21(H2O)6}12 {MoV2O4(CH3COO)}30].ca. {300 H2O+10 CH3COONH4} (Mo-132a), (NH4)72-n[{(H2O)81-n+(NH4)n} {(MoVI)MoVI5O21(H2O)6}12 {MoV2O4(SO4)}30].ca. 200 H2O (Mo-132b), and Na10(NH4)62[{(MoVI)MoVI5O21(H2O)6}12 {MoV2O4(HPO4)}30]. ca. {300H2O+2Na++2NH4++4H2PO4-} (Mo-132c) with cationic gold nanoparticles (AuNPs) was investigated for the first time. The rapid electrostatic assembly from nanoscopic entities to micron scale aggregates was observed upon precipitation, which closely matched the point of aggregate electroneutrality. Successful assembly was demonstrated using UV-vis, DLS, TEM, and zeta-potential analysis. Results indicate that the point at which precipitation occurs is related to charge balance or electroneutrality, and that counterions at both the Mo-132 and AuNP play a significant role in assembly.

Original languageEnglish (US)
Pages (from-to)144-150
Number of pages7
JournalJournal of Colloid and Interface Science
StatePublished - Oct 15 2014


  • Au nanoparticles
  • Electrostatic assembly
  • Keplerate clusters
  • Micron scale aggregation
  • Zeta-potential analysis

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Surfaces, Coatings and Films
  • Colloid and Surface Chemistry

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