Monovalent Alkali Cations: Simple and Eco-Friendly Stabilizers for Surfactant-Free Precious Metal Nanoparticle Colloids

Jonathan Quinson, Jan Bucher, Søren B. Simonsen, Luise Theil Kuhn, Sebastian Kunz, Matthias Arenz*

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

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Abstract

The Co4Cat approach is a surfactant-free industry-relevant method to synthesize precious metal nanoparticles with enhanced catalytic properties. Colloidal nanoparticles are obtained by reduction of a metal salt in a monoalcohol such as methanol in the presence of a base. As opposed to alternative surfactant-free syntheses, in the Co4Cat approach, the nature of the alkali cations used strongly influences the most suitable strategy to achieve different nanoparticle size, to  process and to stabilize surfactant-free platinum nanoparticles. The rational selection of the base needed in the Co4Cat process is detailed here. Monovalent alkali cations stabilize the as-synthesized and redispersed nanoparticles in monoalcohols and aqueous solvents with the decreasing order of efficiency: Li+> Na+ > K+ ≈ Cs+ which correlates with the decreasing hydration energy of the cation. Li+ and Na+ cations are shown to serve as simple, eco-friendly, and efficient stabilizers for surfactant-free platinum nanoparticle colloids.
Original languageEnglish
JournalACS Sustainable Chemistry and Engineering
Volume7
Issue number16
Pages (from-to)13680-13686
ISSN2168-0485
DOIs
Publication statusPublished - 2019

Keywords

  • Co4Cat technology
  • Colloids
  • Nanoparticles
  • Cations
  • Alkali
  • Surfactant-free

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