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Virtuelle Ausstellung Initiative

University of Duisburg-Essen

Logo of University of Duisburg-Essen

Clean Nanoparticles for Biomedicine and Catalysis Size matters. To us, purity of nanomaterials matters even more. Hence, we provide nanoparticles in liquid without ligands:

  • platinum, palladium,
  • gold, silver.
  • gold-silver-alloy, nickel-iron-alloy, platinum alloys dispersed in liquids such as
  • water or buffer saline, or
  • acetone, aclohol, tetrahydrofurane coated with
  • nothing (100% carbon-free!), or
  • functional biomolecules (nucleic acids, peptides), or
  • polymers.

Such sufcatant-free colloids may provide new possibilities in nanotechnology even for "estab-lished" materials. Surfaces of ligand-free nanoparticles are very active and can easily be attached to supportive carriers or functional molecules, making the particles "building blocks" for appli-cations in fields like catalysis and biotechnology. For the production of ligand-free nanoparticles, target material of high purity is ablated in a liquid using laser pulses at high intensities. This physical method does not employ chemical precursors or additional surfactants. The resulting nanoparticles excel by their purity and material variety and have proven their applicability as building blocks for different application fields. For example, their large adsorption efficiency and surface activity allows to deposit catalysts from various materials on microparticle supports for energy conversion applications "supported nanoparticles". In a similar way, strong adsorption to ligand-free metal surfaces can be used to reach a high conjugation efficiency and yield when binding biomolecules to nano-gold. This "bioconjugation" with functional groups is applied in biological and medical applications like lateral flow assays, bioimaging and drug targeting.