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Electrostatic assembly of binary nanoparticle superlattices using protein cages.

Mauri A Kostiainen1, Panu Hiekkataipale, Ari Laiho

  • 1Molecular Materials, Department of Applied Physics, Aalto University, 00076 Espoo, Finland. mauri.kostiainen@aalto.fi

Nature Nanotechnology
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Researchers created novel binary nanoparticle superlattices using protein cages. These biohybrid structures self-assemble into unique crystal formations with potential applications in metamaterials and medical imaging.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Biotechnology

Background:

  • Binary nanoparticle superlattices are key for multifunctional metamaterials.
  • Incorporating biological building blocks into these structures is challenging.
  • Protein nanocages offer monodisperse, geometrically defined platforms for self-assembly.

Purpose of the Study:

  • To investigate the use of protein cages for directing the self-assembly of 3D binary superlattices.
  • To explore the formation of novel crystal structures using biohybrid components.
  • To assess the potential of these assemblies in magnetic resonance imaging.

Main Methods:

  • Utilized electrostatically patchy protein cages (cowpea chlorotic mottle virus and ferritin).
  • Encapsulated RNA or superparamagnetic iron oxide nanoparticles within negatively charged cages.
  • Directed self-assembly with positively charged gold nanoparticles via tunable electrostatic interactions.

Main Results:

  • Achieved self-assembly of 3D binary superlattices using protein cages and gold nanoparticles.
  • Observed an AB(8)(fcc) crystal structure with gold nanoparticles and viruses, a novel structure not seen in atomic or molecular crystals.
  • Formed an interpenetrating simple cubic AB structure (CsCl-isostructural) with gold nanoparticles and ferritin cages.
  • Demonstrated contrast enhancement in magnetic resonance imaging using these magnetic assemblies.

Conclusions:

  • Protein cages effectively direct the self-assembly of complex 3D binary superlattices.
  • The study presents novel biohybrid superlattices with unique crystal structures.
  • These self-assembled magnetic structures show promise for MRI contrast enhancement.