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Synthetic and biological nanoparticles combined to produce new metamaterials

Date:
December 19, 2012
Source:
Aalto University
Summary:
Scientists have succeeded in organizing virus particles, protein cages and nanoparticles into crystalline materials. These nanomaterials are important for applications in sensing, optics, electronics and drug delivery.

Two different protein cages, cowpea chlorotic mottle virus (blue) and Pyrococcus furiosus ferritin (red), can be used to guide the assembly of binary nanoparticles superlattices through tunable electrostatic interactions with charged gold nanoparticles (yellow).
Credit: Image courtesy of Aalto University

Scientists from Aalto University, Finland, have succeeded in organising virus particles, protein cages and nanoparticles into crystalline materials. These nanomaterials studied by the Finnish research group are important for applications in sensing, optics, electronics and drug delivery.

Layer structures, or superlattices, of crystalline nanoparticles have been extensively studied in recent years. The research develops hierarchically structured nanomaterials with tuneable optical, magnetic, electronic and catalytic properties.

Such biohybrid superlattices of nanoparticles and proteins would allow the best features of both particle types to be combined. They would comprise the versatility of synthetic nanoparticles and the highly controlled assembly properties of biomolecules, according to the authors.

The research group also discovered magnetic self-assemblies of ferritin protein cages and gold nanoparticles. These magnetic assemblies can modulate efficiently spin-spin relaxation times of surrounding protons in water by enhancing the spin dephasing and consequently provide contrast enhancement in magnetic resonance imaging (MRI).

The gold nanoparticles and viruses adopt a special kind of crystal structure. It does not correspond to any known atomic or molecular crystal structure and it has previously not been observed with nano-sized particles.

Virus particles -- the old foes of humankind -- can do much more than infect living organisms. Evolution has rendered them with the capability of highly controlled self-assembly properties. Ultimately, by utilising their building blocks we can bring multiple functions to hybrid materials that consist of both living and synthetic matter, Kostiainen trusts.

Youtube video link: http://youtu.be/lkkUe5xntNw


Story Source:

The above story is based on materials provided by Aalto University. Note: Materials may be edited for content and length.


Journal Reference:

  1. Mauri A. Kostiainen, Panu Hiekkataipale, Ari Laiho, Vincent Lemieux, Jani Seitsonen, Janne Ruokolainen, Pierpaolo Ceci. Electrostatic assembly of binary nanoparticle superlattices using protein cages. Nature Nanotechnology, 2012; DOI: 10.1038/nnano.2012.220

Cite This Page:

Aalto University. "Synthetic and biological nanoparticles combined to produce new metamaterials." ScienceDaily. ScienceDaily, 19 December 2012. <www.sciencedaily.com/releases/2012/12/121219101225.htm>.
Aalto University. (2012, December 19). Synthetic and biological nanoparticles combined to produce new metamaterials. ScienceDaily. Retrieved April 21, 2014 from www.sciencedaily.com/releases/2012/12/121219101225.htm
Aalto University. "Synthetic and biological nanoparticles combined to produce new metamaterials." ScienceDaily. www.sciencedaily.com/releases/2012/12/121219101225.htm (accessed April 21, 2014).

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