Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Noble Fungi

19.09.2008
Noble metal nanoparticles deposit on the mycelium of growing fungi—an approach to new catalytic systems?

When fungi, such as penicillium, grow, they form a thread-like network, the mycelium. If the fungus is grown in a medium containing nanoscopic particles of a noble metal, the resulting mycelium is coated with the nanoparticles.

As researchers from the Technical University in Dresden and the Max Planck Institute for the Chemical Physics of Solid Materials in Dresden (Germany) report in the journal Angewandte Chemie, such hybrids could be an interesting new approach for the production of catalytic systems.

The team, led by Alexander Eychmüller and Karl-Heinz Pée, cultivated various types of fungus in media with finely divided (colloidal) nanoparticles of noble metals. In the presence of the tiny gold, platinum, or palladium particles, the fungi grew with no appreciable impairment. Silver particles, which are toxic to microorganisms, were also tolerated by one variety of fungus. The nanoparticles are deposited on the surface of the growing mycelium—without any special modification beforehand. Thus hybrid systems made of fungi and noble metals are formed: tubular hyphae covered in multiple layers of individual nanoparticles.

... more about:
»mycelium »nanoparticles »particles

The optical properties of nanoscopic particles depend on their size. The researchers determined that the optical properties of their deposited particles differ only slightly from those of the nanoparticles in solution. Fungal threads with a 0.2µm gold covering thus appear reddish brown, like a solution of such gold nanoparticles. This is evidence that the nanoparticles have not aggregated to form larger units.

Because the particles remain separate, the mycelium-bound noble metal nanoparticles should also retain their special catalytic activities. The researchers were thus able to determine that a platinum–fungus hybrid catalyzes the redox reaction of hexacyanoferrate and thiosulfate in aqueous solution. The “enobled” fungal mycelium offers a system easy to separate from the solution after the reaction and a highly specific surface—important for a catalyst.

Author: Alexander Eychmüller, Technische Universität Dresden (Germany), http://www.chm.tu-dresden.de/pc2/AlexLebenslaufWeb.shtml

Title: Fungal Templates for Noble-Metal Nanoparticles and Their Application in Catalysis

Angewandte Chemie International Edition 2008, 47, No. 41, 7876–7879, doi: 10.1002/anie.200801802

Alexander Eychmüller | Angewandte Chemie
Further information:
http://pressroom.angewandte.org
http://www.chm.tu-dresden.de/pc2/AlexLebenslaufWeb.shtml

Further reports about: mycelium nanoparticles particles

More articles from Life Sciences:

nachricht World’s Largest Study on Allergic Rhinitis Reveals new Risk Genes
17.07.2018 | Helmholtz Zentrum München - Deutsches Forschungszentrum für Gesundheit und Umwelt

nachricht Plant mothers talk to their embryos via the hormone auxin
17.07.2018 | Institute of Science and Technology Austria

All articles from Life Sciences >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: First evidence on the source of extragalactic particles

For the first time ever, scientists have determined the cosmic origin of highest-energy neutrinos. A research group led by IceCube scientist Elisa Resconi, spokesperson of the Collaborative Research Center SFB1258 at the Technical University of Munich (TUM), provides an important piece of evidence that the particles detected by the IceCube neutrino telescope at the South Pole originate from a galaxy four billion light-years away from Earth.

To rule out other origins with certainty, the team led by neutrino physicist Elisa Resconi from the Technical University of Munich and multi-wavelength...

Im Focus: Magnetic vortices: Two independent magnetic skyrmion phases discovered in a single material

For the first time a team of researchers have discovered two different phases of magnetic skyrmions in a single material. Physicists of the Technical Universities of Munich and Dresden and the University of Cologne can now better study and understand the properties of these magnetic structures, which are important for both basic research and applications.

Whirlpools are an everyday experience in a bath tub: When the water is drained a circular vortex is formed. Typically, such whirls are rather stable. Similar...

Im Focus: Breaking the bond: To take part or not?

Physicists working with Roland Wester at the University of Innsbruck have investigated if and how chemical reactions can be influenced by targeted vibrational excitation of the reactants. They were able to demonstrate that excitation with a laser beam does not affect the efficiency of a chemical exchange reaction and that the excited molecular group acts only as a spectator in the reaction.

A frequently used reaction in organic chemistry is nucleophilic substitution. It plays, for example, an important role in in the synthesis of new chemical...

Im Focus: New 2D Spectroscopy Methods

Optical spectroscopy allows investigating the energy structure and dynamic properties of complex quantum systems. Researchers from the University of Würzburg present two new approaches of coherent two-dimensional spectroscopy.

"Put an excitation into the system and observe how it evolves." According to physicist Professor Tobias Brixner, this is the credo of optical spectroscopy....

Im Focus: Chemical reactions in the light of ultrashort X-ray pulses from free-electron lasers

Ultra-short, high-intensity X-ray flashes open the door to the foundations of chemical reactions. Free-electron lasers generate these kinds of pulses, but there is a catch: the pulses vary in duration and energy. An international research team has now presented a solution: Using a ring of 16 detectors and a circularly polarized laser beam, they can determine both factors with attosecond accuracy.

Free-electron lasers (FELs) generate extremely short and intense X-ray flashes. Researchers can use these flashes to resolve structures with diameters on the...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

VideoLinks
Industry & Economy
Event News

Leading experts in Diabetes, Metabolism and Biomedical Engineering discuss Precision Medicine

13.07.2018 | Event News

Conference on Laser Polishing – LaP: Fine Tuning for Surfaces

12.07.2018 | Event News

11th European Wood-based Panel Symposium 2018: Meeting point for the wood-based materials industry

03.07.2018 | Event News

 
Latest News

Microscopic trampoline may help create networks of quantum computers

17.07.2018 | Information Technology

In borophene, boundaries are no barrier

17.07.2018 | Materials Sciences

The role of Sodium for the Enhancement of Solar Cells

17.07.2018 | Power and Electrical Engineering

VideoLinks
Science & Research
Overview of more VideoLinks >>>