In an article in the prestigious journal Proceedings of the National Academy of Sciences, Professor Lennart Bergström shows how a glass bottle and a simple hobby magnet can be used to produce and arrange extremely small cubes of iron oxide in a perfectly checkered pattern.
The new method can give magnetic films with superior information storage capacity," says Lennart Bergström.
To produce nanoparticles with a defined form and size and at the same time organize them in well-ordered structures is one of the few realistic ways of producing tomorrow's nanomaterials on an industrial scale. It sounds like a dream, but the fact is that nature uses these construction principles in order to make the wings of a butterfly shimmer in all the colors of the rainbow and to create a compass needle of magnetic nanoparticles in certain bacteria.
In the article, Lennart Bergström and his colleagues show how it is possible to create a self-organizing system in which the system itself can achieve a flawless structure. Instead of slowly building up these intricate structures by for example etching, the particles are "programmed" to build the desired structure themselves. Nanoparticles are ideal building blocks for creating two- and three-dimensional structures with tailor-made properties. It is possible to combine metals, semiconductors, and magnetic nanoparticles in one and the same material, thereby obtaining entirely new combinations of properties.
"Our vision is to get nanoparticles to collaborate and construct complicated structures at will," says Lennart Bergström. "New types of nanostructured materials with unique characteristics, such as magnetic and catalytic properties, can then be created where they are most needed and in such a way that they can be readily reused. This opens up exciting possibilities to tailor the structure and function of materials, a goal for all materials chemists."
Name of article: "Magnetic field induced assembly of oriented superlattices from maghemite nanocubes"A. Ahniyaz, Y. Sakamoto, and L. Bergström, PNAS, ("early edition" published at end of week 44)
For more information: Prof. Lennart Bergström, Department of Physical, Inorganic, and Structural Chemistry, Stockholm University. cell phone: +46 (0)70-5179991; phone: +46 (0)8-16 23 68, e-mail: email@example.com For images: phone: +46 (0)8-16 40 90, e-mail firstname.lastname@example.org
Maria Erlandsson | idw
Did you know that the wrapping of Easter eggs benefits from specialty light sources?
13.04.2017 | Heraeus Noblelight GmbH
To e-, or not to e-, the question for the exotic 'Si-III' phase of silicon
05.04.2017 | Carnegie Institution for Science
More and more automobile companies are focusing on body parts made of carbon fiber reinforced plastics (CFRP). However, manufacturing and repair costs must be further reduced in order to make CFRP more economical in use. Together with the Volkswagen AG and five other partners in the project HolQueSt 3D, the Laser Zentrum Hannover e.V. (LZH) has developed laser processes for the automatic trimming, drilling and repair of three-dimensional components.
Automated manufacturing processes are the basis for ultimately establishing the series production of CFRP components. In the project HolQueSt 3D, the LZH has...
Reflecting the structure of composites found in nature and the ancient world, researchers at the University of Illinois at Urbana-Champaign have synthesized thin carbon nanotube (CNT) textiles that exhibit both high electrical conductivity and a level of toughness that is about fifty times higher than copper films, currently used in electronics.
"The structural robustness of thin metal films has significant importance for the reliable operation of smart skin and flexible electronics including...
The nearby, giant radio galaxy M87 hosts a supermassive black hole (BH) and is well-known for its bright jet dominating the spectrum over ten orders of magnitude in frequency. Due to its proximity, jet prominence, and the large black hole mass, M87 is the best laboratory for investigating the formation, acceleration, and collimation of relativistic jets. A research team led by Silke Britzen from the Max Planck Institute for Radio Astronomy in Bonn, Germany, has found strong indication for turbulent processes connecting the accretion disk and the jet of that galaxy providing insights into the longstanding problem of the origin of astrophysical jets.
Supermassive black holes form some of the most enigmatic phenomena in astrophysics. Their enormous energy output is supposed to be generated by the...
The probability to find a certain number of photons inside a laser pulse usually corresponds to a classical distribution of independent events, the so-called...
Microprocessors based on atomically thin materials hold the promise of the evolution of traditional processors as well as new applications in the field of flexible electronics. Now, a TU Wien research team led by Thomas Müller has made a breakthrough in this field as part of an ongoing research project.
Two-dimensional materials, or 2D materials for short, are extremely versatile, although – or often more precisely because – they are made up of just one or a...
20.04.2017 | Event News
18.04.2017 | Event News
03.04.2017 | Event News
24.04.2017 | Physics and Astronomy
24.04.2017 | Materials Sciences
24.04.2017 | Life Sciences