The alternation between singlet and triplet states of electron pairs in charge-separated states plays an important role in nature. Presumably, even the compass of migratory birds can be explained by the influence of the geomagnetic field on the magnetic interplay between these two spin stat ... more
Binary mesocrystals from the nanobuilding kit
Research team led by Constance produces three-dimensional mesocrystals from two different types of nanocrystals - platinum and magnetite - for the first time. This lays the foundation for the synthesis of novel nanostructured solids with previously unexplored properties.
Mesocrystals are a class of solids formed by the regular arrangement of nanocrystals. These are tiny nanoparticles that have unique properties due to their small size. In mesocrystals, they take on a highly organized, superordinate form in a densely packed lattice. A German-Swiss research team led by Prof. Dr. Helmut Cölfen, a chemist from Constance, has now succeeded in synthesising particularly complex mesocrystals with largely unknown chemical and physical properties and in elucidating their structure.
The special feature: The novel solids consist of two different nanocrystals as basic building blocks - platinum and magnetite cubes - and organize themselves independently into a three-dimensional superstructure. Until now, mesocrystals from two different basic building blocks, so-called binary mesocrystals, could only be produced as two-dimensional structures.
The synthesis route and structural evidence of the binary 3D mesocrystals from platinum and magnetite nanocrystals have just been published in the journal Angewandte Chemie. The results of the study represent the first step towards a possible "modular system", with which the properties of different nanocrystals could be combined in a targeted manner in the future and transferred from the nano- to the more manageable micro-world - with a multitude of possible advantages and applications.
Ultrashort flashes of light lasting less than a quadrillionth of a second are fast growing in technological importance. In laser sources, pairs and groups of light flashes can be created instead of individual flashes. Similar to the chemically bonded atoms in a molecule, they are coupled wi ... more
Ultrafast laser spectroscopy allows to observe the motion of atoms at their natural time scales in the range of femtoseconds, the millionth of a billionth of a second. Electron microscopy, on the other hand, provides atomic spatial resolution. By combining electrons and photons in one instr ... more
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