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Shaken, not stirred -- mythical god's capsules please!
Date:6/26/2014

Everything depends on how you look at them. Looking from one side you will see one face; and when looking from the opposite side you will see a different one. So appear Janus capsules, miniature, hollow structures, in different fragments composed of different micro- and nanoparticles. Theoreticians were able to design models of such capsules, but a real challenge was to produce them. Now, Janus capsules can be produced easily and at low cost.

Janus, the old Roman god of beginnings and transitions, attracted believers' attention with his two faces, each looking to different direction of the world. Janus capsules 'bubbles' made up of two shells stuck one another, each composed of micro- or nanoparticles of different properties have been for some time attracting the researchers' attention. They see in the capsules an excellent tool for transporting drugs and a vehicle leading to innovative materials. To have, however, Janus capsules generally accessible, efficient methods for their mass production must be developed. An important step in this direction is the achievement of researchers from the Norwegian and French research institutions and the Institute of Physical Chemistry of the Polish Academy of Sciences (IPC PAS) in Warsaw, reported recently in one of the most reputable scientific journals: "Nature Communications".

At present, it is not a problem to produce Janus spheres round, entirely filled micro- and nanoobjects with one part having different properties than the other. Such spheres can be, for instance, produced by sticking together two drops of different substances. After merging, the new drop requires a sufficiently fast fixation only, e.g., by cooling it down or initiating polymerisation of its materials. For instance, Janus spheres are particles with white and black halves, used for image generation in electrophoretic displays incorporated in e-book reading devices.

"Janus capsules differ from Janus spheres:
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Contact: Dr. Zbigniew Rozynek
zrozynek@ichf.edu.pl
Institute of Physical Chemistry of the Polish Academy of Sciences
Source:Eurekalert  

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Shaken, not stirred -- mythical god's capsules please!
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