Russian scientists have developed a unique technology for printing “invisible” images

Researchers have developed organic nanostructured ink to inkjet images that can only be seen in polarized light.

The demand for anti-counterfeiting technologies is growing rapidly. Nowadays, manufacturers often use QR codes and data signals, but the market needs more affordable methods, the use of which does not require large investments. A team from ITMO University’s Chemistry and Biology Cluster has created a unique technology for printing a color invisible coating that can be easily seen through a smartphone screen.

This effect is achieved due to colloidal ink with programmed cellulose nanoparticles. Scientists give them certain qualities in advance, and also adjust the necessary parameters of particles and solution for printing. This allows you to select the correct concentration of ink and modify it so that the mutual attraction and repulsion of nanoparticles does not allow them to be chaotically distributed, instead collecting them parallel to each other..

Russian scientists have developed a unique technology for printing 'invisible' images

The thickness of such coatings, which are formed as the ink is deposited, is selected taking into account certain optical phenomena observed in polarized light. In this way, you can print any full-color transparent image to protect products, banknotes, tickets and various items..

As a reminder, researchers have recently invented liquid crystals that can also prevent counterfeiting of money and documents..

text: Ilya Bauer, photo: iStock

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