Today, scientists have discovered an ionic anion that is water-soluble and capable of two-photon 3D printing. This new anion is an exciting development in 3D printing technology, as it has the potential to open up new possibilities for producing complex shapes and structures. The anion is composed of a polyoxometalate cage with a polyethylene glycol linker and a fluorinated counterion. This unique combination gives the anion the ability to form strong electrostatic interactions with other molecules and allows it to dissolve easily in water. This makes it an ideal material for two-photon 3D printing, as it can be used to create intricate structures with greater accuracy and detail than was previously possible.

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source: Phys.org