E Ink, How is it made?

Electronic ink is a special type of ink that can display different colors when exposed to an electric field. It is made through a two step process that involves creating two-toned charged particles and encapsulating them in a transparent polymeric shell. The resulting nanoparticle shells are suspended in a solvent until the ink can be applied to a surface. First developed in the early 1990s, electronic ink promises to revolutionize the printing industry and maybe even change the way we interact with the world.

Electronic ink is like traditional ink in that it is a colored liquid that can be coated onto nearly any surface. Suspended in the liquid are millions of microcapsules that contain tiny, two-toned polymeric particles. One side of the particle is a dark color while the other is a contrasting light color. Similar to a magnet, the dark colored side of the particle has an electric charge that is opposite that of the light colored side. When the ink is exposed to an electric field, the particles realign themselves, depending on the charge of the field. When all of the dark colored sides are attracted to the surface, the ink looks dark. When an opposite electric charge is applied, the light colored sides orient face forward and the surface looks light. This ability to change from white to black or visa versa whenever desired makes electronic ink extremely useful. When a book or other surface is coated with electronic ink, it can be reprogrammed to display different words or pictures.

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