The rise of touchscreen technology has been a boon in many respects, but for people with long fingernails, there can be issues with the capacitive variety since fingernails are non-conductive and thus don't register on the screen as a touch. One can use a stylus, of course, or simply use the finger pad under the nail, but ideally it would be nice to be able to use one's fingernail. A conductive nail polish might do the trick, according to research presented at a meeting of the American Chemical Society in Atlanta, Georgia.
The work began as a special project for Manasi Desai, an undergraduate at Centenary College of Louisiana who has an interest in cosmetic chemistry and decided to investigate ways to make fingernails compatible with touchscreen technology. There are a few existing conductive nail polishes that rely on spiking a clear polish with carbon nanotubes, conductive polymers, or metallic particles. And in 2013 and 2014, a proposed press-on false fingernail with a capacitive tip was showcased at CES in Las Vegas, although the technology doesn't seem to be commercially available.
Desai reasoned that existing polishes rely on additives that could be dangerous if inhaled, as well as having a limited shade range given that they impart a black or metallic shimmer. Working with her supervisor, organometallic chemist Joshua Lawrence, Desai decided to try to create a clear, colorless nail polish that didn't use any toxic materials and could be applied over any manicure.
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Source: Ars Technica
