This document will self-erase in five minutes

时间:2019-03-02 06:14:04166网络整理admin

By Jon Evans THIS article will self-erase in 10 seconds. At least it would if it had been written on a film that exploits the colour-changing ability of nanoparticles. The technology could make it possible to create documents that wipe themselves clean after they’ve been read. A team at Northwestern University in Evanston, Illinois, coated gold nanoparticles with a layer of hair-like molecules called 4-(11-mercaptoundecanoxy)azobenzene or MUA. When zapped with ultraviolet light, these filaments change their shape and charge distribution,