US Patent 7794620 - Chlorestic monolayers with nanoparticles

http://ip.com/patent/US7794620

This patent from SICPA Holding S.A. teaches the inclusion of nanoparticles in liquid crystal films to improve color change effects or add properties such as magnetization to the film. Claim 1 reads:

1. Liquid-crystal monolayer comprising a three-dimensionally crosslinked, cholesteric liquid-crystal mixture and nanoparticles, wherein said nanoparticles have a particle size of 1 to 999 nm and have properties selected from the group consisting of luminescence, fluorescence, phosphorescence and magnetism.