Northwestern University

Innotune LLC

Cycladex Inc.

Roger Bruce Pettman

James Fraser Stoddart

Xisen Hou

Chenfeng Ke

Dale F Arnold

Fluorescent dyes, ink compositions comprising the dyes, methods and devices for printing the ink compositions, images printed using the ink compositions and methods for authenticating the printed images are provided. The fluorescent dyes are heterorotaxanes that include large macrocyclic rings around fluorophores and are capable of emitting solid-state fluorescence. When the heterorotaxanes are combined with encapsulating agents and competitive binding agents in aqueous solution, the resulting ink composition exhibits a complex, dynamic equilibrium that provides a tunable fluorescence emission spectrum with a non-linear response to the dye concentration.

Supramolecular encrypted fluorescent security ink compositions

This invention relates to methods for the recovery of precious metals such as gold, silver, platinum, palladium and rare earths from precious metal-bearing materials. In particular, a method of purifying precious metal from a precious metal-bearing material comprising the steps

Methods of purifying precious metal

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Winter Park, FL, United States of America

Roger Bruce Pettman