Abstract: A dental appliance including a polymeric shell with an arrangement of cavities configured to receive one or more teeth and a coating on at least portion of the polymeric shell. The coating can include a polyester with an ion exchange functional group covalently bonded thereto, and the ion exchange functional group can release in an oral environment at least one therapeutically beneficial ion at a surface of a tooth.

Abstract: A fuel cell catalyst is provided comprising nanostructured elements comprising microstructured support whiskers bearing a thin film of nanoscopic catalyst particles, where the thin film of nanoscopic catalyst particles is made by alternating application of first layers comprising catalyst material, such as platinum or a platinum alloy, and second layers comprising a vacuum sublimable organic molecular solid, such as an aromatic organic pigments such as perylene red or a pthalocyanine