Gold-containing nanoporous aluminum oxide membranes a process for their production and their use

US6180222A · kind A · utility

Assignee

• Cerdec Aktiengesellschaft Keramische Farben · DE

Inventors

• Andreas Schulz · Karben, DE
• Günter Schmid · Hemhofen, DE
• Gabor Louis Hornyak · Evergreen, US
• Thomas Sawitowski · Wesel, DE

Key dates

• Filing date: Aug 13, 1998
• Grant date: Jan 30, 2001
• Expiry date: Aug 13, 2018

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/268
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

Red decorations on substrates which can undergo decorative baking, such as glass, porcelain, ceramic and metal, can be produced using nanoporous aluminium oxide membranes according to the invention, the nanopores of which contain ligand-stabilized gold clusters. The membrane is applied to the substrate followed by baking, resulting in formation of the red color. Alternatively, the membrane can be converted into a red membrane by thermolysis, after which the membrane is employed for production of the decoration. The membranes according to the invention can be obtained by bringing a nanoporous Al.sub.2 O.sub.3 membrane into contact with a solution of a ligand-stabilized gold cluster, in particular one of the formula Au.sub.55 L.sub.12 X.sub.6, wherein L is a phosphane ligand and X is an anion.