Thursday, October 28, 2004

Lamellar buckyballs?

US Patent 6,809,046 (issued October 26, 2004) states: Inorganic solid particles having a lamellar fullerene (buckyball) structure are also useful in the present invention.

Gee, isn't carbon of a lamellar structure called "graphite"? Pure buckyballs have a cubic structure. Materials having a lamellar structure can be composed of sheets or plates of atoms in hexagonal array, with strong bonding within the sheet and weak van der Waals bonding between sheets, providing low shear strength between sheets. A nonlimiting example of a lamellar structure is a hexagonal crystal structure, such as P63/mmc of graphite.

The '046 is directed to non-heat cleaned glass fiber fabrics comprising resin compatible coatings that offer higher tensile strengths than corresponding fabrics that have been heat cleaned and silane finished. These fabrics can be used in a wide variety of applications, such as reinforcements for composites such as printed circuit boards.


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