Crystalline boron nitride aerogels

US9840414B2 · kind B2 · utility

Assignees

• Lawrence Livermore National Security, LLC · US
• The Regents of the University of California · US

Inventors

• Alexander K. Zettl · Kensington, US
• Michael Rousseas · Burlingame, US
• Anna P. Goldstein · Berkeley, US
• William Mickelson · Albany, US
• Marcus A. Worsley · Hayward, US
• Leta Woo · Oakland, US

Key dates

• Filing date: Jan 17, 2017
• Grant date: Dec 12, 2017
• Expiry date: Jan 17, 2037

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C04B2235/80
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

This disclosure provides methods and materials related to boron nitride aerogels. For example, one aspect relates to a method for making an aerogel comprising boron nitride, comprising: (a) providing boron oxide and an aerogel comprising carbon; (b) heating the boron oxide to melt the boron oxide and heating the aerogel; (c) mixing a nitrogen-containing gas with boron oxide vapor from molten boron oxide; and (d) converting at least a portion of the carbon to boron nitride to obtain the aerogel comprising boron nitride. Another aspect relates to a method for making an aerogel comprising boron nitride, comprising heating boron oxide and an aerogel comprising carbon under flow of a nitrogen-containing gas, wherein boron oxide vapor and the nitrogen-containing gas convert at least a portion of the carbon to boron nitride to obtain the aerogel comprising boron nitride.