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Title: Crystalline boron nitride aerogels

Abstract

This disclosure provides methods and materials related to boron nitride aerogels. In one aspect, a material comprises an aerogel comprising boron nitride. The boron nitride has an ordered crystalline structure. The ordered crystalline structure may include atomic layers of hexagonal boron nitride lying on top of one another, with atoms contained in a first layer being superimposed on atoms contained in a second layer.

Inventors:
; ; ; ; ;
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1349730
Patent Number(s):
9,611,146
Application Number:
14/320,300
Assignee:
Lawrence Livermore National Security, LLC LBNL
DOE Contract Number:
AC02-05CH11231; AC52-07NA27344
Resource Type:
Patent
Resource Relation:
Patent File Date: 2014 Jun 30
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; 36 MATERIALS SCIENCE

Citation Formats

Zettl, Alexander K., Rousseas, Michael, Goldstein, Anna P., Mickelson, William, Worsley, Marcus A., and Woo, Leta. Crystalline boron nitride aerogels. United States: N. p., 2017. Web.
Zettl, Alexander K., Rousseas, Michael, Goldstein, Anna P., Mickelson, William, Worsley, Marcus A., & Woo, Leta. Crystalline boron nitride aerogels. United States.
Zettl, Alexander K., Rousseas, Michael, Goldstein, Anna P., Mickelson, William, Worsley, Marcus A., and Woo, Leta. Tue . "Crystalline boron nitride aerogels". United States. doi:. https://www.osti.gov/servlets/purl/1349730.
@article{osti_1349730,
title = {Crystalline boron nitride aerogels},
author = {Zettl, Alexander K. and Rousseas, Michael and Goldstein, Anna P. and Mickelson, William and Worsley, Marcus A. and Woo, Leta},
abstractNote = {This disclosure provides methods and materials related to boron nitride aerogels. In one aspect, a material comprises an aerogel comprising boron nitride. The boron nitride has an ordered crystalline structure. The ordered crystalline structure may include atomic layers of hexagonal boron nitride lying on top of one another, with atoms contained in a first layer being superimposed on atoms contained in a second layer.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Apr 04 00:00:00 EDT 2017},
month = {Tue Apr 04 00:00:00 EDT 2017}
}

Patent:

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  • 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 oxidemore » 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.« less
  • This patent describes a process for the preparation of polycrystalline cubic boron nitride from hexagonal boron nitride. It comprises: removing the oxide from the surface of the hexagonal boron nitride particles to form hexagonal boron nitride particles having a substantially oxide-free surface; coating the hexagonal boron, nitride particles having an oxide-free surface with an agent capable of preventing re-oxidation of the surface of the hexagonal boron nitride particles to form coated hexagonal boron nitride particles in an oxide-free state; converting the coated hexagonal boron nitride particles in an oxide-free state to a polycrystalline cubic boron nitride mass by direct conversionmore » of hexagonal boron nitride to cubic boron nitride.« less
  • Boron nitride--boron nitride composite bodies may be produced by combining pure boron nitride fibers with partially nitrided fibers consisting essentially of B, N, O, and H, and hot pressing the composite at elevated temperatures and pressure. The partially nitrided material serves as a source of matrix material for the boron nitride fibers; and, when fiber orientation is properly controlled, bodies of extremely high strength may be obtained. Densities in excess of 1.5 g/cm/sup 3/ may be obtained in a one-step process which overcomes difficulties inherent in multiple-step nitriding and renitriding processes. 1 table.
  • This paper reports gels containing a poly(borazinyl amine) and tetrahydrofuran processed by CO{sub 2} supercritical drying techniques followed by pyrolysis. The resulting BN ceramic aerogels are highly porous, and the microstructure, porosity, and surface area characteristics have been examined. The aerogels show excellent thermal stability exhibiting surface areas in excess of 350 m{sup 2}/g and porosities greater than 0.8 even when heated in argon at 1500{degrees}C for 8 h. By removing solvent via evaporation before supercritical drying, the mean pore radius can be varied between 3.6 and 10 nm.
  • This a very simple process for making boron nitride by mixing sodium cyanide and boron phosphate and heating the mixture in an inert atmosphere until a reaction takes place. The product is a white powder of boron nitride that can be used in applications that require compounds that are stable at high temperatures and that exhibit high electrical resistance.