Physicochemical Characteristics of Nitrogen Sorption on High-Porous Powders of Graphene-Like Boron Nitride

  
V.Petrova,
  
L.S.Suvorova
 

I. M. Frantsevich Institute for Problems of Materials Science of the NAS of Ukraine, Omeliana Pritsaka str.,3, Kyiv, 03142, Ukraine
Powder Metallurgy - Kiev: Frantsevich Institute for Problems of Materials Science NASU, 2016, #07/08
http://www.materials.kiev.ua/article/2213

Abstract

The porous structure of graphene-like boron nitride t-BNg powders is evaluated. The material is homogenous, micro-mesoporous, with a distribution of slit-like pores in the range 3.53–4.12 nm corresponding to 55% of the volume and 60% of the specific surface area of mesoporous. The specific surface area of micropores calculated with the Dubinin–Kadlets method (t-method) is 28.3 m2/g and the specific surface area of mesopores calculated with the Barrett–Joyner–Halenda method is 141 m2/g. Powders of nanosized t-BNg synthesized from urea contain impurities of polycondensed flat particles of boron oxonitride. Impurities as refined sublimate (white powder) are separated out of the washed and dried t-BNg powder by subsequent vacuum heat treatment at 540 K and a pressure to ≤1.0 Pa. The sublimate is identified as heterocyclic six-membered dimer with molecular formula H(OH)[(BON)2](OH)H.


BORON OXONITRIDE, CLEANING, GRAPHENE-LIKE BORON NITRIDE T-BNG, IMPURITY, SURFACE STRUCTURE