Comparison between SBA-15 silica and CMK-3 carbon nanocasting for mesoporous boron nitride synthesis

Abstract

The synthesis of mesoporous boron nitride, using an aminoborazine as the boron nitride source, with silica (SBA-15) or mesoporous carbon (CMK-3) as the template is compared. Tri(methylamino)borazine (MAB) is converted to BN inside the mesopores of silica or carbon molecular sieves through a mild thermal process. Boron nitride is obtained after the removal of the hard template using an ammonia thermal treatment (carbon template) or an HF treatment (silica template). X-Ray diffraction, TEM and pore size analysis show that the structure of the BN molecular sieves synthesized from the carbon template consisted of a 2D regular array of uniform mesopores 3.4 nm in diameter. The hydrophilic nature of the silica template prevents successful pore filling with the aminoborazine precursor. Ordered BN molecular sieves are obtained at 1000 uC with a specific surface area of 500 m 2 g 21 using mesoporous carbon molecular sieves as a hard-template.

Nanocasting: A Versatile Strategy for Creating Nanostructured Porous Materials

“…Subsequently, using tri(methylamino)borazine as the boron nitride source and CMK-3 as the template, ordered mesoporous boron nitride with a specific surface area of 500 m 2 g -1 was synthesized, where the carbon template was removed by a high-temperature ammonia treatment. [108] We have attempted to use CMK-3 as a template to synthesize mesoporous alumina. However, such alumina does not maintain the ordered structure, as is the case in NCS-1, even though the resulting alumina is mesoporous.…”

Tunable porous boron nitride: Investigating its formation and its application for gas adsorption

“…The second class of synthesis method -templating method -uses a sacrificial material to control the porosity of the resulting BN. Some examples of templates employed include mesoporous silica, carbonaceous materials and zeolites [25][26][27]. Various organic compounds have also been mixed with boron and nitrogen precursors and used as structure-directing agents to produce porous BN, such as for instance cetyl-trimethylammonium bromide [28], or the triblock copolymer (P123) [12].…”

Anisotropic Hexagonal Boron Nitride Nanomaterials: Synthesis and Applications

“…Surface area and pore volume were maximized at pyrolysis temperatures of 800 ºC and essentially eliminated at 1200 ºC. These results indicate that the pore structure of polymerderived boron nitride is a function of both the precursor's polymer structure and pyrolysis conditions [117,118]. This demonstration of the ability to tailor BN's pore structure and adsorption properties by controlling these parameters is an important advance in nonoxide preceramic polymer processing.…”

“…Dibandjo et al prepared porous BN by nanocasting a hexagonally ordered mesoporous carbon (CMK-3) or a cubic mesoporous carbon (CMK-8) with a molecular BN precursor [68,117,118]. CMK-3 was prepared using SBA-15 silica as a template, and sucrose as a carbon source [117].…”