Synthetic routes to boron nitride

Paine, Robert T.; Narula, Chaitanya K.

doi:10.1021/cr00099a004

Cited by 911 publications

(601 citation statements)

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“…The charge transfer between the BNNT and CO 2 is negligible with a value of only 0.002e -. We also investigated CO 2 adsorption on BN sheets comprised of different sized unit cells (from 6 × 6 to 10 × 10) and BNNTs with different diameters (from (6,6) to (10,10)) and found that CO 2 can only form weak interactions with these BN nanomaterials when they are in their neutral states.…”

Section: Resultsmentioning

confidence: 99%

“…For the BN sheet, unit cells range from 5 × 5 to 10 × 10, chosen with a 15 Å vacuum between sheets in order to avoid interactions between periodic images, and the Brillouin zone is sampled by 6 × 6 × 1 kpoints using the Monkhorst-Pack scheme. For BNNTs with index from (5,5) to (10,10), tetragonal supercells with dimension 30 × 30 × c Å 3 are used, where c is 10.068 ~ 10.072 Å and optimized to minimize the energy of the nanotube. The values of lengths of 30 Å were large enough to avoid interactions between periodic images.…”

Section: Methodsmentioning

confidence: 99%

“…S (BNNT) = 2 (4) where a is the side length of the BN sheets and with values from 12.580 ~ 25.160 Å for BN sheets with the unit cells from 5 × 5 to 10 × 10, r is the radius of the BNNTs, and c is the length of the BNNTs, which is 10.068 ~ 10.072 Å for BNNTs with index from (5,5) to (10,10).…”

Section: Methodsmentioning

confidence: 99%

“…Calculations were carried out on BN sheets with unit cells from 6 × 6 to 10 × 10 and BNNTs with indices from (6, 6) to (10,10). The BN sheet lattices are 12.6 Å ~ 25.2 Å and BNNT diameters are 6.8 Å ~ 14.0 Å.…”

Section: Charge Distributions and Electron Densities Of Charged Bn Shmentioning

confidence: 99%

“…[10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25] They have excellent mechanical properties, high thermal conductivity, and high resistance to oxidation. [10][11][12][13][14][15] These properties make them very promising in a variety of potential applications such as optoelectronic nanodevices, spintronics, light emission, photocatalysts, thermal rectifiers, functional composites, etc. [16][17][18][19][20][21] One potential application is for CO 2 capture and storage.…”

Section: Introductionmentioning

confidence: 99%

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Charge-Controlled Switchable CO₂ Capture on Boron Nitride Nanomaterials

et al. 2013

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Increasing concerns about the atmospheric CO2 concentration and its impact on the environment are motivating researchers to discover new materials and technologies for efficient CO2 capture and conversion. Here, we report a study of the adsorption of CO2, CH4, and H2 on boron nitride (BN) nanosheets and nanotubes (NTs) with different charge states. The results show that the process of CO2 capture/release can be simply controlled by switching on/off the charges carried by BN nanomaterials. CO2 molecules form weak interactions with uncharged BN nanomaterials and are weakly adsorbed. When extra electrons are introduced to these nanomaterials (i.e., when they are negatively charged), CO2 molecules become tightly bound and strongly adsorbed. Once the electrons are removed, CO2 molecules spontaneously desorb from BN absorbents. In addition, these negatively charged BN nanosorbents show high selectivity for separating CO2 from its mixtures with CH4 and/or H2. Our study demonstrates that BN nanomaterials are excellent absorbents for controllable, highly selective, and reversible capture and release of CO2. In addition, the charge density applied in this study is of the order of 1013 cm-2 of BN nanomaterials and can be easily realized experimentally. 2013 American Chemical Society. ABSTRACT:Increasing concerns about the atmospheric CO 2 concentration and its impact on the environment are motivating researchers to discover new materials and technologies for efficient CO 2 capture and conversion. Here, we report a study of the adsorption of CO 2 , CH 4 and H 2 on boron nitride (BN) nanosheets and nanotubes (NTs) with different charge states. The results show that the process of CO 2 capture/release can be simply controlled by switching on/off the charges carried by BN nanomaterials. CO 2 molecules form weak interactions with uncharged BN nanomaterials and are weakly adsorbed. When extra electrons are introduced to these nanomaterials (i.e. when they are negatively charged), CO 2 molecules become tightly bound and strongly adsorbed. Once the electrons are removed, CO 2 molecules spontaneously desorb from BN absorbents. In addition, these negatively charged BN nano-sorbents show high selectivity for separating CO 2 from its mixtures with CH 4 and/or H 2 . Our study demonstrates that BN nanomaterials are excellent absorbents for controllable, highly selective, and reversible capture and release of CO 2. In addition, the charge density applied in this study is of the order of 10 13 cm -2 of BN nanomaterials, and can be easily realized experimentally.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Charge Distributions and Electron Densities Of Charged Bn Shmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Charge-Controlled Switchable CO₂ Capture on Boron Nitride Nanomaterials

et al. 2013

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Synthesis of poly(borazinylamine)

Zeng¹

1999

J. Appl. Polym. Sci.

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1,3,5-Trichloroborazine (TCB) was prepared from the reaction of ammonia chloride with boron trichloride. TCB along with hexamethyldisilazane and boron trichloride were used to synthesize boron nitride (BN) preceramic polymer poly(borazinylamine). This study showed that, the lower the reaction temperature, the higher the synthetic yield. Poly(borazinylamine)'s solubility mainly depended on the ratio of TCB, (Me 3 Si) 2 NH, and BCl 3 . The solvent used in the reaction had a large effect on the ceramic yield of poly(borazinylamine). A soluble poly(borazinylamine) with good synthesis and ceramic yields was obtained when the reaction temperature was Ϫ15°C, cyclohexane was the solvent, and the ratio of TCB : (Me 3 Si) 2 NH : BCl 3 was 1 : 6 : 1. By means of infrared and mass spectroscopy analyses, the structure of the poly(borazinylamine) was identified. Thermal decomposition of the poly(borazinylamine) precursor to hydrolyzed BN was also examined. Hydrolyzed BN was obtained at 1000°C, where the ceramic yield was 35-45%.

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Efficient synthesis and NMR data ofN- orB-substituted borazines

Framery

Vaultier

2000

Heteroatom Chem.

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The thermolysis of borane‐primary amine complexes RNH2.BH3 was reexamined. Excellent yields of N‐substituted borazines were obtained at 200°C, when R is an alkyl group, and at 120°C for R = Ph. B‐alkyl, vinyl, and alkynyl borazines were easily prepared in good to excellent yields by ammonolysis of bis(diisopropylamino)organoboranes at temperatures above 95°C. The 1H, 13C, and 15N or 14N NMR data for all borazines prepared are reported for the first time. © 2000 John Wiley & Sons, Inc. Heteroatom Chem 11:218–225, 2000

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Synthetic routes to boron nitride

Cited by 911 publications

References 23 publications

Charge-Controlled Switchable CO₂ Capture on Boron Nitride Nanomaterials

Charge-Controlled Switchable CO₂ Capture on Boron Nitride Nanomaterials

Synthesis of poly(borazinylamine)

Efficient synthesis and NMR data ofN- orB-substituted borazines

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Synthetic routes to boron nitride

Cited by 911 publications

References 23 publications

Charge-Controlled Switchable CO2 Capture on Boron Nitride Nanomaterials

Charge-Controlled Switchable CO2 Capture on Boron Nitride Nanomaterials

Synthesis of poly(borazinylamine)

Efficient synthesis and NMR data ofN- orB-substituted borazines

Contact Info

Product

Resources

About

Charge-Controlled Switchable CO₂ Capture on Boron Nitride Nanomaterials

Charge-Controlled Switchable CO₂ Capture on Boron Nitride Nanomaterials