Facile one-step and high-yield synthesis of few-layered and hierarchically porous boron nitride nanosheets

RSC Advances ◽  
2016 ◽  
Vol 6 (51) ◽  
pp. 45402-45409 ◽  
Author(s):  
Mingtao Zheng ◽  
Hanwu Dong ◽  
Yong Xiao ◽  
Shuting Liu ◽  
Hang Hu ◽  
...  
Keyword(s):  
Boron Nitride ◽  
Ammonium Chloride ◽  
Raw Materials ◽  
High Yield ◽  
Hierarchically Porous ◽  
Boron Nitride Nanosheets ◽  
One Step

Few-layered and hierarchically porous BNNSs high and tuneable H2 uptakes were prepared via a facile simultaneous etching and in situ nitridation method, in which metallic hexaboride (e.g., CaB6) and ammonium chloride were employed as raw materials.

High yield and greener C–H difluoromethylation reactions using copper iodide nanoparticles/boron nitride nanosheets as a versatile and recyclable heterogeneous catalyst

2021 ◽  
Author(s):  
Udayakumar Veerabagu ◽  
Gowsika Jaikumar ◽  
Fushen Lu ◽  
Franck Quero
Keyword(s):  
Boron Nitride ◽  
Heterogeneous Catalyst ◽  
High Efficiency ◽  
High Yield ◽  
Copper Iodide ◽  
Boron Nitride Nanosheets ◽  
Greener Synthesis ◽  
High Yields ◽  
Recyclable Heterogeneous Catalyst

The 3 wt% CuI/BNNS catalyst exhibited high efficiency for C–H difluoromethylation reactions and enabled greener synthesis at high yields using cyrene as a solvent. Furthermore, the catalyst could be easily recovered and recycled for at least five cycles.

In situ synthesis of polymer-modified boron nitride nanosheets via anionic polymerization

2021 ◽  
Vol 537 ◽  
pp. 147966
Author(s):  
Zhiyan He ◽  
Jian Zhao ◽  
Feixiang Li ◽  
Deli Zhang ◽  
Fuhai Guo ◽  
...  
Keyword(s):  
Boron Nitride ◽  
Anionic Polymerization ◽  
In Situ Synthesis ◽  
Boron Nitride Nanosheets

Silicon Nitride/Boron Nitride Composite by Combustion Synthesis

2007 ◽  
Vol 561-565 ◽  
pp. 531-534
Author(s):  
Ke Zhang ◽  
Qiang Zhang ◽  
Peng Fei Wang ◽  
Ling Bai ◽  
Wei Ping Shen ◽  
...  
Keyword(s):  
Silicon Nitride ◽  
Boron Nitride ◽  
Combustion Synthesis ◽  
Bending Strength ◽  
Volume Fraction ◽  
Raw Materials ◽  
Solid Reaction ◽  
N2 Atmosphere ◽  
Scanning Electron

Machinable silicon nitride/ hexahedral boron nitride (Si3N4/h-BN) composites were in-situ synthesized in a nitrogen (N2) atmosphere by means of combustion synthesis gas-solid reaction with silicon (Si) powder and h-BN as raw materials. The effect of the volume fraction of h-BN on the machinable properties of Si3N4/BN composite was studied. The results show that Si powder was fully nitrified and no residual Si was found. Microstructures by a scanning electron microscopy (SEM) show Columnar crystals of β-Si3N4 are the main phase and acicular crystals of h-BN disperse β-Si3N4 intergranular. With the increasing of the volume content of h-BN, the machinability of the composite increases, but the bending strength of composite decreases firstly and then increases. The lowest bending strength is 84.96MPa at 25% volume fraction of h-BN.

The AA* + B*B2 approach A simple and convenient synthetic strategy towards hyperbranched polyurea-urethanes

e-Polymers ◽  
2003 ◽  
Vol 3 (1) ◽  
Author(s):  
Bernd Bruchmann ◽  
Wolfgang Schrepp
Keyword(s):  
Functional Groups ◽  
Raw Materials ◽  
Protecting Groups ◽  
Isophorone Diisocyanate ◽  
Step Process ◽  
Synthetic Strategy ◽  
One Step

Abstract Synthesizing hyperbranched polyurethanes in a one step process using commercially available raw materials: these were the primary conditions for this work. By taking advantage of intramolecular reactivity differences of isocyanate groups in diisocyanates in combination with reactivity differences of OH and NH groups in alkanolamines, it is possible to generate in situ AB2 molecules by controlling reactions of specific functional groups towards each other. This AA* + B*B2 approach works without protecting groups and opens up a simple and versatile strategy towards hyperbranched aromatic as well as aliphatic polyureaurethanes. Preferential diisocyanates for this synthesis were 2,4-toluylene diisocyanate and isophorone diisocyanate, whereas diethanolamine and diisopropanolamine were used as isocyanate-reactive counterparts.

Flame-retardant activity of modified boron nitride nanosheets to cotton

2019 ◽  
Vol 90 (5-6) ◽  
pp. 512-522 ◽  
Author(s):  
Hong Liu ◽  
Yang Du ◽  
Shaohua Lei ◽  
Zhuoqun Liu
Keyword(s):  
Boron Nitride ◽  
Flame Retardant ◽  
Hexagonal Boron Nitride ◽  
Cotton Fabrics ◽  
High Yield ◽  
Limiting Oxygen Index ◽  
Boron Nitride Nanosheets ◽  
Boron Nitride Powder ◽  
Coated Fabrics ◽  
Index Value

Boron nitride nanosheets (BNN) were prepared by molten hydroxide-assisted liquid exfoliation from hexagonal boron nitride powder with an effectively high yield, and then modified with hexachlorocyclotriphosphazene (HCCP) to obtain HCCP-BNN. The series of samples were applied to prepare flame-retardant cotton fabrics with the impregnation-drying method, and successful treatment was confirmed by scanning electron microscopy. The combustion performance of the as-prepared cotton fabrics was tested and evaluated. After coating with HCCP-BNN, the combustion rate of the fabric is reduced in vertical and horizontal combustion conditions and the limiting oxygen-index value of cotton fabric increases to 24.1, becoming less flammable than the blank cotton. The fibrous structure of the BNN and HCCP-BNN coated fabrics is relatively complete after combustion, which indicates that BNN have a certain protective effect on the fabric. The results demonstrate HCCP-BNN as an effective flame-retardant for cotton fabrics.

In situ growth of metal nanoparticles on boron nitride nanosheets as highly efficient catalysts

2016 ◽  
Vol 4 (48) ◽  
pp. 19107-19115 ◽  
Author(s):  
Li Fu ◽  
Guoxin Chen ◽  
Nan Jiang ◽  
Jinhong Yu ◽  
Cheng-Te Lin ◽  
...  
Keyword(s):  
Boron Nitride ◽  
Metal Nanoparticles ◽  
Room Temperature ◽  
Reducing Agent ◽  
Metal Nanoparticle ◽  
In Situ Growth ◽  
Boron Nitride Nanosheets ◽  
Highly Efficient ◽  
Boron Nitride Nanosheet

We report a facile and general approach for the synthesis of boron nitride nanosheet (BNNS)–metal nanoparticle (NP) composites at room temperature without adding any reducing agent.

In-situ deformation mechanism and orientation effects in sintered 2D boron nitride nanosheets

2017 ◽  
Vol 708 ◽  
pp. 440-450 ◽  
Author(s):  
Archana Loganathan ◽  
Amit Sharma ◽  
Chris Rudolf ◽  
Cheng Zhang ◽  
Pranjal Nautiyal ◽  
...  
Keyword(s):  
Boron Nitride ◽  
Deformation Mechanism ◽  
Boron Nitride Nanosheets ◽  
Orientation Effects ◽  
In Situ Deformation

One-Step Exfoliation and Fluorination of Boron Nitride Nanosheets and a Study of Their Magnetic Properties

2014 ◽  
Vol 126 (14) ◽  
pp. 3719-3723 ◽  
Author(s):  
Miao Du ◽  
Xianlei Li ◽  
Aizhu Wang ◽  
Yongzhong Wu ◽  
Xiaopeng Hao ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Boron Nitride ◽  
Boron Nitride Nanosheets ◽  
One Step
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