High-Yield Preparation of Edge-Functionalized and Water Dispersible Few-Layers of Hexagonal Boron Nitride (hBN) by Direct Wet Chemical Exfoliation

2021 ◽  
Author(s):  
Le Yu ◽  
Pei Lay Yap ◽  
Diana Tran ◽  
Alexandre Manuel Caraca Santos ◽  
Dusan Losic
Keyword(s):  
Boron Nitride ◽  
Hexagonal Boron Nitride ◽  
High Yield ◽  
Water Dispersible ◽  
Chemical Exfoliation ◽  
Wet Chemical

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.

scholarly journals High-Yield Synthesis of Cubic and Hexagonal Boron Nitride Nanoparticles by Laser Chemical Vapor Decomposition of Borazine

2013 ◽  
Vol 2013 ◽  
pp. 1-5 ◽  
Author(s):  
A. Hidalgo ◽  
V. Makarov ◽  
G. Morell ◽  
B. R. Weiner
Keyword(s):  
Electron Microscopy ◽  
Boron Nitride ◽  
Hexagonal Boron Nitride ◽  
Chemical Vapor ◽  
High Yield ◽  
X Ray Diffraction ◽  
Transmission Electron ◽  
Chemical Vapor Decomposition ◽  
Electron Energy Loss ◽  
Bn Nanostructures

We report a new method for the synthesis of boron nitride nanostructures (nBN) using laser chemical vapor decomposition (LCVD). Borazine was used as precursor and excited with two simultaneous radiations, the fundamental and second YAG laser harmonics. If only one of the two radiations is employed, no reaction takes place. Abundant BN powder is obtained after one hour of laser radiation. The BN yield obtained with the LCVD technique is about 83% by weight. The BN material was characterized using scanning electron microscopy, transmission electron microscopy, electron energy loss spectroscopy, Raman spectroscopy, Fourier transform infrared spectroscopy, and X-ray diffraction. They all indicate that the BN powder consists of a mixture of hexagonal and cubic BN nanostructures. No other BN phases or stoichiometries were found. The size of the resulting BN nanostructures is in the range of 20–100 nm and their B : N composition is 1 : 1. A simplified mechanism involving laser-excited states followed by photoinduced removal of hydrogen is proposed to understand the synthesis of BN nanopowder by LCVD of borazine.

High-performance NO2 sensors based on spontaneously functionalized hexagonal boron nitride nanosheets via chemical exfoliation

Nanoscale ◽  
2019 ◽  
Vol 11 (45) ◽  
pp. 21909-21916 ◽  
Author(s):  
Yue He ◽  
Dongdong Li ◽  
Wei Gao ◽  
Hong Yin ◽  
Fang Chen ◽  
...  
Keyword(s):  
Boron Nitride ◽  
Gas Sensors ◽  
High Performance ◽  
Hexagonal Boron Nitride ◽  
Boron Nitride Nanosheets ◽  
Chemical Exfoliation

Sulfate modified BNNS based gas sensors exhibit superior sensing performances, offering a powerful platform for NO2 sensing and/or capturing applications.

scholarly journals Amphiphilic graphene oxide stabilisation of hexagonal BN and MoS2 sheets

2015 ◽  
Vol 51 (58) ◽  
pp. 11709-11712 ◽  
Author(s):  
M. Haniff Wahid ◽  
Xianjue Chen ◽  
Christopher T. Gibson ◽  
Colin L. Raston
Keyword(s):  
Aqueous Solution ◽  
Graphene Oxide ◽  
Boron Nitride ◽  
Hexagonal Boron Nitride ◽  
Molybdenum Disulphide ◽  
Water Dispersible

A simple and scalable method has been developed for directly forming water-dispersible heterolaminar solids involving mixing aqueous solution of amphiphilic graphene oxide with hexagonal boron nitride or molybdenum disulphide in N-methylpyrrolidone.

Anticorrosive performance of waterborne epoxy coatings containing water-dispersible hexagonal boron nitride (h-BN) nanosheets

2017 ◽  
Vol 397 ◽  
pp. 77-86 ◽  
Author(s):  
Mingjun Cui ◽  
Siming Ren ◽  
Jia Chen ◽  
Shuan Liu ◽  
Guangan Zhang ◽  
...  
Keyword(s):  
Boron Nitride ◽  
Hexagonal Boron Nitride ◽  
Epoxy Coatings ◽  
Water Dispersible ◽  
Waterborne Epoxy

Marcus-Hush Theory Revealed by Electron Tunneling Through Hexagonal Boron Nitride

2019 ◽  
Author(s):  
Matěj Velický ◽  
Sheng Hu ◽  
Colin R. Woods ◽  
Peter S. Toth ◽  
Viktor Zólyomi ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Boron Nitride ◽  
Electron Tunneling ◽  
Hexagonal Boron Nitride ◽  
Large Body ◽  
Liquid Solution ◽  
Limiting Current ◽  
Electron Transfer Rate Constant ◽  
Electrochemical Parameters ◽  
Voltammetric Measurements

Marcus-Hush theory of electron transfer is one of the pillars of modern electrochemistry with a large body of supporting experimental evidence presented to date. However, some predictions, such as the electrochemical behavior at microdisk electrodes, remain unverified. Herein, we present a study of electron tunneling across a hexagonal boron nitride barrier between a graphite electrode and redox levels in a liquid solution. This was achieved by the fabrication of microdisk electrodes with a typical diameter of 5 µm. Analysis of voltammetric measurements, using two common redox mediators, yielded several electrochemical parameters, including the electron transfer rate constant, limiting current, and transfer coefficient. They show a significant departure from the Butler-Volmer behavior in a clear manifestation of the Marcus-Hush theory of electron transfer. In addition, our system provides a novel experimental platform, which could be applied to address a number of scientific problems such as identification of reaction mechanisms, surface modification, or long-range electron transfer.

Sign in / Sign up

Export Citation Format

Share Document