Cobalt Oxide/Graphene Nanosheets/Hexagonal Boron Nitride (Co3O4/CoO/GNS/h-BN) Catalyst for High Sulfur Utilization in Li–S Batteries at Elevated Temperatures

2021 ◽  
Author(s):  
Yasmin Mussa ◽  
Muhammad Arsalan ◽  
Edreese Alsharaeh
Keyword(s):  
Boron Nitride ◽  
Cobalt Oxide ◽  
Elevated Temperatures ◽  
Hexagonal Boron Nitride ◽  
Graphene Nanosheets

Chemical vapor deposition of boron nitride using premixed borontrichloride and ammonia

1991 ◽  
Vol 6 (11) ◽  
pp. 2393-2396 ◽  
Author(s):  
Vladimir Pavlović ◽  
Horst-Rainer Kötter ◽  
Christoph Meixner
Keyword(s):  
Chemical Vapor Deposition ◽  
Boron Nitride ◽  
Vapor Deposition ◽  
Elevated Temperatures ◽  
Hexagonal Boron Nitride ◽  
Chemical Vapor ◽  
Deposit Formation ◽  
Deposition Zone ◽  
Single Tube ◽  
N Compounds

Chemical vapor deposition (CVD) of boron nitride (BN) is most readily performed using BCl3 and NH3, which are brought into the deposition zone through two separate tubes. This causes some problems: inadequate mixing leading to a nonuniform deposit, formation of solid intermediates, etc. To avoid these problems, the process was performed by mixing BCl3 and NH3 at elevated temperatures (120–220 °C) prior to entering the deposition zone. The reaction between them took place by the forming of volatile stoichiometric B–N compounds (trichloroborazine and iminochloroborane), which were then transported through a single tube into a deposition zone. The resulting deposit was found to be hexagonal boron nitride.

Tribology in Superplastic Forming Processing of 3Y-TZP/Al2O3 Ceramic at Elevated Temperatures

2007 ◽  
Vol 551-552 ◽  
pp. 507-512
Author(s):  
F. Wang ◽  
Kai Feng Zhang ◽  
Wen Bo Han
Keyword(s):  
High Pressure ◽  
Boron Nitride ◽  
Friction Factor ◽  
Elevated Temperatures ◽  
Hexagonal Boron Nitride ◽  
Superplastic Forming ◽  
Ceramic Materials ◽  
Cubic Phase ◽  
X Ray Diffraction ◽  
Higher Temperature

Superplastic forming processing of ceramic materials at high temperatures and high pressure puts forward very high requests to moulds and lubricants, at which conditions seeking for appropriate lubricants is one of important preconditions in the superplastic forming of ceramic materials. Using ring compressive testing, lubricities of hexagonal boron nitride in superplastic compressive forming processing of 3Y-TZP/Al2O3 ceramic composite at elevated temperatures were investigated. Theoretical curves of friction factor were drawn according to upper bound method. Ring compressive tests were adopted at temperature of 1400 °C-1600 °C. The results indicate that when BN is used, friction factor is about 0.4, meanwhile friction factor don’t have great changes with higher temperature and increasing strain rate. X-ray diffraction shows that under high temperature and high pressure no boron nitride converts to cubic phase, which remains at room temperature.

Formation and Dynamics of Electron-Irradiation-Induced Defects in Hexagonal Boron Nitride at Elevated Temperatures

Nano Letters ◽  
2016 ◽  
Vol 16 (11) ◽  
pp. 7142-7147 ◽  
Author(s):  
Thang Pham ◽  
Ashley L. Gibb ◽  
Zhenglu Li ◽  
S. Matt Gilbert ◽  
Chengyu Song ◽  
...  
Keyword(s):  
Boron Nitride ◽  
Electron Irradiation ◽  
Elevated Temperatures ◽  
Hexagonal Boron Nitride ◽  
Induced Defects ◽  
Irradiation Induced Defects

scholarly journals Computational Study on the Interaction and Moving of ssDNA through Nanosheets

Crystals ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 1019
Author(s):  
Mansoor H. Alshehri
Keyword(s):  
Boron Nitride ◽  
Hexagonal Boron Nitride ◽  
Computational Study ◽  
Graphene Nanosheets ◽  
Minimum Energy ◽  
Binding Energies ◽  
Jones Potential ◽  
Boron Nitride Nanosheets ◽  
Continuous Approach ◽  
Energy Location

The adsorption characteristics and moving through nanopores of a single-stranded deoxyribonucleic acid (ssDNA) molecule on monolayers, such ashexagonal boron nitride and graphene nanosheets, were studied using the continuous approach with the 6–12 Lennard–Jones potential function. The ssDNA molecule is assumed to be at a distance l above the sheet, and the relation between the minimum energy location and the perpendicular distance of the ssDNA molecule from the nanosheet surface is found. In addition, by assuming that there is a hole in the surface of the nanosheet as a pore, the interaction energies for the ssDNA molecule moving through the pore in the surface of the nanosheet (used to calculate the radius p of the hole) are obtained, which provides the minimum energies. Furthermore, a comparative study with graphene was performed in order to compare with hexagonal boron nitride nanosheets. Our results indicate that the binding energies of the ssDNA onto graphene and hexagonal boron nitride nanosheets are approximately 15.488 and 17.582 (kcal/mol), corresponding to perpendicular distances of l=20.271 and l=20.231 Å, respectively. In addition, we observe that the ssDNA molecule passes through graphene and hexagonal boron nitride nanopores when the gap radius p>7.5 Å. Our results provide critical insights to understand and develop the interactions and translocation of DNA molecules with and through nanosheets.

Correction to Formation and Dynamics of Electron-Irradiation-Induced Defects in Hexagonal Boron Nitride at Elevated Temperatures

Nano Letters ◽  
2017 ◽  
Vol 17 (6) ◽  
pp. 3992-3992
Author(s):  
Thang Pham ◽  
Ashley L. Gibb ◽  
Zhenglu Li ◽  
S. Matt Gilbert ◽  
Chengyu Song ◽  
...  
Keyword(s):  
Boron Nitride ◽  
Electron Irradiation ◽  
Elevated Temperatures ◽  
Hexagonal Boron Nitride ◽  
Induced Defects ◽  
Irradiation Induced Defects

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