Role of size of hexagonal boron nitride particles on tribo-performance of nano and micro oils

2018 ◽  
Vol 30 (8) ◽  
pp. 441-456 ◽  
Author(s):  
Manoj Kumar Gupta ◽  
Jayashree Bijwe ◽  
Meghashree Padhan
Keyword(s):  
Boron Nitride ◽  
Hexagonal Boron Nitride

scholarly journals It's a Gas: Oxidative Dehydrogenation of Propane over Boron Nitride Catalysts

2020 ◽  
Author(s):  
Peter Kraus ◽  
R. Peter Lindstedt
Keyword(s):  
Low Temperature ◽  
Boron Nitride ◽  
Gas Phase ◽  
Oxidative Dehydrogenation ◽  
Hexagonal Boron Nitride ◽  
Combustion Model ◽  
Low Temperature Combustion ◽  
Oxidative Dehydrogenation Of Propane ◽  
Temperature Combustion

We investigate the role of gas-phase phenomena in the heterogeneous oxidative dehydrogenation of propane over hexagonal boron nitride. We apply a recently developed gas-phase combustion model for low-temperature combustion of propane and couple it with several surface microkinetic mechanisms to probe the selectivity limits using the open-source flame solver Cantera. We show that while the conversion of propane is surface-driven, the selectivities are significantly influenced by the gas-phase, especially when dilute catalyst beds are used.<br>

scholarly journals AB-stacked nanosheet-based hexagonal boron nitride

2021 ◽  
Vol 77 (2) ◽  
Author(s):  
Jae-Kap Lee ◽  
Jin-Gyu Kim ◽  
K. P. S. S. Hembram ◽  
Seunggun Yu ◽  
Sang-Gil Lee
Keyword(s):  
Boron Nitride ◽  
Hexagonal Boron Nitride ◽  
Metastable Phase ◽  
Stacking Sequence ◽  
Lateral Growth ◽  
X Ray Diffraction ◽  
X Ray ◽  
High Pressure High Temperature ◽  
Crystalline Growth

Hexagonal boron nitride (h-BN) has been generally interpreted as having an AA stacking sequence. Evidence is presented in this article indicating that typical commercial h-BN platelets (∼10–500 nm in thickness) exhibit stacks of parallel nanosheets (∼10 nm in thickness) predominantly in the AB sequence. The AB-stacked nanosheet occurs as a metastable phase of h-BN resulting from the preferred texture and lateral growth of armchair (110) planes. It appears as an independent nanosheet or unit for h-BN platelets. The analysis is supported by simulation of thin AB films (2–20 layers), which explains the unique X-ray diffraction pattern of h-BN. With this analysis and the role of pressure in commercial high-pressure high-temperature sintering (driving nucleation and parallelizing the in-plane crystalline growth of the nuclei), a growth mechanism is proposed for 2D h-BN (on a substrate) as `substrate-induced 2D growth', where the substrate plays the role of pressure.

Analysis of the fluorescence of mechanically processed defect-laden hexagonal boron nitride and the role of oxygen in catalyst deactivation

2019 ◽  
Vol 118 (4) ◽  
pp. 153-158
Author(s):  
David J. Nash ◽  
Katerina L. Chagoya ◽  
Alan Felix ◽  
Fernand E. Torres-Davila ◽  
Tao Jiang ◽  
...  
Keyword(s):  
Boron Nitride ◽  
Catalyst Deactivation ◽  
Hexagonal Boron Nitride

Role of defects in the process of graphene growth on hexagonal boron nitride from atomic carbon

2014 ◽  
Vol 105 (19) ◽  
pp. 191610 ◽  
Author(s):  
J. Dabrowski ◽  
G. Lippert ◽  
T. Schroeder ◽  
G. Lupina
Keyword(s):  
Boron Nitride ◽  
Hexagonal Boron Nitride ◽  
Atomic Carbon ◽  
Graphene Growth

scholarly journals Surfactant-exfoliated 2D hexagonal boron nitride (2D-hBN): role of surfactant upon the electrochemical reduction of oxygen and capacitance applications

2017 ◽  
Vol 5 (8) ◽  
pp. 4103-4113 ◽  
Author(s):  
Aamar F. Khan ◽  
Michael P. Down ◽  
Graham C. Smith ◽  
Christopher W. Foster ◽  
Craig E. Banks
Keyword(s):  
Boron Nitride ◽  
Electrochemical Reduction ◽  
Hexagonal Boron Nitride ◽  
Aqueous Media ◽  
Sodium Cholate ◽  
Electrochemical Reduction Of Oxygen

Surfactant-exfoliated 2D hexagonal boron nitride (2D-hBN) nanosheets are fabricated using the surfactant sodium cholate in aqueous media and are explored towards the electrochemical reduction of oxygen.

scholarly journals Examining the role of hexagonal boron nitride nanoparticles as an additive in the lubricating oil and studying its application

2020 ◽  
Vol 234 (1-2) ◽  
pp. 19-36
Author(s):  
Sangharatna Ramteke ◽  
H Chelladurai
Keyword(s):  
Boron Nitride ◽  
Friction And Wear ◽  
Hexagonal Boron Nitride ◽  
Mechanical Systems ◽  
Friction Reduction ◽  
Lubricating Oil ◽  
Tribological Characteristics ◽  
Gravimetric Analysis ◽  
Reduction Behavior

Lubricating oil plays an important role in minimizing the friction and wear of many mechanical systems. The additives present in the conventional lubricant are inadequate to reduce the friction and wear of today’s mechanical systems. However, the use of these additives has a significant effect on the environment due to their fast chemical degradation. In recent years, nanoparticle-based lubricant has attracted great attention due to their friction reduction behavior. Therefore, it is of great importance to examine the role of nanoparticle addition in the conventional lubricant and its influence on the tribological characteristics of the mechanical systems. Hence, this research work focused on the formulation of hexagonal boron nitride nanoparticle-based nanofluids and its effect on the tribological characteristics of cylinder liner and piston rings of a realistic diesel engine. The different concentrations of hBN nanoparticle-based nanofluids were formulated and characterized using the ultraviolet–visible spectroscopy and the thermal gravimetric analysis. The results of the experimental analysis showed that hBN nanoparticles as an additive in the lubricating oil exhibited better anti-wear and friction reduction behavior than the conventional base oil 20W40.

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