The dielectric response of pentagonal defects in multilayer graphene nano-cones has been studied by electron energy loss spectroscopy and ab initio simulations. At the cone apex, a strong modification of the dielectric response is observed below the energy of the π plasmon resonance. This is attributed to π → π* interband transitions induced by topology-specific resonant π bonding states as wel...

In this study, hydrothermal synthesis was used to prepare α-Ni(OH) 2 , which is a steady-state photocatalytic material. Furthermore, ball milling for the 1:1 loading of with nano-alumina (Al O 3 ), hexagonal boron nitride (h-BN), and activated carbon (AC). The performances these four materials in degradation fracturing flowback fluid were investigated under synergistic catalytic effect ozone. r...

Water was investigated on a h-BN/Rh(111) nanomesh template using variable temperature scanning tunneling microscopy (STM) and density functional theory (DFT) calculations. Below 52 K, two distinct phases self-assemble within the 3.2 nm unit cell of the nanomesh that consists of "holes" and "wires". In the 2 nm holes, an ordered phase of nano-ice crystals with about 40 molecules is found. The ic...

We prove an useful upper bound for the measure of spherical caps. Consider the uniformly distributed measure σn−1 on the Euclidean unit sphere Sn−1 ⊂ R. On the sphere, as among only a handful other spaces, the isoperimetric problem is completely solved. This goes back to Lévy [Lé] and Schmidt [Sch] and states that caps have the minimal measure of a boundary among all sets with a fixed mass. For...

Single-layer graphene has many remarkable properties but does not lend itself as a material for light-emitting devices result of its lack band gap. This limitation can be overcome by controlled stacking layers. Exploiting the unique Dirac cone structure graphene, we demonstrate twist-controlled resonant light emission from graphene/hexagonal boron nitride (h-BN)/graphene tunnel junctions. We ob...

We investigated the electronic and optical properties of bilayer AB stacked Boron Nitrogen vacancies in hexagonal Nitride (h-BN) using density functional theory (DFT). The states (DOS) band structure showed that vacancy h-BN results a magnetic conducting ground state. gap energy ranges from 4.56 eV for pristine BN to 0.12 single bilayer. Considering presence 1,3,4-Boron vacancy, half metallic c...

The purpose of this paper is to study the effects use boron nitride (BN) and other conventional nanoparticles (Al2O3, CuO TiO2) on pressure drop heat transfer in a microchannel. governing equations for forced fluid flow were worked out by using fluent computational dynamics (CFD) code. Computational results collected from CFD code Al2O3 as nano-particle compared with numerical values used liter...

In this paper, the high purity bisphenol-A diglycidyl ether (DGEBA) epoxy resin (D.E.R 332), which is mainly used as filament winding, electrical laminates and encapsulation applications, was used as a host. The epoxy resins were loaded with nano-SiO2 and nano-BN in different loading concentrations, and then test of the AC/DC breakdown strength has been performed. It has been observed that the ...