scholarly journals Hypersonic impact properties of pristine and hybrid single and multi-layer C3N and BC3 nanosheets

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Fatemeh Molaei ◽  
Kasra Einalipour Eshkalak ◽  
Sadegh Sadeghzadeh ◽  
Hossein Siavoshi
Keyword(s):  
Energy Absorption ◽  
2D Materials ◽  
Scaling Law ◽  
Single Layer ◽  
Interlayer Spacing ◽  
Variable Number ◽  
Dynamics Simulation ◽  
Absorption Energy ◽  
Ballistic Properties ◽  
Boron Nanostructures

AbstractCarbon, nitrogen, and boron nanostructures are promising ballistic protection materials due to their low density and excellent mechanical properties. In this study, the ballistic properties of C3N and BC3 nanosheets against hypersonic bullets with Mach numbers greater than 6 were studied. The critical perforation conditions, and thus, the intrinsic impact strength of these 2D materials were determined by simulating ballistic curves of C3N and BC3 monolayers. Furthermore, the energy absorption scaling law with different numbers of layers and interlayer spacing was investigated, for homogeneous or hybrid configurations (alternated stacking of C3N and the BC3). Besides, we created a hybrid sheet using van der Waals bonds between two adjacent sheets based on the hypervelocity impacts of fullerene (C60) molecules utilizing molecular dynamics simulation. As a result, since the higher bond energy between N–C compared to B-C, it was shown that C3N nanosheets have higher absorption energy than BC3. In contrast, in lower impact speeds and before penetration, single-layer sheets exhibited almost similar behavior. Our findings also reveal that in hybrid structures, the C3N layers will improve the ballistic properties of BC3. The energy absorption values with a variable number of layers and variable interlayer distance (X = 3.4 Å and 4X = 13.6 Å) are investigated, for homogeneous or hybrid configurations. These results provide a fundamental understanding of ultra-light multilayered armors' design using nanocomposites based on advanced 2D materials. The results can also be used to select and make 2D membranes and allotropes for DNA sequencing and filtration.

scholarly journals Hypersonic Impact Properties of Pristine and Hybrid Single and Multi-layer C3N and BC3 Nanosheets

2020 ◽  
Author(s):  
Sadegh Sadeghzadeh ◽  
Kasra Einalipour Eshkalak ◽  
Fatemeh Molaei ◽  
Hossein Siavoshi
Keyword(s):  
2D Materials ◽  
Variable Number ◽  
Dynamics Simulation ◽  
Two Dimensional ◽  
Hypervelocity Impacts ◽  
Absorption Energy ◽  
Ballistic Protection ◽  
Fundamental Understanding ◽  
Ballistic Properties ◽  
Boron Nanostructures

Abstract Two-dimensional (2D) materials are competitive candidates replacing or supplementing conventional semiconductors due to their atomically uniform thickness. To observe and exploit the unique properties of two-dimensional (2D) materials, it is therefore vital to obtain clean and repeatable interfaces. Also, carbon, nitrogen, and boron nanostructures are promising ballistic protection materials due to their low density and excellent mechanical properties. In this study, we evaluated the ballistic properties of C3N and BC3 nanosheets against the hypersonic bullets with Mach number greater than 6. Besides, we created a hybrid sheet using van der Waals bonds between them based on the hypervelocity impacts of fullerene (C60) molecules utilizing molecular dynamics simulation. In the following, the ballistic properties of different structures were examined, and it was shown that C3N nanosheets have higher absorption energy than BC3 after C60 penetration. In contrast, in lower impact speeds and before penetration, single-layers exhibited almost similar behavior. Our findings also reveal that in hybrid structures, the C3N layers will improve the ballistic properties of BC3. The energy absorption values with a variable number of layers and interlayer distance are investigated, for homogeneous or hybrid configurations (stacking of C3N and BC3). In this work, we have discussed two interlayer distances of X = 3.4Å and 4X = 13.6Å for different configurations. These results provide a fundamental understanding of ultra-light multilayered armors' design using nanocomposites based on advanced 2D materials. It can also be used to select and make 2D membranes and allotropes for DNA sequencing and filtration.

Effect of Varied Layer-Content/Thickness on Ballistic Performance of a Functionally Graded Al2O3/ZrO2 Material

2018 ◽  
Vol 928 ◽  
pp. 243-248 ◽  
Author(s):  
Yu Liang Chen ◽  
Chin Yu Huang
Keyword(s):  
Energy Absorption ◽  
Ceramic Composite ◽  
Single Layer ◽  
Areal Density ◽  
Wave Impedance ◽  
Functionally Graded ◽  
Ballistic Performance ◽  
Graded Material ◽  
Stress Damage ◽  
Transmission And Reflection

This study compared the ballistic performance of alumina (Al2O3)/ zirconia (ZrO2) functionally graded material (FGM) specimens with various levels of thickness and ZrO2 content and a pure Al2O3 single-layer ceramic composite (PCM). Ballistic tests were conducted with 0.3-inch armor-piercing (AP) projectiles, and finite element code LS-DYNA was used to examine energy absorption, stress distribution, and ceramic cone failure in the specimens. The findings are as follows: First, regarding energy absorption per unit of areal density, the 5% FGMs had the highest ballistic performance, which increased by up to 8%. By contrast, the ballistic performance of the 15% FGMs declined significantly to lower than that of the PCM. Second, the capability of the ceramic cone to withstand stress damage and projectiles was significantly greater in the 5% FGMs than in the 15% FGMs. Third, the wave impedance variations increased with the ZrO2 content in each layer, thereby enhancing the interactions between impact waves and aggravating ceramic damage. Thus, the intensities of transmission and reflection waves in the 15% FGMs increased, thereby causing reductions in its ballistic performance.

scholarly journals Stone–Wales defects preserve hyperuniformity in amorphous two-dimensional networks

2021 ◽  
Vol 118 (3) ◽  
pp. e2016862118
Author(s):  
Duyu Chen ◽  
Yu Zheng ◽  
Lei Liu ◽  
Ge Zhang ◽  
Mohan Chen ◽  
...  
Keyword(s):  
2D Materials ◽  
Single Layer ◽  
Salient Feature ◽  
Density Fluctuations ◽  
Wave Number ◽  
Static Structure Factor ◽  
Two Dimensional ◽  
Static Structure ◽  
Topological Transformation ◽  
Amorphous Graphene

Disordered hyperuniformity (DHU) is a recently discovered novel state of many-body systems that possesses vanishing normalized infinite-wavelength density fluctuations similar to a perfect crystal and an amorphous structure like a liquid or glass. Here, we discover a hyperuniformity-preserving topological transformation in two-dimensional (2D) network structures that involves continuous introduction of Stone–Wales (SW) defects. Specifically, the static structure factor S(k) of the resulting defected networks possesses the scaling S(k)∼kα for small wave number k, where 1≤α(p)≤2 monotonically decreases as the SW defect concentration p increases, reaches α≈1 at p≈0.12, and remains almost flat beyond this p. Our findings have important implications for amorphous 2D materials since the SW defects are well known to capture the salient feature of disorder in these materials. Verified by recently synthesized single-layer amorphous graphene, our network models reveal unique electronic transport mechanisms and mechanical behaviors associated with distinct classes of disorder in 2D materials.

Molecular dynamics simulation of a nanofluidic energy absorption system: effects of the chiral vector of carbon nanotubes

2018 ◽  
Vol 20 (7) ◽  
pp. 5140-5148 ◽  
Author(s):  
Sayed Hossein Ganjiani ◽  
Alireza Hossein Nezhad
Keyword(s):  
Carbon Nanotubes ◽  
Molecular Dynamics ◽  
Molecular Dynamics Simulation ◽  
Energy Absorption ◽  
Small Volume ◽  
Dynamics Simulation ◽  
Absorption System ◽  
Chiral Vector ◽  
Nanofluidic System

A Nanofluidic Energy Absorption System (NEAS) is a novel nanofluidic system with a small volume and weight.

Controlling ion transport in a C2N-based nanochannel with tunable interlayer spacing

2020 ◽  
Vol 22 (29) ◽  
pp. 16855-16861
Author(s):  
You-sheng Yu ◽  
Rong-ri Tan ◽  
Hong-ming Ding
Keyword(s):  
Molecular Dynamics ◽  
Molecular Dynamics Simulation ◽  
Ion Transport ◽  
Interlayer Spacing ◽  
Dynamics Simulation ◽  
Feasible Method ◽  
Transport Behavior

By using all-atom molecular dynamics simulation, we proposed a new and feasible method to control the transport behavior of ions via changing the interlayer spacing between two C2N membranes.

scholarly journals Pulsed laser deposition of single-layer MoS2 on Au(111): from nanosized crystals to large-area films

2019 ◽  
Vol 1 (2) ◽  
pp. 643-655 ◽  
Author(s):  
Francesco Tumino ◽  
Carlo S. Casari ◽  
Matteo Passoni ◽  
Valeria Russo ◽  
Andrea Li Bassi
Keyword(s):  
Pulsed Laser Deposition ◽  
2D Materials ◽  
Optoelectronic Devices ◽  
Pulsed Laser ◽  
Single Layer ◽  
Laser Deposition ◽  
Large Area ◽  
Molybdenum Disulphide ◽  
High Quality ◽  
Nanosized Crystals

Molybdenum disulphide (MoS2) is a promising material for heterogeneous catalysis and novel 2D optoelectronic devices. In this work, single-layer MoS2 is synthesized on Au(111) by pulsed laser deposition, showing the potentialities of this technique in the synthesis of high-quality 2D materials films.

Performance Analysis of a Multijunction Photovoltaic Cell Based on Cadmium Selenide and Cadmium Telluride

2014 ◽  
Vol 875-877 ◽  
pp. 1058-1062
Author(s):  
Sartaz Tabinna Salim ◽  
Sayeda Anika Amin ◽  
K.M.A. Salam ◽  
Mir Abdulla Al Galib
Keyword(s):  
Performance Analysis ◽  
Solar Energy ◽  
Cadmium Selenide ◽  
Cadmium Telluride ◽  
Energy Absorption ◽  
Spectral Range ◽  
Single Layer ◽  
Photovoltaic Cell ◽  
Photon Absorption ◽  
Reflective Coating

A multi-junction photovoltaic cell based on group II-VI Cadmium Selenide (CdSe) and Cadmium Telluride (CdTe) with a single layer anti-reflective coating of Silicon Di Oxide (SiO2) has been introduced. In this paper we have performed a comparison of solar energy absorption of CdSe/CdTe cell with existing single and multi-junction cells. The cell has shown significant photon absorption in the spectral range of 300nm-2000nm with an efficiency of 34.6% under terrestrial AM1.5, 1 sun condition.

Molecular Dynamics Simulation of Rarefied Gaseous Flows in Nano-Channels

2013 ◽  
Vol 446-447 ◽  
pp. 12-17
Author(s):  
Zhi Hong Mao ◽  
Fu Bing Bao ◽  
Yuan Lin Huang
Keyword(s):  
Molecular Dynamics ◽  
Molecular Dynamics Simulation ◽  
Slip Velocity ◽  
Average Velocity ◽  
Single Layer ◽  
Simulation Method ◽  
Dynamics Simulation ◽  
Channel Height ◽  
Gaseous Flows ◽  
Pressure Driven

Molecular dynamics simulation method was used to study the rarefied gaseous flows in nanochannels. A pressure-driven force was introduced to drive the gas to flow between two parallel walls. The effects of driven force magnitude and channel height were investigated. The results show that a single layer of gaseous molecules is adsorbed on the wall surface. The density of adsorption layer decreases with the increase of channel height, but doesnt vary with driven force. The velocity profile across the channel has the traditional parabolic shape. The average velocity and gas slip velocity on the wall increase linearly with the increase of pressure-driven force. The gas slip velocity decreases linearly with the increase of channel height. The ratio of slip to average velocity decreases linearly with the increase of channel height.

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