Effect of graphene layer thickness on effective modulus of 3D CNT/Graphene nanostructures

2015 ◽  
Vol 04 (02) ◽  
pp. 1550010
Author(s):  
J. Joseph ◽  
Y. C. Lu
Keyword(s):  
Mechanical Properties ◽  
Layer Thickness ◽  
Graphene Layer ◽  
Effective Properties ◽  
Three Dimensional ◽  
Graphene Layers ◽  
Out Of Plane ◽  
Vertically Aligned ◽  
3D Nanostructure ◽  
Graphene Nanostructure

Three-dimensional CNT/Graphene nanostructure is consisted of vertically aligned carbon nanotube pillars grown directly on parallel graphene layers. The effect of graphene layer thickness on mechanical properties of the 3D nanostructure is analyzed. Overall, when the graphene layers experience the out-of-plane loading, the effective properties (Young's modulus, shear modulus, and major Poisson's ratio) of the 3D CNT/Graphene structure are significantly dependent upon the thickness of graphene layers. When the graphene layers experience the in-plane loading, the effective properties of the 3D CNT/Graphene structure depend upon the graphene thickness initially and then remain relatively unchanged as the thickness increases. It is found that the optimal performance of the 3D CNT/Graphene structure requires a minimum of thickness for the graphene layers, g/t > 5.

Fabrication and mechanical properties of three-dimensional enhanced lattice truss sandwich structures

2018 ◽  
Vol 22 (5) ◽  
pp. 1594-1611 ◽  
Author(s):  
Wen Yang ◽  
Jian Xiong ◽  
Li-Jia Feng ◽  
Chong Pei ◽  
Lin-Zhi Wu
Keyword(s):  
Mechanical Properties ◽  
Sandwich Structures ◽  
Three Dimensional ◽  
Truss Structures ◽  
Unit Cell Size ◽  
Out Of Plane ◽  
Parent Alloy ◽  
Shear Characteristics ◽  
New Type ◽  
Alloy Properties

Topological-reinforcement and material-strengthening were used and employed to improve the mechanical properties of lattice truss sandwich structures. This new type of three-dimensional aluminum alloy lattice truss (named enhanced lattice truss) sandwich structure, with a relative density ranging from 1.7% to 4.7%, was designed and fabricated by interlocking and vacuum-brazing method. The out-of-plane compression and shear properties of the enhanced lattice truss sandwich structures (both as-brazed and age-hardened cores) were experimentally and analytically investigated. Good correlations between analytical predictions and experiment results were achieved. Experimental results showed that the mechanical properties of the enhanced lattice truss cores were sensitive to the unit-cell size and parent-alloy properties (i.e. inelastic buckling and tangential modulus). The compressive and shear characteristics of enhanced lattice truss sandwich structures were discussed and found superior to competing lattice truss structures in low density area (0.046–0.124 g/cm3) of material property charts. The combination of topological-reinforcement and material-strengthening provided a way to achieve lightweight sandwich structures with high specific strengths and low densities.

Precise control of chemical vapor deposition graphene layer thickness using NixCu1−x alloys

2015 ◽  
Vol 3 (7) ◽  
pp. 1463-1467 ◽  
Author(s):  
Hyonkwang Choi ◽  
Yeongjin Lim ◽  
Minjeong Park ◽  
Sehui Lee ◽  
Younsik Kang ◽  
...  
Keyword(s):  
Chemical Vapor Deposition ◽  
Layer Thickness ◽  
Vapor Deposition ◽  
Graphene Layer ◽  
Chemical Vapor ◽  
Graphene Layers ◽  
Precise Control ◽  
Thermal Chemical Vapor Deposition ◽  
Chemical Vapor Deposition Graphene

We investigated a simple but effective method to precisely control the desired number of graphene layers on the NixCu1−x alloy substrates by thermal chemical vapor deposition.

scholarly journals 3D strain-induced superconductivity in La2CuO4+δ using a simple vertically aligned nanocomposite approach

2019 ◽  
Vol 5 (4) ◽  
pp. eaav5532 ◽  
Author(s):  
Eun-Mi Choi ◽  
Angelo Di Bernardo ◽  
Bonan Zhu ◽  
Ping Lu ◽  
Hen Alpern ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Strain Engineering ◽  
Excess Oxygen ◽  
Superconducting Transition ◽  
New Approach ◽  
Out Of Plane ◽  
High Pressure Oxygen ◽  
Vertically Aligned ◽  
Additional Process

A long-term goal for superconductors is to increase the superconducting transition temperature, TC. In cuprates, TC depends strongly on the out-of-plane Cu-apical oxygen distance and the in-plane Cu-O distance, but there has been little attention paid to tuning them independently. Here, in simply grown, self-assembled, vertically aligned nanocomposite thin films of La2CuO4+δ + LaCuO3, by strongly increasing out-of-plane distances without reducing in-plane distances (three-dimensional strain engineering), we achieve superconductivity up to 50 K in the vertical interface regions, spaced ~50 nm apart. No additional process to supply excess oxygen, e.g., by ozone or high-pressure oxygen annealing, was required, as is normally the case for plain La2CuO4+δ films. Our proof-of-concept work represents an entirely new approach to increasing TC in cuprates or other superconductors.

scholarly journals Morphology and properties of the graphene layer on the copper substrate

2015 ◽  
Vol 17 (4) ◽  
pp. 104-108
Author(s):  
Katarzyna Pietrzak ◽  
Wiesława Olesińska ◽  
Cezary Strąk ◽  
Robert Siedlec ◽  
Andrzej Gładki
Keyword(s):  
Mechanical Properties ◽  
Wear Resistance ◽  
Graphene Layer ◽  
Copper Substrate ◽  
Thermal Reduction ◽  
Copper Surface ◽  
Tribological Test ◽  
Graphene Layers ◽  
Reduction Processes

Abstract The aim of the work presented in the article was to clarify controversial comments about anti-corrosion and mechanical properties of graphene coatings, deposited on copper substrates. It was designed special experimental cycle comprising: preparation of graphene forms and copper, the observation of layers Cu / GO (rGO) after the thermal reduction processes and oxidative test in air at 150°C temperature and 350 h in time. The resulting coatings and graphene layers were subjected to tribological test for hardness. The observed differences in the continuity of the coverage copper surface by graphene forms, allowed to understand the macroscopic effect of increased hardness and wear resistance layers rGO/Cu.

scholarly journals Three-dimensional networks of superconducting NbSe2 flakes with nearly isotropic large upper critical field

2021 ◽  
Vol 5 (1) ◽  
Author(s):  
Togo Takahashi ◽  
Chisato Ando ◽  
Mitsufumi Saito ◽  
Yasumitsu Miyata ◽  
Yusuke Nakanishi ◽  
...  
Keyword(s):  
Magnetic Fields ◽  
Critical Field ◽  
Three Dimensional ◽  
Upper Critical Field ◽  
Synthetic Approach ◽  
X Ray Diffraction ◽  
Out Of Plane ◽  
Vertically Aligned ◽  
Superconducting Applications ◽  
Spin Momentum

AbstractIncreasing the upper critical field Hc2 in superconductors is one of the most significant requirements for superconducting applications. Two-dimensional (2D) noncentrosymmetric NbSe2 is a promising candidate because its pair breaking is protected by the spin-momentum locking effect, resulting in a giant in-plane Hc2 (~50 T). However, the strong anisotropy of 2D NbSe2 suppresses the robustness of out-of-plane Hc2 (<5 T). To overcome this issue, we propose a synthetic approach to produce superconducting NbSe2 films with a nearly isotropic large Hc2. Scalable selenization methods are tailored to create 3D superconducting networks in which 2D NbSe2 flakes are vertically aligned to the substrates. The angle-resolved magneto-transports reveal enhanced Hc2 values that exceed 20 T for arbitrary directions under externally applied magnetic fields. The isotropic nature of Hc2 is attributed to the averaging intrinsic anisotropy of NbSe2 through 3D structured films, which was determined by X-ray diffraction measurements. The proposed synthetic approach will provide a new method for creating practical superconductors that are robust against magnetic fields.

Biotemplated facile synthesis of three‐dimensional micro/nanoporous tin oxide: improving the flammable and mechanical properties of flexible PVC

2019 ◽  
Vol 14 (8) ◽  
pp. 828-830 ◽  
Author(s):  
Weihua Meng ◽  
Weihong Wu ◽  
Weiwei Zhang ◽  
Luyao Cheng ◽  
Yunhong Jiao ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Tin Oxide ◽  
Three Dimensional ◽  
Facile Synthesis

scholarly journals Effective Complex Properties for Three-Phase Elastic Fiber-Reinforced Composites with Different Unit Cells

Technologies ◽  
2021 ◽  
Vol 9 (1) ◽  
pp. 12
Author(s):  
Federico J. Sabina ◽  
Yoanh Espinosa-Almeyda ◽  
Raúl Guinovart-Díaz ◽  
Reinaldo Rodríguez-Ramos ◽  
Héctor Camacho-Montes
Keyword(s):  
Effective Properties ◽  
Elastic Fiber ◽  
Fiber Reinforced Composites ◽  
Reinforced Composites ◽  
Fiber Reinforced ◽  
Effective Coefficients ◽  
Three Phase ◽  
Out Of Plane ◽  
Local Problems ◽  
Unit Cells

The development of micromechanical models to predict the effective properties of multiphase composites is important for the design and optimization of new materials, as well as to improve our understanding about the structure–properties relationship. In this work, the two-scale asymptotic homogenization method (AHM) is implemented to calculate the out-of-plane effective complex-value properties of periodic three-phase elastic fiber-reinforced composites (FRCs) with parallelogram unit cells. Matrix and inclusions materials have complex-valued properties. Closed analytical expressions for the local problems and the out-of-plane shear effective coefficients are given. The solution of the homogenized local problems is found using potential theory. Numerical results are reported and comparisons with data reported in the literature are shown. Good agreements are obtained. In addition, the effects of fiber volume fractions and spatial fiber distribution on the complex effective elastic properties are analyzed. An analysis of the shear effective properties enhancement is also studied for three-phase FRCs.

scholarly journals Is Dialdehyde Chitosan a Good Substance to Modify Physicochemical Properties of Biopolymeric Materials?

2021 ◽  
Vol 22 (7) ◽  
pp. 3391
Author(s):  
Sylwia Grabska-Zielińska ◽  
Alina Sionkowska ◽  
Ewa Olewnik-Kruszkowska ◽  
Katarzyna Reczyńska ◽  
Elżbieta Pamuła
Keyword(s):  
Mechanical Properties ◽  
Tissue Engineering ◽  
Physicochemical Properties ◽  
Silk Fibroin ◽  
Three Dimensional ◽  
Microscopy Imaging ◽  
Maximum Deformation ◽  
One Step ◽  
Chitosan Blends ◽  
Fourier Transfer Infrared Spectroscopy

The aim of this work was to compare physicochemical properties of three dimensional scaffolds based on silk fibroin, collagen and chitosan blends, cross-linked with dialdehyde starch (DAS) and dialdehyde chitosan (DAC). DAS was commercially available, while DAC was obtained by one-step synthesis. Structure and physicochemical properties of the materials were characterized using Fourier transfer infrared spectroscopy with attenuated total reflectance device (FTIR-ATR), swelling behavior and water content measurements, porosity and density observations, scanning electron microscopy imaging (SEM), mechanical properties evaluation and thermogravimetric analysis. Metabolic activity with AlamarBlue assay and live/dead fluorescence staining were performed to evaluate the cytocompatibility of the obtained materials with MG-63 osteoblast-like cells. The results showed that the properties of the scaffolds based on silk fibroin, collagen and chitosan can be modified by chemical cross-linking with DAS and DAC. It was found that DAS and DAC have different influence on the properties of biopolymeric scaffolds. Materials cross-linked with DAS were characterized by higher swelling ability (~4000% for DAS cross-linked materials; ~2500% for DAC cross-linked materials), they had lower density (Coll/CTS/30SF scaffold cross-linked with DAS: 21.8 ± 2.4 g/cm3; cross-linked with DAC: 14.6 ± 0.7 g/cm3) and lower mechanical properties (maximum deformation for DAC cross-linked scaffolds was about 69%; for DAS cross-linked scaffolds it was in the range of 12.67 ± 1.51% and 19.83 ± 1.30%) in comparison to materials cross-linked with DAC. Additionally, scaffolds cross-linked with DAS exhibited higher biocompatibility than those cross-linked with DAC. However, the obtained results showed that both types of scaffolds can provide the support required in regenerative medicine and tissue engineering. The scaffolds presented in the present work can be potentially used in bone tissue engineering to facilitate healing of small bone defects.

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