Size Scale Effect on Generated Electric Potential of Nano Composite Electrical Generators

2012 ◽  
Author(s):  
Kasra Momeni
Keyword(s):  
Elastic Modulus ◽  
Scale Effect ◽  
Electric Potential ◽  
Zno Nanowires ◽  
Surface Model ◽  
Multiscale Approach ◽  
Nano Composite ◽  
Size Scale ◽  
Cylindrical Coordinate ◽  
Axisymmetric Configuration

A multiscale approach is pursued for modeling the size-scale effect on generated electric potential by nanocomposite electrical generators of ZnO nanowires. A core-surface model is used for capturing the effect of size-scale on elastic modulus of ZnO NWs. In this model, a surface with different elastic modulus as of the core of NW was considered. Using linear elasticity and axisymmetric configuration of this problem, closed form governing equations are derived in cylindrical coordinate system. Parametric studied are performed for sample cases to demonstrate application of the developed model. It is shown that ZnO nanowires with larger aspect ratio and smaller diameters have higher performance and can produce higher electric potential.

In situobservation of size-scale effects on the mechanical properties of ZnO nanowires

2011 ◽  
Vol 22 (26) ◽  
pp. 265712 ◽  
Author(s):  
A Asthana ◽  
K Momeni ◽  
A Prasad ◽  
Y K Yap ◽  
R S Yassar
Keyword(s):  
Mechanical Properties ◽  
Scale Effects ◽  
Zno Nanowires ◽  
Size Scale

MEMS Testbed for Mechanical Testing of Nanowires

2005 ◽  
Author(s):  
A. A. Desai ◽  
M. A. Haque ◽  
P. C. Eklund
Keyword(s):  
Elastic Modulus ◽  
Mechanical Testing ◽  
Zno Nanowires ◽  
Test Bed ◽  
One Dimensional ◽  
Post Buckling ◽  
Mems Device ◽  
Slender Columns ◽  
Very High

In this paper, we present a MEMS test bed for electromechanical testing of nanowires and nanotubes. The MEMS device exploits the mechanics of post buckling deformation of slender columns to achieve very high force and displacement resolution. The proposed technique involves manipulating the nanowire or nanotube to the device site and hence is applicable to any type of one-dimensional solid. Initial experiments on semiconducting ZnO nanowires estimated the elastic modulus to be 1 GPa.

Statistical analysis of scale effect on equivalent elastic modulus of jointed rock masses

2016 ◽  
Vol 9 (3) ◽  
Author(s):  
Haijiang Ni ◽  
Weiya Xu ◽  
Wei Wang ◽  
Bo Lu ◽  
Anchi Shi ◽  
...  
Keyword(s):  
Elastic Modulus ◽  
Statistical Analysis ◽  
Scale Effect ◽  
Jointed Rock ◽  
Rock Masses ◽  
Jointed Rock Masses

scholarly journals Fabrication and Mechanical Properties of Chitosan-Montmorillonite Nano-Composite

2012 ◽  
Vol 512-515 ◽  
pp. 1746-1750 ◽  
Author(s):  
Z.J. Shou ◽  
H.R. Le ◽  
S.Y. Qu ◽  
R.A. Rothwell ◽  
R.E. Mackay
Keyword(s):  
Waste Water ◽  
Mechanical Properties ◽  
Elastic Modulus ◽  
Water Treatment ◽  
Fracture Strength ◽  
Mechanical Behaviour ◽  
High Speed ◽  
Waste Water Treatment ◽  
Nano Composite ◽  
The Matrix

Chitosan has found various applications in gastrointestinal stent, biomedical implants as well as an effective absorbent in waste water treatment. However, the material suffers from low strength and large shrinkage upon dehydration. The current project is aimed to develop a process to fabricate chitosan composites with the addition of functionalised montmorillonite nanoparticles and to examine the effect of ceramic content on the mechanical behavior of the composites. This paper describes the fabrication of chitosan with montmorrillonite composites and the mechanical testing of the samples and the mechanical behaviour of the composites, as well as the observations of the microstructure. The effects of composition and microstructure on the mechanical properties of the composite are investigated. The results indicate that the nanoparticles are dispersed uniformly in the matrix up to 40wt% using high speed homogeniser. The elastic modulus increases monotonically with the addition of nanoparticles, but the fracture strength drops due to the defects introduced by the nanoparticles.

scholarly journals Exact solutions of bending deflection for single-walled BNNTs based on the classical Euler–Bernoulli beam theory

2020 ◽  
Vol 9 (1) ◽  
pp. 961-970
Author(s):  
Dong Yawei ◽  
Zhang Yang ◽  
Yan Jianwei
Keyword(s):  
Boron Nitride ◽  
Scale Effect ◽  
Hexagonal Boron Nitride ◽  
Continuum Theory ◽  
Beam Theory ◽  
Boron Nitride Nanotubes ◽  
Multiscale Approach ◽  
Scale Parameters ◽  
Atomic Force ◽  
Space Case

AbstractAt the nanolevel, a classical continuum approach seems to be inapplicable to evaluate the mechanical behaviors of materials. With the introduction of scale parameter, the scale effect can be reasonably described by the modified continuum theory. For boron nitride nanotubes (BNNTs), the scale effect can be reflected by the curvature and the dangling bonds at both ends, mainly the former for a slender tube. This study aims to achieve a good capability of classical Euler–Bernoulli theory to directly predict the bending behaviors of single-walled BNNTs without introducing scale parameters. Elastic properties of BNNTs involving the scale effect have been first conducted by using an atomistic-continuum multiscale approach, which is directly constructed based on the atomic force field. The well-determined hexagonal boron nitride sheet is inherited in the present study of single-walled BNNTs which can be viewed as rolling up a boron nitride sheet into a seamless hollow cylinder. Euler–Bernoulli theory solution of bending deflection on the basis of the present thickness is found to be much closer to the atomistic-continuum simulation results than the commonly used interlayer space. Case studies with different tubular lengths, radii and constraints are investigated, and from which the yielded scattered scale parameters in modified continuum theories are discussed.

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