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carbon nanotubes

Zhengwei Li's picture

Theoretical studies on lattice-oriented growth of single-walled carbon nanotubes on sapphire

In this work, a theoretical study is performed to quantitatively understand the van der Waals interactions between single-walled carbon nanotubes (SWNTs) and sapphire substrates. The energetically preferred alignment directions of SWNTs on A-, R- and M-planes and the random alignment on the C-plane predicted by this study are all in good agreement with experiments. It is also shown that smaller SWNTs have better alignment than larger SWNTs due to their stronger interaction with sapphire substrate.

Antonino Favata's picture

An analytical benchmark for MD codes: testing and correcting LAMMPS

In the attached paper, recently appeared on Computer Physics Communications, we have proposed an analytical benchmark and a simple consistent Mathematica program for graphene and carbon nanotubes, that may serve to test any molecular dynamics code implemented with REBO potentials. By exploiting the benchmark, we checked results produced by LAMMPS (Large-scale Atomic/Molecular Massively Parallel Simulator) when adopting the second generation Brenner potential, we made evident that this code in its current implementation produces results which are offset from those of the benchmark by a significant amount, and provided evidence of the reason.

Ramathasan Thevamaran's picture

A few experimental studies on the dynamic behavior of foam-like aligned carbon nanotubes

I'm posting a few experimental studies we have conducted on the dynamic behavior of hierarchical fibrous materials, using vertically aligned carbon nanotubes as a model material. I hope these will be useful to those who are interested in buckle-instabilities, multiscale behavior, and energy absorption mechanisms.

An overview:

Antonino Favata's picture

Graphene and Carbon Nanotubes are self-stressed

In the attached paper we have shown that graphene and carbon nanotubes are in a self-stress state in their natural equilibrium state, that is, the state prior to the application of external loads. We have identified different sources of self-stresses and accurately evaluated them; we have shown that they are by no means negligible with respect to load-related nanostresses.

mortezaamjadi's picture

Carbon Nanotubes-Ecoflex Nanocomposite for Strain Sensing With Ultra-High Stretchability

We developed highly stretchable, flexible and very soft conductors based on the carbon nanotubes (CNTs)-silicone rubber (Ecoflex®) nanocomposite thin films. The resistance of the CNTs-Ecoflex nanocomposite thin film was recovered to its original value under cyclic loading/unloading for strains as large as 510%. Failure strain of the CNTs-Ecoflex nanocomposite was measured to be about ~ 1380% showing its ultra-high stretchability and robustness. As an application of our highly stretchable conductors, we utilized them as skin-mountable and wearable strain sensors for human motion detection.

Yuli Chen's picture

Effects of geometrical and mechanical properties of fiber and matrix on composite fracture toughness

Composites reinforced by thinner fibers are intensively studied in recent years and expected to have better
mechanical properties. With development of nanotechnology, the diameter of fiber can be as thin as
several nanometers, such as nanofibers and nanotubes. Then, do these thinner fibers definitely result in
composites with better mechanical properties? In this paper, the toughening effect of reinforcing fibers in
composites is investigated based on the three-level failure analysis model. It is found that thinner

Hamid Torabi's picture

Micromechanics of collective buckling in CNT turfs

Complex structures consisting of intertwined, nominally vertical carbon nanotubes (CNTs) are called turfs. Under uniform compression experiments, CNT turfs exhibit irreversible collective buckling of a layer preceded by reorientation of CNT segments. Experimentally observed independence of the buckling stress and the buckling wavelength on the turf width suggests the existence of an intrinsic material length.

How can a zero length torsional spring element be modeled in ANSYS?

Aoa

Hello
brothers

Currently,
I‘m working on the determination of the mechanical properties of carbon nanotubes
for different loading cases using ANSYS software ( i need to use them in my
model). My Finite Element model of graphene and carbon nanotube is working fine with beam188 element, but I have
some technical problems in my simulation. These problem are summarized in
points as follow;

priyank_upadhyaya's picture

Lockheed Martin funded Post-Doctoral Position: Carbon Nano Structured Materials at Masdar Institute, Abu Dhabi

Applications are invited for the position of "Post‐doctoral Research Fellow" as part of a multi-disciplinary collaborative project funded by Lockheed Martin. The project's Principal Investigators are:

Dr. Kumar Shanmugam, Mechanical Engineering
Dr. Matteo Chiesa, Materials Science & Engineering
Dr. Amal Al Ghaferi, Materials Science & Engineering

Seeking for PhD position

Hello I am Prakhar Gupta (Final Year Mechanical engineering, undergraduate). My
area of interests are
Carbon
Nanotubes, Design engineering, Mechanics of Solids
. I am engaged in one of the project for my degree on

Yong Zhu's picture

Buckling of Aligned Carbon Nanotubes as Stretchable Conductors: A New Manufacturing Strategy

We systematically investigated the interesting electric response of the aligned CNT ribbons under mechanical strain. We found that CNTs slide on a PDMS substrate under tension, but buckle under compression (releasing). Such an irreversible mechanical deformation is responsible for the observed irreversibility in the electric resistance upon the first stretching/releasing.

Michael A. McCarthy's picture

Seeking postdoctoral researcher - Molecular Dynamics of CNT-nanocomposites

The Irish Research Council (http://www.ircset.ie/tabid/64/default.aspx) has a funding scheme for postdoctoral researchers. I am seeking someone to submit an application to IRCSET to obtain funding to work within my group, in Modelling of CNT-based nanocomposites. The chances of success are high for candidates with a good research record. The deadline for applications is December 8th.

td's picture

Distinct Element Method Simulations of Carbon Nanotube Systems

What a methodology and a software designed for large-scale engineering problems have to do with carbon nanotubes? See J. Nanotechnol. Eng. Med. 1, 041009 (2010).

searching for PhD

I would like to persue my PhD specializing in carbon nanotubes appliance with in biomaterials or materials. I have a master degree from KTH (Stockholm) in biomedical materials, started my PhD in Karolinska institute (stockholm) for drug delivery vehicles (Dec 2009- march 2010). Mechanical engineering bachelor from the American university in Cairo; majored in material process and manufacturing & industrial science.

Carbon nanotubes

 

Is there any relation between the carbon nanotube chirality (m,n) or diameter and the nonlocal elasticity parameter (i.e., Scale coefficient e0a)  where a = C-C bond length???

 

 

 

 

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Narendar 

IIsc

Banglore

India

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