The synthesis, properties and uses of carbon materials with helical morphology

Shaikjee, Ahmed; Coville, Neil J.

doi:10.1016/j.jare.2011.05.007

Cited by 110 publications

(71 citation statements)

References 115 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…1 [1][2][3][4][5]. CNCs show interesting mechanical and electromagnetic properties related to their unique morphologies and they have therefore been proposed for use in a number of attractive applications such as electromagnetic wave absorbers [6][7][8], where wavelength-selectivity is required [8], or as vibration dampeners [9,10], among others.…”

Section: Introductionmentioning

confidence: 99%

The effect of a tin oxide buffer layer for the high yield synthesis of carbon nanocoils

Hirahara

Nakayama

2013

Carbon

View full text Add to dashboard Cite

Section: Introductionmentioning

confidence: 99%

The effect of a tin oxide buffer layer for the high yield synthesis of carbon nanocoils

Hirahara

Nakayama

2013

Carbon

View full text Add to dashboard Cite

“…lawrence 27 , et al have carried out a 3-point bend test of a carbon nanofiber using AFM tip. While they have estimated the elastic modulus values of the carbon nanofibre within a range of 6 GPa -207 GPa, Shaikjee and Coville 28 have reported the elastic modulus value of a carbon nanocoil as 100 GPa.…”

Section: Results and Discussion 31 In-situ Transmission Electron Micmentioning

confidence: 99%

Structure-property Characterisation at Nanoscale using In-situ TEM and SEM

Sarkar¹,

Mondal²,

Kumar³

et al. 2016

Def. Sc. Jl.

View full text Add to dashboard Cite

In-situ transmission Electron MicroscopyA powerful and unique approach has been developed by integrating the structural information of a material provided by TEM with the properties measured from the same material or with the conditions of structural changes by in-situ TEM 2-3 . This is also an ideal technique for understanding the propertystructure relationship of individual nanostructures. In-situ electron microscopy is an emerging technique for real time visualisation of micro-structural changes of a specimen under some applied constraints inside microscope. In this study, in-situ nanoindentation experimentation on a carbon nanocoil inside transmission electron microscope has been reported. The elastic modulus of the carbon nanocoil is found to be 177 GPa. Similar experiments are also carried out on carbon nanotubes, but force response of carbon nanotubes is beyond the limit of sensors presently available. The in-situ dissolution behaviour of the secondary phases of a 7xxx series aluminum alloy under high vacuum condition in scanning electron microscope (SEM) in the temperature range of 350 °C to 400 °C has been reported. We report for the first time using in-situ SEM technique that dissolution of the MgZn 2 -base phase present as eutectic and divorced eutectic forms could start at a temperature as low as 300 °C, although the usual homogenisation temperature of such alloys is always > 450 °C. Furthermore, the kinetics of dissolution of such phases, particularly when present in fine eutectic phase mixture, is significantly faster than what is observed under atmospheric pressure. It has been found that modification of surface composition under high vacuum condition plays a key role in the low temperature dissolution processes. It has further been found that the dissolution process does not start with the thinning of the inter-dendritic channels phase as proposed for Al-Zn-Mg-Cu alloys, rather it occurs by a combination of 'spheroidisation' and thinning process called 'the thinning, discontinuation, and full dissolution' mechanism. Results of the in-stu experiments under high vacuum are compared with the ex-situ dissolution experiments under normal atmospheric pressure.

show abstract

“…Secondly, the existence of interfacial polarization, electronic dipole polarization, natural resonance and its associated relaxation also greatly improved the microwave absorption property of the hybrids. Thirdly, helical CNTs have special morphology with larger specific surface area and well dispersion of Fe 3 C. Meanwhile, some defects such as vacancies, pentagons and heptagons exist in helical CNTs [47] with the features of short-range order and long-range disorder. Then the electronic spin attributed to these defects and polarized center have the profound effect on the response of helical CNTs [23].…”

Section: à2 (F)mentioning

confidence: 99%

Fe3C/helical carbon nanotube hybrid: Facile synthesis and spin-induced enhancement in microwave-absorbing properties

Tang

Jian

et al. 2016

Composites Part B: Engineering

View full text Add to dashboard Cite

a b s t r a c tExploring effective microwave absorption materials is always a challenge especially in the relatively low frequency range of 2e8 GHz and broad absorption band. Here we developed a Fe 3 C/helical carbon nanotube (HCNT) hybrid structures synthesized via catalytic chemical vapor deposition (CCVD) using Fe 3 O 4 nanoparticles as catalyst. The microwave-absorbing characteristics of such hybrid nanomaterials were investigated based on the transmission line theory through the evaluation of the experimental data including complex permittivity and permeability. Considering the reaction temperature range of 400 e750 C, the as-prepared hybrid synthesized at 700 C can be adjusted to have effective performance of RL value less than À10 dB in the relatively lower frequency ranged from 2.9 GHz to 9.9 GHz at the thickness range of 2e5 mm. Furthermore, the hybrid in case of 750 C bears bandwidths with RL lower than À10 dB from 7.3 GHz to 18 GHz and the minimum RL is about À21 dB. The observed advantageous reflection loss was attributed to the pronounced impedance match owing to the reasonable synergistic effect between magnetic nanoparticles and HCNTs.

show abstract

The synthesis, properties and uses of carbon materials with helical morphology

Cited by 110 publications

References 115 publications

The effect of a tin oxide buffer layer for the high yield synthesis of carbon nanocoils

The effect of a tin oxide buffer layer for the high yield synthesis of carbon nanocoils

Structure-property Characterisation at Nanoscale using In-situ TEM and SEM

Fe3C/helical carbon nanotube hybrid: Facile synthesis and spin-induced enhancement in microwave-absorbing properties

Contact Info

Product

Resources

About