Large cryogenic storage of hydrogen in carbon nanotubes at low pressures

2002 ◽  
Vol 17 (9) ◽  
pp. 2209-2216 ◽  
Author(s):  
B. B. Pradhan ◽  
A. A. Harutyunyan ◽  
D. Stojkovic ◽  
J. J. Grossman ◽  
P. Zhang ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Binding Energy ◽  
Tube Wall ◽  
Zero Point ◽  
Isosteric Heat ◽  
Low Pressure ◽  
Strong Adsorption ◽  
Point Motion ◽  
Walled Carbon Nanotubes ◽  
Low Pressures

We report up to 6 wt% storage of H2 at 2 atm and T = 77 K in processed bundles of single-walled carbon nanotubes. The hydrogen storage isotherms are completely reversible; D2 isotherms confirmed this anomalous low-pressure adsorption and also revealed the effects of quantum mechanical zero point motion. We propose that our postsynthesis treatment of the sample improves access for hydrogen to the central pores within individual nanotubes and may also create a roughened tube surface with an increased binding energy for hydrogen. Such an enhancement may be needed to understand the strong adsorption at low pressure. We obtained an experimental isosteric heat qst = 125 ± 5 meV. Calculations are also presented that indicate disorder in the tube wall enhances the binding energy of H2.

Large Cryogenic Storage of Hydrogen in Carbon Nanotubes at Low Pressures

2001 ◽  
Vol 706 ◽  
Author(s):  
B. K. Pradhan ◽  
A. Harutyunyan ◽  
D. Stojkovic ◽  
P. Zhang ◽  
M. W. Cole ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Zero Point ◽  
Isosteric Heat ◽  
Low Pressure ◽  
Quantum Mechanical ◽  
Strong Adsorption ◽  
Point Motion ◽  
Post Synthesis ◽  
Walled Carbon Nanotubes ◽  
Low Pressures

AbstractWe report (6 wt %) storage of H2 at T=77 K in processed bundles of single-walled carbon nanotubes at P=2 atmospheres. The hydrogen storage isotherms are completely reversible. D2 isotherms confirm this anomalous low-pressure adsorption and further reveal the effects of quantum mechanical zero point motion. We propose that our post-synthesis treatment of the sample not only improves access for hydrogen to the central pores within individual nanotubes, but also may create a roughened tube surface with an enhanced binding energy for hydrogen. Such an enhancement is needed to understand the strong adsorption at low pressure. We obtain an experimental isosteric heat qst=125 ± 5 meV for processed SWNT materials.

Isosteric Heat of Argon Adsorbed on Single-Walled Carbon Nanotubes Prepared by Laser Ablation

2005 ◽  
Vol 109 (19) ◽  
pp. 9317-9320 ◽  
Author(s):  
Vaiva Krungleviciute ◽  
Luke Heroux ◽  
Aldo D. Migone ◽  
Christopher T. Kingston ◽  
Benoit Simard
Keyword(s):  
Carbon Nanotubes ◽  
Laser Ablation ◽  
Single Walled Carbon Nanotubes ◽  
Isosteric Heat ◽  
Single Walled Carbon ◽  
Walled Carbon Nanotubes

Exciton Binding Energy in Semiconducting Single-Walled Carbon Nanotubes

2005 ◽  
Vol 109 (33) ◽  
pp. 15671-15674 ◽  
Author(s):  
Ying-Zhong Ma ◽  
Leonas Valkunas ◽  
Sergei M. Bachilo ◽  
Graham R. Fleming
Keyword(s):  
Carbon Nanotubes ◽  
Binding Energy ◽  
Single Walled Carbon Nanotubes ◽  
Exciton Binding Energy ◽  
Single Walled Carbon ◽  
Walled Carbon Nanotubes

scholarly journals Binding energy and mechanical stability of two parallel and crossing carbon nanotubes

2015 ◽  
Vol 471 (2180) ◽  
pp. 20150229 ◽  
Author(s):  
Junhua Zhao ◽  
Yue Jia ◽  
Ning Wei ◽  
Timon Rabczuk
Keyword(s):  
Carbon Nanotubes ◽  
Binding Energy ◽  
Mechanical Stability ◽  
Critical Length ◽  
High Accuracy ◽  
Molecular Dynamics Calculations ◽  
Continuum Modelling ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes ◽  
The Continuum

The binding energy between two parallel (and two crossing) single-walled (and multi-walled) carbon nanotubes (CNTs) is obtained by continuum modelling of the van der Waals interaction between them. The dependence of the binding energy on their diameters, number of walls and crossing angles is systematically analysed. The critical length for the mechanical stability and adhesion of the CNTs is determined by the function of E i I i , h and γ , where E i I i , h and γ are the CNTs bending stiffness, distance and binding energy between them, respectively. Checking against full atom molecular dynamics calculations show that the continuum solution has high accuracy. The established analytical solutions should be of great help for designing nanoelectromechanical devices.

scholarly journals Antimony Selenide Crystals Encapsulated within Single Walled Carbon Nanotubes-A DFT Study

2009 ◽  
Vol 6 (s1) ◽  
pp. S147-S152 ◽  
Author(s):  
Navaratnarajah Kuganathan
Keyword(s):  
Carbon Nanotubes ◽  
Binding Energy ◽  
Density Functional ◽  
Density Functional Theory Calculations ◽  
Single Walled Carbon Nanotubes ◽  
Binding Energies ◽  
Single Walled Carbon ◽  
Transmission Electron ◽  
Antimony Selenide ◽  
Walled Carbon Nanotubes

The structure and binding energies of antimony selenide crystals encapsulated within single-walled carbon nanotubes are studied using density functional theory. Calculations were performed on the simulated Sb2Se3structure encapsulated within single walled nanotube to investigate the perturbations on the Sb2Se3crystal and tube structure and electronic structure and to estimate the binding energy. The calculated structures are in good agreement with the experimental high resolution transmission electron microscopy images of the Sb2Se3@SWNT. The calculated binding energy shows that larger diameter tube could accommodate the Sb2Se3crystals exothermically. Minimal charge transfer is observed between nanotube and the Sb2Se3crystals.

Thermoelectric Study of Hydrogen Storage in Carbon Nanotubes

2001 ◽  
Vol 706 ◽  
Author(s):  
G. U. Sumanasekera ◽  
C. K. W. Adu ◽  
B. K. Pradhan ◽  
G. Chen ◽  
H. E. Romero ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Binding Energy ◽  
Thermoelectric Power ◽  
Single Walled Carbon Nanotubes ◽  
Thermoelectric Transport ◽  
Linear Behavior ◽  
Thermoelectric Transport Properties ◽  
Process Studies ◽  
Walled Carbon Nanotubes

AbstractIn situ resistivity and thermoelectric power (S) have been used to study the nature of the adsorption of hydrogen in bundles of single-walled carbon nanotubes for H2 pressure P <1 atm and temperatures 77 K<T<500 K. Isothermal plots of S vs. Δρ/ρ0 are found to exhibit linear behavior as a function of gas coverage, consistent with a physisorption process. Studies of S, ρ at T = 500 K as a function of pressure exhibit a plateau at a pressure P~40 Torr, the same pressure where the H % measurements suggest the highest binding energy sites are being saturated. The effects of H2 exposure at 500 K on the thermoelectric transport properties are fully reversible.

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