Henry constant and isosteric heat at zero-loading for gas adsorption in carbon nanotubes

2008 ◽  
Vol 10 (48) ◽  
pp. 7293 ◽  
Author(s):  
D. D. Do ◽  
H. D. Do ◽  
A. Wongkoblap ◽  
D. Nicholson
Keyword(s):  
Carbon Nanotubes ◽  
Gas Adsorption ◽  
Isosteric Heat ◽  
Henry Constant

scholarly journals Residual Gas Adsorption and Desorption in the Field Emission of Titanium-Coated Carbon Nanotubes

Materials ◽  
2019 ◽  
Vol 12 (18) ◽  
pp. 2937 ◽  
Author(s):  
Huzhong Zhang ◽  
Detian Li ◽  
Peter Wurz ◽  
Yongjun Cheng ◽  
Yongjun Wang ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Field Emission ◽  
Photoelectron Spectroscopy ◽  
Gas Adsorption ◽  
Mass Spectrometry Analysis ◽  
Emission Characteristic ◽  
Spectrometry Analysis ◽  
Pristine Cnts ◽  
Xps Characterization ◽  
Residual Gas

Titanium (Ti)-coated multiwall carbon nanotubes (CNTs) emitters based on the magnetron sputtering process are demonstrated, and the influences of modification to CNTs on the residual gas adsorption, gas desorption, and their field emission characteristic are discussed. Experimental results show that Ti nanoparticles are easily adsorbed on the surface of CNTs due to the “defects” produced by Ar+ irradiation pretreatment. X-ray photoelectron spectroscopy (XPS) characterization showed that Ti nanoparticles contribute to the adsorption of ambient molecules by changing the chemical bonding between C, Ti, and O. Field emission of CNTs coated with Ti nanoparticles agree well with the Fowler–Nordheim theory. The deviation of emission current under constant voltage is 6.3% and 8.6% for Ti-CNTs and pristine CNTs, respectively. The mass spectrometry analysis illustrated that Ti-coated CNTs have a better adsorption capacity at room temperature, as well as a lower outgassing effect than pristine CNTs after degassing in the process of field emission.

The Effect of Gas Adsorption on Carbon Nanotubes Properties

2006 ◽  
Vol 3 (5) ◽  
pp. 664-669 ◽  
Author(s):  
Seifollah Jalili ◽  
Roya Majidi
Keyword(s):  
Carbon Nanotubes ◽  
Gas Adsorption

Effect of Operating Temperature on Characteristics of Single-Walled Carbon Nanotubes Gas Sensor

2005 ◽  
Vol 486-487 ◽  
pp. 485-488 ◽  
Author(s):  
Hong Quang Nguyen ◽  
Mai Van Trinh ◽  
Jeung Soo Huh
Keyword(s):  
Carbon Nanotubes ◽  
Gas Sensor ◽  
Gas Adsorption ◽  
Operating Temperature ◽  
High Sensitivity ◽  
Single Walled Carbon Nanotubes ◽  
Fast Response ◽  
Carrier Gas ◽  
Single Walled Carbon ◽  
Walled Carbon Nanotubes

The effect of operating temperature on characteristics of single-walled carbon nanotubes (SWNT) based gas sensor was investigated. SWNT-based sensor was fabricated from SWNT powder (Iljin Nanotech, Korea) by screen-printing method. SWNT powder (30 mg, AP grade) was dispersed into 0.78 gram a-terpineol (Aldrich) by ultrasonic vibration for 1 hour then stirred manually for 1 hour to increase adhesion. From this condensed solution, a thick film of SWNT was printed onto alumina substrates. The film then was sintered at 300oC for 2 hours to remove residual impurities. Upon exposure to some gases such as nitrogen, ammonia or nitric oxide, resistance of the sensor dramatically changes due to gas adsorption. In our experiments, SWNT-based sensor was employed to detect NH3 gas in N2 ambience. After saturated of N2, the sensor exposes to NH3 with various concentrations (from 5 ppm to 100 ppm, diluted by N2 as carrier gas). This sensor exhibits a fast response, high sensitivity but slow recovery at room temperature. By heating at high temperature and increasing the flow-rate of carrier gas, NH3 gas desorbs easily and recovery of the sensor improved. The heating also influenced the characteristics of sensors such as response and reproducibility. Other special changes in electric property of SWNT-based sensor caused by heating are also discussed.

scholarly journals Isosteric Heat of Single Gas Adsorption on an Energetically Homogeneous Adsorbent Surface

1996 ◽  
Vol 13 (2) ◽  
pp. 105-114 ◽  
Author(s):  
J.K. Garbacz ◽  
A. Kopkowfki ◽  
A. Dabrowski
Keyword(s):  
Gas Adsorption ◽  
Isosteric Heat ◽  
Model Parameters ◽  
Experimental Systems ◽  
Adsorbent Surface ◽  
Monolayer Adsorption

An expression for the isosteric heat of the partially mobile monolayer adsorption of a single gas on a homogeneous adsorbent surface has been derived. Optimization of the model parameters has been performed for selected experimental systems.

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.

scholarly journals Electrical properties of irradiated individual multi-walled carbon nanotubes after gas adsorption

2018 ◽  
Vol 443 ◽  
pp. 012034
Author(s):  
D V Sokolov ◽  
N A Davletkildeev ◽  
V V Bolotov ◽  
I A Lobov
Keyword(s):  
Carbon Nanotubes ◽  
Electrical Properties ◽  
Gas Adsorption ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

Intriguing differences in hydrogen adsorption in CPO-27 materials induced by metal substitution

2015 ◽  
Vol 3 (9) ◽  
pp. 4827-4839 ◽  
Author(s):  
Mali H. Rosnes ◽  
Martin Opitz ◽  
Matthias Frontzek ◽  
Wiebke Lohstroh ◽  
Jan Peter Embs ◽  
...  
Keyword(s):  
Comparative Study ◽  
Gas Adsorption ◽  
Hydrogen Adsorption ◽  
Isosteric Heat ◽  
Heat Of Adsorption ◽  
Hydrogen Gas ◽  
The Other ◽  
Metal Substitution ◽  
Isosteric Heat Of Adsorption ◽  
Open Metal Sites

We present a comparative study of hydrogen gas adsorption experiments on CPO-27–Cu and –Mn. The initial isosteric heat of adsorption in CPO-27–Cu is low for a material containing open metal sites and in contrast to the other members of the CPO-27 series, including the Mn compound.

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