scholarly journals Monitoring oxidation of multiwalled carbon nanotubes by Raman spectroscopy

2007 ◽  
Vol 38 (6) ◽  
pp. 728-736 ◽  
Author(s):  
Sebastian Osswald ◽  
Mickael Havel ◽  
Yury Gogotsi
Keyword(s):  
Carbon Nanotubes ◽  
Raman Spectroscopy ◽  
Multiwalled Carbon Nanotubes ◽  
Multiwalled Carbon

scholarly journals Effect of Size of Multiwalled Carbon Nanotubes Dispersed in Gear Oils for Improvement of Tribological Properties

2018 ◽  
Vol 2018 ◽  
pp. 1-13 ◽  
Author(s):  
Kodanda Rama Rao Chebattina ◽  
V. Srinivas ◽  
N. Mohan Rao
Keyword(s):  
Carbon Nanotubes ◽  
Raman Spectroscopy ◽  
Ball Milling ◽  
Multiwalled Carbon Nanotubes ◽  
Tribological Properties ◽  
Extreme Pressure ◽  
Multiwalled Carbon ◽  
Pristine Mwcnts ◽  
Gear Oil ◽  
The Stability

The aim of the paper is to investigate the effect of size of multiwalled carbon nanotubes (MWCNTs) as additives for dispersion in gear oil to improve the tribological properties. Since long pristine MWCNTs tend to form clusters compromising dispersion stability, they are mildly processed in a ball mill to shorten the length and stabilized with a surfactant before dispersing in lubricant. Investigations are made to assess the effect of ball milling on the size and structure of MWCNTs using electron microscopy and Raman spectroscopy. The long and shortened MWCNTs are dispersed in EP 140 gear oil in 0.5% weight. The stability of the dispersed multiwalled carbon nanotubes is evaluated using light scattering techniques. The antiwear, antifriction, and extreme pressure properties of test oils are evaluated on a four-ball wear tester. It is found that ball milling of MWCNTs has a strong effect on the stability and tribological properties of the lubricant. From Raman spectroscopy, it is found that ball milling time of up to 10 hours did not produce any defects on the surface of MWCNTs. The stability of the lubricant and the antiwear, antifriction, and extreme pressure properties have improved significantly with dispersion shortened MWCNTs. Ball milling for longer periods produces defects on the surface of MWCNTs reducing their advantage as oil additives.

Experimental and theoretical studies on the mechanism for chemical oxidation of multiwalled carbon nanotubes

RSC Advances ◽  
2014 ◽  
Vol 4 (55) ◽  
pp. 28826-28831 ◽  
Author(s):  
B. M. Maciejewska ◽  
M. Jasiurkowska-Delaporte ◽  
A. I. Vasylenko ◽  
K. K. Kozioł ◽  
S. Jurga
Keyword(s):  
Electron Microscopy ◽  
Carbon Nanotubes ◽  
Transmission Electron Microscopy ◽  
Raman Spectroscopy ◽  
Multiwalled Carbon Nanotubes ◽  
Chemical Oxidation ◽  
Theoretical Studies ◽  
Multiwalled Carbon ◽  
Transmission Electron ◽  
Experimental And Theoretical Studies

In this study, the oxidation of multiwalled carbon nanotubes (MWCNTs) sonicated and/or refluxed in acids (H2SO4/HNO3) was investigated using a combination of high-resolution transmission electron microscopy, Raman spectroscopy, Fourier transform infrared spectroscopy, and ab initio computational methods.

Defect structure of multiwalled carbon nanotubes studied by Raman spectroscopy

2011 ◽  
Vol 47 (5) ◽  
pp. 471-474 ◽  
Author(s):  
E. M. Baitinger ◽  
N. A. Vekesser ◽  
I. N. Kovalev ◽  
Yu. I. Ryabkov ◽  
V. V. Viktorov
Keyword(s):  
Carbon Nanotubes ◽  
Raman Spectroscopy ◽  
Multiwalled Carbon Nanotubes ◽  
Defect Structure ◽  
Multiwalled Carbon

Raman spectroscopy of polystyrene nanofibers—Multiwalled carbon nanotubes composites

2013 ◽  
Vol 275 ◽  
pp. 23-27 ◽  
Author(s):  
Dorina M. Chipara ◽  
Javier Macossay ◽  
Ana V.R. Ybarra ◽  
A.C. Chipara ◽  
Thomas M. Eubanks ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Raman Spectroscopy ◽  
Multiwalled Carbon Nanotubes ◽  
Multiwalled Carbon

Purity assessment of multiwalled carbon nanotubes by Raman spectroscopy

2007 ◽  
Vol 101 (6) ◽  
pp. 064307 ◽  
Author(s):  
Roberta A. DiLeo ◽  
Brian J. Landi ◽  
Ryne P. Raffaelle
Keyword(s):  
Carbon Nanotubes ◽  
Raman Spectroscopy ◽  
Multiwalled Carbon Nanotubes ◽  
Multiwalled Carbon ◽  
Purity Assessment

scholarly journals Эволюция многостенных углеродных нанотрубок и гибридных наноструктур на их основе в процессе получения алюмоматричных композиционных материалов

2019 ◽  
Vol 45 (2) ◽  
pp. 22
Author(s):  
А.В. Аборкин ◽  
К.С. Хорьков ◽  
А.М. Объедков ◽  
К.В. Кремлев ◽  
А.Ю. Изобелло ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Raman Spectroscopy ◽  
Composite Material ◽  
Aluminum Alloy ◽  
Powder Metallurgy ◽  
Multiwalled Carbon Nanotubes ◽  
Hybrid Nanostructures ◽  
Multiwalled Carbon ◽  
Hybrid Filler ◽  
Material Formation

AbstractComposite materials based on AMg2 aluminum alloy reinforced by additions of 0.05 wt % multiwalled carbon nanotubes (MWCNTs) or Al/MWCNT hybrid nanostructures have been obtained by powder metallurgy techniques. The evolution of MWCNTs and Al/MWCNT hybrid nanostructures at various stages of powder composite material formation has been studied by Raman spectroscopy. It is established that Al/MWCNT hybrid filler is subjected to lower damage and less favors the formation of Al_4C_3 phase during isothermal consolidation stage as compared to the case of nonmodified MWNTs.

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