scholarly journals Synthesis of “Silica – Carbon Nanotubes” Composite and Investigation of its Properties

2015 ◽  
Vol 17 (2) ◽  
pp. 95
Author(s):  
V.V. Chesnokov ◽  
A.S. Chichkan ◽  
V.S. Luchihina ◽  
E.A. Paukshtis ◽  
V.N. Parmon ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Thermal Stability ◽  
Calcination Temperature ◽  
Amorphous Silica ◽  
Oxidation Rate ◽  
Silica Film ◽  
Silica Layer ◽  
Active Hydrogen ◽  
Order Of Magnitude ◽  
Thermal Stability Of

A new method for synthesis of CNT-SiO2 composite was developed. Oligomethylhydridesiloxane (OMHS) was used as the SiO2 precursor. The presence<br />of active hydrogen in the composition of OMHS made it possible to obtain chemical<br />interaction between the surface of carbon nanotubes and the deposited silica layer. The effect of the silica film on the CNT oxidizing ability was studied. It was found that the oxidation rate of the CNT-SiO2 composite decreases approximately by an order of magnitude in comparison with as-prepared CNT. The morphology and<br />structure of amorphous silica obtained after oxidation of the CNT-SiO2 composite<br />were studied. The thermal stability of the CNT-SiO2 composite was also studied. The CNT-SiO2 composite was found to be thermally stable up to temperatures of 1100-1200 ºC. An increase in the calcination temperature to 1300 ºC leads to segregation of the CNT-SiO2 composite into individual components: CNT and SiO2 particles.

Metal catalyst residues in carbon nanotubes decrease the thermal stability of carbon nanotube/silicone composites

Carbon ◽  
2011 ◽  
Vol 49 (13) ◽  
pp. 4138-4148 ◽  
Author(s):  
Zhuo Li ◽  
Wei Lin ◽  
Kyoung-Sik Moon ◽  
Stewart J. Wilkins ◽  
Yagang Yao ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Thermal Stability ◽  
Carbon Nanotube ◽  
Metal Catalyst ◽  
Thermal Stability Of

scholarly journals ALUMINA PHASE TRANSFORMATION FROM THERMAL DECOMPOSITION OF AMMONIUM ALUM SYNTHESIZED FROM KANKARA KAOLIN

2017 ◽  
Vol 36 (3) ◽  
pp. 822-828
Author(s):  
SG Bawa ◽  
AS Ahmed ◽  
PC Okonkwo
Keyword(s):  
Thermal Stability ◽  
Phase Transformation ◽  
Calcination Temperature ◽  
Starting Material ◽  
Gamma Alumina ◽  
X Ray ◽  
Alumina Phase ◽  
Ammonium Alum ◽  
Alpha Alumina ◽  
Thermal Stability Of

Thermal stability of transitional alumina phases produced from ammonium alum using Kankara kaolin as starting material was studied. Wet beneficiation method was employed to purify the starting material, after which it was calcined and dealuminated with sulphuric acid. The elemental composition, mineralogical, and physiological analyses were carried out using X-ray fluorescence (XRF), X-ray diffraction (XRD) and Brunauer-Emmett-Teller (BET) techniques respectively. The ammonium alum was thermally treated by varying the calcination temperature from 700 to 1200°C and varying the time of calcination from 1 to 4 h. The formation of gamma alumina began at calcination temperature of 825°C for calcination time of 3 h, which was found to be lower than reported works of 900°C. It was found to be stable at higher temperature of 1125°C, above which phase transformation to alpha alumina was observed. The observed wide range of thermal stability of the gamma alumina phase gives it good advantage to be used for high temperature applications, such as support for catalyst promoters. Alpha alumina phase formation began at 1150°C and was fully formed at 1200°C. BET specific surface area of 166 m2/g was obtained for the gamma alumina phase which was high enough for it application as support for catalyst, catalyst and adsorbent. http://dx.doi.org/10.4314/njt.v36i3.23

Enhanced thermal stability of multi-walled carbon nanotubes after coating with polyaniline salt

2012 ◽  
Vol 97 (8) ◽  
pp. 1405-1414 ◽  
Author(s):  
Zuzana Morávková ◽  
Miroslava Trchová ◽  
Elena Tomšík ◽  
Juraj Čechvala ◽  
Jaroslav Stejskal
Keyword(s):  
Carbon Nanotubes ◽  
Thermal Stability ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes ◽  
Thermal Stability Of
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