Fabrication of Novel Alumina Composites Reinforced by SiC Nano-Particles and Multi-Walled Carbon Nanotubes

2009 ◽  
pp. 245-255
Author(s):  
Kaleem Ahmad ◽  
Wei Pan
Keyword(s):  
Carbon Nanotubes ◽  
Nano Particles ◽  
Multi Walled Carbon Nanotubes ◽  
Alumina Composites ◽  
Walled Carbon Nanotubes

scholarly journals Methotrexate Detection Based On The Optical Properties Of Carbon Nanotubes And Silver Nano Particles Nanocomposites

2021 ◽  
Vol 7 (3) ◽  
pp. 1323
Author(s):  
Fida Mohammad Mohammadi
Keyword(s):  
Carbon Nanotubes ◽  
Refractive Index ◽  
Nonlinear Refractive Index ◽  
Nano Particles ◽  
Optical Measurements ◽  
Carbon Electrode ◽  
Linear Absorption Coefficient ◽  
Linear Absorption ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

<p>In this experiment, glassy carbon electrode with multi walled carbon nanotubes<br />nanocomposites have been prepared in different concentration in order to see if<br />methotrexate is anticancer drug. For the purpose of characterizing the structures,<br />nanocomposites were analyzed by scanning electron microscope. Optical measurements of different concentrations were conducted by z-scan method and the results show that by rising the concentration, nonlinear refractive index and linear absorption coefficient increases. The values of nonlinear refractive index are in orders of 𝟏𝟎−𝟖 𝒄𝒎𝟐 𝒘.</p>

PREPARATION AND MICROSTRUCTURE OF MCNT/Cu NANOCOMPOSITE

2009 ◽  
Vol 23 (06n07) ◽  
pp. 1461-1466
Author(s):  
WANLI GU ◽  
WENBIN SHENG
Keyword(s):  
Carbon Nanotubes ◽  
Ball Milling ◽  
Fracture Process ◽  
Milled Powder ◽  
Milling Process ◽  
Nano Particles ◽  
Ball Milling Process ◽  
Structure Changes ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

The fracture process and the structure changes of the multi-walled carbon nanotubes (MCNT) during the mechanical ball milling process were investigated and the samples of ball milled powder were observed by SEM. The results indicate that the MCNT turned into nano-whiskers or nano-particles during the ball milling process. The pre-milled MCNT could be distributed in Cu powders homogeneously. The bulk MCNT / Cu nanocomposite were fabricated by hot pressing the mixed MCNT / Cu powders at a temperature of 1073 K under a pressure of 20 MPa and the microstructure of the composites were investigated. It has been found that the multi-walled carbon nanotubes distributed in copper evenly.

Investigation on the Reinforcement of Multi-Walled Carbon Nanotubes on Alumina Matrix

2006 ◽  
Vol 51 ◽  
pp. 64-67
Author(s):  
Jing Sun ◽  
Lian Gao
Keyword(s):  
Carbon Nanotubes ◽  
Bending Strength ◽  
Weight Percent ◽  
Processing Route ◽  
Matrix Composites ◽  
Alumina Matrix ◽  
Multi Walled Carbon Nanotubes ◽  
Alumina Composites ◽  
Walled Carbon Nanotubes ◽  
Monolithic Alumina

In this paper, a colloidal processing route was adopted to disperse multi-walled carbon nanotubes (MWNTs) into alumina powders homogenously. Alumina matrix composites containing 0.1 to 2 weight percent of MWNTs were successfully fabricated by pressureless sintering. Also, 1wt% MWNTs-alumina composites were prepared by hot pressing for comparison. It was found that when the sample was sintered at 1450oC, the addition of 1wt% carbon nanotubes led to 10% increase in bending strength compared with monolithic alumina. The reinforcement mechanism was discussed based on the microstructure investigation. The broken nanotubes and pullout of MWNTs at interfaces are efficient in transferring the load from the alumina matrix to the nanotubes, leading to the improvement of the mechanical properties.

Synthesis of Carbon Nanotubes Using Mesoporous Fe-MCM-41 Catalysts

2006 ◽  
Vol 6 (11) ◽  
pp. 3442-3445
Author(s):  
Jeong-Rae Ko ◽  
Wha-Seung Ahn
Keyword(s):  
Carbon Nanotubes ◽  
Mesoporous Silica ◽  
Direct Synthesis ◽  
Nano Particles ◽  
Uniform Size ◽  
Optimum Synthesis ◽  
Multi Walled Carbon Nanotubes ◽  
Synthesis Of Carbon Nanotubes ◽  
Walled Carbon Nanotubes ◽  
Mcm 41

MWNTs (multi-walled carbon nanotubes) were made by catalytic CVD process using iron-containing mesoporous silica, Fe-MCM-41, with 4 mol% Fe loading prepared by direct synthesis route. Uniform 5 nm size Fe2O3 nano-particles impregnated onto a mesoporous silica support, SBA-15 were also prepared for CNTs synthesis. The catalysts were characterized using XRD, SEM/TEM, N2 physisorption, UV-vis diffuse reflectance and FT-IR spectroscopies. Acetylene gas was introduced as a carbon source, and the gas mixture of Ar:H2:C2H2 = 14:5:1 pyrolyzed at 750 °C for 60 min was found to be the optimum synthesis condition. Fe-MCM-41 due to higher dispersion of nano-sized Fe-species was efficient as catalyst for MWNTs with more uniform size distribution. Cobalt-impregnated Fe-MCM-41 (Co/Fe = 1) produced a small fraction of SWNTs of ca. 2 nm diameter mixed with MWNTs.

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