Synthesis and Characterisation of Carbon Nanomaterial on Short Carbon Fiber by Fluidized Bed Chemical Vapour Deposition and Fabrication of Carbon Nanocomposite
Although there are some researches on the whiskerization of CNPs on carbon fiber, but none has studied it in the fluidized bed. This research has carried out to study the whiskerization of carbon nanoparticles on short carbon fiber by fluidized bed reactor chemical vapour deposition (FBCVD). The...
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| Format: | Thesis |
| Language: | English English |
| Published: |
2009
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| Online Access: | http://psasir.upm.edu.my/id/eprint/7844/1/ABS_%3D%3D%3D_FK_2009_96.pdf |
| Summary: | Although there are some researches on the whiskerization of CNPs on carbon fiber,
but none has studied it in the fluidized bed. This research has carried out to study the
whiskerization of carbon nanoparticles on short carbon fiber by fluidized bed reactor
chemical vapour deposition (FBCVD). The CNP whiskerized CF was added by
appropriate amount of Polypropylene to make a composite. Some information about
catalyst, nanostructural features of nanoparticles and composite discussed. Hence, in
this work, experimental studies were carried out to elucidate the influential
parameters and investigate the influence of (i) synthesis temperature, (ii) catalyst type
(iii) carbon source gas flow rate on CNP quality in FBCVD process. The synthesis of
carbon nanoparticles (CNPs) have been done by the catalytic decomposition of
acetylene over Fe/CF catalysts in a fluidized bed reactor. The general growing
conditions were: 40 L/min flow rate, 450-650°C synthesis temperature, atmospheric
pressure and three gas compositions: 50% , 25% and 25% C2H2/H2/N2. The catalyst
substrate was carbon fiber with different sizes (1mm and 2mm) and metal catalyst
with different content of iron (0.23%, 1.8% and 4.92%) were used to deposit on the
CF surface. Characterization of the catalysts and the products was performed by X ray diffraction patterns (XRD), scanning electron microscope (SEM) and thermal
gravimetric analysis (TGA). An apparent relationship was found to exist between the
metallic iron content of the catalysts, substrate size, and the final characteristics of the
carbon products. Then the composite was prepared with the best percentage of
whiskerized carbon fiber and polypropylene with concentration of 2% and 98%
respectively. The mixture introduced into the mixer (The rotor speed and temperature
were set at 120 rpm and 180oC, and mixing continued for 10 min). Finally the
composite was analyzed by Dynamic Mechanical Analysis (DMA) for mechanical
properties. This study indicates that the optimum condition for the growth of CNP on
CF is 600 °C for 1.8% Fe on carbon fiber with 2mm length for a 30 minutes
deposition time and 15L/min acetylene flow rate. |
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