Full factorial design approach to carbon nanotubes synthesis by CVD method in argon environment
| Autor: | I. A. Mohammed, O.K. Abubakre, M. T. Bankole, Ayo Samuel Afolabi, Ambali Saka Abdulkareem, S. S. Ochigbo |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Materials science
Filtration and Separation Nanotechnology 02 engineering and technology Chemical vapor deposition Carbon nanotube 010402 general chemistry 01 natural sciences Catalysis Education law.invention chemistry.chemical_compound law lcsh:Chemical engineering Fluid Flow and Transfer Processes Process Chemistry and Technology Thermal decomposition lcsh:TP155-156 Factorial experiment 021001 nanoscience & nanotechnology 0104 chemical sciences Volumetric flow rate Acetylene chemistry Chemical engineering Yield (chemistry) 0210 nano-technology Energy (miscellaneous) |
| Zdroj: | South African Journal of Chemical Engineering, Vol 24, Iss, Pp 17-42 (2017) |
| ISSN: | 1026-9185 |
| DOI: | 10.1016/j.sajce.2017.06.001 |
| Popis: | Whereas meeting product quantity and quality are prime intent in process optimization of materials manufacturing, the application of the more reliable full factorial experiment has not been well-explored in optimization studies of Carbon nanotubes (CNTs) synthesis. In this study, statistical full factorial design of experiment was explored in the parametric studies of CNTs synthesis via acetylene-chemical vapour deposition (CVD). Bimetallic (Feî¸Co) catalyst supported on CaCO3 was employed for the synthesis of CNTs. The dependence of CNTs yield on the growth time (45/60 min), growth temperature (700/750 °C), acetylene flow rate (150/190 ml/min), and argon flow rate (230/290 ml/min) was investigated in the 24 factorial design of experiment. The growth temperature and acetylene flow rate were found to have the most significant effects on the yield of CNTs, and a maximum yield of 170% was obtained at growth conditions of 60 min, 700 °C, 190 ml/min acetylene flow rate, and 230 ml/min argon flow rate. Since acetylene undergoes polymerization or dissolution during non-catalyzed thermal decomposition, the significant effects of temperature and acetylene flow rate as illustrated by the factorial analysis suggests that the selective ability of the Feî¸Co/CaCO3 catalyst towards CNTs growth in the thermal decomposition of acetylene in CVD was mainly thermodynamics-controlled. Characterization of CNTs samples synthesized at different conditions shows that highest-yield conditions do not guarantee best quality properties. Keywords: Optimization, Full factorial design, Carbon nanotubes, Chemical vapour deposition |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|