Читать книгу Carbon Nanofibers - Группа авторов - Страница 85

This is a well-known reaction used to fabricate new compounds and structures. Once started, the reaction continues with the help of the energy provided by itself rather than from outside the system. CNF is synthesized by this method, where the exothermic reaction between aluminum and iron oxide is used for preparing the heat required for SHS. In addition, the iron produced from the reaction can play the role of catalyst for growing the CNFs from activated carbon. Once the process starts, the reaction continues with the help of the energy provided by itself rather than from outside the system. Rapid solidification of products in CS creates nanostructures that would be otherwise difficult to make. Carboniferous materials (soda, limestone, and Teflon) are used along with reducers (magnesium, lithium, and sodium) with the addition of a nickel or iron as a catalyst. The yield of CNTs has shown to be weakly sensitive to the amount of catalyst. They have also found that the carbon source is an important factor: carbonaceous materials which were used required energy to decompose and to take part in the formation of nanostructures, which implies that there are no diluents in the reaction. These conditions cause agglomeration and condensation of the materials, preventing the formation of carbon nanostructures. A simple reaction called a thermite reaction is used to produce CNTs and CNFs in just one step.