Drying carbon nanotubes (CNTs) in a hot air oven instead of a vacuum oven at 100 degrees Celsius after a purification process can result in several potential issues.
Firstly, hot air ovens are not able to provide a controlled atmosphere like vacuum ovens, and this may lead to contamination from airborne particles. In contrast, vacuum ovens provide a low-pressure environment, which helps to prevent contamination from airborne particles and other impurities.
Secondly, the structural properties of the CNTs may be affected by the high temperature of the hot air oven. Carbon nanotubes are susceptible to oxidation at high temperatures and can also be damaged by exposure to air, leading to changes in their surface chemistry and properties.
Finally, the drying process may not be as effective in a hot air oven compared to a vacuum oven, as the latter can effectively remove moisture from the sample by reducing the pressure, resulting in a more thorough and consistent drying process.
In summary, it is generally recommended to dry CNTs in a vacuum oven to minimize the risk of contamination and damage to the structural and surface properties of the CNTs. However, if a vacuum oven is not available, it may be possible to dry the CNTs in a hot air oven, but care should be taken to minimize exposure to air and avoid high temperatures that may cause damage or oxidation.
as exposed by Muhammad Zohaib Safdar, the function of vaccum is to avoid oxidation by contact with air
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