Dear friend Arisa Ueda

There are several methods for extracting modified CNTs in powder form, depending on the specific modification and the desired final properties of the powder. Here are some general steps that can be followed:

Note that CNTs may tend to form aggregates or bundles, which can affect the final properties of the powder. To avoid this, it may be necessary to use a surfactant or other dispersant during the dispersion and filtration steps. Additionally, the use of centrifugation may help to further separate and isolate the CNTs, but it may not necessarily result in a powder form.

Dear friend Kaushik Shandilya

Thank you very much.We have an additional question.

When CNT is filtered, I think it sticks to the filter paper as a sheet, but after it is peeled off from the filter paper, does it crumble into a powder?

In my image, the CNTs stuck to the filter paper are entangled, and I am worried that if I try to break them up with a spatula, I may damage the CNTs and destroy them.

Is such a thing possible?

I would be very happy if you could answer my question.

Thank you.

When CNTs are centrifuged, they tend to form aggregates and sheets due to their tendency to bundle together. However, it is possible to obtain purified CNTs in powder form by using a surfactant-assisted dispersion method.

In this method, a surfactant is added to the solution containing the CNTs before centrifugation. The surfactant helps to disperse the CNTs and prevent them from aggregating. After centrifugation, the CNTs can be collected and washed with a solvent to remove the surfactant.

Once the surfactant is removed, the CNTs can be dried to obtain them in powder form. It is important to note that the drying process should be done carefully to avoid damaging the CNTs. One common method is to use a vacuum oven to slowly dry the CNTs at a low temperature.

Overall, while centrifugation can lead to the formation of CNT sheets, a surfactant-assisted dispersion method can help to obtain purified CNTs in powder form.