Can leather be used for a Van de Graaff generator's bottom roller?

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Leather is being considered for the bottom roller of a Van de Graaff generator due to its high position on the triboelectric scale, with initial tests indicating that the soft, fuzzy side is more effective. The discussion also touches on the charge dynamics, clarifying that using leather on the bottom roller and PVC on the top can allow for either a negative or positive charge on the dome, depending on the design. Participants recommend further research on DIY Van de Graaff construction for additional insights. The importance of the leather's rough side being outward is emphasized for optimal performance. Overall, the choice of materials and their arrangement is crucial for achieving the desired electrical charge.
Fischer777
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Hello everyone. I am trying to build a Van de Graaff generator for a project of mine (the triboelectric kind), and I have heard that leather is very high on the triboelectric scale, so I plan on using it for the bottom roller. However, I am not sure if this is referring to the smooth, tanned side of the leather, or the 'fuzzy' soft side. My initial tests conclude that it is the soft side, but I want to make sure.

Also, if I use leather on the bottom roller and PVC for the top, will the dome take on a negative charge? I was under the impression that it would, but after doing some research, I'm not sure anymore.
 
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Yes, rough side out on the leather belt.

You can design it to make the top negative or positively charged.

I suggest searching for "DIY Van de Graaff" for more construction tips.
 
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