3 ms·
Small Air is like 50V per mil. Cheap plastic is like double that? If the voltage of a given supercapacitor isn't high, then air could work fine I suppose. A
by dmoy 2y ago
Small
Air is like 50V per mil. Cheap plastic is like double that?
If the voltage of a given supercapacitor isn't high, then air could work fine I suppose. At least on those two dimensions, I haven't considered anything else.
Air will have less creep than most (all?) materials, but worse voltage limits.
- paulgerhardt 2y agoGlass immediately comes to mind as having less creep. If you go back to the Faraday, Hertz, Tesla et al days when they were arcing kilovolts across their labs you’ll often see them using glass insulators. Some ceramics and Teflon too.
- dmoy 2y agoMy recollection is that glass has drastically higher dialetric constant than air, but more creep (still very little creep, but more than the ~0 of air). If you're arcing kilvolts, you want that higher dialectric constant, and probably don't care about small amounts of creep. If you're building a supercapacitor, that equation might be different because the voltages can be quite small. I've been out of EE for a long time though, so maybe I'm misremembering things here.