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Old Yesterday, 07:35 AM   #961
kazap is offline kazap  Australia
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Quote:
Originally Posted by MJ Dijkstra View Post
..... In case of an aircapacitor this is neglegible. ...

Would you care to explain?
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Old Yesterday, 08:16 AM   #962
MJ Dijkstra is online now MJ Dijkstra  Netherlands
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Originally Posted by kazap View Post
Would you care to explain?
Roughening the surfaces of a pair of parallel plates does only causes a small variation in the minimum distance the pairs of charges can approach — it is insignificant compared to the large distance between the plates. (unless in case of a megathick graphite coating LOL) The dielectric follows a smooth average line at the boundary.
A higher surface area does work in ultracapacitors as well as in electrolytic capacitors, but not in aircapacitors.
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Last edited by MJ Dijkstra; Yesterday at 08:20 AM.
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Old Yesterday, 01:34 PM   #963
wout31 is offline wout31
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Quote:
Originally Posted by gentlevoice View Post
Hi all,
This is a bit off-topic but nevertheless ... I sense that the "tone of voice" in this otherwise very interesting thread (IMO) tends to get somewhat harsh.
Personally I find this to be a pity because I reckon that we all have an interest in this subject - and I think that positive collaboration is supportive of good innovation and ideas - and also because I personally always see people next to the ideas, not just ideas.
And IMHO it is just much more pleasant to exchange positively ...
Felt like saying this.
Jesper
I couldn't agree more. If I contributed or provoked the harshness I sincerely apologize. As you look back on this thread you see that at one point I censored/removed a reply. I was about about to say the same as you are saying now. A bit later I said goodnight and goodbye because I was fed up with kind remarks that we're posted. I came here to learn and share not to be insulted and laughed at. I must say that the culture of the Dutch is more blunt than other cultures, but definitely not like this (I hope). Off-topic? No. Very much to the point.
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Old Yesterday, 01:46 PM   #964
alexberg is offline alexberg
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Quote:
Originally Posted by kazap View Post
As you point out surface area is pivotal to charge density. An irregular surface increases surface area of the membrane at the micron level. Viola. Potential for increased charge density.
C=eps*eps0*S/d, where eps is permittivity, eps0 vacuum(air) permittivity, S-area, d-distance between plates. Charge is related to the voltage at a given capacitance U=Q/C.
Having hair like structure will not help, unlike lytic capacitors where contact is provided by electrolyte and porous electrode is of a definite advantage.

Last edited by alexberg; Yesterday at 01:54 PM.
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Old Yesterday, 03:55 PM   #965
gentlevoice is online now gentlevoice  Denmark
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ESL Diaphragm coating
Quote:
Hi all,
This is a bit off-topic but nevertheless ... I sense that the "tone of voice" in this otherwise very interesting thread (IMO) tends to get somewhat harsh.
Personally I find this to be a pity because I reckon that we all have an interest in this subject - and I think that positive collaboration is supportive of good innovation and ideas - and also because I personally always see people next to the ideas, not just ideas.
And IMHO it is just much more pleasant to exchange positively ...
Felt like saying this.
Jesper
Hi again ... I would like to emphasize that with the above comment I do not point at anyone in particular ... I see it more as an "invitation" - if I can use this word - to smile at eachother when posting ...

Wishing you a pleasant weekend ...

Cheers,

Jesper
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