Better-than-some list of materials and potentials for generating
trioboelectric potentials (potentially).

     http://www.trifield.com/content/tribo-electric-series/

Polyurethane foam on Teflon looks worth trying!

But eg "box sealing tape" + UHMWPE or PVC is scarily 'good'

Droplets of falling 'machine oil' "splattering off a Teflon surface may be
interesting.


_____________________

Their final comment may be worth noting:

*Inaccurate information about air being "positive", etc.*-- A triboelectric
series table has been circulating on the internet, and it contains various
inaccuracies. Though attribution is rarely given, it appears to be mostly
from a 1987 book. It lists air as the most positive of all materials,
polyurethane as highly negative, and various metals being positive or
negative, apparently based on their known chemical electron affinities,
rather than on electrostatic experiments. (From actual tests, there is
little or no measurable difference in charge affinity between different
types of metal, possibly because the fast motion of conduction electrons
cancels such differences.) In gaseous form, air is generally unable to
impart any charge to or from solids, even at very high pressure or speed.
If chilled to a solid or liquid, air is expected to be slightly negative,
not positive. There are three cases where air can charge matter (in the
absence of external high voltage). 1. If contaminated by dust, high-speed
air can charge surfaces, but this charge comes from contact with the dust,
not the air. The charge polarity depends on the type of dust. 2. If air is
blown across a wet surface, negative ions are formed due to the evaporation
of water. In this case, the wet surface charges positive, so the air
becomes negative. 3. If air is hot (above about 1000=B0C), it begins emitti=
ng
ions (both + and -.) This is thermal in nature, not triboelectric.
--=20
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