There goes my idea for wind operated triboelectric generators using aluminium collectors then. Mind, with the amount of dust around this summer, it might still be worth a try. RP On 12 March 2015 at 00:19, RussellMc wrote: > 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 b= e > interesting. > > > _____________________ > > Their final comment may be worth noting: > > *Inaccurate information about air being "positive", etc.*-- A triboelectr= ic > series table has been circulating on the internet, and it contains variou= s > 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 i= s > blown across a wet surface, negative ions are formed due to the evaporati= on > 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 emit= ting > ions (both + and -.) This is thermal in nature, not triboelectric. > -- > http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive > View/change your membership options at > http://mailman.mit.edu/mailman/listinfo/piclist > --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .