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Billions of gallons of water are used per year cleaning off solar panels.
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A nanometer scale coating of titanium dioxide would make the panels oleophobic:
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Nano titanium dioxide for coating (Nano TiO2), oleophilic ...
https://hiyka.com › product › nano-titanium-dioxide-for-coating-nano-tio2-oleophilic
Nano titanium dioxide for coating (nano TiO2 for coating) a white loose powder, mainly composed of nano-titanium dioxide, rutile or anatase crystal, with significant photocatalytic antibacterial, photocatalytic degradation of formaldehyde, benzene, ammonia and other harmful gases, with anti-fouling, UV shielding effect.This product is non-toxic and harmless, and has excellent compatibility ...
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Anyways I dropped in to post his:
50W/sq meter from capturing the triboelectric charge; about a third the output of a square meter of photovoltaic solar.