They're just contrails, youre crazy!
(media.scored.co)
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Aluminum oxide nanoparticle fuel additive. Minimizes the number of people who need to be aware of it.
At the concentrations needed for cloud seeding (let alone mass mental retardation), adding something as abrasive as aluminum oxide to fuel would destroy fuel pumps and engines before they even got off the ground. It's a polishing agent FFS, and generally insoluble in like... anything. You either buy it in powder or in a pasty suspension.
So if they are adding it, it's not in the fuel mix.
We're talking about aluminum, not lead.
Let's do some back-of-the-envelope calcs. We'll say 100 grams of seeding material per spread, a Boeing 737 holds about 20k liters of fuel. So 5 mg per liter.
Dispersing and then keeping the particles suspended would be more of the issue, but there's been a fair amount of research into using metal oxides as fuel additives for other reasons. You would need the right surfactant to make it work, but it's feasible.
Metal-oxide buildup in the engine would be another concern, but the polishing effect should be basically non-existent.
I don't know if the government (or some other org) is engaging in large-scale cloud seeding utilizing commercial airliners or not. But that is how I would try to accomplish it if I were wearing a black-hat, and it seems technically feasible.
I was using the term "mental retardation" in a more literal sense vis a vis a literal slowing of the mind, a dampening of the intellect. Which is the chemtrails conspiracy generally (mind control of sorts), and honestly what I (mistakenly) thought you were alluding to with the "people who need to be aware of it" remark. Cloud seeding is a more recent addition.
I have no idea where you got that number, but first, a quick Google on the silver iodide (preferred cloud seeding material) required on a typical seeding run is 25-100kg, or 25-1000x what your estimate is. Give that AgNO3 is 234g/mol and Al2O3 is ~102g/mol, you get the same number of Al2O3 particles at about 1/2 the mass expense, so 12.5-500x your estimate for the same effect. Either way, adding kilograms of effectively-pulverized-sand absolutely introduces the polishing effect.
Second, even if 100g per run in a 737 means 100g dispersed over some 3,000+ miles, so 33mg/mile at best, which comes to about 6 micrograms per linear foot. If that's cloud-seeding density, I should be kicking up thunderstorms every time I polish my tailpipe. No, that's not a euphemism.
You talk about surfactants... that's on the right track, but you were a little closer with the nanoparticle idea. If you conjugated the Al2O3 with a soluble chelating agent or packaged it in a more soluble nanoparticle, it could protect it and the engine parts through combustion. At which point, maybe the nanoparticle shell degrades in the high temps of the jet engine exhaust, exposing the Al2O3. It would be a pretty cool chemistry achievement honestly.
But you'd probably be better off working with some other cloud seeding agent.
If they added it to the fuel, it would leave "chemtrails" across the entire trip, not just specific areas. That seems counter-productive to controlling rain patterns or dousing civilians with chemicals.
They're produced by heating the cold air, causing the condensation to appear when the air immediately cools back down. They come off wingtips of fast aircraft when they turn or dive, and also when the sound barrier is broken too. They're abundant in WW2 pictures. Were those caused by "Aluminum Oxide nanoparticles too?
Just sayin. It's similar to steam from a boiling kettle.
Do you think fuel is not tested by anyone?
We just chuck it in planes and hope for the best?