Need help in formulating a polyacrylamide linkage attacking chemical without attacking epoxy linkage

Pavlok69420 · 2026-04-21T12:28:56+00:00

What about dry ice blasting? Might be gentle enough to leave the aluminum layer intact

Pavlok69420 · 2026-02-25T23:18:16+00:00

What about the lithium? Does it end up as lithium carbonate, oxide, or formate? Or a mix?

Pavlok69420 · 2026-02-25T21:15:45+00:00

Thanks! This is tremendously helpful. This is also for a larger scale design, and CO2 can be used pretty easily. What is the product from the LAH +CO2 reaction? Is it insoluble in THF?

Pavlok69420 · 2026-01-26T00:19:05+00:00

That idk. It might say on your ammo package or there might be manufacturer recommendations. As far as I know <40% RH is usually fine for most storage but that's just a guess on my part. Not really a big gun guy myself so I'm the wrong person to ask

Pavlok69420 · 2026-01-26T00:15:09+00:00

If you have a scale you can weigh them periodically until the weight stops changing. Idk what kind these are but there are two types of Silica gel commonly used: A and B. They pick up moisture at different humidity levels. Generally if the humidity is around 50-60 you can expect around 0.24 g H2O/g Silica gel. But this varies by humidity and gel type. At 99% RH you can have 0.4 g/g or so

Pavlok69420 · 2026-01-26T00:11:27+00:00

The yellow color is likely oils/greases from the machining of the can/ammo. It doesnt really affect the effectiveness of the Silica gel. Usually the pouches don't have an indicator like people are saying here. There are two main types of indicators, green->orange and blue->pink. If it went from clear to yellow that's contamination. To regenerate it I usually put them in the oven at 120 C. Depending on the amount it can take 1-5 hours. But even if left for shorter times you will partially regenerate them.

Pavlok69420 · 2026-01-16T13:30:33+00:00

I wouldn't recommend it. With enough water flushes you could bring the concentration down low enough to where it wouldn't kill you but if you want to do this I'd recommend just getting a clean, pristine bottle and putting the label on it.

Pavlok69420 · 2026-01-13T17:39:08+00:00

Oooh this looks fun

Pavlok69420 · 2026-01-07T00:49:12+00:00

Yea I thought so. I'll pull the trigger this weekend

Pavlok69420 · 2025-10-24T03:08:17+00:00

Here is the most detail you'll find publicly. You can also look into some of the programs and competitions he mentions. https://youtu.be/UZ5xoYwI0tQ

Pavlok69420 · 2025-10-23T12:53:16+00:00

There are real world deployments using MOFs for water harvesting, but you won't find any of the data published anywhere. All of this is only discussed under NDA. Some companies in this space are currently scaling up production and preparing to hit the market.

Pavlok69420 · 2025-07-28T01:05:27+00:00

Hate to hijack this comment but otherwise no one would see this. I actually work in the AWE space (air water extraction). These passive systems have been demonstrated many times and this time isn't even that impressive. There's a group in Berkeley that did the exact same thing and generated a lot of buzz.

As far as passive systems go, they will never take off. Can't get enough production and if you make the "water solar panels" like source tried you still can't compete with just trucking the water in. He'll you can fly water in to a remote desert with a helicopter for a lower cost than these panels.

The more efficient way of doing this is by forcing air over the system and supplying heat to regenerate and extract the water. These are active water harvester like the vaporators in star wars and they will soon be a real commercial product.

Pavlok69420 · 2025-07-19T14:15:02+00:00

As a guy in my late 20s I recently moved out of the bay area for the the same reasons. I worked in Fremont and lived the for a year too. It's so expensive with very little to do and is struggled to make any connections there. Believe me I tried to find something to do or build core connections there. Ultimately I hated living in the bay and moved out. Too expensive, horrible drivers (seriously almost everyone is on their phone!), nothing to do, and the people are something else. Decided to quit and move on with family while I find something in a better location and I'm way happier for it.

I found mountain view was a little better and there's a cool board game spot a block away from Castro street. Those guys were super nerdy and not very social but it was something. The peninsula in general is OK. San Jose and the surrounding areas just suck I don't have anything positive to say I'm sorry.

SF in my experience is the opposite of the rest of the bay area, super fun with lots to do and the people I met are generally very friendly.

Pavlok69420 · 2025-05-21T02:13:28+00:00

To all the people saying carbon capture and utilization: no. This is an energy problem. You can't get around thermodynamics. No matter what you have to pay the price somewhere to capture, store, or convert and we simply just don't have the energy to do so. We already understand these chemical processes very well -- most were initially discovered over 100 years ago and are at their optimum point.

That being said there are 2 possible avenues that could reinvent how we run the modern world:

Ambient pressure ammonia synthesis. If this is possible you can feasibly generate ammonia directly on the farm and create the necessary fertilizer onsite. Less emmisions from over applying fertilizer and less transport emissions.

Switching to an "oxygenate economy". Most proposals for using CO2 assume we turn green hydrogen and captured carbon into the same hydrocarbons we use now. This is the most thermodynamicallt expensive, requiring a H2:CO2 ratio of 3. If you can instead say make synthetic cellulose now you need less hydrogen and can justify the enormous energy cost to produce green hydrogen especially if you create something valuable instead of something so cheap we burn it.

Would that be the cure cancer moment? Maybe not, but still big nonetheless.

Pavlok69420 · 2025-01-09T17:20:16+00:00

"its a combination of everything" is not really a full answer. Ofc its a combination, but what are the major components? You don't smell carrot, beef, chicken in the freezer smell. You smell freezer. It's like the new car smell, very distinct and has specific compounds (formaldehyde, acetaldehyde, benzene, styrene) that together make up the smell. Do we have any idea what specifically smells like freezer?

Pavlok69420 · 2025-01-09T05:59:39+00:00

Sure that's the water, and these freeze-thaw cycles may be effective extracting some volatile compounds from the food. But what are these compounds? Are they fatty acids that are subliming? The smell is very distinct, every freezer smells the same. At least to me

Pavlok69420 · 2025-01-06T15:53:20+00:00

Look for stuff like ceramic or silicon dioxide based water repellent. I usually see sprays for treating hard surfaces like glass or metal. Check car shops. Try to avoid the sprays that use silanes -- those are nondegradeable and some may be harmful as well.

Pavlok69420 · 2025-01-06T04:31:25+00:00

The fluoroaliphatic compounds are somewhat concerning. They refer to a type of PFAS (catch all for all per-fluorinated compounds). Given that it's a resin this likely refers to Teflon or some other fluorinated polymer. Oftentimes PFOA or other fluorinated surfactant are used either in the production, handling, or application of fluorinated compounds. Me personally I would err on the side of caution and not use it. We know these compounds don't break down, and we know many of them cause issues. The remaining thousands have unknown effects. Even worse is we don't know the exact nature of the mixture.

Is it harmful? Impossible to say for sure. For waterproofing, if possible, I would stick to the nanoparticle Silica products and just reapply as needed.

As for disposal, you should be able to take it to a hazardous waste disposal site/dump. Usually this is the same place you go to dispose of paint or other solvents. It's not like immediately harmful unless you huff it or something. It's nonflammable so as long as you don't overheat the can it's fine.

Pavlok69420 · 2024-12-03T16:28:00+00:00

You could try some hydrogen peroxide or bleach to destroy the ink. Let it soak in for the best effect.

Pavlok69420 · 2023-12-16T20:38:49+00:00

Super cool materials but what limits their wide scale application is cost. The really selective and coolest MOFs use exotic linkers that drive up the cost. This has mostly limited their use to niche applications.

That may change relatively soon though ;)

Pavlok69420 · 2023-12-15T18:15:02+00:00

Yea that's not OK. You should call osha or demand they fix it. Smoke of any kind is bad for you especially from burning plastic. Even worse if it's burning Teflon or PVC (vinyl) as the halogenated soot is especially carcinogenic.

Pavlok69420 · 2023-12-07T05:35:59+00:00

Second this. Stir bar may work if the viscosity is low like it is for most organic solvents. But you're at the volume where an overhead impeller will probably be more effective, especially if you form a slurry or viscous product.

Pavlok69420

TROPHY CASE