Supercritical drying chamber for aerogel production--- make money online

  

I built a pressure chamber from 2" pipe fittings and 1/8" brass valves to contain supercritical CO2 for drying applications. One project is to try aerogel production which generally requires that solvent be removed via

supercritical drying.  Normal evaporation would deform the aerogel structure as the surface tension of the solvent pulls the gel's structure tighter together and makes it dense.  Since supercritical fluids have gaseous properties, they can diffuse out through the gel without affecting the structure the way that a liquid would.

hey everyone I finally got some

chemicals to make aerogel and so in

preparation I built this supercritical

drying chamber so let me show you how

it's built okay here we have a 20-pound

co2 cylinder and it says siphon on there

which means that inside the tank there's

a tube that goes all the way to the

bottom so when I open the valve I get

liquid co2 out the output out without

the the valve as opposed to just gas and

there's no regulator that's just a tee

with a gauge on it and the liquid co2

flows through that copper pipe tube

rather and into the chamber there so the

chamber is really just a two inch steel

pipe fitting and I've got some smaller

fittings eighth inch fittings for valves

on there now by opening this valve over

here the far valve and this one the

chamber will fill with liquid so this

valve lets out the gas that's in the

chamber and this valve lets in the

liquid the valve on the bottom is for

draining the liquid so when this thing

is actually used to create a row gel

what's going to happen is we're going to

drain solvent out at the bottom so the

aerogel is going to be saturated with

methanol and this will drain the liquid

co2 methanol mix out of the chamber so

I'll do a video on actually making the

aerogel later but I thought I'd just

show you this putting it together was

pretty straightforward it did leak a

fair bit so I had to use lots of teflon

tape I don't think it's leaking now I

went around it with a tube this is a

really good way to check for leaks and

just listen for them with a tube like

this and it seems pretty much fine so

I'm going to leave it full of liquid co2

and come back in a few days or a week

and see how it's doing the pressure

gauge on a co2 system is not very

indicative of how much get a liquid or

gas is in the tank it's actually only an

indicator of the outside air temperature

so inside the tank there's a mixture of

liquid and gas and it'll that the

pressure will lead the same for a given

outside temperature regardless of how

much liquid is actually in the tank so

it's reading about 750

psi which correlates to a temperature

out here probably about 70 degrees F or

something like that and it'll stay 750

psi if the temperature stays the same as

I draw down the liquid out of that tank

so as you can see I've been stocking up

on all kinds of nice lab wear goodies

and hopefully in my next video I'll

actually be mixing the stuff up and

doing the first step of aerogel the

whole process takes about a week but are

a few days depending on the size of the

gel since it takes time for the solvent

to diffuse out of the gel but hopefully

I'll have a video just showing the start

of it or maybe I'll wait till the end

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