For those who want to make it: 1. You need a kiln heated to 800-850 C (you have to play with temperature 2. You need a mould (iron or stainless, quarz pipe pease wolud wirk, but never tried 3. Glass shall be ground on a ball mill and seived to size, depending on the porousity you want to get. 4. Put the frit to the mould and compact it (with beaker bottom or something. 5. Put the mould with the fritt to the heated oven for 5-7 minutes, but you have to play with time a lot to get good result. 6. Take mould out and cool on the table, remove glass when it is still hot. You may use some talc to make tge mold less sticky to glass
Just use two metal plates to form uniformly thin layer and baking. and both sides will be same. You can heat metal plates with torch at the end of baking to melt surface a bit exactly under metal plates.
In that case I would just suggest to put some weight on top of glass during baking to get more uniform fusing Or just buy big one and carefully file it to shape, which you may need to do anyway..
@@IlusysSystems Porous frits are hard to find here in Mexico unless bought by international shipping. I tried a desktop ball mill, but I think I used some too small bearings and ended with glass dust.
@@Ottmar555 just realized, that if you want to just make permeable membrane, try shower curtains. I tested them, they can pass a lot of current, and are decently inert and would be easier to clean unless you contaminate them with organic solvents. Even then could be fine.
@@IlusysSystems For electrode applications you need to form a liquid-liquid junction. Enough mass transfer for it to be responsive, but not fast enough for it to deplete the internal solution too quickly. I don't think you'd need a lot of current, but it is an interesting option. Thank you for the suggestion. For such a cheap material, changing between runs wouldn't be a problem. So the only consideration would be designing a removable membrane in the glass electrode. If I recall, most shower curtains here are made of PVC, is the material the same in the ones you tried? What did you use them for?
@@Ottmar555 Not sure if what I had was PVC or polyester. I wanted to use them as membrane in HHO to separate oxygen and hydrogen, but I decided not to do it. I don't know anything about how PH electrodes work, so I am just shooting in the air hoping to hit something :)
Obvioulsy this neesd some experimentation to get consistent results. But with consistent source material I would say that 2 variables are time and pressure. Temperature should be at sweetspot.
It's not as easy as it sounds... I tried doing it by cooling glass very quickly, Issue is, that I don't have big enough equipment to heat kg of glass to high enough temperature.
Honestly I never saw that before, really cool idea of project
For those who want to make it:
1. You need a kiln heated to 800-850 C (you have to play with temperature
2. You need a mould (iron or stainless, quarz pipe pease wolud wirk, but never tried
3. Glass shall be ground on a ball mill and seived to size, depending on the porousity you want to get.
4. Put the frit to the mould and compact it (with beaker bottom or something.
5. Put the mould with the fritt to the heated oven for 5-7 minutes, but you have to play with time a lot to get good result.
6. Take mould out and cool on the table, remove glass when it is still hot.
You may use some talc to make tge mold less sticky to glass
Just use two metal plates to form uniformly thin layer and baking. and both sides will be same. You can heat metal plates with torch at the end of baking to melt surface a bit exactly under metal plates.
"I tried to make them some before they arrived." I can relate
Thank you! This is exactly what I needed to do some custom pH electrodes.
In that case I would just suggest to put some weight on top of glass during baking to get more uniform fusing
Or just buy big one and carefully file it to shape, which you may need to do anyway..
@@IlusysSystems Porous frits are hard to find here in Mexico unless bought by international shipping. I tried a desktop ball mill, but I think I used some too small bearings and ended with glass dust.
@@Ottmar555 just realized, that if you want to just make permeable membrane, try shower curtains. I tested them, they can pass a lot of current, and are decently inert and would be easier to clean unless you contaminate them with organic solvents. Even then could be fine.
@@IlusysSystems For electrode applications you need to form a liquid-liquid junction. Enough mass transfer for it to be responsive, but not fast enough for it to deplete the internal solution too quickly. I don't think you'd need a lot of current, but it is an interesting option. Thank you for the suggestion. For such a cheap material, changing between runs wouldn't be a problem. So the only consideration would be designing a removable membrane in the glass electrode. If I recall, most shower curtains here are made of PVC, is the material the same in the ones you tried? What did you use them for?
@@Ottmar555 Not sure if what I had was PVC or polyester. I wanted to use them as membrane in HHO to separate oxygen and hydrogen, but I decided not to do it.
I don't know anything about how PH electrodes work, so I am just shooting in the air hoping to hit something :)
That was awesome!
Are you making a bong or actual science experiments?
What if instead of using the torch to reheat the topside loose material you tried baking it with a second graphite plate on top of the material?
Would probably work, but haven't tried
Yes, you right. It's a suck-ccess :)
If you aren't spying on me thru my webcam buddy then how did you know I was cringing?
What flame source would you suggest, and would it be possible to make this without a mill?
I used just mortar and pestle so on very small scale sure, or as I said in video, use rapid cooling to powderize glass.
Ah flame source.. Hmmm you mean for furnace? I am using resistive heating elements, otherwise I use 1-2kW HHO + propane/butane for melting glass
And what should i do if i want to make grade 4 (5 to 15) microns porosity
Obvioulsy this neesd some experimentation to get consistent results. But with consistent source material I would say that 2 variables are time and pressure. Temperature should be at sweetspot.
Why couldnt you just make ruperts drops and break them in water then drain water…. You get dust…. Easy and quick…
It's not as easy as it sounds... I tried doing it by cooling glass very quickly, Issue is, that I don't have big enough equipment to heat kg of glass to high enough temperature.