I have few mg of powder and I would like to know the surface area and porosity. However is not enough for BET measurements. Which is a reliable alternative technique?
I agree with Prakash that BET is the best way to determine both aspects you need.
I have an aerogel made of metal oxide. I think I have no more than 50mg (probably even less, it has a very low density). A very bad situation! anyway thank you both for your fast answers. Can you suggest me an experimental procedure that I can apply? Unfortunately I do not have on my side a BET expert.
Regards,
Arianna
@Adriana but you can do it with 50 mg of sample, no problem. For Nitrogen Isotherms you need only 50 mg and that technique in no destructive for your sample (you can recover it). You need a physisorption analyzer (like ASAP 2020).
I'd like to say: just try ! 50 mg can be enough, provided that the pore size is narrow enough, thus leading to a high (therefore accurate) adsorbed amount. But if the pore size is very wide, the surface area will be low, so there will be no accuracy. Aerogels generally have surface areas of several hundreds of m2/g, typically 300 - 700 m2/g. For an average of 500 m2/g, this means that you'll have to measure 25 m2. This won't be very quite accurate, but possible. Hence the need to try !
Alain
- Badges
- Science topic
- Similar topics
- Chemistry
- Nanotechnology