I did BET for my catalyst (PtCu Nano particles) when I got result, I saw this error (given in attached figure), as BET Surface area is too low, what does "fail'' mean?
is it incomplete analysis or it is another thing?
You ‘did’ BET analysis on your material? Or did someone do it for you? Obviously there are some pre-set criteria on which the result is judged. Look in the manual for what the error result means.
Dear, Professor Alan F Rawle,
Someone else has did this for me. Thanks for your suggestion.
If I read your chart correctly then the estimate of SSA is ~ 0.05 cm2/g. This means that you have an extremely small surface area and your material is not nano (needs to be > 60 m2/g).
Dear, Professor Alan F Rawle,
I asked the Teacher who is handling the BET machine, she told me that "failed"option will not effect on analysis. I am worry about that low surface area. I am working nano-particles but mostly I am getting low surface area.
Dear Anad
Have you confirmed the nano-size of your sample?
As it seems your nanoparticles are not porous, and also they may aggregate, so the BET area will be dropped. So, BET is not always the best option.
I suggest direct estimation based on average size and density and the amount of metal in your sample.
BET is more likely to suggest a nano size (< 100 nm) to the system than other conventional techniques such as DLS. This is because all the area accessible to the nitrogen molecule is accessed. Aggregation is a given for dry systems.
You haven't confirmed that my reading of your Excel spreadsheet is correct (SSA ~ 0.05 cm2/g). For 'nano' the SSA has to be greater than 60 m2/g as this will indicate a predicted size of < 100 nm (SSA = 6/D[3,2].
Dear, Professor Alan F Rawle,
It is 1.3295 m2/g.
I am sorry professor for late reply.
Anand Parkash
Far too many decimal points (even 1.33 m2/g would be considered excessive by some, but despite the vast number, your material is a long way away from being 'nano'. The averaged Sauter Mean Diameter (D[3,2]) is ~ 4.5 microns.
'The micron scale is volumetrically 109 times larger than the nanometer scale. Confusing microtechnology with molecular technology is like confusing an elephant with a ladybug' Nano: the emerging science of nanotechnology, Ed Regis, Little, Brown and Company, 1st Edition, 1995 ISBN 0-316-7358-1 pp 207-208 (quote spans 2 pages)
Dear, Professor Alan F Rawle,
Thank you very much for your kind suggestions.
- Badges
- Science topic
- Similar topics
- Chemistry
- Nanotechnology
- Nano