I have try to measure the porosity of nancomposite for their application in gas sensors.
BET is better..but you can also get from XRD study as well....
Dear Tiwari,
I would recommend you to try BET for your concern. This might help you in finding the respective size distribution of pores and their volume as well.
Good luck!
As for all solids, nanocomposites or not, you can always measure bulk density by weighing the material cut in regular shape of accurately known dimensions. Then grind it very finely and measure the skeletal density of the powder by helium pycnometry. The comparison of these two densities will give you an accurate measure of the total porosity. If you need open and available porosity only, you can use mercury porosimetry, but you won't have the volume of pores narrower than a few nm, depending on the maximal pressure that the apparatus can reach (e.g. 3.7 nm at 4000 bar). Adsorption methods will give you micropore (< 2 nm) and mesopore volumes (2 - 50 nm), provided that the surface area is high enough (otherwise the uncertainty will be too high).
Alain
Hii Arnab,
I am interested in to measure the porosity by XRD. Can you tell how to do? What is the method you use?
Thank you
Dear Atli,
you may follow the link..you may also get other papers...
http://www.sciencedirect.com/science/article/pii/S0921510704006488
BET. If the porosity in nano scale, you may try with HRTEM. Some extent you may also get using PXRD.
I would also recommend BET. The XRD method proposed by Arnab Maity is also interesting.
Also you can calculate the surface area with XRD method.. just Google it.. I also got the nearly same surface area as compared to isotherm data from BET from the ceramic oxide sample....
From XRD method, this might help to finding,
1. Bulk density
2. X-ray density
But BET method,
1. Size distribution of pores
2. Surface area
3. Radius and Volume of pores.
Since, BET method (Accurately) is better than XRD method (Approximately).
- Badges
- Science topic
- Similar topics
- Physical Sciences
- Materials Science
- Materials
- Composites
- Nanocomposites