I am confused between the following methods:
1) wall thickness(t)=lattice parameter (a)-(pore dia)
2) wall thickness(t)=lattice parameter (a)-0.95*(pore dia)
there is difference in values if I Compare the results from both,
which one is better?
I guess you need to use XRD instrument to get the equation for wall thickness equation.
To calculate the wall thickness, you need to have TEM images along with the gas sorption and small angle XRD results. You can measure the poresize by gas sorption and corroborate by TEM image. But you bwould be able to do so only when your sample is well ordered otherwise you would not get clear idea about the wall thickness.
Good luck.
You have to perform XRD along with gas ads-des to obtain Wt.
Wt (Wall thickness), ao (lattice parameter) and Dp (mean pore diameter)
Wt= ao-Dp.
Please see link below.
http://www.sciencedirect.com/science/article/pii/S1387181115003546
Take care! MCM-41 has a hexagonal array and the calculation is like our friends said. For MCM-48 you need to use other expressions. See ref. Schumacher et al., Langmuir 2000, 16, 4648-4654.
@Sobia Aslam - I think it is possible to calculate vectorially using chemical structure (-Si-O-Al-O-).
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