I am synthesizing {001} facets films on Ti-Sheets by hydrothermal route. Can anyone please tell me how to BET of my prepared samples?
Gas adsorption is used to measure the BET surface area using gases such as nitrogen or krypton. The BET transform calculation is done in commercially available software over a relative pressure range of 0.05 < P/Po < 0.3 for most materials. The pressure is relative to the saturation pressure at liquid nitrogen temperature (77.3K). Optimizing the temperature and time for the preparation of the sample for analysis (degas) will be the challenge. Please let me know if you have any further questions or need help setting up an analysis. Thanks.
- Andrew
Please have a look at this wikipedia link: http://en.wikipedia.org/wiki/BET_theory
After doing BET runs in the range Andrew mentioned above, you can plot 1/(v(p/p0-1)) vs. p/p0. Slope and Y-axis intercept of this plot will give you the amount of gas adsorbed on the monolayer (vm). Then by using the cross-sectional area of adsorbent gas and Avogadro number, vm is converted into surface area of the sample.
I suggest the method suggested by Mohamamd Rafati.
From value of the amount of gas adsorbed on the monolayer (vm), Avagadro nymber and geometrical area, we can calculate roughness factor
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