1. Is there any Brumauer Emmete Teller (BET) equation are available in literature for calculation of surface area.
2. How we can calculate the specific surface area of nano-particle from this equation?
If we known the size of nano particle.
From the size of the particle, you can only calculate the external surface area assuming the particles are spherical. BET is a different concept, it calculate specific surface area. Specific means, surfaces that are specific or can specifically host small molecules. These small molecuels typically lie in the range of diameter of n2 molecule and BET itself is obtained by N2 adsorption isotherms. Shortly, its impossible to obtain specific surface area using BET based on the particle size. Try to run N2 adsorption isotherm and you can use physical chemistry text book to know how to get the surface area from the BET equation...Its a simple linear equation that allows to calculate the surface area from the slope of linearized BET expression. Another issue you should be careful is the range of p/po while getting the surface area. Hope this helps.
https://en.wikipedia.org/wiki/BET_theory
you can also check the eq(1) in the above link, it explains how to get the surface area....
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