i got the results through BET analysis that with small carbon chain length surface area increases.whats the reason?.but in some literature not mention exact relation..
It is theoretically established that the pore diameter of mesoporous materials
(MCM-41) of hexagonal or cubic geometry should be equal to twice the length of the surfactant molecules, which was confirmed experimentally by you. The shorter the surfactant is, the smaller the pore size and the larger the specific surface.
thank u sir for your kind response..
but in my case pore size of MCM-41 increase when surface area increase..which is wrong..what is the reason?
It is necessary to use not the size of the surface, but the value of the specific surface. Calculate the value of the specific surface and draw a conclusion.
sir is there any refrence available for theoraticaly prove reason that pore diameter of MCM-41 should be twice of the length of surfactant?
K. Holmberg, B. Jonsson, B. Kronberg, B. Lindman, Surfactants and Polymers in Aqueous Solution, England, J.Wiley & Sons, 2003
Mostly, CTAB is used and the surface area is around 800-1000 cm3/g.
And, Yuri is right here. if you need smaller pore window, go for shorter carbon chain surfactants, and if you need larger pore window, choose larger carbon chains.
Latif Ullah
1. You write about the surface, and measure it in units of volume cm3. The surface is measured in units of cm2.
2. You write about the surface, but measure it in units of specific surface area cm2 / g.
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