Determination Of The Surface Area By The Bet Method-PDF Free Download

Determination of the surface area by the BET method
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Historical background, Basic principles and mathematical ideas. Measurement, BET in modern research, Conclusions, Heat exchange at the liquid He. solid metal interface, Acoustic mismatch causes weak. Ratio cl cs 0 05 3, Photons that can cross the Kapitza resistance RK 3. boundary 1 105 Q AT, I M Khalatnikov An introduction to the theory of.
Superfluidity 1965 Benjamin, S W Van Sciver Helium Cryogenics 1986 Springer. Maximizing the surface, Sintering of silver powder. Named after Stephen Brunauer P H Emmet and, Edward Teller. Developed in 1938, They were working on ammonia catalysts. First method to measure the specific surface of, finely divided and porous solids.
Applications, Pharmaceuticals, Projectile propellants. Medical implants, Adsorption, Consequence of surface energy The energy is minimized. in the bulk when every atom molecule is surrounded by. Adsorption, Physisorption determined by Temperature. Gas pressure, Interaction between, surface and gas e g. vapor pressure, Surface area, Monolayer adsorption Langmuir isotherm.
Multilayer adsorption BET theory, Sorption Isotherms. Classification after IUPAC 1984, Types II IV and VI can be measured by BET method. interaction adsorptiv adsorbent adsorptiv adsorbate. Types III V have weak interactions between gas and adsorbent. Assumptions, 1 Homogeneous surface, 2 No lateral interactions between molecules. 3 Uppermost layer is in equilibrium with vapor phase. 4 First layer Heat of adsorption, Higher layers Heat of condensation. 5 At saturation pressure the number of layers becomes. BET theory, At equlilbrium, si Surface area covered.
Ei by i layers, ai psi 1 bi si e RT p Pressure, Ei Heat of Adsorption. a b Constants, Total surface area of the sample A the total volume adsorbed. v and the volume of gas adsorbed when the entire surface is. covered with, A si v v0 isi v m v0 A, Where v0 is the volume of gas adsorbed on 1 cm2 when it is. covered by a complete unimolecular layer, BET theory. From this BET derived the, BET equation, p0 p 1 c 1 p p0.
A more convenient form is, the following, v p0 p vm c vm c p0. E ADS ECOND, c e RT E ADS ECOND, S Brunauer et al JACS 60 309 319 1938. Volumetric measurement, v p0 p v m c v m c p0, Measurement cycle to obtain equilibrium pressure and amount of. gas adsorbed, Gas N2 O2 CO2 Krypton He methane, Other methods. Single point measurement, ratio p p0 0 03, Volume of gas adsorbed vm.
Flow deflection measurement, Gravimetric measurement. BET and CNT s, Peigney et al CARBON 39 507 514 2001. First method to measure the specific surface of finely divided and porous solids Applications Pharmaceuticals Catalysts Projectile propellants Medical implants Filters Cements Adsorption Consequence of surface energy The energy is minimized in the bulk when every atom molecule is surrounded by neighbors Adsorption Physisorption determined by Temperature

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