. Collected reprints / Atlantic Oceanographic and Meteorological Laboratories [and] Pacific Oceanographic Laboratories. Oceanography 0 0 5 10 RELATIVE PRESSURE X=P/PL Fig. 3. Adsorption isotherms for various values of the adsorption parameter C, according to the model of Brunauer el at. (1938).. -30 -25 -20 -15 -10 TEMPERATURE CO 4. The composite dependence of surface coverage n n,„ on temperature for different values of A/: = A i —/./.. with the adsorbed layer and Pl{T) a reference pressure which is usually considered to be in equilibrium with the supercooled liquid state.
. Collected reprints / Atlantic Oceanographic and Meteorological Laboratories [and] Pacific Oceanographic Laboratories. Oceanography 0 0 5 10 RELATIVE PRESSURE X=P/PL Fig. 3. Adsorption isotherms for various values of the adsorption parameter C, according to the model of Brunauer el at. (1938).. -30 -25 -20 -15 -10 TEMPERATURE CO 4. The composite dependence of surface coverage n n,„ on temperature for different values of A/: = A i —/./.. with the adsorbed layer and Pl{T) a reference pressure which is usually considered to be in equilibrium with the supercooled liquid state. Generally, when the solid is growing, P = PS(T)+8P, (9) where Ps(T) is the equilibrium vapor pressure of the solid and 5/' the experimentally determined excess pressure. The relative pressure .V is thus a well-defined, monotonic function of temperature and, for small supersaturations, approaches unity as the melting point of the solid is approached. In the BET model the total surface concentration of adsorbed molecules is given bv nmCX ()[1 + (C-1).V] (10) where n,„ is the number of adsorption sites on the solid [cm"-], and C=C(r)=C0exp[(£,-EL)/*r] sC0exp(A£/*r) (11) is an adsorption parameter which characterizes the system. In (11) Ei is the energy binding the fiist adlaver'2 to the solid, and El the binding energy between all subsequent layers. The form of Eq. (10) is shown in Fig. 3, in which typical adsorption isotherms for various values of C are depicted. Generally, E\> El, 2 The prefix "ad" is used to imply involvement in the physical process of adsorption in an abbreviated way. Thus, "adlaver" is a layer of molecules adsorbed onto a surface and may be inter- changed with "adsorbed molecular ; Similarly, "admolecule" (used later) is an adsorbed molecule. 1295. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearan
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