ADSORPTION AND SPREAD MONOLAYERS

Area of surface42		$A$,$A_s$,$S$
Specific surface area (= surface area per unit mass)43		$a$,$a_s$,$s$
Thickness of surface layer		${\tau}$
Superscript, indicating quantities referring to the surface layer or interfacial layer		$s$
Volume of interfacial layer		$V^s$
Subscript, indicating quantities relating to monolayer capacity		$m$
Surface coverage (= amount of adsorbed substance divided by monolayer capacity)		${\theta}$
Area per molecule in complete monolayer of substance $i$		$a_m(i)$
Superscript, indicating excess quantities referring to the Gibbs surface		${\sigma }$
Surface excess amount, Gibbs adsorption of component $i$ ( $= n_i-V^{\alpha}c_{i}^{\alpha} - V^{\beta}c_{i}^{\beta}$)		$n_{i}^{\sigma}$
Total surface excess amount (of adsorbed substance) $\left(= \Sigma_i n_i^{\sigma}\right)$		$n^{\sigma}$
Gibbs surface concentration, surface excess concentration $\left( = n_i^{\sigma}/A-s\right)$		${\Gamma}_i^{\sigma}$
Total Gibbs surface concentration, total surface excess concentration $\left(=\Sigma_i {\Gamma}_i^{\sigma}\right)$		${\Gamma}^{\sigma}$
Surface excess number of molecules (of component $i$)		$N_i^{\sigma}$
Surface excess mass (of component $i$)		$m_i^{\sigma}$
Relative adsorption of component $i$ with respect to component 1 $$\left[={\Gamma}_i^{\sigma}-{\Gamma}_1^{\sigma}\left(\frac{c_i^{\alpha}-c_i^{\beta}}{c_1^{\alpha}-c_1^{\beta}}\right)\right]$$		${\Gamma}_i^{(1)}$, ${\Gamma}_{i,1}$
Reduced adsorption (of component $i$) $$\left[={\Gamma}_i^{\sigma}-{\Gamma}^{\sigma}\left(\frac{c_i^{\alpha}-c_i^{\beta}}{c^{\alpha}-c^{\beta}}\right)\right]$$		${\Gamma}_i^{(n)}$
Total concentration in phase ${\alpha}$ $\left( = \Sigma_i c_i^{\alpha}\right)$		$c^{\alpha}$
Area per molecule in surface$^{37,38}$		$a_i$,$a_{i,s}$
Co-area per molecule in surface$^{37}$		$a_i^0$,$a_{i,s}^0$
Gibbs surface concentration (for solid/liquid systems) of component $i$, relative to a reference system with the same number of moles (reduced adsorption)		${\Gamma}_i^{(n)}$
( $=A_s^{-1}\left[n_i-n^lx_i^l\right]$)
Relative adsorption (for solid/liquid systems)		${\Gamma}_i^{(1)}$
( $=A_s^{-1}\left[n_i-n^lx_i^l/x_1^l\right]={\Gamma}_i^{(n)}/x_1^l$ for binary system)
Gibbs surface concentration (for solid/liquid systems) of component $i$, relative to a reference system with the same volume of liquid ( $=A_s^{-1}\left[n_i-c_i^lV^l\right]$)		${\Gamma}_i^{(v)}$
Surface excess volume of gas calculated for 273.15 K and 101.325 kPa (0 and 1 atm)		$V_i^{\sigma}$
Amount of adsorbed component $i$ (= amount of component $i$ in the interfacial layer)		$n_i^s$
Total amount of adsorbed substance $\left( = \Sigma_i n_i^s\right)$		$n^s$
Monolayer capacity expressed as amount of substance		$n_m^s$
Monolayer capacity expressed in volume of gas calculated for 273.15 K and 101.325 kPa		$V_m$