Enthalpy of displacement of binary liquid mixtures on solid surfaces part III. Determination of the adsorption capacity from calorimetric and adsorption data

Microcalorimetric Control of Liquid Sorption on Hydrophilic/Hydrophobic Surfaces in Nonaqueous Dispersions

“…However, no statement can yet be made as to whether this layer is monomolecular or multilayered. (4) may be rewritten as [14][15][16] n σ(n) Since r* ϭ n s 1,0 /n s 2,0 , (8b, or 18 and 19).…”

“…Since x s 1 ϭ n s 1 /n s , the adsorption capacity n s can be divided into two terms with the help of the equations [14][15][16] n s 1 ϭ n s x a 1 , n s 2 ϭ n s (1 Ϫ x a 1 ) (17a) and n s 1,0 ϭ n s x a 1 ϩ r*n s (1 ϩ x a At the azeotropic point n σ(n) 1 ϭ 0; therefore, x 1 ϭ x a 1 , according to Eq.…”

“…According to Dékány et al [14][15][16] and Király and Dékány [59][60][61], these relationships, expounded according to either the adsorption layer model or the Gibbs model of adsorption excess amounts, are suitable for the exact determination of changes in exchange enthalpy observable in flowing systems and for the correct interpretation of the sorption exchange process. According to Dékány et al [14][15][16] and Király and Dékány [59][60][61], these relationships, expounded according to either the adsorption layer model or the Gibbs model of adsorption excess amounts, are suitable for the exact determination of changes in exchange enthalpy observable in flowing systems and for the correct interpretation of the sorption exchange process.…”

“…When alcohol-benzene mixtures are adsorbed on adsorbents with low surface energies, S-shaped excess isotherms are measured [15,16,[35][36][37][38]. When changes in enthalpy accompanying the adsorption displacement process are examined in these systems, the integral exchange enthalpy isotherms usually do not increase monotonously but possess a backward section.…”

“…Thus, molar adsorption enthalpies can be given for the characterization of the stabilizing adsorption layer [12][13][14][15][16]. Thus, molar adsorption enthalpies can be given for the characterization of the stabilizing adsorption layer [12][13][14][15][16].…”