𝔖 Bobbio Scriptorium
✦   LIBER   ✦

Comments on a paper by P. Nikitas: “on the derivation of the state equation in models of adsorption from solution” and some nuances of adsorption modelling

✍ Scribed by Marian Karolczak

Publisher
Elsevier Science
Year
1989
Tongue
English
Weight
716 KB
Volume
34
Category
Article
ISSN
0013-4686

No coin nor oath required. For personal study only.

✦ Synopsis

Abstrad-It has been shown that the equation of state for adsorption from solution presented by Nikitas [Electrochim. Acto 32, 1279 (1987)] has, in fact, been derived before in the literature [Karolnak and Mohilner, J. phys. Chem. 86, 2840 (1982)]. Some inconsistencies and pitfalls in the Nikitas derivation are indicated. The nuance8 in the adsorption modelling are also discussed. Particularly, it has been shown that the postulate of non-compressibility is inherent in the derivation of surface equation of state. The role and significance of two additional basic postulates: the surface displacement reaction and the constant thickness of the interfacial layer (including the concept of monolayer adsorption) have been treated as well. The derivation of the general surface equation of state has been presented. I have recently become aware of the publication[ 1] by P. Nikitas. This publication, especially in the part entitled, "Thermodynamic Equations", contains several highly misleading references and statements and at least one important error. First, the author arbitrarily distinguishes some chemical potential ,u (cf: definition of this quantity in the nomenclature); he later concludes that ". . . cc, is not a surface chemical potential, but only the term which' expresses the concentration dependence of the chemical potential of component i." Next he writes two equations [Equations (4) and (S)]: p,, -rp, = 1: -r&, Equation (4) of [l] x"" dp,, + (1 -~5) dir, = 0, Equation (5) of Cl] and claims that 'I. . . equation (5) is valid in BDM and

📜 SIMILAR VOLUMES

On the derivation of the state equation
On the derivation of the state equation in models of adsorption from solution
✍ P. Nikitas 📂 Article 📅 1987 🏛 Elsevier Science 🌐 English ⚖ 398 KB

A new procedure for the derivation of the equation of state in models of adsorption from solution is developed. Based on thermodynamics a simple relation between the surface pressure and the chemical potential of one reference solvent state is established, making the calculation of the state equatio

Some comments on the paper ‘On the Measu
Some comments on the paper ‘On the Measurement of Preferences in the Analytic Hierarchy Process’ by A. A. Salo and R. P. Hämäläinen
✍ H. A. Donegan 📂 Article 📅 1997 🏛 John Wiley and Sons 🌐 English ⚖ 148 KB 👁 2 views

used to derive a partial preference ordering. For two recent methods see Salo and HaÈ maÈ laÈ inen (1992, 1995) and for an overview see Weber (1987). From empirical research we know that subjects are prone to biases. In addition, as pointed out by the authors, verbal expressions used in the AHP migh

Studies on pharmaceutical powders and th
Studies on pharmaceutical powders and the state of subdivision. II. Surface area measurements of some pharmaceutical powders by the low-temperature nitrogen adsorption isotherm technique*,††This paper is based in part on a thesis submitted by Joseph V. Swintosky to the Graduate School of the University of Wisconsin in partial fulfillment of the requirements for the degree of Doctor of Philoshy.
✍ Swintosky, J.V. ;Riegelman, S. ;Higuchi, T. ;Busse, L.W. 📂 Article 📅 1949 🏛 Elsevier ⚖ 424 KB 👁 1 views
Studies on pharmaceutical powders and th
Studies on pharmaceutical powders and the state of subdivision. I. The application of low-temperature nitrogen adsorption isotherms to the determination of surface areas*,††This paper is based in part on a thesis submitted by Joseph V. Swintosky to the Graduate School of the University of Wisconsin in partial fulfullment of the requirements for the degree of Doctor of Philosophy.
✍ Swintosky, J.V. ;Riegelman, S. ;Higuchi, T. ;Busse, L.W. 📂 Article 📅 1949 🏛 Elsevier ⚖ 544 KB